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Dissertations / Theses on the topic 'Electrodos de platino'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Arán-Ais, Rosa M. "Interfacial reactivity: model surfaces and tailored shape-controlled nanocatalysts." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/70091.

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El trabajo realizado en esta tesis ha seguido dos líneas de investigación principales: por un lado, el uso de electrodos monocristalinos de Pt ha permitido realizar estudios fundamentales de la interfase electrodo│disolución, así como de la electrocatálisis de moléculas orgánicas simples (C2) bifuncionalizadas, y por otro lado, el efecto que la estructura superficial ejerce sobre la electrocatálisis de ciertas reacciones se ha aplicado a la síntesis y caracterización de nanopartículas de Pt con forma controlada. Este campo se ha ampliado al estudio de nanocatalizadores bimetálicos y trimetálic

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2

Myedi, Noluthando. "Electrochemical kinetics and sensing of conjugated dienes in acetonitrile." University of the Western Cape, 2011. http://hdl.handle.net/11394/5424.

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>Magister Scientiae - MSc<br>This thesis focuses on the electroanalysis of some dienes (2-methyl-1.3-butadiene (MBD), tran-1.3-pentadiene (PD), 1.3-cyclohexadiene (CHD) and 3-cyclooctadiene (COD)) found in gasoline and the development of simple electrochemical diene sensors. The detection of dienes in fuels is important as they readily polymerise and form gum in fuel tanks. The electroctivity of the dienes was studied with glassy carbon electrode (GCE) and Pt electrode in tetrabutylammonium perchlorate (TBAP)/acetonitrile solution. Polyaniline-polystyrene sulfonic acid (PANi-PSSA) composite fi

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3

Briega-Martos, Valentín. "Unraveling the oxygen reduction reaction mechanism: occurrence of a bifurcation point before hydrogen peroxide formation." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/102311.

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En la presente tesis doctoral se realiza un estudio detallado sobre el mecanismo de la reacción de reducción de oxígeno (ORR) en electrodos monocristalinos de platino. Para ello, se han realizado medidas electroquímicas usando la configuración de electrodo rotatorio de menisco colgante (HMRDE) con superficies con distinta estructura superficial y variando condiciones de la disolución de trabajo como el pH, fuerza iónica o la ausencia o presencia de bromuros. La conclusión principal que se extra de estos experimentos es la posibilidad de la existencia de un punto de bifurcación en el mecanismo,

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4

Khanfar, Mohammad F. "Molybdenum-modified platinum electrodes /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,160874.

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5

Koda, Ryo. "Electrochemical deposition of metal on microporous silicon electrodes influenced by hydration structures of solutes and electrode surfaces." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199323.

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6

Morimoto, Yu. "Electrochemical oxidation of methanol on platinum and platinum based electrodes." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1058206604.

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7

Rudge, Andrew John. "The photoelectrochemistry of platinum." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358597.

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8

Aixill, W. Joanne. "Electrode processes." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:9578fd22-42fe-41cc-9d92-96f8272956d8.

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The work presented in this thesis first characterises a high speed channel flow cell and then applies the system to the electro-reduction of nitromethane in aqueous solution. Potential step transient measurements are carried out with the current-time transients simulated using a model based on the absence of axial diffusion. The excellent agreement between theory and experiment confirms the proposed mass transport model and further demonstrates that the combination of current-time transients recorded using the high speed channel flow cell and numerical simulations provide a powerful tool to ac

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9

Jayaratna, Husantha G. "Stripping/plating analysis at carbon and metallic interdigitated electrodes /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487848078449337.

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10

Pegg, David John. "Structural and chemical promotion of platinum electrodes." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242320.

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11

Sandoval, Andrea P. "Reacciones electroquímicas modelo en la interfaz líquido iónico-electrodo monocristalino de platino." Doctoral thesis, Universidad de Alicante, 2015. http://hdl.handle.net/10045/53433.

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Las reacciones de oxidación de hidrógeno, reducción de oxígeno y la síntesis de PEDOT fueron evaluadas en líquidos iónicos y sobre electrodos monocristalinos de platino mediante técnicas electroquímicas clásicas, impedancia electroquímica, microscopía de fuerza atómica y espectroscopia infrarroja de reflexión externa. Se desarrolló un protocolo de purificación del líquido iónico y de la limpieza de los electrodos monocristalinos para garantizar condiciones reproducibles, y se observó que las reacciones de oxidación de hidrógeno y de polimerización son sensibles a la estructura superficial del

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12

Sheppard, Sally-Ann. "Characterisation of dispersed, platinum-coated fuel cell electrodes." Thesis, University of Portsmouth, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264837.

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13

Sanchez, Pablo Lozano. "Fabrication and electroanalytical properties of mesoporous platinum electrodes." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413929.

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14

Clark, Stacey L. "Sonovoltammetric detection of cadmium (II) at mercury thin film electrodes." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1422.

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Thesis (M.S.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains vii, 57 p. : ill. Includes abstract. Includes bibliographical references (p. 55-57).

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15

Ahmed, Mujib. "An electrochemical study of well-defined nafion coated platinum and platinum-bimetallic electrodes." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/42261/.

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In this investigation, cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS) and rotating disc electrode (RDE) measurements of the oxygen reduction reaction (ORR) have been used to explore the complex three-phase Nafion-platinum-electrolyte interface. This interface is at the heart of the functioning membrane electrode assembly (MEA) of a fuel cell. CV was primarily used to analyse ultra-thin Nafion films, deposited (without contamination) onto various flat and stepped platinum and platinum bimetallic single crystal electrodes. For Pt{111}, XPS measurements were also used to determin

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16

Brew, Ashley. "Electrochemical studies of the oxygen reduction reaction : platinum and platinum bimetallic single crystal electrodes." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/88050/.

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The general objective of this investigation was to elucidate the effect that surface species such as OHads, Oads and the interfacial water layer have on the oxygen reduction reaction activity of active platinum and platinum alloy catalysts in perchloric acid electrolyte. To that end, these are the investigations that were carried out: [Pt n{111}x{100}] and [Pt n{100}x111}] series of surfaces. These surfaces exhibit OHads/Oads formation at terrace and step sites in the potential range relevant to loss in ORR activity. The increase in activity observed at low step density was assigned to the dis

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17

Hudak, Eric Michael. "Electrochemical Evaluation of Platinum and Diamond Electrodes for Neural Stimulation." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1301967862.

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18

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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19

Noh, Tae-Geun. "Spatiotemporal pattern formation in the electro-oxidation of formic acid on Pt effect of electrode geometry and lowered symmetry /." [S.l. : s.n.], 2005. http://www.diss.fu-berlin.de/2005/108/index.html.

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20

Mougenot, Mathieu. "Elaboration et optimisation d'électrodes de piles PEMFC à très faible taux de platine par pulvérisation plasma." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00667739.

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Cette thèse réalisée dans le cadre des projets PIE CNRS AMELI-0Pt et AMEPlas et ANR AMADEUS a regroupé plusieurs entités autour de la thématique des piles à combustible : Dreux Agglomération puis l'Agence Innovation Made In Dreux (MID), le GREMI, le LACCO et initialement l'industriel MHS Equipment. L'objectif de ce travail est l'élaboration par voie plasma et l'optimisation d'électrodes de piles à combustible de type PEMFC et SAMFC dans le but d'obtenir de bonnes performances avec des charges de platine ultra faibles ou sans platine. Le projet a été organisé en quatre étapes : l'étude de la cr

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21

Singer, Simcha Lev. "Low platinum loading electrospun electrodes for proton exchange membrane fuel cells." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38280.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.<br>Includes bibliographical references (p. 104-106).<br>An experimental study was performed to evaluate the utility of electrospun carbon nanofiber supports for sputtered platinum catalyst in proton exchange membrane fuel cells. The performance of the sputtered nanofiber supports was similar to that of sputtered commercial gas diffusion layers in single cell fuel cell tests. However, sputtered platinum electrodes performed significantly worse than commercial thin film electrodes due to high activation

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22

Hunter, Katherine. "Fundamental studies of electrochemical oxide formation on platinum single crystal electrodes." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/100871/.

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Platinum single crystal electrodes were used to investigate electrochemical oxides and related surface species and their impact upon important catalytic reactions such as the oxygen reduction reaction (ORR). Notions of perchlorate anions being “non-specifically adsorbed” were re-evaluated and challenged. For example, the voltammetry of Pt single crystal electrodes as a function of perchloric acid concentration (0.05–2.00 M) was studied in order to test the assertion by Watanabe et al. that perchlorate anions specifically adsorb on polycrystalline platinum. Specific adsorption of perchlorate an

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23

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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24

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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25

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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26

Abaoud, Hassan Abdulaziz. "Studies on proton exchange membrane fuel cells with low platinum loading electrodes." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422711.

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27

Maxakato, Nobanathi Wendy. "Electrocatalysis of fuel cell molecules on carbon nanotube platinum-ruthenium based electrodes." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/30786.

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The investigation of the kinetics of fuel cell (FC) molecules such as methanol (MeOH), ethylene glycol (EG) and formic acid (FA) on platinum (Pt), platinum/ruthenium (PtRu) and platinum based metal complexes (ruthenium tetrakis(diaquaplatinum)octacarboxy-phthalocyanine (RuOcPcPt) modified basal plane pyrolytic graphite electrode (BPPGE) was carried out. One of the major limitations of FC molecules is that Pt undergoes surface poisoning by strongly adsorbed reaction intermediates, carbon monoxide (CO) that eventually decreases the fuel cell efficiency. Thus, the integration of Pt and or Pt/Ru w

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28

Olivera, Bernat. "Electronic transport in metals at the atomic scale: capacitance emergent magnetism and f-electrons influence." Doctoral thesis, Universidad de Alicante, 2017. http://hdl.handle.net/10045/73051.

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Hemos desarrollado una técnica de medida a 4 puntas en corriente alterna con amplificadores “Lock-in” sincronizados para obtener la variación local de la capacidad entre los electrodos de un STM simultáneamente con su conductancia. La resolución a la que llegamos es de fF. En la evolución de la capacidad frente a la distancia entre electrodos distinguimos tres regiones: capacidad clásica (cuando los electrodos están más alejados), capacidad cuántica (en un régimen intermedio) y fuga de capacidad (cuando se entra en corriente túnel). En el régimen de emisión de campo, en los puntos en los que l

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29

Foster, Simon Edward. "Routes to interfacial deposition of platinum microparticles in solid polymer fuel cells." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/28053.

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30

Mayedwa, Noluthando. "Development of platino-iridium/ruthenium telluride nanoalloy electrode systems for possible application in ammonia fuel cell." University of the Western Cape, 2015. http://hdl.handle.net/11394/5018.

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Philosophiae Doctor - PhD<br>South Africa is undergoing a serious consideration of hydrogen economy in an effort to develop safe clean and reliable alternative energy sources for fossil fuels. Ammonia is one of the promising candidates due to its low production cost, ease in liquefaction at ambient temperatures, and high energy density as compared to methanol. Ammonia has a high content of hydrogen atoms per unit volume and can easily be cracked down into hydrogen and nitrogen. In the last four years carbon intensive coal dependent South Africa has become one of the leading global destinations

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31

Gcilitshana, Oko Unathi. "Electrochemical Characterization of Platinum based anode catalysts for Polymer Exchange Membrane Fuel Cell." Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5972_1266961431.

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<p>In this study, the main objective was to investigate the tolerance of platinum based binary anode catalysts for CO poisoning from 10ppm up to1000ppm and to identify the<br /> best anode catalysts for PEMFCs that tolerates the CO fed with reformed hydrogen.</p>

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32

Zeszut, Ronald Anthony Jr. "Effects of Transport and Additives on Electroless Copper Plating." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1497271315649528.

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33

Morin, Sylvie. "Electrochemical studies of two-dimensional processes at well-defined platinum single crystal electrodes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq21011.pdf.

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34

Zhang, Tianhou. "Theoretical studies of fuel cell reaction mechanisms H₂ and O₂ on platinum electrodes /." online version, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=case1215456813.

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35

Ogbu, Chidiebere. "Peroxide Sensing Using Nitrogen-Doped and Platinum Nanoparticle-modified Screen-Printed Carbon Electrodes." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3622.

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Nitrogen-doped carbon materials have garnered much interest due to their abilities to behave as electrocatalysts for reactions important in energy production (oxygen reduction) and biosensing (hydrogen peroxide reduction). Here, we demonstrate fabrication methods and determine electrocatalytic properties of nitrogen-doped screen-printed carbon (N-SPCE) electrodes. Nitrogen doping of graphite was achieved through a simple soft-nitriding technique which was then used in lab-formulated screen-printing inks to prepare N-SPCEs. N-SPCEs displayed good electrocatalytic activity, reproducibility and l

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36

Zhang, Tianhou. "Theoretical Studies of Fuel Cell Reaction Mechanisms: Water and Oxygen on Platinum Electrodes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1215456813.

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37

Maunier-Morin, Marie-Christine. "Oxydation électrocatalytique de l'éthanol sur le platine et l'or : effets de structure, étude des mécanismes sur le platine par voltammétrie à potentiel programme et par spectroscopie infrarouge de réflexion." Poitiers, 1988. http://www.theses.fr/1988POIT2308.

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38

Mandadi, Deepika. "A Characterization of Caffeine Imprinted Polypyrrole Electrode." TopSCHOLAR®, 2009. http://digitalcommons.wku.edu/theses/130.

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Nanotechnology holds great potential for improving our lives by creating many new materials and devices in medical sciences, electronics and also in energy production. Molecularly imprinted polymers (MIPs) are highly stable synthetic polymers that possess molecular recognition properties due to cavities created in the polymer matrix that are complementary to an analyte both in shape and in positioning of functional groups. These MIPs have been widely employed for diverse applications (e.g., in chromatographic separation, drug screening, chemosensors, catalysis, immunoassays etc) due to their s

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39

Coudray, Mathias. "Procédé de recyclage des Assemblages Membrane Electrode (AME) de piles à combustible utilisant des liquides ioniques." Thesis, Lyon, 2019. https://n2t.net/ark:/47881/m6h70f5d.

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Le recyclage des assemblages membrane électrode (AMEs) des piles à combustible à membrane échangeuse de protons (PEMFC) est en enjeu important pour le développement du marché de ces piles fonctionnant à l’hydrogène. Dans ces AMEs se trouvent le platine (Pt), un métal précieux et rare qui conditionne majoritairement le coût total de la pile. Le recyclage du Pt est encore largement effectué par hydro ou pyrométallurgie ce qui entraîne le rejet de gaz toxiques et polluants dans l’environnement. Plusieurs études ont porté sur la mise en place d’une voie plus soutenable écologiquement que le tradit

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40

Russell, Jason Bradley. "Investigation of the Effect of Catalyst Layer Composition on the Performance of PEM Fuel Cells." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34526.

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The catalyst layer of a proton exchange membrane (PEM) fuel cell is a porous mixture of polymer, carbon, and platinum. The characteristics of the catalyst layer play a critical role in determining the performance of the PEM fuel cell. In this research, sample membrane electrode assemblies (MEAs) are prepared using various combinations of polymer and carbon loadings while the platinum catalyst surface area is held constant. For each MEA, polarization curves are determined at common operating conditions. The polarization curves are compared to assess the effects of the catalyst layer composition

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41

Roller, Justin. "Low platinum electrodes for proton exchange fuel cells manufactures by reactive spray deposition technology." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/4458.

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Reactive spray deposition technology (RSDT) is a method of depositing films or producing nanopowders through combustion of metal-organic compounds dissolved in a solvent. This technology produces powders of controllable size and quality by changing process parameters to control the stoichiometry of the final product. This results in a low-cost, continuous production method suitable for producing a wide range of fuel cell related catalyst films or powders. In this work, the system is modified for direct deposition of both unsupported and carbon supported layers on proton exchange membrane (PEM)

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42

De, Cliff Steve V. "Electrochemical Quartz Crystal Microbalance and Impedance Analysis investigations of surface processes at platinum electrodes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq20996.pdf.

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43

Feltovich, Susanne D. "Influence of solvent on the infared spectrum of carbon monoxide adsorbed on platinum electrodes." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020247/.

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44

Boulenouar-Mohamedi, Fatma Zohra. "Étude de l'oxydation anodique de l'hydrogène à l'interface métal/zircone stabilisée à haute température (métal=platine, nickel, cuivre)." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0055.

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Ce travail s'inscrit dans le cadre de recherches conduites sur les piles a combustible fonctionnant a haute temperature et mettant en jeu un electrolyte solide conducteur par ions oxydes (zircone stabilisee a l'oxyde d'yttrium: ysz). L'objet de cette recherche est de preciser les influences respectives des pressions partielles d'hydrogene et d'eau dans la polarisation anodique de l'interface metal/ysz, le metal etant: le platine, le nickel ou le cuivre. A l'equilibre, l'etude a montre l'interet de differencier les roles respectifs de l'hydrogene et de la vapeur d'eau et de ne pas traiter les r

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45

Silwana, Bongiwe. "Graphene supported antimony nanoparticles on carbon electrodes for stripping analysis of environmental samples." University of the Western Cape, 2015. http://hdl.handle.net/11394/5141.

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>Magister Scientiae - MSc<br>Platinum Group Metals (PGMs), particularly palladium (Pd), platinum (Pt) and rhodium (Rh) have been identified as pollutants in the environment due to their increased use in catalytic converters and mining in South Africa (as well as worldwide). Joining the continuous efforts to alleviate this dilemma, a new electrochemical sensor based on a nanoparticle film transducer has been developed to assess the level of these metals in the environment. The main goal of this study was to exploit the capabilities of nanostructured material for the development and application

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46

Essis-Yei, L. Hortense. "Oxydation electrocatalytique du glucose sur le platine et l'or en milieu aqueux." Poitiers, 1987. http://www.theses.fr/1987POIT2277.

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47

Martínez-Hincapié, Ricardo. "Efecto del pH en la estructura de la doble capa eléctrica y su influencia en la reactividad electroquímica." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/94050.

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El trabajo realizado en esta tesis busca entender el efecto de la doble capa eléctrica en la reactividad electroquímica. El uso de electrodos de monocristalinos de platino ha permitido realizar estudios fundamentales de la estructura interfacial electrodo/disolución poniendo de manifiesto la sensibilidad estructural que tienen la mayoría de los procesos electroquímicos. Así mismo, el uso de diferentes condiciones de pH ha permitido la obtención de información molecular. La primera parte de la tesis lidia sobre aspectos más fundamentales, como lo es la obtención del potencial de carga cero, par

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48

García, García Vicente. "Reducción electroquímica de β-cloropropiofenona sobre electrodos de mercurio y platino en DMF". Doctoral thesis, 1991. http://hdl.handle.net/10045/3533.

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49

Rodes, García Antonio. "Una aproximación molecular al estudio de procesos electródicos: caracterización electroquímica de superficies escalonadas de platino y su aplicación al estudio de diferentes procesos de reconstrucción superficial." Doctoral thesis, 1991. http://hdl.handle.net/10045/3920.

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50

Herrero, Enrique. "Adsorción y oxidación de metanol, ácido fórmico y CO sobre electrodos monocristalinos de platino modificados con adátomos." Doctoral thesis, 1995. http://hdl.handle.net/10045/3609.

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