Journal
JOURNAL OF POWER SOURCES
Volume 178, Issue 1, Pages 97-102Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2007.11.044
Keywords
electro-catalysts; structural water; titanium oxide nanotube; catalyst layer; ethanol electro-oxidation
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TiO2 nanotubes (TNTs) with different structural water were obtained by heat treatment under different temperatures. The role of the structural water in TNTs co-catalyzing ethanol oxidation with Pt/C catalyst was studied systematically. Electrochemical studies using cyclic voltammetry and CO stripping voltammetry indicated that more structural water in TNTs was favorable for improving the tolerance of Pt/C to poisoning species; while chronoamperometry curves and repeated cyclic voltammograms showed that slightly less structural water in TNTs actually led to higher catalytic activity and better stability of Pt/C catalysts for ethanol oxidation. This strange result has been analyzed and was ascribed to the appropriate balance of bi-functional mechanism and ethanol transfer in the catalyst layer with less structural water. (C) 2007 Elsevier B.V. All rights reserved.
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