磷化物
材料科学
三元运算
电催化剂
分解水
双功能
析氧
化学工程
催化作用
镍
纳米技术
无机化学
电化学
电极
冶金
物理化学
化学
工程类
光催化
程序设计语言
计算机科学
生物化学
作者
Jing Yu,Qianqian Li,Yuan Li,Cheng‐Yan Xu,Vinayak P. Dravid,Jinsong Wu
标识
DOI:10.1002/adfm.201603727
摘要
Development of low‐cost, high‐performance, and bifunctional electrocatalysts for water splitting is essential for renewable and clean energy technologies. Although binary phosphides are inexpensive, their performance is not as good as noble metals. Adding a third metal element to binary phosphides (Ni‐P, Co‐P) provides the opportunity to tune their crystalline and electronic structures and thus their electrocatalytic properties. Here, ternary phosphide (NiCoP) films with different nickel to cobalt ratios via an electrodeposition technique are synthesized. The films have a triple‐layered and hierarchical morphology, consisting of nanosheets in the bottom layer, ≈90–120 nm nanospheres in the middle layer, and larger spherical particles on the top layer. The ternary phosphides exhibit versatile activities that are strongly dependent on the Ni/Co ratios and Ni 0.51 Co 0.49 P film is found to have the best electrocatalytic activities for both hydrogen evolution reactions and oxygen evolution reactions. The high performance of the ternary phosphide film is attributed to enhanced electric conductivity so that reaction kinetics is accelerated, enlarged surface area due to the hierarchical and three‐layered morphology, and increased local electric dipole so that the energy barrier for the water splitting reaction is lowered.
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