Journal
JOURNAL OF POWER SOURCES
Volume 362, Issue -, Pages 10-19Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.07.011
Keywords
Fuel cells; Nanoporous CuO/TiO2/Pd-NiO composite catalysts; Dealloying method; Methanol oxidation; Ethanol oxidation
Funding
- National Natural Science Foundation of China [51172159]
- Recruitment Program of Global Experts 1000 Talents Plan of China [WQ20121200052]
- Key project of Natural Science Foundation of Tianjin City [14JCZDJC38600]
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Nanoporous CuO/TiO2/Pd-NiO-x (x = 0, 1, 3, 5, 7 at%) catalysts have been synthesized by dealloying Cu-Ti-Pd-Ni alloy ribbons in acid solution. The nanoporous structure and chemical composition of the catalysts distribute uniformly. Based on the electrochemical active area (EASA), electrocatalytic activity and stability, the np-CuO/TiO2/Pd-NiO-3 catalyst possesses the best performance for methanol and ethanol electro-oxidation. For methanol and ethanol electro-oxidation, the anodic current densities in forward scan of the np-CuO/TiO2/Pd-NiO-3 catalyst are about 5.6 times and 2.1 times larger than that of the np-CuO/TiO2/Pd catalyst, respectively. The introduction of NiO provides more electrochemical active sites due to the improved geometrical and bifunctional mechanism. NiO promotes the adsorption of oxygen-containing species (OHads) on the catalyst surface, and electron effect between Pd and Ni is favorable for charge transfer. This accelerates the removal of intermediate products during the oxidation process. The electrocatalytic processes of methanol and ethanol oxidation in alkaline solution are controlled by both charge transfer and diffusion. (C) 2017 Elsevier B.V. All rights reserved.
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