Journal
RENEWABLE ENERGY
Volume 87, Issue -, Pages 31-41Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2015.09.060
Keywords
Nanomaterials; Nanotubes; Oxygen reduction; Pt:Au electrocatalyst; Fuel cell
Funding
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) [194153, 224627]
- Tecnologico Nacional de Mexico [5216.14-P]
- CONACyT
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Platinum-gold nanoparticles supported on multi-wall carbon nanotubes (MWCNT) with various Pt:Au ratios are prepared by microemulsion method for use as electrocatalysts in the oxygen reduction reaction (ORR). The influence of the Pt:Au ratio on the electrocatalytic activity during ORR is investigated in detail. The synthesized nanomaterials are analyzed by different physicochemical techniques. The electrocatalytic activity for oxygen reduction is evaluated using a rotating disk electrode (RDE) system. We report that the activity and oxygen reduction mechanism depends strongly on the Pt:Au ratio; in the case of Pt:Au ratio higher than 0.60, oxygen is reduced to water by a four electron process pathway, while at 0.33 ratio the reaction follows a two-electron-transfer mechanism. (C) 2015 Elsevier Ltd. All rights reserved.
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