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Rozprawy doktorskie na temat „Direct plating”

Autor: Grafiati
Data publikacji: 3 czerwca 2025
Data aktualizacji: 31 lipca 2025

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1

Mandich, Nenad V. "Mechanisms of chromium deposition and dissolution under direct and pulse reverse plating conditions." Thesis, Aston University, 1996. http://publications.aston.ac.uk/15349/.

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Baths containing sulphuric acid as catalyst and others with selected secondary catalysts (methane sulphonic acid - MSA, SeO2, a KBrO3/KIO3 mixture, indium, uranium and commercial high speed catalysts (HEEF-25 and HEEF-405)) were studied. The secondary catalysts influenced CCE, brightness and cracking. Chromium deposition mechanisms were studied in Part II using potentiostatic and potentiodynamic electroanalytical techniques under stationary and hydrodynamic conditions. Sulphuric acid as a primary catalyst and MSA, HEEF-25, HEEF-405 and sulphosalycilic acid as co-catalysts were explored for dif
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Miller, Alexander T. "Direct Electroless Copper Plating on Glass Mediated by Solution-Phase Deposition of Nucleation and Adhesion Promoters." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1436985990.

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Briggs, Whitney. "Evaluation and optimization of quantitative analysis methods for Clostridium perfringens detection in broiler intestinal samples to use with necrotic enteritis challenge models." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587491319889086.

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Dematos, Jean. "Characterization of Organic Additives Free Copper Electrodeposits, carried out in Sulfuric Acid Medium, Under Direct or Pulsed Current : Cathodic and Anodic Phenomena Understanding." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCD077.

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L'utilisation d'additifs organiques est une pratique courante pour améliorer les propriétés des couches de cuivre élaborées à partir d'un bain électrolytique en milieu sulfate. En particulier, le pouvoir nivelant et la brillance peuvent être fortement améliorés. Mais cette pratique n'est pas sans inconvénients, avec des coûts élevés, des risques de rupture d'approvisionnement et des risques pour la santé pour et l’environnement. De plus, la gestion des anodes solubles peut s’avérer délicate.Pour éviter les inconvénients mentionnés ci-dessus, ce travail propose de supprimer les additifs organiq
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5

Borges, Jairo. "Desenvolvimento de catalisadores nanoparticulados do tipo Pt-M1-M2(M1 e M2 = Sn e Re) para aplicação em células a combustível direta de etanol." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-13102008-171320/.

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Neste trabalho foi investigada a eletrooxidação de etanol sobre eletrodos nanoparticulados binários Pt-M1 (M1 = Sn ou Re) e ternários Pt-M1-M2 (M1 e M2 = Sn e Re) suportados em carbono. Estes materiais foram preparados pelo método da redução por álcool e foram caracterizados por difração de raios-X e microscopia eletrônica de varredura associada a EDX. Os eletrodos foram montados utilizando-se a técnica de camada ultrafina. Os resultados eletroquímicos mostraram que a adição dos diferentes metais à platina aumentou a atividade catalítica tanto dos eletrodos binários quanto dos ternários. Os
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6

Coleman, Nicholas Richard Boldero. "Direct liquid crystal templating of mesoporous silica and platinum." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302011.

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Hogarth, Martin P. "The development of the direct methanol fuel cell." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295055.

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Lin, Zhan. "Platinum and Platinum Alloy-Carbon Nanofiber Composites for Use as Electrodes in Direct Methanol Fuel Cells." NCSU, 2010. http://www.lib.ncsu.edu/theses/available/etd-03312010-171722/.

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In response to the energy needs of modern society and emerging ecological concerns, the pursuit of novel, low-cost, and environmentally friendly energy conversion and storage systems has raised significant interest. Among various energy conversion and storage systems, fuel cells have become a primary research focus since they convert chemical energy directly into electrical energy with high efficiency and low pollutant emissions. For example, direct methanol fuel cells (DMFCs), which supply the electrical energy by converting methanol to energy, are an ideal fuel cell system for applications i
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9

Dubau, Laetitia. "Electrocatalyseurs platine-ruthénium nanodispersés pour une pile à combustion directe de méthanol." Poitiers, 2002. http://www.theses.fr/2002POIT2258.

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Ce travail s'inscrit dans le cadre du développement de catalyseurs nanostructurés actifs pour l'électrooxydation du méthanol. Le platine est indispensable mais engendre une importante limitation cinétique, conséquence de la présence de l'espèce poison COads à sa surface. Associé au platine, le ruthénium diminue cet empoisonnement. La méthode colloi͏̈dale a permis de synthétiser deux types de catalyseur platine-ruthénium avec une taille de particules de l'ordre de 2 nm. Le premier, mélange de particules de platine et de ruthénium s'est avéré plus actif pour l'oxydation du CO et du méthanol que
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10

Corradini, Patricia Gon. "Investigação de nanocatalisadores de platina-terras raras suportados em carbono para células a combustível de etanol direto." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-19102017-083644/.

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Sistemas de células a combustível alimentadas por etanol (DEFC - Direct Ethanol Fuel Cell) são vistos como candidatos para ajudar preencher a lacuna entre a demanda e oferta de energia elétrica. Entretanto, as DEFC ainda não apresentam desempenho tão elevado, que incentivem a comercialização. Um dos principais esforços para elevar o desempenho é obter catalisadores anódicos mais eletroativos e estáveis para reação de oxidação de etanol (ROE). Neste trabalho, visou-se obter e avaliar catalisadores Pt-Sn-Terras raras (La, Ce, Pr e Eu) para ROE. Os catalisadores foram sintetizados a partir de alg
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11

Napporn, Têko Wilhelmin. "Pile au méthanol à oxydation directe : étude d'électrocatalyseurs dispersés dans un polymère conducteur." Poitiers, 1997. http://www.theses.fr/1997POIT2252.

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La realisation d'une pile au methanol a oxydation directe necessite une etude fondamentale permettant la comprehension des reactions qui se produisent aux electrodes. La reaction d'oxydation du methanol sur le platine en milieu acide est souvent incomplete et implique la formation d'intermediaires fortement adsorbes comme le co#a#d#s. Cette espece est consideree comme le poison des catalyseurs a base de platine utilises a l'anode. Une etude de l'oxydation de ch#3oh et de ses derives par oxydation (hcho, hcooh et co) sur le platine en milieu acide a ete realisee par la microbalance electrochimi
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12

Khumkoa, Sakhob. "Beitrag zur Lösung von Plating-Problemen während der Direktreduktion von Eisenerzen." Aachen Shaker, 2009. http://d-nb.info/996836780/04.

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13

Ntlauzana, Asanda. "Electrochemical investigation of platinum nanoparticles supported on carbon nanotubes as cathode electrocatalysts for direct methanol fuel cell." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2790_1307429626.

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<p>The particles of the Pt metal were well dispersed on carbon nanotubes when EG was used and in isopropanol poor dispersion was observed and no further investigation was done on them. The platinum wt% on the supports observed from EDS was 21.8, 19.10 and 16.74wt% for Pt/EMWCNT, Pt/LPGCNT and Pt/ commercial CNT respectively. Pt/LPGMWCNT showed high electro-catalytic activity of 2.48 mA and active surface area of 76 m2/g, toward oxygen reduction, observed from cyclic voltammogram in iv sulfuric acid. Pt/LPGMWCNT also showed better tolerance toward methanol, however it was not highly active towa
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14

Bauer, Alexander Günter. "Direct methanol fuel cell with extended reaction zone anode : PtRu and PtRuMo supported on fibrous carbon." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/913.

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The direct methanol fuel cell (DMFC) is considered to be a promising power source for portable electronic applications and transportation. At present there are several challenges that need to be addressed before the widespread commercialization of the DMFC technology can be implemented. The methanol electro oxidation reaction is sluggish, mainly due to the strong adsorption of the reaction intermediate carbon monoxide on platinum. Further, methanol crosses over to the cathode, which decreases the fuel utilization and causes cathode catalyst poisoning. Another issue is the accumulation of the
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15

Belgued, Mohamed. "Essais d'homologation directe du méthane par chimisorption sur ruthénium et sur platine et hydrogénation ultérieure." Nancy 1, 1992. http://www.theses.fr/1992NAN10047.

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La conversion directe du méthane en des espèces industriellement intéressantes est actuellement l'objet de nombreuses recherches. La plupart d'entre elles utilisent de l'oxygène et présentent donc l'inconvénient de transformer le méthane en dioxyde de carbone. Ce mémoire apporte la démonstration de ce que la chimisorption du méthane sur le ruthénium ou sur le platine, à condition d'être pratiquée dans de bonnes conditions, conduit à l'accumulation superficielle de matière hydrocarbonée appauvrie en hydrogène et dont l'hydrogénation ulterieure fournit des alcanes pouvant contenir jusqu’à huit a
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16

Hussein, Hamad. "Réduction des NOx par le propène sur des catalyseurs obtenus par incorporation directe de H3PW12O40 et Pt dans des silices mésoporeuses de type MSU et SBA-15." Mulhouse, 2006. http://www.theses.fr/2006MULH0829.

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Les oxydes d'azote NOx (NO + NO2), formés lors des procédés de combustion figurent parmi les polluants de l'air les plus nocifs. Divers procédés ont été développés pour limiter leur formation, en particulier, la réduction catalytique sélective (SCR). De nombreux catalyseurs contenant des métaux de transition ou nobles déposés sur des oxydes ou à base de zéolithes échangées ont été testés avec succès en présence d'agents réducteurs. Les hétéropolyacides (HPA) tels que H3PW12O40 (HPW), connus pour leur forte acidité, et leur capacité à adsorber des molécules polaires, méritent d'être testés pour
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17

Celik, Caglar. "Carbon Supported And Surfactant Stabilized Metal Nanoparticle Catalysts For Direct Methanol Fuel Cells." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606368/index.pdf.

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ABSTRACT CARBON SUPPORTED AND SURFACTANT STABILIZED METAL NANOPARTICLE CATALYSTS FOR DIRECT METHANOL FUEL CELLS &Ccedil<br>elik, &Ccedil<br>aglar M.S., Department of Chemistry Supervisor: Assoc. Prof. Dr. G&uuml<br>ls&uuml<br>n G&ouml<br>kaga&ccedil<br>August 2005, 72 pages Carbon supported surfactant, such as 1-decanethiol and octadecanethiol, stabilized platinum and platinum/ruthenium species have been prepared recently. In this thesis, for the first time, 1-hexanethiol has been used as an organic stabilizer for the preparation of carbon supported platinum and platinum/ruthenium na
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18

Varela, Júnior Jaldyr de Jesus Gomes. "DESEMPENHO DE ELETRODOS Pt/C, Pt3Cr/C E PtCr/C PARA APLICAÇÕES EM CÁTODOS DE CÉLULAS A COMBUSTÍVEL DE METANOL DIRETO." Universidade Federal do Maranhão, 2006. http://tedebc.ufma.br:8080/jspui/handle/tede/928.

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Made available in DSpace on 2016-08-19T12:56:38Z (GMT). No. of bitstreams: 1 Jaldyr de Jesus.pdf: 960775 bytes, checksum: 15b1d54e03bab9da8818d65bfa95a1e8 (MD5) Previous issue date: 2006-07-14<br>This work presents oxygem reduction reaction (ORR) studies on platinum (Pt/C) and platinum-chromium alloys containing 50% (PtCr/C) or 70% in chromium (Pt3Cr) dispersed on high surface area, in acid aqueous solutions with and without metanol, with cyclic voltammetry, chronoamperometry and rotating disk electrode techniques. Electrochemical measurements have been also performed in a direct methanol
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19

Thobeka, Adonisi. "Electrochemical characterization of platinum based catalysts for fuel cell applications." Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/3812.

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Magister Scientiae - MSc<br>Fuel cells convert chemical energy from a fuel into electricity through chemical reaction with oxygen. This possesses some challenges like slow oxygen reduction reaction (ORR), overpotential, and methanol fuel cross over in a direct methanol fuel cell (DMFC). These challenges cause inefficiency and use of higher amounts of the expensive platinum catalyst.Several binary catalysts with better ORR activity have been reported. In this study we investigate the best catalyst with better ORR and MOR performances and lower over-potentials for PEMFC and DMFC applications b
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20

Valente, Damien. "Soudure directe silicium sur silicium : étude de procédés de passivation de l'interface." Thesis, Tours, 2011. http://www.theses.fr/2011TOUR4048/document.

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Ces travaux de thèse accompagnent le développement de nouvelles architectures d’interrupteurs monolithiques bidirectionnels en courant et en tension. L’une des voies technologiques proposées consiste à contrôler les propriétés électriques de l’interface de soudure Si-Si. Nous avons mis en évidence la nature complexe de l’activité électrique de l’interface avec l’existence d’un continuum d’états d’énergie au caractère recombinant. L’intégration d’une telle brique technologique nécessite alors la maîtrise de la passivation/décoration de l’interface par diffusion d’impuretés. La passivation des é
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Sen, Fatih. "The Preparation And Analysis Of New Carbon Supported Pt And Pt+second Metal Nanoparticles Catalysts For Direct Methanol Fuel Cells." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614728/index.pdf.

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In this thesis, firstly, carbon-supported platinum nanoparticle catalysts have been prepared by using PtCl4 and H2PtCl6 as starting materials and 1-hexanethiol, and tert-octanethiol, as surfactants for the first time. Secondly, these prepared catalysts were heated to 200 &deg<br>C, 300 &deg<br>C, and 400 &deg<br>C for 4 h under argon gas. Lastly, PtRu/C catalysts, which have different atomic percent ratios of Pt and Ru (Pt/Ru: 0.8, 2.1 and 3.5), were prepared using PtCl4 and RuCl3 as starting materials and tert-octanethiol as a surfactant. Each was characterized by X-ray diffraction, transmis
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Javu, Bulelwa Patricia. "Multi-component Platinum Group Metals for the methanol electro-oxidation process." University of the Western Cape, 2018. http://hdl.handle.net/11394/6571.

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>Magister Scientiae - MSc<br>The purpose of this study was to develop a high performance-lower cost catalyst to be applied in Direct Methanol Fuel Cells (DMFC). The study also aimed to prepare plurimetallic supported platinum (Pt), platinum-ruthenium (PtRu), platinum-ruthenium-vanadium (PtRuV) and platinum ruthenium-vanadium-iron (PtRuVFe) upon multi-walled carbon nanotube (MWCNT) as well as upon multiwalled carbon nanotube-titanium oxide (MWCNT/TiO2) supports. Platinum is very active but prone to poisoning by carbon monoxide (CO), which may be present in the fuel used in fuel cells. Th
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ANTONIASSI, RODOLFO M. "Desempenho elétrico e distribuição dos produtos da célula a combustível com etanol direto utilizando Pt/C, PtSn/C(liga) e PtSnO2/C como eletrocatalisadores anódicos." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10515.

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Williams, Mario. "Characterization of platinum-group metal nanophase electrocatalysts employed in the direct methanol fuel cell and solid-polymer electrolyte electrolyser." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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Vigier, Fabrice. "Développement d'électrocatalyseurs pour l'oxydation directe de l'éthanol dans une pile à combustible à membrane (PEMFC)." Poitiers, 2002. http://www.theses.fr/2002POIT2301.

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Verjulio-Silva, Roberto Willyan Ramon. "Preparação e caracterização de eletrocatalisadores PtRu/C e PtSn/C via redução química por ácido cítrico para oxidação direta de alcoóis em células a combustível tipo PEM." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-02042012-134215/.

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Neste trabalho, os sistemas de eletrocatalisadores platina-rutênio (PtRu/C) e platina-estanho (PtSn/C) suportados em carbono de alta área superficial XC72R (Cabot) foram preparados pela redução química de precursores metálicos em solução usando o ácido cítrico como agente redutor. Os eletrocatalisadores foram preparados em diferentes valores de pH, com o objetivo de obter as condições de sínteses mais otimizadas para cada um dos sistemas preparados. O método otimizado mostrou-se eficiente na redução e ancoragem de todos os metais presente em solução, sendo possível preparar tanto catalisadores
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27

Vrabec, Tina L. "Direct Current Block of Peripheral Nerve: Electrode and Waveform Development." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1448989101.

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Marques, dos Anjos Daniela. "Oxydation électrocatalytique de l'éthanol sur des alliages plurimétalliques à base de platine : application à la pile à combustible à oxydation directe (DEFC)." Poitiers, 2007. http://www.theses.fr/2007POIT2316.

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SILVA, DIONISIO F. da. "Preparação de eletrocatalisadores PtRu/C utilizando radiação gama para aplicação como ânodo na oxidação direta de metanol." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11413.

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Handforth, Darren Richard. "Development of selective pre-concentration methodology of some of the platinum-group metals in acidic solutions, followed by their direct determination by ICP-OES." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/17220.

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Includes bibliographical references.<br>The trace analysis of the platinum-group metals in complex, severely interfering matrices, such as industrial effluent, has been the focus of much research in_the past forty years. However, despite the greater availability of much improved instrumentation, such as ICP-OES, NAA and XRF, most analytical techniques currently employed for the determination of the platinum-group metals require selective sample preparation that ensures enrichment of the individual platinum-group metals at the trace and ultra trace level, along with simultaneous matrix removal,
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31

Ozturk, Zafer. "Carbon Supported Platinum-palladium Catalysts For Methanol And Ethanol Oxidation Reactions." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613008/index.pdf.

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In this work, two groups of carbon supported Pt-Pd catalysts have been prepared in order to investigate the effect of Pd, as a second metal, and surfactants on the catalytic activity towards methanol and ethanol oxidation reactions used in the direct methanol and ethanol fuel cells. In the first group (group a), 1- hexanethiol was used as a stabilizing agent while in the second group (group b), 1,1 dimethyl hexanethiol was utilized. Cyclic voltammetry (CV), chronoamperometry (CA), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS) and X-
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32

Twala, Moses Bongani. "The impact of mission-directed work teams on employee engagement within the platinum industry / Moses B. Twala." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9847.

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Employee engagement is defined as worker’s willingness and ability to contribute to a company’s success, the extent to which employees put in discretionary effort into their work (Kennedy and Daim 2010, Hundley et al., 2005) which explains the researchers approach in assessing the impact of mission-directed work teams towards employee engagement. Lonmin Plc. the third largest producer of platinum registered on both the Johannesburg Stock Exchange (JSE) and London Stock Exchange (LSE) has embarked on integrating its operational activities, with the view of advocating its strategic alignment tow
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RIBEIRO, VILMARIA A. "Preparação de eletrocatalisadores PtRuNi/C pelo método da redução por álcool para aplicação como ânodo na oxidação direta de metanol em células a combustível de eletrólito polimérico sólido." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11680.

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Made available in DSpace on 2014-10-09T12:54:40Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:09:10Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP
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Costa, Marcus Vinicius da. "A REVOLUÇÃO FEDERALISTA (1893-1895): O CONTEXTO PLATINO, AS REDES, OS DISCURSOS E OS PROJETOS POLÍTICOS LIBERAL-FEDERALISTAS." Universidade Federal de Santa Maria, 2006. http://repositorio.ufsm.br/handle/1/9742.

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The changes that are being processed worldwide nowadays, globalization, formation of international state communities, as European Union, South Market, have fostered important changes in the knowledge during the last decades. Several social scientists, from several subjects, have been trying to review their concepts, having as a target to understand this new reality. Thinking about the current integration process, or the integrationist projects in vogue in Latin America, demands a new look over the continent history. It s indispensable to rethink the question round the national-states formation
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ANTONIASSI, RODOLFO M. "Preparação de nanopartículas de platina com diferentes morfologias nos materiais Pt/C e PtSnO2/C para aplicação como ânodo em células a combústível de etanol direto." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/28036.

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Submitted by Pedro Silva Filho (pfsilva@ipen.br) on 2017-11-22T16:42:40Z No. of bitstreams: 0<br>Made available in DSpace on 2017-11-22T16:42:40Z (GMT). No. of bitstreams: 0<br>Neste trabalho foi estudado o efeito da adição de íons haletos (Cl-, Br- e I-) sobre a morfologia das nanopartículas de Pt na produção de catalisadores de Pt/C e PtSnO2/C. Foi desenvolvida uma metodologia de síntese simples capaz de produzir nanopartículas de Pt predominantemente cúbicas com orientação preferencial Pt(100), diretamente suportadas em carbono sem o uso de agentes estabilizantes. Brometo de potássio foi u
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Antoniassi, Rodolfo Molina. "Preparação de nanopartículas de platina com diferentes morfologias nos materiais Pt/C e PtSnO2/C para aplicação como ânodo em células a combústível de etanol direto." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-23102017-160802/.

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Neste trabalho foi estudado o efeito da adição de íons haletos (Cl-, Br- e I-) sobre a morfologia das nanopartículas de Pt na produção de catalisadores de Pt/C e PtSnO2/C. Foi desenvolvida uma metodologia de síntese simples capaz de produzir nanopartículas de Pt predominantemente cúbicas com orientação preferencial Pt(100), diretamente suportadas em carbono sem o uso de agentes estabilizantes. Brometo de potássio foi utilizado como agente direcionador de superfície para obtenção do material preferencialmente orientado. O controle de adição do precursor de Pt e de KBr foi crucial para obter nan
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SILVA, ROBERTO W. R. V. da. "Preparacao e caracterizacao de eletrocatalisadores PtRu/C e PtSn/C via reducao quimica por acido citrico para oxidacao direta de alcoois em celulas a combustivel tipo PEN." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11741.

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Made available in DSpace on 2014-10-09T12:55:18Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:01Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Sen, Selda. "Activity Of Carbon Supported Platinum Nanoparticles Catalysts Toward Methanol Oxidation Reaction: Role Of Metal Precursor And A New Surfactant." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609273/index.pdf.

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In this thesis, carbon supported platinum nanoparticle catalysts were prepared using PtCl4 and H2PtCl6 as starting materials and 1-heptanethiol, tert-nonyl mercaptan, 1-hexadecanethiol, 1-octadecanethiol as surfactants. These new catalysts were employed for methanol oxidation reaction which are used for direct methanol fuel cells. Tert-nonyl mercaptane was used for the first time in this type of reaction and the other surfactants were used for comparison of the catalysts performance. Cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and transmission elec
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Ertan, Salih. "Preparation And Characterization Of Carbon Supported Platinum Nanocatalysts With Different Surfactants For C1 To C3 Alcohol Oxidations." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613623/index.pdf.

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In this thesis, carbon supported platinum nanoparticles have been prepared by using PtCl4 as a starting material and 1-octanethiol, 1-decanethiol, 1-dodecanethiol and 1-hexadecanethiol as surfactants for methanol, ethanol and 2-propanol oxidation reactions. The structure, particle sizes and surface morphologies of the platinum were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM) and transmission electron microscopy (TEM). XRD and TEM results indicate that all prepared catalysts have a face centered cubic structure and are homogeneously dispersed on the carbon support wi
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SILVA, DIONISIO F. da. "Preparacao de eletrocatalisadores PtRu/C e PtSn/C utilizando feixe de eletrons para aplicacao como anodo na oxidacao direta de metanol e etanol em celulas a combustivel de baixa temperatura." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9475.

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Made available in DSpace on 2014-10-09T12:27:08Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:45Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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DIAS, RICARDO R. "Estudo dos eletrocatalisadores de PtSnRh/C+CeOsub(2) preparados pelo método da redução por álcool para oxidação eletroquímica do etanol." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10547.

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Made available in DSpace on 2014-10-09T12:41:45Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:08:41Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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AYOUB, JAMIL M. S. "Preparação de eletrocatalisadores PtSbsub(2)Osub(5).SnOsub(2) suportados em carbono e ATO pelo método da redução por álcool para oxidação eletroquímica do etanol." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10179.

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Made available in DSpace on 2014-10-09T12:35:40Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:55Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Ribeiro, Vilmaria Aparecida. "Preparação de eletrocatalisadores PtRuNi/C pelo método da redução por álcool para aplicação como ânodo na oxidação direta de metanol em células a combustível de eletrolito polimérico sólido." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-18052012-094155/.

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Foi estudada a preparação de eletrocatalisadores PtRuNi/C (nanopartículas PtRuNi suportadas em carbono) pelo método da redução por álcool utilizando H2PtCl6.6H20, RuCl3.1,5H2O e NiCI2.6H2O como fonte de metais, etileno glicol como solvente e agente redutor e Carbón Vulcan XC72R como suporte. Os eletrocatalisadores obtidos foram caracterizados por análise de raios X por energia dispersiva (EDX), difração de raios X (XRD), microscopía eletrônica de transmissão (TEM) e voltametria cíclica (CV). A eletro-oxidação do metanol foi estudada por voltametria cíclica e cronoamperometria visando aplicação
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RIBEIRO, MARIA A. M. "Contribuicao ao estudo do impacto ambiental das pilhas a combustivel de baixa e media temperatura atraves da metodologia Delphi." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9426.

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DRESCH, MAURO A. "Aplicação de catalisadores PtSn/C e membranas Nafion-SiOsub(2) em células a combustível de etanol direto em elevadas temperaturas." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10633.

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Made available in DSpace on 2014-10-09T12:42:37Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:01:33Z (GMT). No. of bitstreams: 0<br>Tese (Doutorado em Tecnologia Nuclear)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Nordmann, Sven Andreas Verfasser], Joachim [Akademischer Betreuer] [Knoch, and Uwe [Akademischer Betreuer] Rau. "Entwicklung eines gekoppelten Photo-voltaik-Elektrolyse-Systems aus einer monolithischen Reihenschaltung siliziumbasierter, rückseitenkontaktierter Solarzellen und einer Platin / Rutheniumoxid-Elektrolysezelle für die direkte Spaltung von Wasser / Sven Andreas Nordmann ; Joachim Knoch, Uwe Rau." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1219968404/34.

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Nordmann, Sven Andreas [Verfasser], Joachim [Akademischer Betreuer] Knoch, and Uwe [Akademischer Betreuer] Rau. "Entwicklung eines gekoppelten Photo-voltaik-Elektrolyse-Systems aus einer monolithischen Reihenschaltung siliziumbasierter, rückseitenkontaktierter Solarzellen und einer Platin / Rutheniumoxid-Elektrolysezelle für die direkte Spaltung von Wasser / Sven Andreas Nordmann ; Joachim Knoch, Uwe Rau." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1219968404/34.

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BRANDALISE, MICHELE. "Preparacao e caracterizacao de eletrocatalisadores PtRu/C, PtBi/C, PtRuBi/C para eletro-oxidacao direta de etanol em celulas a combustivel do tipo PEM utilizando a metodologia da reducao via borohidreto de sodio." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9522.

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PIASENTIN, RICARDO M. "Estudo da eletro-oxidação do etanol utilizando eletrocatalisadores PtPd/C+ATO e PtPdSn/C+ATO preparados via redução por borohidreto de sódio." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10546.

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Kovchar, Jean. "Design, modeling, fabrication and characterization of a micro-device for the study of alternating flow - Application to energy harvesting and conversion." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCD009.

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Cette thèse porte sur l'étude d'écoulements alternés au sein de canaux de dimensions milli- et sub-millimétriques. Ces travaux visent à contribuer à l'optimisation d'une machine miniature (dimensions sub-millimétriques) de récupération et de conversion d'énergie basse température (T &lt; 200 °C) basée sur le principe du cycle de Stirling. Ceci s'inscrit dans le contexte de valorisation de la chaleur fatale encore non exploitée dans de nombreux milieux industriels. Dans les machines de type Stirling, les écoulements du fluide de travail sont alternés. Bien que ces écoulements soient assez bien
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