期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201706008
关键词
bimetal phosphide; charge transfer; electrocatalysis; nanocages; oxygen evolution reaction
类别
资金
- Nature Science Foundation of Guangdong Province [2017A030313279]
- Hong Kong Polytechnic University [G-YW2A, 1-ZVGH, 1-ZVK1]
- National Nature Science Foundation of China [51607102]
Replacement of precious metals with earth-abundant electrocatalysts for oxygen evolution reaction (OER) holds great promise for realizing practically viable water-splitting systems. It still remains a great challenge to develop low-cost, highly efficient, and durable OER catalysts. Here, the composition and morphology of Ni-Co bimetal phosphide nanocages are engineered for a highly efficient and durable OER electrocatalyst. The nanocage structure enlarges the effective specific area and facilitates the contact between catalyst and electrolyte. The as-prepared Ni-Co bimetal phosphide nanocages show superior OER performance compared with Ni2P and CoP nanocages. By controlling the molar ratio of Ni/Co atoms in Ni-Co bimetal hydroxides, the Ni0.6Co1.4P nanocages derived from Ni0.6Co1.4(OH)(2) nanocages exhibit remarkable OER catalytic activity (eta = 300 mV at 10 mA cm(-2)) and long-term stability (10 h for continuous test). The density-functional-theory calculations suggest that the appropriate Co doping concentration increases density of states at the Fermi level and makes the d-states more close to Fermi level, giving rise to high charge carrier density and low intermedia adsorption energy than those of Ni2P and CoP. This work also provides a general approach to optimize the catalysis performance of bimetal compounds.
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