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Author Savadogo ♦ Essalik, A.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword DIRECT ENERGY CONVERSION ♦ ACID ELECTROLYTE FUEL CELLS ♦ CATHODES ♦ PERFORMANCE ♦ PLATINUM ♦ PARTICLE SIZE ♦ ELECTROCATALYSTS ♦ TUNGSTEN OXIDES ♦ CATALYST SUPPORTS
Abstract A 2% Pt-1% H{sub 2}WO{sub 4}-based electrocatalyst has been fabricated by an inexpensive chemical route for use as an oxygen cathode in 99% phosphoric acid at 180C. The effect of the platinum particle size on the electrode performance for the oxygen reduction reaction (ORR) was studied. The electrocatalytic properties for the ORR, e.g., exchange current density, mass activity, and specific activity of a 2% Pt-1% H{sub 2} WO{sub 4}-based electrode fabricated from 5% pt, were found to be several times higher than those of 10% Pt-based electrocatalysts. It was shown that the performance of this electrode is not related to an increase in its electrochemically active surface area, but to its chemical composition. Based on the concept of synergistic process of the ORR on materials the authors have previously emphasized, it is shown that a 2% Pt-1% H{sub 2} WO{sub 4}-based electrocatalyst is a synergistic system due to an increase of the active sites at the electrocatalyst surface.
ISSN 00134651
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Journal Journal of the Electrochemical Society
Volume Number 143
Issue Number 6


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