期刊
ELECTROCHIMICA ACTA
卷 191, 期 -, 页码 183-191出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.085
关键词
Direct ethanol fuel cells; metal-oxide promoters; PtRu/C catalyst; ethanol electro-oxidation
资金
- CNPq (CNPq) [238319/2012-1]
Metal oxides are investigated, as additives of a PtRu/C catalyst, for enhancing the electro-oxidation of ethanol in acidic solution. High surface area TiO2 and SnO2 additives are synthesized and physicochemically characterized. These oxides are added to PtRu/C during the catalytic ink preparation to obtain tri-metallic composite electrodes. These composite electro-catalysts are investigated for the ethanol electro-oxidation in half-cell configuration in comparison with additive-free PtRu/C and Pt/C catalysts. The PtRu-based composite catalyst containing SnO2 promoter shows a lower onset potential and larger current density for ethanol oxidation than the additive-free catalyst and that containing TiO2 promoter. The composite catalysts (PtRu/C + metal oxide) are also used in a direct ethanol fuel cell under practical operating conditions and assessed against the benchmark PtRu catalyst. An increase in performance is recorded with the composite tri-metallic electrodes. The analysis of electro-catalytic activity towards ethanol oxidation reaction and ethanolic residues coverage indicates an enhanced capability to activate ethanol chemisorption or a larger electroactive surface area, together with a faster intrinsic activity at lower overpotential, as the reasons for the improved performance with the use of metal oxide additives. (C) 2016 Elsevier Ltd. All rights reserved.
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