Deposition of PtxRu1−xCatalysts for Methanol Oxidation in Micro Direct Methanol Fuel Cells

Autor:	Hyea Kim, William E. Mustain, Paul A. Kohl, Tyler Osborn
Rok vydání:	2008
Předmět:	chemistry.chemical_compound chemistry Reducing agent Electrode Inorganic chemistry General Chemistry Methanol Cyclic voltammetry Methanol fuel Deposition (chemistry) Electrode potential Catalysis
Zdroj:	Israel Journal of Chemistry. 48:251-257
ISSN:	1869-5868 0021-2148
DOI:	10.1560/ijc.48.3-4.251
Popis:	Platinum-ruthenium electrodes (PtxRu1-x) have been prepared by elec- trochemical and electroless deposition and investigated as catalysts for the oxidation of methanol in acidic solutions. PtxRu1-x deposits were electrochemically deposited from acidic chloride electrolytes at potentials between -0.46 and 0.34 V (vs. NHE). The composition of the electrodeposit was estimated by energy dispersive X-ray spectroscopy and is a strong function of the electrode potential. An empirical model for the deposition process is presented and kinetic parameters are estimated and dis- cussed. Also, the methanol oxidation activity of the PtxRu1-x catalysts was character- ized by cyclic voltammetry in 1.0 M CH3OH, 1.0 M H2SO4 solutions. Electroless PtxRu1-x samples were prepared in a modified Leaman bath with hydrazine dihydrochloride as the reducing agent. The kinetic results for the electro- chemical deposition of PtxRu1-x were directly applied and the deposition potential was estimated as approximately 0.40 V.
Databáze:	OpenAIRE
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