期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 27, 页码 23222-23229出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b06152
关键词
interfaces; synergistic effect; bimetallic phosphides; water splitting; electrocatalysis
资金
- National Natural Science Foundation of China (NSFC) [91534201, 21571012, 21476012]
Bimetallic phosphides have attracted research interest for their synergistic effect and superior electrocatalytic activities for electrocatalytic water splitting. Herein, a MOF-derived phosphorization Pern, approach was developed to produce Ni2P-CoP bimetallic phosphides as bifunctional electrocatalysts for both hydrogen and oxygen evolution reactions (HER and OER). Ni2P-CoP shows superior electrocatalytic activities to both pure Ni2P and CoP toward HER and OER, revealing a strong synergistic effect. High-resolution transmission electron microscopy and energy dispersive X-ray spectroscopy elemental mapping analysis show that, in the sample Ni2P-CoP, the Ni2P and CoP nanoparticles with an average particle size 10-20 nm were mixed closely on the nanoscale, creating numerous Ni2P/CoP interfaces. By comparison with the sample Ni2P+CoP, in which seldom Ni2P/CoP interfaces exist, we documented that the Ni2P/CoP interface is an essential prerequisite to enhanced electrocatalytic activities in Ni2P-CoP bimetallic phosphides. This finding is meaningful for designing and developing bicomponent and even multicomponent electrocatalysts.
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