Relevant bibliographies by topics / Oxyde de cobalt

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Oxyde de cobalt'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Oxyde de cobalt"

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Ved, M. V. "Functional mixed cobalt and aluminum oxide coatings for environmental safety." Functional materials 24, no. 2 (June 22, 2017): 005–310. http://dx.doi.org/10.15407/fm24.02.303.

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Mammadyarova, S. J. "SYNTHESIS AND CHARACTERIZATION OF COBALT OXIDE NANOSTRUCTURES. A BRIEF REVIEW." Azerbaijan Chemical Journal, no. 2 (June 29, 2021): 80–93. http://dx.doi.org/10.32737/0005-2531-2021-2-80-93.

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The newest achievement in the synthesis of cobalt oxide nanoparticles are considered. Cobalt oxide nanoparticles have attracted a great attention due to their uncommon properties and application in a supercapacitor, optoelectronic device, Li-ion battery gas sensor and electrochromic devices. Recently, nanostructured transition metal oxides with valuable properties have become a new class of materials for many technological fields. Cobalt oxide nanoparticles obtained from various precursors show different size distribution as well as different optical, electrical, magnetic, and electrochemical properties. A reduction in particle size to nanometer-scale leads to changes in properties compared to bulk ones due to quantum size effects. Depending on the application area, the choice of an appropriate synthesis method for nanoparticles with desirable properties is a crucial factor. This work aims to provide additional information on the synthesis methods and properties of cobalt oxide nanoparticles
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Chansaengsri, Kasidid, Korakot Onlaor, Thutiyaporn Thiwawong, and Benchapol Tunhoo. "Supercapacitive Properties of Cobalt Oxide Thin Films Prepared by Electrostatic Spray Deposition Technique at Different Substrate Temperature." Key Engineering Materials 675-676 (January 2016): 261–64. http://dx.doi.org/10.4028/www.scientific.net/kem.675-676.261.

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In this work, cobalt oxide thin films were prepared by electrostatic spray deposition (ESD) technique. The influence of the substrate temperatures on properties of film was investigated. Phase transformation of cobalt oxide thin films due to the effect of different substrate temperature was also observed. Cyclic voltammetry was used to measure the performance of cobalt oxide supercapacitor. At higher substrate temperature, the cobalt oxide thin films exhibit the high specific capacitance due to the effect of phase transformation in cobalt oxide films.
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Mirzaeian, Mojtaba, Nazym Akhanova, Maratbek Gabdullin, Zhanar Kalkozova, Aida Tulegenova, Shyryn Nurbolat, and Khabibulla Abdullin. "Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors." Energies 13, no. 19 (October 8, 2020): 5228. http://dx.doi.org/10.3390/en13195228.

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Cobalt oxide nanopowders are synthesized by the pyrolysis of aerosol particles of water solution of cobalt acetate. Cobalt nanopowder is obtained by subsequent reduction of obtained cobalt oxide by annealing under a hydrogen atmosphere. The average crystallite size of the synthesized porous particles ranged from 7 to 30 nm, depending on the synthesis temperature. The electrochemical characteristics of electrodes based on synthesized cobalt oxide and reduced cobalt oxide are investigated in an electrochemical cell using a 3.5 M KOH solution as the electrolyte. The results of electrochemical measurements show that the electrode based on reduced cobalt oxide (Re-Co3O4) exhibits significantly higher capacity, and lower Faradaic charge–transfer and ion diffusion resistances when compared to the electrodes based on the initial cobalt oxide Co3O4. This observed effect is mainly due to a wide range of reversible redox transitions such as Co(II) ↔ Co(III) and Co(III) ↔ Co(IV) associated with different cobalt oxide/hydroxide species formed on the surface of metal particles during the cell operation; the small thickness of the oxide/hydroxide layer providing a high reaction rate, and also the presence of a metal skeleton leading to a low series resistance of the electrode.
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Chansaengsri, Kasidid, Korakot Onlaor, Thutiyaporn Thiwawong, and Benchapol Tunhoo. "Effect of Substrate Temperature of on Properties of Cobalt Oxide Thin Films Prepared by Electrostatic Spray Deposition Technique." Applied Mechanics and Materials 848 (July 2016): 103–6. http://dx.doi.org/10.4028/www.scientific.net/amm.848.103.

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In this work, the influence of the substrate temperature on properties of cobalt oxide thin films has been reported. Cobalt oxide thin films were prepared by electrostatic spray deposition technique on glass substrate at different temperature of the substrate. The properties of cobalt oxide films were characterized by X-Ray diffraction (XRD), scanning electron microscope, Raman spectroscopy, UV-visible spectrophotometer, respectively. In additional, the crystalline structural parameters can be performed from XRD data. Phase transformation of cobalt oxide films due to different substrate temperature was observed. Moreover, the optical properties of films were depended on the quantity of phase transition in cobalt oxide film.
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Lin, Chuen-Chang, You-Lun Shen, and An-Na Wu. "The Effects of Power Levels/Time Periods for Sputtering Cobalt onto Carbon Nanotubes/Graphene Composites and Cobalt Annealed on the Characteristics of Anode Materials for Lithium-Ion Batteries." Journal of Nanomaterials 2018 (October 16, 2018): 1–11. http://dx.doi.org/10.1155/2018/9489042.

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Carbon nanotubes/graphene composites are directly grown on nickel foil without additional catalysts by chemical vapor deposition (CVD). Next, the cobalt is deposited on carbon nanotubes/graphene composites by radio frequency (RF) sputtering with different power levels and time periods. Then, the cobalt is transformed into cobalt oxide by annealing. A longer time period of sputtering leads to higher specific capacity. Furthermore, the electrochemical stability of cobalt oxide/carbon nanotubes/graphene composites is higher than that of cobalt oxide.
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Lendzion-Bieluń, Zofia, Roman Jędrzejewski, and Walerian Arabczyk. "The effect of aluminium oxide on the reduction of cobalt oxide and thermostabillity of cobalt and cobalt oxide." Open Chemistry 9, no. 5 (October 1, 2011): 834–39. http://dx.doi.org/10.2478/s11532-011-0059-x.

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AbstractDuring precipitation and calcination at 200°C nanocrystalline Co3O4 was obtained with average size crystallites of 13 nm and a well developed specific surface area of 44 m2 g−1. A small addition of a structural promoter, e.g. Al2O3, increases the specific surface area of the cobalt oxide (54 m2 g−1) and decreases the average size of crystallites (7 nm). Al2O3 inhibits the reduction process of Co3O4 by hydrogen. Reduction of cobalt oxide with aluminium oxide addition runs by equilibrium state at all the respective temperatures. The apparent activation energy of the recrystallization process of the nanocrystalline cobalt promoted by the aluminium oxide is 85 kJ mol−1. Aluminium oxide improves the thermostability of both cobalt oxide and the cobalt obtained as a result of oxide phase reduction.
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Wai, Lee Chia, and Roszilah Ahmad. "Effect of Chromium (II, III) Oxide and Cobalt Oxide on the Colour and Fineness of Cement." Materials Science Forum 857 (May 2016): 373–76. http://dx.doi.org/10.4028/www.scientific.net/msf.857.373.

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The objective of this study is to determine the optimum portions of coloured pigments, chromium (I, II) oxide (Cr2O3) and cobalt oxide in producing coloured cement. The fineness (specific surface area - SS) of coloured cement via Blaine permeability test is also determined. The green and grey colours become darker as the percentages of chromium (II, III) oxide and cobalt oxide are increased. The chromium (II, III) oxide coloured cement become coarser as the added portions of chromium (II, III) oxide pigment is increased from 3 to 9 %. For cobalt oxide coloured cement, it becomes finer as the added portions of the cobalt oxide pigment are increased from 3 to 6 %. Results show that the optimum portions of chromium (II, III) oxide and cobalt oxide being added into the white cement in order to produce the colours at the most best is 5%. The Blaine permeability test shows that the values of the specific surface of the coloured cements comply with the Standard Specification.
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S. Amer, Mabrook, Mohamed A. Ghanem, Prabhakarn Arunachalam, Abdullah M. Al-Mayouf, and Talal A. Aljohani. "Modification Of Mesoporous Titanium Dioxide With Cobalt Oxide Electrocatalyst For Enhanced Oxygen Evolution Reaction." Advanced Materials Letters 10, no. 2 (December 19, 2018): 136–44. http://dx.doi.org/10.5185/amlett.2019.2139.

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Waris, Abdul, Misbahud Din, Asmat Ali, Shakeeb Afridi, Abdul Baset, Atta Ullah Khan, and Muhammad Ali. "Green fabrication of Co and Co3O4 nanoparticles and their biomedical applications: A review." Open Life Sciences 16, no. 1 (January 1, 2021): 14–30. http://dx.doi.org/10.1515/biol-2021-0003.

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Abstract Nanotechnology is the fabrication, characterization, and potential application of various materials at the nanoscale. Over the past few decades, nanomaterials have attracted researchers from different fields because of their high surface-to-volume ratio and other unique and remarkable properties. Cobalt and cobalt oxide nanoparticles (NPs) have various biomedical applications because of their distinctive antioxidant, antimicrobial, antifungal, anticancer, larvicidal, antileishmanial, anticholinergic, wound healing, and antidiabetic properties. In addition to biomedical applications, cobalt and cobalt oxide NPs have been widely used in lithium-ion batteries, pigments and dyes, electronic thin film, capacitors, gas sensors, heterogeneous catalysis, and for environmental remediation purposes. Different chemical and physical approaches have been used to synthesize cobalt and cobalt oxide NPs; however, these methods could be associated with eco-toxicity, cost-effectiveness, high energy, and time consumption. Recently, an eco-friendly, safe, easy, and simple method has been developed by researchers, which uses biotic resources such as plant extract, microorganisms, algae, and other biomolecules such as starch and gelatin. Such biogenic cobalt and cobalt oxide NPs offer more advantages over other physicochemically synthesized methods. In this review, we have summarized the recent literature for the understanding of green synthesis of cobalt and cobalt oxide NPs, their characterization, and various biomedical applications.
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Dissertations / Theses on the topic "Oxyde de cobalt"

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Coutanceau, Martine. "Un nouvel oxyde mixte de cobalt : TlSr2CoO5." Phd thesis, Université Sciences et Technologies - Bordeaux I, 1996. http://tel.archives-ouvertes.fr/tel-00007501.

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Ce mémoire de thèse décrit la synthèse et l'étude d'un nouvel oxyde de formulation TlSr2CoO5, dont la structure est apparentée à celle des cuprates supraconducteurs dits "1201". TlSr2CoO5 présente une transition structurale associée à une transition isolant-métal au voisinage de la température ambiante. La phase haute température métallique est effectivement isotype du cuprate de thallium TlSr2CuO5. La phase basse température est caractérisée par microscopie électronique à transmission et diffraction des rayons X issus du rayonnement synchrotron. Elle présente une modulation des distances Co-O à l'origine d'une surstructure et de la stabilisation de configurations électroniques particulières du cobalt. La caractérisation de TlSr2CoO5 est complétée par une étude EXAFS et XANES au seuil K du cobalt ainsi que par une étude des propriétés électroniques (Mesures de susceptibilité magnétique, propriétés de transport, RMN, calculs de structures de bande). Nous proposons alors un modèle expliquant les propriétés de transport.
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Coutanceau, ‎Martine. "Un nouvel oxyde mixte de cobalt : TlSr₂CoO₅." Bordeaux 1, 1996. http://www.theses.fr/1996BOR10701.

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Ce mémoire de thèse décrit la synthèse et l'étude d'un nouvel oxyde de formulation TlSr2CoO5, dont la structure est apparentée à celle des cuprates supraconducteurs dits "1201". TlSr2CoO5 présente une transition structurale associée à une transition isolant-métal au voisinage de la température ambiante. La phase haute température métallique est effectivement isotype du cuprate de thallium TlSr2CuO5. La phase basse température est caractérisée par microscopie électronique à transmission et diffraction des rayons X issus du rayonnement synchrotron. Elle présente une modulation des distances Co-O à l'origine d'une surstructure et de la stabilisation de configurations électroniques particulières du cobalt. La caractérisation de TlSr2CoO5 est complétée par une étude EXAFS et XANES au seuil K du cobalt ainsi que par une étude des propriétés électroniques (Mesures de susceptibilité magnétique, propriétés de transport, RMN, calculs de structures de bande). Nous proposons alors un modèle expliquant les propriétés de transport.
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Abou, Serhal Cynthia. "Oxydation totale des Composés Organiques Volatils (COV) sur des catalyseurs à base de métaux de transition préparés par voie hydrotalcite : Effet des micro-ondes sur la méthode de synthèse." Thesis, Littoral, 2018. http://www.theses.fr/2018DUNK0529/document.

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Ce travail vise l'étude de l'oxydation catalytique des Composés Organiques Volatils (COVs). L'objectif principal est de trouver des matériaux catalytiques qui sont des alternatives aux métaux nobles très onéreux. La recherche des matériaux catalytiques actifs, sélectifs, stables dans le temps et à base de métaux de transition est abordée. Afin d'améliorer les performances catalytiques des métaux de transition, la dispersion de l'espèce métallique doit être optimisée en utilisant une méthode de synthèse adéquate. Les différents solides préparés ont été caractérisés par différentes techniques physico-chimiques : la Diffraction des Rayons X (DRX), les Analyses Thermiques (ATD/ATG), la Spectroscopie Infrarouge (IR), la Réduction en Température Programmée (H₂-RTP), la Microscopie Electronique à Balayage (MEB), la Spectroscopie de Photoélectrons induits par rayons X (SPX)...De plus, les oxydes obtenus ont été testés dans les réactions d'oxydation totale du COV propène. En premier lieu, nous avons focalisé notre travail sur la préparation d'une série d'oxydes mixtes Co-Mg/Al-Fe par voie hydrotalcite afin d'obtenir des propriétés intéressantes en catalyse hétérogène. Cette étude consiste surtout à évaluer la substitution des cations bivalents et trivalents. Il s'est avéré que le solide contenant à la fois du cobalt et du fer (CoFe) possède l'activité catalytique la plus élevée. L'intérêt de la voie hydrotalcite par rapport à d'autres méthodes de synthèse, telles que la méthode classique et le mélange mécanique des oxydes a été mis en évidence. En second lieu, l'utilisation des irradiations micro-ondes lors de la synthèse des matériaux hydrotalcites a été également étudiée comme une méthode de synthèse non-conventionnelle. Un effet bénéfique a été observé avec l'utilisation des micro-ondes dû principalement à des surfaces spécifiques plus élevées et à une meilleure réductibilité des espèces oxydes. En outre, cette étude vise également la mise au point de cette nouvelle méthode. De ce fait, l'optimisation de la température, durée et puissance des irradiations micro-ondes a été effectuée sur le solide CoFe, afin de montrer l'influence de chaque paramètre sur les propriétés physico-chimiques des matériaux. En troisième lieu, la synthèse d'une série de catalyseurs par voie hydrotalcite avec différentes teneurs en Co²⁺ et Fe³⁺ a été effectuée. L'influence du rapport molaire sur la structure hydrotalcite a été montrée. Une comparaison entre ces solides et ceux préparés par la méthode micro-ondes a été également abordée
This work aims to study the catalytic oxidation of Volatile Organic Compounds (VOCs). The main objective is to find catalytic materials that are alternatives to very expensive noble metals. The search for transition metal based catalysts is investigated. Furthermore, to improve the catalytic performance of the transition metals, their dispersion must be optimized using an adequate synthetic method. The various prepared solids were characterized by different physicochemical techniques : X-ray Diffraction (XRD), Thermal Analysis (TDA/TGA), Infrared Spectroscopy (IR), Temperature Programmed Reduction by hydrogen (H₂-TPR), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS)...Moreover, the obtained oxides were tested in the total oxidation of the VOC propene. Firstly, we focused our work on the preparation of a series of Co/Fe hydrotalcites -like samples by the traditional co-precipitation method. This study consists mainly of evaluating the substitution of bivalent and trivalent cations. It has been found that the solid containing both cobalt and iron (CoFe) has the highest catalytic activity. The interest of the hydrotalcite route compared to other methods of synthesis, such as the classical method and the mechanical mixing of oxides was put into evidence. Secondly, the use of microwave irradiation during the synthesis of hydrotalcite materials has also been studied as an unconventional method of synthesis. A beneficial effect has been observed with the use of microwaves due mainly to higher specific surface areas and better reducibility of the oxide species. In addition, an optimization of the temperature, duration, and power of the microwave irradiations was carried out on the CoFe solid, in order to show the influence of each parameter on the physico-chemical properties of the materials. Thirdly, the synthesis of a series of hydrotalcite catalysts with different ratio of Co²⁺ and Fe³⁺ was carried out. The influence of the molar ratio on the hydrotalcite structure has been shown. A comparison between these solids and those prepared by the microwave method was also discussed
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Pascanut, Decorse Claudia. "Systèmes magnétiques dilués à base d'oxydes." Paris 11, 2006. https://tel.archives-ouvertes.fr/tel-00127088.

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Suite aux travaux ayant mis en évidence une forme de ferromagnétisme inhabituelle à température ambiante dans des couches minces d'oxyde de titane dopées au cobalt, la recherche de comportement analogue dans des matériaux massifs à base de pérovskite SrTiO3 a été entreprise. En substituant le titane par le cobalt ou le fer, des solutions solides SrTi(1-x)M(x)O(3-d) (M = Co, Fe ; 0. 01 plus petit ou égal à x plus petit ou égal à 0. 50) ont été préparées ; de plus, la stœchiométrie en oxygène de certaines compositions a été modifiée par traitement sous faible pression partielle d'oxygène. Les propriétés magnétiques de ces deux systèmes sont très ressemblantes. Un comportement paramagnétique est mis en évidence dans toutes les compositions, seuls les échantillons fortement dopés (x plus grand ou égal à 0. 35) présentent une transition vers un état verre de spin. Une composante ferromagnétique a été mise en évidence à basse température dans ces échantillons à forte concentration en dopant et associée aux échanges ferromagnétiques qui peuvent exister dans ces systèmes. Dans les échantillons faiblement dopés (x=0. 01 et 0. 02) une composante ferromagnétique très faible a été observée à la température ambiante ; son évolution avec la concentration en dopant ainsi qu'avec la stœchiométrie en oxygène des composés a été étudiée. Les résultats obtenus suggèrent que le dopant pourrait ne pas être à l'origine de ce ferromagnétisme. Les compositions les plus riches en fer ou en cobalt ont un comportement semi-conducteur présentant une dépendance en température inattendue
Following the report of a new kind of room temperature ferromagnetism in thin films of titanium oxide doped with cobalt, the research of analogous properties in bulk SrTiO3-based perovskite was considered. Solid solutions of SrTi(1-x)M(x)O(3-d) (M = Co, Fe ; 0. 01 less or equal to x less or equal to 0. 50) were prepared by substitution of cobalt or iron fot titanium; the oxygen stoechiometry was modified for some of these compositions by thermal treatment under low oxygen pressure. The magnetic properties of the two systems under study are very similar. All the compositions have a paramagnetic behavior; only in highly doped samples (x higher or equal to o. 35) a transition to a spin glass state is show. A small ferromagnetic component was detected at low temperature in these high doped samples and associated with some ferromagnetic exchange interactions that can exist in the systems. In the weakly doped samples (x=0. 01 and 0. 02) a different small ferromagnetic signal was detected at room temperature; his evolution with the dopant concentration and oxygen stoechiometry was studied. The results suggest that the dopant may not be at the origin of the observed ferromagnetism. The highly doped samples show a semiconductor behavior with unexpected temperature dependence
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Turczyniak, Sylwia. "Surface composition of cobalt catalysts for steam reforming of ethanol." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF031/document.

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L’objectif de cette thèse de doctorat a consisté à déterminer l’influence des conditions réactionnelles du vaporeformage de l’éthanol (ESR), de la dispersion du catalyseur et de la promotion par le potassium sur l’état de la surface. Ce travail a aussi aidé à comprendre l’influence de ces facteurs sur les propriétés catalytiques. Nous avons utilisé les catalyseurs à base de cobalt (promus et non promus par le potassium) supportés à l’oxyde de cérium et à l’oxyde de zirconium à faible et à forte dispersion. Les changements de l’état de la surface des catalyseurs pendant la réaction d’ERS ont été étudiés à travers la spectrométrie photoélectronique X (XPS), alors que les changements des produits ont été analisés en utilisant la spectrométrie de masse et la chromatographie en phase gazeuse. Le catalyseur supporté sur oxyde de cérium à forte dispersion a été caractérisé sous une basse pression (0.2-20 mbar) avec le rapport molaire eau/éthanol de 3/1 (420ºC). Les autres tests ont été faits sur tous les catalyseurs sous une pression totale de 1 atm avec les rapports molaires de 3/1, 9/1, 12/1 (420ºC). Nous avons utilisé un mélange eau/éthanol dans un rapport molaire de 12/1 pour étudier les changements de l’état de la surface de tous les catalyseurs dans le temps. Il a été démontré que la sélectivité d’ESR des catalyseurs pour produire des gaz et pour déposer le carbone est réglée par la concentration des groupes hydroxyles sur la surface. Quant aux catalyseurs promus, elle dépend aussi de la concentration Kδ+–Osurfδ-
The aim of the thesis was determination the influence of the ethanol steam reforming (ESR) reaction conditions, catalyst’s dispersion and potassium promotion on a surface’s composition and understanding the influence of these changes on catalysts’ performance. Cobalt-based catalysts (unpromoted and promoted with potassium) with low- and high-dispersed ceria and zirconia supports were used. The changes of the surface state of catalysts during the ESR were studied by means of X-ray photoelectron spectroscopy, whereas the reaction products evolution was followed by mass spectrometer or gas chromatograph. Highly-dispersed ceria-supported catalyst was characterized under low pressure conditions (0.2–20 mbar) with the water/ethanol molar ratio equal to 3/1 (at 420ºC). The other tests were carried out over all catalysts under total pressure of 1 atm with 3/1, 9/1 and 12/1 molar ratios (at 420ºC). The water/ethanol ratio of 12/1 was chosen for studies of the surface state of all catalysts with time-on-stream. It was found that the ESR selectivity to gaseous products and carbon deposition is governed mainly by surface hydroxyl species concentration; in the promoted catalysts together with Kδ+–Osurfδ- surface sites
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Adán, Mas Alberto. "Advanced metal graphene composite electrodes for a new generation of electrochemical energy storage devices." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0181/document.

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Actuellement, les supercondensateurs sont au centre de beaucoup de recherches. Ils offrent une solution potentielle pour le stockage réversible de l´énergie que ce soit pour le domaine spatial, aéronautique ou encore le transport (véhicules hybrides). Un axe de recherche important, visant à augmenter les densités d'énergie et de puissance, est consacré aux systèmes oxydes de métaux de transition /charbon actif (C) asymétriques. Les systèmes à base de RuO2 présentent les capacités les plus élevées, supérieures à 700 F/g, mais leur coût et leur toxicité limitent leur application aux petits appareils électroniques. Des oxydes moins coûteux tels que les oxydes de cobalt (notamment Co3O4), MnO2, V2O5, Fe3O4, NiO, Ni(OH)2, ainsi que des polymères conducteurs électroniques, ont été étudiés de manière approfondie au cours des dernières décennies jusqu’à être utilisés, pour certains, dans des dispositifs commerciaux. Mais aucun système n’a été aussi étudié que le C / MnO2. En effet, il a été démontré que ce dernier est particulièrement intéressant car il peut fonctionner dans des milieux aqueux à des tensions pouvant aller jusqu’à 2V tout en gardant une bonne stabilité électrochimique durant le vieillissement. Néanmoins, les performances du système, en particulier en termes de densité de puissance, sont limitées à cause de la mauvaise conductivité électronique du MnO2. Il est possible de surmonter ce problème en ajoutant à l’oxyde de manganèse, des matériaux conducteurs à base de carbone (noir de carbone, nanotubes de carbone…) ou encore, en développant des stratégies de greffage ou de décoration plus élaborées. La combinaison d’oxydes avec des espèces carbonées est très largement rapportée dans la littérature alors que le mélange d’oxydes de différente nature l’est beaucoup moins. Nous proposons dans ce projet de synthétiser et de développer des matériaux originaux améliorant, par un effet synergique, les propriétés intéressantes du manganèse, du cobalt et de l'oxyde / hydroxyde de nickel. Les inconvénients de chaque composant étant compensés par les bonnes propriétés complémentaires des autres. Nous cherchons à réunir en un seul matériau (ou composite), le bon comportement pseudocapacitif du manganèse, la bonne conductivité électronique associée aux oxydes de cobalt, la grande capacité de l'hydroxyde de nickel ainsi que les propriétés de conduction du carbone. Ce projet de doctorat vise à concevoir et à fabriquer de nouvelles classes d'électrodes composites hybrides basées sur des assemblages de graphène (pour la capacitance renforcée à double couche) et d'oxydes poreux de métaux de transition (pour une capacité faradique supplémentaire due à de multiples processus rédox réversibles). Les avantages combinés du graphène et des oxydes de métaux de transition permettront aux supercondensateurs à haute densité d'énergie de travailler dans des électrolytes aqueux respectueux de l'environnement ce qui est, aujourd’hui, un besoin reconnu
Supercapacitors are the focus of much research at the present time. They offer a potential solution for reversible energy storage in the fields of space, aircrafts or transportation (hybrid vehicles). An important research line, aiming at increasing both energy and power densities, is devoted to asymmetric transition metal oxides / activated carbon (C) systems. RuO2-based devices exhibit the highest capacitance, more than 700 F/g, but their cost limits the applications to small electronic devices. Less expensive oxides such as cobalt oxides (especially Co3O4), MnO2, V2O5, Fe3O4, NiO, Ni(OH)2, as well as electrically conducting polymers, have been extensively studied in the past decades, or used in commercial devices; they EACH exhibit each drawbacks and advantages with regard to applications. But no system has been investigated as much as the C/MnO2 one, which is particularly interesting because it can work in aqueous media at tensions up to 2 V, and high stability in ageing has been demonstrated. Nevertheless, the performances of the system, especially in terms of power density, are limited by the poor electronic conductivity of MnO2. This problem is usually solved by simply mixing conductive carbon materials (carbon black, CNTs…) with MnO2 or by developing more elaborated grafting or decoration strategies. The combination of oxide and carbonaceous species is widely reported in the literature, whereas combining oxides with different natures is less frequently encountered. We propose in this project to synthesize and develop original materials enhancing, through a synergistic effect, the interesting properties of manganese, cobalt and nickel oxide/hydroxide, the drawbacks of each component being overbalanced by the good complementary properties of the other components. We aim at gathering in one single material (or composite), the good pseudocapacitive behavior of manganese, the good electronic conductivity associated to cobalt oxides, the high capacity of nickel hydroxide, as well as the enhanced conduction properties of carbon. The present PhD project aims at designing and manufacturing new classes of hybrid composite electrodes based on assemblies of graphene (for enhanced double layer capacitance) and porous transition metals oxides (for additional faradaic capacitance due to multiple reversible redox processes) directly applied on metallic current collectors. The combined advantages of graphene with those of transition metals oxides will enable supercapacitors with high energy density, working in environmentally friendly aqueous electrolytes, which are an acknowledged need
A procura crescente de energia em setores distintos, como residencial, transporte e industrial, bem como a proliferação de fontes renováveis de produção de energia, exigem novos e mais eficientes dispositivos de armazenamento de energia. Consequentemente, tem-se observado um interesse crescente na produção e engenharia de materiais para armazenamento de energia. Muito dos esforços de R&D estão centrados no desenvolvimento de materiais nanoestruturados que possam responder aos requisitos da aplicação, tais como densidade de energia, densidade de potência e estabilidade face à ciclagem do dispositivo. Presentemente são muitos os materiais investigados como potenciais candidatos para elétrodos para dispositivos de armazenamento de energia por via eletroquímia, nomeadamente baterias, condensadores, pseudocondensadores ou supercondensadores. O objetivo do presente trabalho é produzir e estudar novos materiais com uma resposta eletroquímica intermédia entre um elétrodo típico de supercondensador e um elétrodo típico de bateria, também conhecidos como elétrodos híbridos. Por essa razão, selecionaram-se hidróxidos e óxidos de níquel e cobalto devido à sua elevada atividade eletroquímica e baixo custo. Estes materiais foram combinados com derivados de grafeno, que exibem alta condutividade e elevada área superficial ativa. Portanto, este trabalho foca a síntese e caracterização fisico química e eletroquímica de hidróxidos e óxidos de níquel-cobalto nanoestruturados e sua combinação com óxido de grafeno reduzido para aplicações de armazenamento de energia. A síntese foi efectuada por duas vias distintas: eletrodeposição e exfoliação. A eletrodeposição é usada para obter hidróxidos e óxidos de níquel-cobalto em combinação com óxido de grafeno reduzido. Os resultados evidenciam um efeito sinérgico quando o óxido de grafeno reduzido é combinado com o (hidr)óxido de níquel- cobalto, isto é, um aumento na capacidade, condutividade e estabilidade do compósito quando comparado com o (hidr)óxido de níquel-cobalto. Neste trabalho é dada especial atenção à espectroscopia de impedância eletroquímica que foi utilizada para avaliar os fenômenos que ocorrem durante a carga e descarga contínua e compreender os processos que ocorrem no material ativo e que resultam na sua degradação. O hidróxido de níquel-cobalto é também preparado por exfoliação, em meio aquoso, por meio da intercalação de lactato, enquanto o tetra-butilamónio é utilizado na exfoliação do óxido de níquel-cobalto. A resposta eletroquímica é avaliada em diferentes eletrólitos após reconstrução. Os resultados revelam a influência das espécies intercaladas durante o processo de exfoliação: quando a exfoliação é realizada para fins de armazenamento de energia, as espécies intercaladas e a força da interação com o material ativo devem ser consideradas de antemão para evitar o bloqueio superficial ou inibição da interação elétrodo-eletrólito. Os resultados mostraram que a exfoliação é uma rota promissora para aumentar a área de superfície ativa dos materiais, um parâmetro crítico no desempenho eletroquímico dos materiais dos eletrodos. Nesta dissertação é também estudado o mecanismo de carga-descarga do hidróxido de níquel-cobalto, que ainda não está completamente entendido. Assim, compreender esse mecanismo é um passo crítico para otimizar a morfologia e o desempenho do material e para projetar futuros dispositivos de armazenamento de energia. Para esclarecer os processos que ocorrem durante a carga, aplica-se o modelo de Mott-Schottky foi aplicado parade modo a avaliar a variação da conductividade do material e da sua capacidade na interface elétrodo-eletrólito. [...]
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Koutani, Saïd. "Étude du comportement magnétique de deux matériaux nanocristallins : poudre de maghémite;films de ferrite de cobalt." Nancy 1, 1993. http://www.theses.fr/1993NAN10338.

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L'objet de cette thèse concerne l'étude du comportement magnétique d'une poudre d'agrégats de maghémite obtenue par une méthode chimique et des films de ferrite de cobalt préparés par pulvérisation réactive. Bien que la taille du grain soit nanométrique, les deux systèmes ne présentent pas de comportement supe paramagnétique. Nous avons mis en évidence l'effet des interactions entre cristallites. La poudre de maghémite présente des analogies de comportement avec les ferromagnétiques à anisotropie aléatoire. Les films de ferrite de cobalt présentent un caractère verre de spins avec des corrélations ferrimagnétiques plus ou moins étendues. L'étude hors-équilibre des films montre que la distribution des barrières d'énergie ne dépend que d'un seul paramètre, le champ magnétique h#0
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Vodungbo, Boris. "Systèmes oxyde pour l'électronique de spin : étude de l'oxyde magnétique dilué CeO2 dopé au cobalt et d'assemblées de nano-particules de cobalt dans TiO2−delta." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2007. http://tel.archives-ouvertes.fr/tel-00248420.

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Ce travail rend compte de l'étude de l'oxyde magnétique dilué CeO2 dopé au cobalt et de nano-particules de cobalt dans TiO2-delta. Ces
dernières sont entièrement métalliques et présentent des propriétés de magnéto-transport intéressantes. Les couches minces de (Ce,Co)O2 sont texturées sur Si et épitaxiées sur SrTiO3. Celles élaborées sous vide sont ferromagnétiques avec une anisotropie magnétique et un axe facile perpendiculaire à la surface. Celles élaborées ou recuites sous O2 sont beaucoup plus faiblement ferromagnétiques et leur aimantation augmente fortement après un recuit sous vide. Les propriétés magnétiques des couches minces de (Ce,Co)O2 peuvent donc être manipulées réversiblement par des recuits sous atmosphère contrôlée. Le ferromagnétisme n'est pas dû à une phase secondaire comme du cobalt métallique. Des mesures spectroscopiques indiquent que l'état ferromagnétique est
corrélé à une forte concentration en lacunes d'oxygène.
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Al-Nafiey, Amer Khudair Hussien. "Reduced graphene oxide-based nanocomposites : synthesis, characterization and applications." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10009/document.

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Nous avons synthétisé avec succès ces nano-composés (rGO/Arg-Ag NPs, rGO-Ni NPs and rGO-Co3O4NPs) et les avons caractérisés par de nombreuses techniques, XPS, SEM, TEM, FTIR, Raman, UV-Vis et TGA. Les analyses montrent que ces nano-composés à base de graphène ont des propriétés excellentes et une grande stabilité. Utilisés comme catalyseurs dans des applications environnementales, ils réduisent efficacement le 4-nitrophenol en 4-aminophenol ainsi que les colorants à forte adsorption et le chrome (VI) présents dans les eaux usées
We successfully obtained these nanocomposites (rGO/Arg-Ag NPs, rGO-Ni NPs and rGO-Co3O4NPs).The resulting rGO-based nanocomposites were characterized by a variety of different techniques, including XPS, SEM, TEM, FTIR, Raman, UV-Vis and TGA. These analysis shows that these graphene-based nanocomposites have excellent properties and stability. The rGO-based nanocomposites, applied as a catalyst in environmental applications and shows good catalytic performance for reduction of 4nitrophenol to 4aminophenol and high adsorption dyes and Cr (VI) from wastewater
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Romeo, Michelangelo. "Propriétés des catalyseurs intermétalliques platine-uranium, platine sur oxyde d'uranium et platine-cobalt-oxyde d'uranium sur alumine pour les réactions de réarrangement de squelette des hydrocarbures." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37609454k.

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Books on the topic "Oxyde de cobalt"

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Boose, C. A. Cobalt oxide spectral selective coatings. Luxembourg: Commission of the European Communities Directorate-General Information Market and Innovation, 1985.

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Shukri, Rashid Jaber Asa'd. Supported oxide catalysts: Cobalt oxide and molybdena on titania. Uxbridge: Brunel University, 1989.

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Bailey, Steven John. A study of the catalytic properties of unpromoted and promoted cobalt-iron oxide spinels. Uxbridge: BrunelUniversity, 1991.

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Preparation of metallic cobalt by reduction of the oxide. Ottawa: Govt. Print. Bureau, 1997.

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Book chapters on the topic "Oxyde de cobalt"

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Bährle-Rapp, Marina. "Cobalt Titanium Oxide." In Springer Lexikon Kosmetik und Körperpflege, 120. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_2223.

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Wang, Jing, Jinglong Liang, Hui Li, and Jie Xu. "Reduction Mechanism of Metal Cobalt from Cathode Material of Waste Lithium Cobalt Oxide Battery." In TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings, 1301–7. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36296-6_120.

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Fergus, Jeffrey W., Yingjia Liu, and Yu Zhao. "Manganese Cobalt Spinel Oxide Based Coatings for SOFC Interconnects." In Ceramic Transactions Series, 141–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118511435.ch15.

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Karakurkchi, Ann V., Nikolay D. Sakhnenko, Maryna V. Ved’, and Maryna V. Mayba. "Nanostructured Mixed Oxide Coatings on Silumin Incorporated by Cobalt." In Springer Proceedings in Physics, 269–91. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17759-1_19.

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Nikam, Revannath D., Sharad S. Gaikwad, Ganesh E. Patil, Gotan H. Jain, and Vishwas B. Gaikwad. "Synthesis and Applications of Nano Size Titanium Oxide and Cobalt Doped Titanium Oxide." In Chemistry for Sustainable Development, 57–68. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8650-1_4.

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Suresh, Aravind, Joysurya Basu, Nigel M. Sammes, C. Barry Carter, and Benjamin A. Wilhite. "Synthesis and Activity of Cobalt-Doped Barium Cerium Zirconate for Catalysis and Proton Conduction." In Advances in Solid Oxide Fuel Cells V, 167–73. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470584316.ch15.

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Stewart, C. A., R. K. Rhein, A. Suzuki, T. M. Pollock, and C. G. Levi. "Oxide Scale Formation in Novel γ-γ′ Cobalt-Based Alloys." In Superalloys 2016, 991–99. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119075646.ch105.

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Peri, J. B. "Computerized IR Studies of Cobalt-Molybdenum-Aluminum Oxide Hydrodesulfurization Catalysts." In Catalyst Characterization Science, 422–34. Washington, DC: American Chemical Society, 1985. http://dx.doi.org/10.1021/bk-1985-0288.ch036.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of cobalt(II) trizene-1-oxide bis(chelates)." In Magnetic Properties of Paramagnetic Compounds, 1051–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_614.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of cobalt(II) triazene-1-oxide bis(chelates)." In Magnetic Properties of Paramagnetic Compounds, 1053–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_615.

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Conference papers on the topic "Oxyde de cobalt"

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Rebello, Valeta, Shamshad Shaikh, and P. V. Desai. "Toxicity of cobalt Oxide Nanoparticles." In 2010 International Conference on Environmental Engineering and Applications (ICEEA). IEEE, 2010. http://dx.doi.org/10.1109/iceea.2010.5596127.

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Chang, Y. M., Y. J. Hsu, T. M. Liu, H. W. Chu, Y. J. Chuo, J. G. Lin, and C. H. Chen. "Magnetization-induced second-harmonic generation of cobalt and cobalt oxide nanoparticles." In Integrated Optoelectronic Devices 2006, edited by Kong-Thon Tsen, Jin-Joo Song, and Hongxing Jiang. SPIE, 2006. http://dx.doi.org/10.1117/12.657821.

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Ramachandran, T., N. E. Rajeevan, P. P. Pradyumnan, Alka B. Garg, R. Mittal, and R. Mukhopadhyay. "Thermoelectric Property of Cobalt Oxide Films." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3606207.

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Vahedi, Nasser, Carlos E. Romero, Mark A. Snyder, and Alparslan Oztekin. "Study of Heating and Cooling Rate of Cobalt Oxide-Based TCES System Using Experimental Redox Kinetics Analysis." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10734.

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Abstract Cost-effective solar power generation in CSP plants requires the challenging integration of high energy density and high-temperature thermal energy storage with the solar collection equipment and the power plant. Thermochemical energy storage (TCES) is currently a very good option for thermal energy storage, which can meet the industry requirement of large energy density and high storage temperature. TCES specifically exploits reversible chemical reactions wherein heat is absorbed during the forward endothermic reaction and released during the reverse exothermic reaction. The associated enthalpic storage of energy (i.e., the heat of reaction) offers higher density and enhanced stability compared to sensible and latent heat storage. Metal oxide redox reactions are particularly well-suited for TCES given their characteristically high enthalpy of reaction and high reaction temperature. In addition, the air is suitable as both a heat transfer fluid (HTF) and reactant; thus, simplifying process design and eliminating the need for indirect HTF storage and any intermediate heat exchanger. Among the palette of available metal oxides, cobalt oxide is one of the most promising candidates for TCES given its high enthalpy of reaction with high reaction temperature. One of the critical design parameters for TCES reactors is the optimal heating and cooling rates during respective charging and discharging modes of operation. In order to study the effect of heating/cooling rate on cobalt oxide TCES performance, a constant 10°C/min rate was selected for both storage cycle heating and cooling. Considering the intrinsic redox kinetics of cobalt oxide at considered constant heating/cooling rate, we studied milligram scale quantities of cobalt oxide (99.9% purity, 40 μm average particle size) using a dual-mode thermogravimetric (TGA)/differential scanning calorimetry (DSC) system, which simultaneously measures weight change (TGA) and differential heat flow (DSC) as a function of TCES cycling under continuous air purge. In addition, we investigated the cyclic stability of cobalt oxide in the context of the redox kinetics and particle coarsening behavior, employing scanning electron microscopy (SEM). TGA/DSC tests were conducted for 30 successive cycles using pure cobalt oxide. It was shown that pure cobalt oxide in powder form (38μ particle size) could complete both forward and reverse reaction at the selected heating rate with little degradation between cycles. In parallel, SEM was used to examine morphology and particle size changes before and after heating cycles. SEM results proved grain growth occurs even after only five initial cycles.
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Koziarskyi, Ivan P., Eduard V. Maistruk, Dmytro P. Koziarskyi, and Pavlo D. Maryanchuk. "Optical Properties of Cobalt Oxide Thin Films." In 2020 IEEE 10th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2020. http://dx.doi.org/10.1109/nap51477.2020.9309681.

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Manteghi, Faranak, and Masoud Peyvandipour. "Oxalate-assisted synthesis of nano cobalt oxide." In The 17th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2013. http://dx.doi.org/10.3390/ecsoc-17-a015.

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Li, Muchan, Zhongzheng Tian, Xuemin Yu, Dacheng Yu, Zhongyang Ren, Liming Ren, and Yunyi Fu. "Single-Electron Transistor Based on Cobalt Oxide." In 2021 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2021. http://dx.doi.org/10.1109/iscas51556.2021.9401306.

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Mueller, M., R. Henne, G. Schiller, M. I. Boulos, F. Gitzhofer, and R. B. Heimann. "Radio-Frequency Suspension Plasma Spraying of Cobalt Spinel Anodes for Alkaline Water Electrolysis." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1523.

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Abstract Suspensions of cobalt spinel (Co3O4) powders (median size 6 µm and 0.3 µm) were r.f. plasma sprayed to form electrocatalytically active anode layers for alkaline water electrolysis. Stable cobalt oxide suspensions of low viscosity and exceeding 50wt.% solid phase content have been processed. A spheroidization study revealed the formation of large spherical powder particles (- 30 + 80 µm). Cobalt oxide coatings were produced by this novel r.f.-Suspension Plasma Spraying (SPS) method. The porosity was controlled by optimizing the spray distance and the reactor pressure. The main disadvantage of the thermal plasma processing of cobalt spinel, i.e. the decomposition of the spinel phase into CoO, could not be prevented, not even with the application of an 80% oxygen plasma. With a relatively low power oxygen plasma post-treatment the deposited CoO layers can be oxidized to Co3O4 resulting in a promising improvement of the electrochemical performance of the anode layers.
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Deotale, Anjali Jain, A. K. Sinha, M. N. Singh, Anuj Upadhyay, and R. V. Nandedkar. "Annealing effects on microstrain of cobalt oxide nanoparticles." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872589.

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Levi, C., T. Pollock, R. Rhein, C. Stewart, and A. Suzuki. "Oxide Scale Formation in Novel ?-?' Cobalt-Based Alloys." In Superalloys 2016. The Minerals, Metals & Materials Society, 2016. http://dx.doi.org/10.7449/superalloys/2016/superalloys_2016_991_999.

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Reports on the topic "Oxyde de cobalt"

1

Bai, C. S., S. Soled, K. Dwight, and A. Wold. Preparation and Characterization of Dispersed 'Cobalt Oxide' Supported on Gamma-Al2O3. Fort Belvoir, VA: Defense Technical Information Center, December 1990. http://dx.doi.org/10.21236/ada231269.

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Morris D. Argyle. Supported, Alkali-Promoted Cobalt Oxide Catalysts for NOx Removal from Coal Combustion Flue Gases. Office of Scientific and Technical Information (OSTI), December 2005. http://dx.doi.org/10.2172/913563.

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