过电位
双功能
析氧
电催化剂
分解水
催化作用
氢氧化物
化学工程
化学
无机化学
材料科学
双功能催化剂
复合数
电化学
物理化学
复合材料
电极
有机化学
光催化
工程类
作者
Liang Li,Ying Guo,Xinran Wang,Xiaowei Liu,Yongwei Lu
出处
期刊:Langmuir
[American Chemical Society]
日期:2021-05-07
卷期号:37 (19): 5986-5992
被引量:31
标识
DOI:10.1021/acs.langmuir.1c00524
摘要
To develop precious-metal-free bifunctional catalysts for overall water splitting, ultraeven Mo-doped CoP composites (Mo-CoP) have been fabricated by an in situ phosphorization protocol using CoMo-layered double hydroxide (CoMo-LDH) as the precursor. The ordered arrangement of cations in the CoMo-LDH could be easily phosphored and generate the ultraevenly dispersed Mo element within the CoP structure, resulting in the excellent bifunctional catalyst for overall water splitting. The hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalytic activities of the composites present an increase first and then a decreasing tendency with increased Mo doping content. Among all the Mo-doped CoP materials, the composite with a Mo/Co mole ratio of 1/2.3 presents the highest HER activity and stability in acidic conditions. At the current density of −10 mA·cm–2 in 0.5 M H2SO4, the overpotential is only 116 mV. In addition, the composite also presents excellent HER and OER performance under alkaline conditions. The overpotential is 118 mV for HER and 317 mV for OER at 10 mA cm–2 in 1 M KOH. It requires a cell voltage of 1.7 V to achieve a current density of 10 mA·cm–2 and maintains a stable water-splitting current for at least 24 h, which is superior to most reported alkaline media. This simple and efficient synthetic approach could also be used for ultraeven doping between other transition metal ions.
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