期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 17, 期 12, 页码 3482-3489出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201002949
关键词
electrochemistry; fuel cells; gold icosahedra; hydrothermal synthesis; silver icosahedra
资金
- National Natural Science Foundation of China [20971003, 20671003]
- Chinese Ministry of Education [209060]
- Science and Technological Fund of Anhui Province for Outstanding Youth [10040606Y32]
- Anhui Normal University
Much effort has gone into generating polyhedral noble metal nanostructures because of their superior electrocatalytic activities for fuel cells. Herein, we report uniform, high-yield icosahedral silver and gold nanoparticles by using a facile one-pot, seedless, water-based approach that incorporates polyvinyl pyrrolidone and ammonia. Electrocatalysis of the oxygen-reduction reaction was carried out in alkaline media to evaluate the performance of the icosahedral nanoparticles. They showed excellent stability and much higher electrocatalytic activity than the spherelike nanoparticles; they display a positive shift in reduction peak potential for O-2 of 0.14 and 0.05 V, while the reduction peak currents of the silver and gold icosahedra are 1.5- and 1.6-fold, respectively, better than the spherelike nanoparticles. More importantly, the icosahedral nanoparticles display electrocatalytic activities comparable with commercial Pt/C electrocatalysts. The facile preparation of icosahedral silver and gold nanoparticles and their superior performance in the oxygen reduction reaction render them attractive replacements for Pt as cathode electrocatalysts in alkaline fuel cells.
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