Relevant bibliographies by topics / Oxygen storage capacity

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Oxygen storage capacity'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Oxygen storage capacity"

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Hou, Limin, Qingbo Yu, Kun Wang, Tuo Wang, Fan Yang, and Shuo Zhang. "Oxygen storage capacity of substituted YBaCo4O7+δ oxygen carriers." Journal of Thermal Analysis and Calorimetry 137, no. 1 (November 22, 2018): 317–25. http://dx.doi.org/10.1007/s10973-018-7903-6.

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Khossusi, T., R. Douglas, and G. McCullough. "Measurement of oxygen storage capacity in automotive catalysts." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 8 (August 1, 2003): 727–33. http://dx.doi.org/10.1243/09544070360692113.

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There is considerable disagreement in the literature on available oxygen storage capacity, and on the reaction rates associated with the storage process, for three-way automotive catalysts. This paper seeks to address the issue of oxygen storage capacity in a clear and precise manner. The work described involved a detailed investigation of oxygen storage capacity in typical samples of automotive catalysts. The capacity has also been precisely defined and estimates have been made of the specific capacity based on catalyst dimensions. A purpose-built miniature catalyst test rig has been assembled to allow measurement of the capacity and the experimental procedure has been developed to ensure accurate measurement. The measurements from the first series of experiments have been compared with the theoretical calculations and good agreement is seen. A second series of experiments allowed the e ect of temperature on oxygen storage capacity to be investigated. This work shows very clearly the large variation of the capacity with temperature.
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Kudyakova, V. S., B. V. Politov, A. V. Chukin, A. A. Markov, A. Yu Suntsov, and V. L. Kozhevnikov. "Phase stability and oxygen storage capacity of PrBaMn2O6–." Materials Letters 269 (June 2020): 127650. http://dx.doi.org/10.1016/j.matlet.2020.127650.

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Mamontov, E., R. Brezny, M. Koranne, and T. Egami. "Nanoscale Heterogeneities and Oxygen Storage Capacity of Ce0.5Zr0.5O2." Journal of Physical Chemistry B 107, no. 47 (November 2003): 13007–14. http://dx.doi.org/10.1021/jp030662l.

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Su, E. C., C. N. Montreuil, and W. G. Rothschild. "Oxygen storage capacity of monolith three-way catalysts." Applied Catalysis 17, no. 1 (July 1985): 75–86. http://dx.doi.org/10.1016/s0166-9834(00)82704-9.

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HANEDA, Masaaki, Takeshi MIKI, Noriyoshi KAKUTA, Akifumi UENO, Syuji TATEISHI, Shinji MATSUURA, and Masayasu SATO. "Oxygen storage capacity of alumina-supported Rh/CeO2 catalyst." NIPPON KAGAKU KAISHI, no. 8 (1990): 820–23. http://dx.doi.org/10.1246/nikkashi.1990.820.

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Machida, Masato, Kiyotaka Kawamura, Kazuhiro Ito, and Keita Ikeue. "Large-Capacity Oxygen Storage by Lanthanide Oxysulfate/Oxysulfide Systems." Chemistry of Materials 17, no. 6 (March 2005): 1487–92. http://dx.doi.org/10.1021/cm0479640.

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Meiqing, Shen, Wang Xinquan, An Yuan, Weng Duan, Zhao Minwei, and Wang Jun. "Dynamic Oxygen Storage Capacity Measurements on Ceria-Based Material." Journal of Rare Earths 25, no. 1 (February 2007): 48–52. http://dx.doi.org/10.1016/s1002-0721(07)60043-x.

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Shi, Z. M. "Cordierite-CeO2 Composite Ceramic: A Novel Catalytic Support Material for Purification of Vehicle Exhausts." Key Engineering Materials 280-283 (February 2007): 1075–78. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1075.

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Stable oxygen concentration in exhausts is a decisive factor in catalytic purification of the vehicle exhausts. Nanostructured CeO2 is generally added into catalytic coating on a ceramic support to adjust the oxygen concentration because it possesses a unique oxygen storage capacity (OSC). However, a small amount of CeO2 gets insufficient when the oxygen concentration fluctuates in a large range. In the present work, the cordierite-CeO2 composite ceramic with oxygen storage capacity was prepared for a support material of catalytic converters. The oxygen storage-release performance of the ceramics, including temperature of releasing oxygen, adsorption process of oxygen and the oxygen storage, was examined by a temperature-programmed gas chromatography. The composition of the ceramics was analyzed by an X-ray powder diffraction (XRD) and a scanning electron microscope (SEM) to validate the reliability of the ceramic as the support material with OSC. Results show that the ceramics consist of α-cordierite and CeO2 phases, the latter of which is uniformly dispersed throughout the cordierite matrix. The ceramic powder with 10-20wt% of CeO2 possesses the expected oxygen storage capacity. It is suggested that this novel cordierite-CeO2 composite ceramic is helpful of improving the purification effect of vehicle exhausts.
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Beppu, Kosuke, Saburo Hosokawa, Kentaro Teramura, and Tsunehiro Tanaka. "Oxygen storage capacity of Sr3Fe2O7−δ having high structural stability." Journal of Materials Chemistry A 3, no. 25 (2015): 13540–45. http://dx.doi.org/10.1039/c5ta01588j.

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Dissertations / Theses on the topic "Oxygen storage capacity"

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Mucelini, Johnatan. "Estudo ab initio da adsorção de átomos de zircônio sobre superfí­cies de óxido de cério: Zrn/CeO2(111)." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-23102018-161515/.

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Catalisadores baseados em óxidos de cério (CeOx, 3/2≤ x ≤ 2) como suporte são utilizados em várias reações de alto interesse econômico, por exemplo as reações de catalizadores de três-vias. Sabe-se que é possível melhorar as propriedade catalíticas da céria, através da mistura com óxido de zircônio e com a adição de partículas metálicas na superfície do material. Entretanto, a deposição de átomos de Zr sobre CeO2(111) é pouco explorada apesar de já ter sido utilizada para a síntese de nanopartículas de Ag de tamanho controlado. Uma das particularidades dos sistemas Zr/CeO2(111) é formar ilhas altura entre 1,5 e 3,0 Å sobre a superfície da céria que são sugeridas na literatura com camadas de Zr-O e O-Zr-O. Entretanto, a natureza e magnitudes das interações entre Zr e CeO2(111) ainda não são totalmente conhecidas, bem como as modificações causadas pelo Zr na superfície de CeO2 e os mecanismos que controlam a oxidação do Zr e a formação de ZrO2 na superfície. Visando entender as interações Zr/CeO2(111) e a formação de ZrO2 sobre CeO2(111), realizou-se um estudo teórico da adsorção de n (1 ≤n ≤ 4) adatomos de Zr sobre CeO2(111), e da formação de ZrO2 sobre CeO2(111). As análises de carga indicam transferências de carga do adatomos de Zr para a superfície e mudança no estado de oxidação das espécies. Os Zr se oxidam á Zr4+ e interagem com O2- da superfície, onde quatro cátions Ce4+ se reduzem á Ce3+. Analises energéticas indicam que o processo é muito estabilizante, mais de 10 eV por Zr. Com o aumento da quantidade n de adatomos de Zr na superfície, observa-se 4 × n reduções de Ce4+ e migrações de O2- de dentro da superfície para próximo dos Zr4+, formando agregados de ZrO2 sobre a superfície. A migração de O se deve a dois fatores, a interação dos O2- com Zr4+ no agregado é mais estável do que a interação dos O2- com Ce3+ dentro da superfície, e a migração de O diminuir a tensão causada pelo maior raio do Ce3+ em relação ao Ce4+. Em adição, foi encontrado uma tendência de estabilidade para os Zr4+ migrarem para sítios Ce dentro da superfície, devido a maior quantidade de coordenações Zr-O e a redução da tensão criada pelos Ce3+.
Cerium oxides (CeOx, 3/2≤ x ≤ 2) based catalysts are employed in several reactions with high economic interest, such as the reaction in three-way-catalysts. It is well know that is possible to improve the ceria catalytic properties, by mixing with zirconium oxide and adding metallic particles over the material surface. Meanwhile, the deposition of Zr atoms over CeO2(111) is little explored although it has already been used for synthesis Ag nanoparticles of controlled size. One of the particularities of the Zr/CeO2(111) systems is to form islands of height between 1,5 and 3,0 Å on the surface of the ceria, which are suggested in the literature to be Zr-O and O-Zr-O layers. However, the nature and magnitudes of interactions between Zr and CeO2 surface are little know, as well as the CeO2 modifications induced by Zr and the mechanisms for Zr oxidation and ZrO2 formation over the surface. Aiming to understand the Zr-CeO2(111) interactions and the ZrO2 formation over the CeO2(111), this mastering project perform a theoretical study of n (1 ≤ n ≤ 4) Zr adatoms absorption over CeO2(111), and the ZrO2 formation over CeO2(111). The charge analysis indicated charge transfer from Zr adatons to the surface together with change in species oxidation state. The Zr oxidize to Zr4+ and interact with surface O2- , where four Ce4+ cations reduce to Ce3+. Energetic analysis pointed out that the process is very stabilizing, more than 10 eV per Zr adatom. With the increase of quantity n of Zr adatoms over the surface, it is observer 4 × n Ce4+ reductions and O2- migrations from inside surface to close the Zr4+, forming ZrO2 aggregates over the surface. The O migration occurs because of two reasons, the O2- interaction with Zr4+ in the agregate is more stabilizer than the interaction of O2- with Ce3+ inside the surface, and the O migration decrease the strain produced bue to the radius of Ce3+ being greater than the Ce4+ radius. In addition, was found a stability trend for Zr4+ to migrate to inside surface Ce sites, due of the more Zr-O coordinations and release of the strain induced by Ce3+.
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Imagawa, Haruo. "Study on Metal Oxide Nanomaterials for Automotive Catalysts." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/158079.

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Mecheri, Christopher. "Sviluppo di un modello orientato al controllo di un catalizzatore trivalente per applicazioni GDI." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14805/.

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I sempre più stringenti vincoli normativi riguardanti le emissioni, richiedono lo sviluppo di modelli in grado stimare on-board le emissioni engine-out e le emissioni a valle del catalizzatore. Per modellare la chimica di un catalizzatore è richiesto un elevato sforzo computazione e questo va in contrapposizione con la necessità di lavorare real-time. La variabile che maggiormente influenza la dinamica del catalizzatore è l'ossigeno in esso contenuto, portando così a definire un modello oxygen storage dominated. Con questa tipologia di modellazione semplificata il catalizzatore viene descritto come un serbatoio di ossigeno con una sua dinamica di riempimento e svuotamento. Le possibili applicazioni su cui il modello potrebbe lavorare sono l’implementazione di una strategia di controllo lambda predittiva per i progetti con singolo brick e la modellazione del titolo a valle del GPF nei progetti con layout a cascata.
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Andrews, Gary Lyndl. "Synthesis and characterization of Ceria with an optimal oxygen storage capacity as potential medium to remove SO2 from flue gas emissions." Thesis, University of Western Cape, 2013. http://hdl.handle.net/11394/3323.

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Magister Philosophiae - MPhil
Due to an increasing demand for energy, alternative renewable energy sources are investigated globally. However fossil fuels are still one of the main energy sources. The combustion of these fuels produces by-products such as SOx, NOx and CO2, which have detrimental effects on the environment and human health. Therefore, effective methods are needed to minimize the pollution and affects that these by-products cause. Catalysts are commonly employed to convert these by-products to less harmful and/or resalable products. Ceria and ceria based materials are good candidates for the removal and conversion of SOx and NOx. Ceria and ceria related materials are most effective as catalysts when they are in the nano-form with good crystallinity and nanoparticles that are uniform. The growth of nanoparticles is preceded by a nucleation process which can occur by solid-state restructuring of a gel or precipitation from a saturated solution. The precipitation method was selected to synthesize Ceria nanoparticles. Synthesis conditions such as temperature, solution type and ageing time and their effect on the physical and chemical forms of the Ceria particles were investigated. The morphology and structural properties were investigated using Scanning Electron Microscopy, X-ray diffraction and Transmission Electron Microscopy. X-ray Photoelectron Spectroscopy was used to investigate the chemical properties. It was found that low temperatures, low base volume and a solvent with a small dielectric constant favor the formation of small crystallites with a relatively large concentration of defects. These defects are desirable since they enhance the catalytic activity of ceria.
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Kolli, T. (Tanja). "Pd/Al2O3 -based automotive exhaust gas catalysts:the effect of BaO and OSC material on NOx reduction." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514280563.

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Abstract The aim of the thesis was to find new information on the effect of BaO and oxygen storage capacity material on NOx reduction. A total of nine different kinds of Pd/Al2O3-based metallic monoliths were studied. Promoters such as oxygen storage capacity material (OSC material in our case Cex-1ZrxO2 mixed oxides) and stabilisers such as barium (BaO) were added into the catalyst alone or together to improve catalyst properties such as catalytic activity, selectivity, and thermal stability. The key aspects in this thesis can be divided into four parts. First, the behaviour of NO reduction and CO as well as C2H4 oxidation over Pd/Al2O3-based catalysts in rich, stoichiometric and lean conditions were studied. Secondly, the effect of BaO and the OSC material in NO reduction was considered. Thirdly, the preparation procedure, i.e. the addition order of BaO, OSC material, and Pd on the catalyst was considered. Finally, the effect of ageing on the behaviour of catalysts was investigated. Several characterization methods (in situ DRIFT, catalytic activity measurements, N2 physisorption, CO chemisorption, dynamic oxygen storage capacity measurements, and X-ray diffraction (XRD)) were utilised to find answers to the behaviour of these catalysts in the studied model reactions. The Rapid Ageing Hot in Laboratory (RAHLAB) method was used to age the catalyst. First, it was demonstrated that the CO and hydrocarbon oxidation and NO reduction reactions over the Pd/Al2O3-based catalyst behave differently. NO reduction and CO and hydrocarbon oxidation reactions were dependent on the reaction conditions and temperatures. Secondly, the effect of OSC and BaO on NO reduction was studied separately. In the case of OSC material, it was observed that the OSC material has an effect on NO reduction as well as on CO and C2H4 oxidation. In the case of BaO, it was observed that BaO has a positive effect on NO reduction as well as CO and C2H4 oxidation especially in rich conditions. Thirdly, the effects of the addition order of OSC and BaO on the catalyst was studied separately. It was shown that these have an effect on NO reduction, especially after ageing. First, on the fresh Pd/Al2O3 catalyst it was observed that the addition order of OSC on the catalyst has not an influence on catalyst performance. The effect of the BaO addition order on the Pd/OSC/Al2O3-based catalyst is found to be insignificant, especially, after the ageing process. Furthermore, it is observed that the effect of RAHLAB ageing was that the catalyst lost its catalytic activity, stability, and selectivity.
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Diatta, Aliou. "Nouveaux matériaux multifonctionnels de type quartz BaXO2 avec X=Zn ou Co." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS123/document.

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Depuis la découverte de la piézoélectricité dans le quartz, les besoins en matériaux efficaces pour des applications technologiques piézoélectriques (PZ) et d’Optiques Non-Linéaires (ONL) ont considérablement augmenté. Les deux propriétés doivent présenter une stabilité thermique élevée dans une large gamme de température. Dans le cadre de ma thèse, les matériaux de type quartz BaXO2 (X=Zn ou Co) ont donc été étudiés car ils cristallisent dans le même groupe d’espace P3121 que le quartz-a l'un des matériaux les plus utilisés, principalement pour ses propriétés de PZ et d’ONL.Nous avons commencé ce travail par le composé BaZnO2 car il présenterait un coefficient de couplage électromécanique K11=35,7% supérieur à celui du quartz. Une étude combinée expériences/théorie a permis de i) caractériser la stabilité chimique et thermique jusqu’à 1273 K, et de ii) déterminer les propriétés diélectriques et vibrationnelles (IR-Raman) du matériau. Les propriétés ONL, calculées par DFT, seraient en outre supérieures à celles du quartz.Dans BaCoO2, le degré d’oxydation +II du Co en symétrie tétraédrique implique un ordre antiferromagnétique à température ambiante (TN =330 K). Associé à la structure type quartz, un couplage piézo-magnétique peut être envisagé. BaCoO2 a été caractérisé structuralement/vibrationnellement (résultats confrontés à la théorie) jusqu’à 1273 K et une capacité de stockage d’oxygène réversible exceptionnelle a pu être mise en évidence dans BaCoO2+x (0 ≤ x ≤ 1) par ATG, spectroscopie Raman et par diffraction de rayons X grâce à une séquence de transition topotactique
Since the discovery of the piezoelectricity in quartz, the need of efficient materials for piezoelectric and non-linear optic technological applications has increased dramatically. Both properties have to exhibit a high thermal stability over a wide temperature range. In my thesis work, the BaXO2 quartz type structure materials (X = Zn or Co) have been studied since they crystallize in the same P3121/P3221 space group than quartz, which is still one of the most widely used minerals mainly due to its piezoelectric properties.We have started this work with the BaZnO2 compound since first-principles-based calculations predicted an electromechanical coupling, k_11=35.7%. Our combined experimental and theoretical study allowed i) to characterize the chemical and thermal stability of BaZnO2 up to 1273 K, and ii) to determine the dielectric and vibrational (IR-Raman) properties of the material. Additionally the non-linear optic responses are predicted to be one order of magnitude higher than those reported for quartz.In BaCoO2, the oxidation state of Co (+II) in a tetrahedral symmetry implies an antiferromagnetic order at room temperature ( T_N=330 K). Associated with the -quartz type structure, a piezo-magnetic coupling can be considered. BaCoO2 was structurally and vibrationally characterized up to 1273 K (as obtained results were confronted to theory) and an exceptional reversible oxygen storage capacity was pointed out in BaCoO_(2+δ )(0 < δ ≤ 1) based on thermogravimetric measurements, Raman spectroscopy and X-ray diffraction characterizations. The oxygen insertion/disinsertion mechanism is governed by a topotactic transition sequence
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Mutinda, Samuel I. "Hydrothermal Synthesis of Shape/Size-Controlled Cerium-Based Oxides." Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1378917332.

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Jacquet, Quentin. "Li-rich Li3MO4 model compounds for deciphering capacity and voltage aspects in anionic redox materials." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS332.

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Le réchauffement climatique, provoqué par l’augmentation de la concentration de CO2 dans l’atmosphère, est un problème majeur du 21ème siècle. C’est pourquoi, il est d’une importance capitale de valoriser l’utilisation des énergies renouvelables et des technologies de stockage d’énergie telles que les batteries Li-ion. Suivant ce but, les chercheurs ont mis au point un nouveau matériau d’électrode, le Li-rich NMC, dont l’utilisation permet d’augmenter significativement la capacité des batteries Li-ion grâce à la participation des oxygènes de l’oxyde dans la réaction électrochimique. Cependant, ce nouveau phénomène va de pair avec une hystérésis de potentiel qui empêche la commercialisation du Li-rich NMC. Afin de proposer une solution à l’hystérésis de potentiel tout en continuant à augmenter la capacité des électrodes, des études fondamentales sont nécessaires, notamment: la redox anionique a-t-elle une limite de capacité ? et, quelle est l’origine de l’hystérésis ? Pour répondre à la première question, nous avons conçu des matériaux, de composition chimique A3MO4 (A étant du Li ou Na, et M un mix de Ru, Sb, Nb, Ta ou Ir), ayant une redox anionique exacerbée. Après avoir caractérisé la structure de ces nouveaux matériaux, nous avons étudié leur mécanisme électrochimique et montré que la redox anionique est limitée par la décomposition de l’électrode via formation de O2 ou dissolution. Dans un second temps, par l’étude de deux nouveaux matériaux, Li1.3Ni0.27Ta0.43O2 et Li1.3Mn0.4Ta0.3O2 ayant des hystérésis de potentiel très différentes, nous avons montré le lien entre la redox anionique, la taille de la bande interdite, et l’hystérésis de potentiel
Global warming, due to the increasing CO2 concentration in the atmosphere, is a major issue of the 21th century, hence the need to move towards the use of renewable energies and the development of electrical storage devices, such as Li-ion batteries. Along that line, a new electrode material called Li-rich NMCs have been developed, having higher capacity, 290 mAh/g, than commercial materials, like LiCoO2 (150 mAh/g), thanks to participation of oxygen anions into the redox reaction. This process, called anionic redox, unfortunately comes with voltage hysteresis preventing the commercialization of Li-rich NMC. To alleviate this issue while increasing the capacity, fundamental understanding on anionic redox is needed, specifically concerning two points: is anionic redox limited in terms of capacity? And what is the origin of the voltage hysteresis? In a first part, with the aim to assess the limit of anionic redox capacity, we designed new compounds, having enhanced oxygen oxidation behavior, belonging to the A3MO4 family (A being Li or Na and with M a mix of Ru, Ir, Nb, Sb or Ta). We performed their synthesis, deeply characterized their structure, and, by studying their charge compensation mechanism, we showed that anionic redox is always limited by either O2 release or metal dissolution. In a second part, we designed two new materials, Li1.3Ni0.27Ta0.43O2 and Li1.3Mn0.4Ta0.3O2, having different voltage hysteresis, in order to identify the origin of this phenomenon. Coupling spectroscopic techniques with theoretical calculations, we suggest that the electronic structure, namely the size of the charge transfer band gap, plays a decisive role in voltage hysteresis
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Ferris, Anaïs. "Structuration de collecteurs de courant d'or pour la réalisation de micro-supercondensateurs à base d'oxyde de ruthénium." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30022/document.

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Depuis une dizaine d'années, on observe un développement de l'électronique embarquée intégrée à la plupart des objets que nous utilisons au quotidien. Il s'agit maintenant de les interconnecter en créant des réseaux embarqués connectés tels que les réseaux de capteurs autonomes sans fils. La miniaturisation des composants permet d'envisager une autonomie énergétique de ces réseaux composés de capteurs, récupérateurs d'énergie et de micro-batteries. Cependant la faible durée de vie des batteries et leur puissance limitée sont problématiques pour de telles applications. Les micro-supercondensateurs représentent une alternative pertinente pour la gestion de l'énergie dans les systèmes embarqués, notamment grâce à leur durée de vie très élevée. L'objectif de cette thèse concerne l'optimisation des performances de ces dispositifs en termes de densité de puissance et d'énergie. La capacité du supercondensateur étant proportionnelle à la surface électrochimiquement active des électrodes, nous nous sommes donc intéressés à la structuration de collecteurs de courant en or pour optimiser les performances des micro-supercondensateurs à base d'oxyde de ruthénium. Nous avons sélectionné deux principales techniques pour fabriquer une structure tridimensionnelle de l'or. Dans un premier temps, le dépôt physique d'or par évaporation à angle oblique (OAD) nous a permis de réaliser un substrat colonnaire suivi d'un dépôt d'oxyde de ruthénium. Dans un deuxième temps, nous avons mis en place un dépôt électrochimique d'or avec un modèle dynamique à bulles d'hydrogène. Cette technique permet la fabrication d'une structure d'or en trois dimensions par le biais d'un dépôt d'or réalisé simultanément avec une évolution d'hydrogène. L'électrodéposition de l'oxyde de ruthénium sur cette structure poreuse a montré une très bonne compatibilité notamment en terme d'homogénéité du dépôt, une forte capacité à faible vitesse de balayage (> 3 F/cm2) et une bonne cyclabilité. Pour tester les performances de ces électrodes, nous avons réalisé un dispositif complet en configuration empilée présentant de bonnes caractéristiques. Cette technologie de fabrication a pu par ailleurs être transférée à la micro-échelle pour des dispositifs planaires à l'aide de procédés de photolithographie sur électrodes interdigitées
The increasing importance of portable and wearable electronics as well as embedded wireless sensor networks has made energy autonomy a critical issue. Micro-energy autonomy solutions based on the combination of energy harvesting and storage may play a decisive role. However, the short lifetime of micro-batteries is problematic. Micro-supercapacitors are a promising solution in terms of energy storage for embedded systems on the account of their important lifetime. In this work we have focused on the optimization of the performances of micro-supercapacitors in terms of energy and power density. As the capacitance is directly related to the accessible surface area of the electrodes, we have investigated the structuration of the current collectors in order to improve the performances of ruthenium oxide-based micro-supercapacitors. Two mains technics have been studied to obtain three dimensional structures. In a first phase, the oblique angle physical vapor deposition (OAD) has been investigated to fabricate a columnar gold structure, subsequently covered by an electrochemical ruthenium oxide. In a second phase, a highly porous gold architecture has been studied using electrodeposition via a hydrogen bubbles dynamic template. The ruthenium oxide electrodeposited on the resulting mesoporous gold structure shows good compatibility, in terms of homogeneous deposition, with a significant capacitance at slow rate (> 3F.cm-2) and an important cyclability. As proof of concept, a device has been designed in a stack configuration with good performances. Moreover, the technology finalized for electrodes fabrication has been transferred to the micro-scale on planar interdigitated devices using a suitable photolithography process
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Brousse, Kevin. "Intégration de micro-supercondensateurs à hautes performances sur puce de silicium et substrats flexibles." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30090/document.

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Le développement de l'internet des objets au service des " Smart Cities " requière des sources d'énergie miniaturisées. Ces travaux concernent la préparation de micro- supercondensateurs à hautes performances par voies sèches. Des films minces de carbure de titane ont été déposés sur wafer de silicium par pulvérisation, puis convertis par chloration partielle en films de carbone dérivé de carbure microporeux adhérents. 205 mF.cm-2 / 410 F.cm-3 ont été délivrés en milieu 1M H2SO4, et 170 F.cm-3 dans un mélange de liquide ionique et d'acétonitrile en contrôlant la taille des micropores. Les micro-supercondensateurs préparés sur wafer par cette voie, compatible avec les techniques de microfabrication utilisées dans l'industrie des semi-conducteurs, surpassent les performances des micro-supercondensateurs sur puce rapportées jusqu'alors. Enfin, l'écriture laser d'oxydes commerciaux sur polyimide s'est avérée prometteuse pour la préparation de micro-supercondensateurs flexibles
The development of the internet of things, serving the concept of Smart Cities, demands miniaturized energy storage devices. Electrochemical double layer capacitors (or so called EDLCs) are a good candidate as they can handle fast charge and discharge over 1,000,000 cycles. This work focuses on the preparation of high performance micro- supercapacitors using non wet processing routes. Titanium carbide (TiC) thin films were first deposited on silicon wafer by non-reactive DC magnetron sputtering. The deposition parameters, such as pressure and temperature, were optimized to prepare dense and thick TiC films. Then, microporous carbide-derived carbon (CDC) films with sub-nanometer pore diameters were obtained by removing the metallic atoms of the TiC films under chlorine atmosphere. Partial chlorination led to strongly adherent TiC-CDC films which could be used as electrode in aqueous electrolyte. Capacitance values of 205 mF.cm-2 / 410 F.cm-3 were delivered in 1M H2SO4, and were stable over 10,000 cycles. In order to increase the energy density of the on-chip electrodes, the pore sizes were increased to accommodate the larger ions of organic electrolytes, by performing chlorination at higher temperatures. The 700°C chlorinated TiC-CDC electrodes delivered up to 72 mF.cm-2 within a 3 V potential window in an ionic liquid / acetonitrile mixture. Another strategy consisted in the grafting of anthraquinone (AQ) molecules, which brought additional faradic contribution to the capacitive current. Electrochemical grafting by pulsed chronoamperometry allowed to double the TiC-CDC capacitance in aqueous electrolyte (1M KOH). On-chip CDC-based micro-supercapacitors were successfully prepared via reactive ion etching/ inductive coupled plasma procedure followed by chlorination. This non-wet processing route is fully compatible with the microfabrication techniques used in the semi-conductor industry, and the as-prepared micro-devices outperforms the current state of art of on-chip micro-supercapacitors. Aside, the preparation of flexible micro-supercapacitors was achieved via direct laser-writing, which provided a facile and scalable engineering with low cost. Ruthenium oxide (RuO2)-based interdigitated electrodes were obtained from laser-writing of a commercial RuO2.xH2O / cellulose acetate mixture spin-coated onto KaptonTM. Capacitance values of ~30 mF.cm-2 were recorded in 1M H2SO4 for the flexible device. This work open the way for the design of high performance micro-devices at a large scale
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Book chapters on the topic "Oxygen storage capacity"

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DUPREZ, DANIEL, and CLAUDE DESCORME. "OXYGEN STORAGE/REDOX CAPACITY AND RELATED PHENOMENA ON CERIA-BASED CATALYSTS." In Catalysis by Ceria and Related Materials, 243–80. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949654_0007.

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Boaro, Marta, Carla de Leitenburg, Giuliano Dolcetti, and Alessandro Trovarelli. "Effect of sulfur on the oxygen storage/release capacity of Rh/CeO2." In Studies in Surface Science and Catalysis, 1349–54. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80387-0.

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"Heat Storage Media Based on Composites ‘”Silica Gel-Crystalline Hydrate”." In Polymer-Inorganic Nanostructured Composites Based on Amorphous Silica, Layered Silicates, and Polyionenes, 100–118. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-7998-9728-6.ch006.

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In this chapter, the authors present results of a study of the composite sorbents ‘silica gel – crystalline hydrate' synthesized by sol – gel method. The sorption capacity of the composites ‘silica gel – sodium sulphate' is stated to exceed noticeably the linear superposition of the sorption capacity of mechanical mixture of the silica gel and salt. The composites composition and structure were studied by IR-spectroscopy and wide-angle X-ray scattering. The changing of adsorption properties of crystalline salts at their distribution in silicon oxygen matrix is stated to result from dispersion up to nanoscale. The experimental setup for effectiveness tests of synthesized composite adsorbents is developed. The correlation of their composition, structure, water adsorption kinetic, and operating characteristic as heat storage material is revealed. The heat storage capacity is stated to be at least 0.36 kWh/kg (258 kWh/m3).
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Guilhaume, N., and M. Primet. "Oxygen storage capacity in Perovskite-related oxides : The role of over- stoichiometric oxygen in three-way catalysis." In Catalysis and Automotive Pollution Control IV, Proceedings of the Fourth International Symposium (CAPoC4), 581–89. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)80913-0.

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Taha, R., D. Duprez, N. Mouaddib-Moral, and C. Gauthier. "Oxygen Storage Capacity of three-way catalysts : a global test for catalyst deactivation." In Catalysis and Automotive Pollution Control IV, Proceedings of the Fourth International Symposium (CAPoC4), 549–58. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)80910-5.

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Finocchio, Elisabetta, Marco Daturi, Claude Binet, Jean Claude Lavalley, Fabienne Flly, Vincent Perrichon, Hilario Vidal, Jan Kaspar, Mauro Graziani, and Gilbert Blanchard. "Oxygen storage capacity improvement using CeO2-ZrO2 mixed oxides in three way catalysts." In Science and Technology in Catalysis 1998, Proceedings of the Third Tokyo Conference on Advanced Catalytic Science and Technology, 257–62. Elsevier, 1999. http://dx.doi.org/10.1016/s0167-2991(99)80076-7.

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Martin, D., R. Taha, and D. Duprez. "Effects of sintering and of additives on the oxygen storage capacity of PtRh catalysts." In Catalysis and Automotive Pollution Control III, Proceedings of the Third International Symposium CAPoC 3, 801–11. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81476-x.

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Yadav, Nisha, and Vivek Mishra. "Catalytic Applications of Cerium-based Materials." In Cerium-Based Materials: Synthesis, Properties and Applications, 30–69. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815080087123010005.

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This chapter pivots on the employment of Ce-based catalysts in numerous catalytic applications glancing at the foremost commercial technologies due to their high abundance in the earth’s crust. Ceria in essence to their proficiency to harmonize Ce (III) & Ce (IV)-oxidation states depending on oxygen availability, which is known as oxygen-storage capacity, is at the heart of the potentiality of Ce-based materials to exemplify as a catalyst in numerous reactions. Ceria being one of the most auspicious materials in use since 1980 onwards, has strongly dilated to affect several processes for chemical transformations by and large for energy and environmental applications. In this chapter, we will review some of the ingrained applications of Ce-based catalysts and, we will try to display a brief rundown of emerging technologies in this ongoing field to encourage further reading.
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Wang, C. Y. "Changes in Oxygen Radical Absorbance Capacity during Storage of Heat-Treated Fresh-Cut Broccoli, Kale and Peppers." In Integrated View of Fruit & Vegetable Quality, 163–78. CRC Press, 2018. http://dx.doi.org/10.1201/9781351073769-22.

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Rajashekaraiah, Vani, Carl Hsieh, and Masannagari Pallavi. "Modulations in Oxidative Stress of Erythrocytes during Bacterial and Viral Infections." In Erythrocyte - A Peripheral Biomarker For Infection and Inflammation. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98236.

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Oxidative stress (OS) occurs when the generation of free radicals and reactive oxygen species (ROS) overwhelms the antioxidant capacity. OS causes storage lesions which can be defined as a series of biochemical and biomechanical changes. Erythrocytes are constantly exposed to OS due to the presence of ROS, which are countered by the endogenous antioxidant system. Various irreversible changes that occur include fragmentation and aggregation of proteins and lipids. The changes in proteins, lipids and antioxidant capacity are used as OS biomarkers to assess the efficacy of the erythrocytes, post oxidative insult. Aging of erythrocytes is also associated with the changes in its physical, biochemical and physiological properties and OS causes its rapid aging. Bacterial and viral infections also cause OS which alters the erythrocytes’ antioxidant capacity. These modulations in its microenvironment are both beneficial in terms of protection against invading microorganisms as well as harmful to the erythrocytes, causing damage to surrounding cells and tissues. Thus, OS biomarkers can be used to gain insights into the effects of bacterial and viral infections on the erythrocyte microenvironment.
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Conference papers on the topic "Oxygen storage capacity"

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Tanaka, Hirohisa, and Mari Yamamoto. "Improvement in Oxygen Storage Capacity." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1996. http://dx.doi.org/10.4271/960794.

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Ingram, Grant A., and Gopichandra Surnilla. "On-line Oxygen Storage Capacity Estimation of a Catalyst." In SAE 2003 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-1000.

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Yamada, Koji, Hirohisa Tanaka, and Mari Yamamoto. "Oxygen Storage Capacity on Cerium Oxide - Precious Metal System." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/970464.

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Asik, J. R., R. Farkas, R. Beier, and G. M. Meyer. "Closed Loop Measurement of NOx Storage Capacity and Oxygen Storage Capacity of a Lean NOx Trap." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1999. http://dx.doi.org/10.4271/1999-01-1283.

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Tanaka, Hirohisa, Hirotoshi Fujikawa, and Ichiro Takahashi. "Excellent Oxygen Storage Capacity of Perovskite-PD Three way Catalysts." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/950256.

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Matsuhisa, Yuji, Masashi Taniguchi, Mari Uenishi, Isao Tan, Hirohisa Tanaka, Satoshi Matsueda, Keiichi Narita, Akimasa Hirai, and Mareo Kimura. "Improvement of the Oxygen-Storage Capacity of an Intelligent Catalyst." In 2008 SAE International Powertrains, Fuels and Lubricants Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2008. http://dx.doi.org/10.4271/2008-01-1644.

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Hepburn, Jeffrey S., and Haren S. Gandhi. "The Relationship Between Catalyst Hydrocarbon Conversion Efficiency and Oxygen Storage Capacity." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/920831.

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Theis, Joseph R. "An Engine Test to Measure the Oxygen Storage Capacity of a Catalyst." In 1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1996. http://dx.doi.org/10.4271/961900.

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Smedler, Gudmund, Sören Eriksson, Magnus Lindblad, Hans Bernler, Staffan Lundgren, and Edward Jobson. "Deterioration of Three-Way Automotive Catalysts, Part II - Oxygen Storage Capacity at Exhaust Conditions." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/930944.

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Wang, Le Yi, Yong-Wha Kim, and Jing Sun. "Prediction of Oxygen Storage Capacity and Stored NOx by HEGO Sensors for Improved LNT Control Strategies." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32158.

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In the absence of on-line emission measurements, the control of lean burn engine aftertreatment system must be implemented by using models of feedgas emissions and the aftertreatment subsystems, together with measured variables such as mass air flow rate, feedgas and tailpipe relative air-to-fuel ratios, etc. In particular, accurate estimation of stored oxygen and NOx in the LNT is of critical importance. When the ambient conditions (such as humidity, LNT brick temperature, and sulfur poisoning) change or the engine components age, oxygen storage capacity and NOx amount in the LNT vary significantly, and the performance of the control system that relies on these variables may deteriorate if the accuracy of the estimate deteriorates with the change in hardware. In this paper, we show that voltage trajectories of a tailpipe HEGO sensor can provide sufficient information to predict oxygen capacity during storage phase and stored NOx during purge phase of an lean NOx trap (LNT). This result can be used to provide accurate prediction of the termination time of purge operation, leading to improved control strategies for LNT operation. This finding also indicates that more expensive UEGO sensors can be avoided without tangible performance penalty on LNT control.
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Reports on the topic "Oxygen storage capacity"

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Patil, Bhimanagouda S., Ron Porat, G. K. Jayaprakasha, and K. N. C. Murthy. Optimization of Postharvest Storage Conditions to Maintain Fruit Quality and Health Maintaining Properties of Grapefruit. United States Department of Agriculture, January 2010. http://dx.doi.org/10.32747/2010.7613879.bard.

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Antioxidant activity of fruits is gaining wide interest among consumers due to its importance in counteracting oxidative stress, free radicals and preventing DNA damage. Oxygen radical absorbance capacity (ORAC) assay is one of the commonly used assays to measure the antioxidant activity, which is based on hydrogen atom transfer mechanism. Furocoumarins present in grapefruit are reported to have antiproliferative activity, induce GST activity, inhibit biofilm formation and increase bioavailability of drugs. In the present project ORAC values were measured of Star Ruby grapefruit undergone ethylene degreening treatment, cold storage and temperature conditioning treatment, and modified atmosphere packaging which were stored at different temperatures for prolonged period. In addition, furocoumarins were quantified in Star Ruby grapefruits from cold storage and conditioning experiment conducted in Israel. Conditioning treatment is practiced prior cold storage to reduce chilling injury in grapefruits during cold storage for prolonged period. Levels of 6,7-dihyrdoxy bergamottin decreased during storage period in all three treatments.
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