期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 536, 期 -, 页码 189-195出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.10.049
关键词
Galvanic replacement deposition; Amorphous Ni(OH)(2); Pt nanoflakes; Ni foam; Methanol oxidation; Alkaline fuel cell
资金
- National Natural Science Foundation of China [21203137]
Direct methanol fuel cells (DMFCs) are promising power sources for automobiles and portable electronic devices. Its commercialization depends on the anodes with high activity, low Pt content, and especially high stability towards methanol oxidation. Herein, a self-supported Pt nanoflakes and amorphous Ni (OH)2 on nickel foam composite electrode (Pt-doped Ni(OH)(2), Pt content: 1.5 wt%) with rich defects was fabricated via a facile and low cost galvanic deposition method. This composite anode exhibits enhanced activity and stability for methanol oxidation in alkaline media, which mainly come from the synergistic effects between Pt nanoflakes and amorphous Ni(OH)(2) on Ni foam substrate and defect engineering. During a typical methanol oxidation process over Pt-doped Ni(OH)(2): Pt nanoflakes act as the active sites; amorphous Ni(OH)2 promotes the poison removal; Ni foam provides high electric conductivity and large area; defects sites contribute to the enhanced activity and stability. This work suggests that this self-supported and defect-enriched Pt-doped Ni(OH)(2) composite catalyst is an alternative to commercial Pt-based electrocatalyst for low temperature DMFCs. (C) 2018 Elsevier Inc. All rights reserved.
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