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- Title
High electrocatalytic activity of non-noble Ni-Co/graphene catalyst for direct ethanol fuel cells.
- Authors
Wang, Zaihua; Du, Yongling; Zhang, Fengyuan; Zheng, Zhixiang; Zhang, Yuzhen; Wang, Chunming
- Abstract
The electrocatalytic oxidation of ethanol is studied on the non-noble catalysts Ni-Co/graphene and Ni/graphene supported on glass carbon electrode (GCE) in alkaline medium. The synthesized materials are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and scanning transmission electron microscopy. The elements of Ni-Co/graphene and Ni/graphene catalysts are characterized using energy-dispersive X-ray spectroscopy. The electrocatalytic properties of Ni-Co/graphene and Ni/graphene for ethanol oxidation are investigated by cyclic voltammetry, chronoamperometry, and Tafel plot. Compared with Ni/graphene catalyst, Ni-Co/graphene has the higher electroactivity and better stability for ethanol oxidation. The rate constant ( k) and charge-transfer coefficient ( α) are calculated for the electron exchange reaction of the modified GCE. The results indicate that Co addition could promote the oxidation reaction at the Ni/graphene catalyst. Our study demonstrates that the low-cost electrocatalyst Ni-Co/graphene has a great potential for real direct ethanol fuel cells' application.
- Subjects
CATALYSTS; GRAPHENE; FUEL cells; CARBON electrodes; X-ray diffraction; CYCLIC voltammetry
- Publication
Journal of Solid State Electrochemistry, 2013, Vol 17, Issue 1, p99
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-012-1855-8