过电位
析氧
电化学
电催化剂
催化作用
分解水
纳米针
材料科学
钴
磷化物
化学工程
兴奋剂
制氢
无机化学
化学
纳米技术
物理化学
电极
光电子学
工程类
光催化
纳米结构
生物化学
作者
Yong Wang,Tongtong Lian,Yaowen Zhang,Chenghai Gao,Xin Lei,Hongyao Xue,Yixue Zhang,Haiqin Zhang,Lixin Chen,Keming Sun
标识
DOI:10.1016/j.ijhydene.2023.05.303
摘要
Cobalt phosphide (CoP) is a promising electrocatalyst due to its abundance and excellent stability in alkaline solution. However, its poor conductivity and intrinsic catalytic activity limit its potential in electrochemical water splitting. To address this, a heterogeneous atom doping strategy has been proposed to synthesize magnesium-doped cobalt phosphide nanoneedle arrays, or Mg-doped CoP. Our theoretical calculations show that transition metal Mg atoms doping into the CoP lattice can enhance the electronic structure and modulate the free energy of reacting species, resulting in a significant improvement in the intrinsic catalytic activities for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) process. The electrochemical tests reveal that the optimal 10% Mg-doped CoP nanoneedle arrays exhibit outstanding HER and OER electrocatalytic activities with overpotential values of 85 and 236 mV at 10 mA/cm2, respectively, outperforming previously reported CoP-based catalysts. This study not only presents a strategy to enhance the catalytic activity of CoP-based materials, but also offers a reference for achieving efficient electrochemical hydrogen production by hydrolysis.
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