过电位
塔菲尔方程
分解水
磷化物
析氧
材料科学
碱性水电解
化学工程
催化作用
钴
纳米线
制氢
纳米技术
电极
化学
电化学
电解
镍
冶金
物理化学
工程类
电解质
光催化
生物化学
作者
Binglin Qiu,Aijuan Han,Daochuan Jiang,Taotao Wang,Pingwu Du
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2018-12-21
卷期号:7 (2): 2360-2369
被引量:39
标识
DOI:10.1021/acssuschemeng.8b05137
摘要
Hydrogen production via water splitting is a promising pathway to a clean energy resource. Herein we report the direct growth of cobalt phosphide (CoP) nanowires on conductive nickel foam (CoP@NF) as an efficient bifunctional catalyst for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium. CoP@NF electrodes were facilely synthesized by a one-pot hydrothermal method followed by a phosphorization step. For HER, the CoP@NF electrode showed excellent catalytic activity with a low overpotential of only ∼100 mV to reach 10 mA/cm2, a low Tafel slope of 57 mV/dec, and long-term durability in 1.0 M KOH. Interestingly, anodic activation of the CoP@NF electrode led to the formation of a CoP/CoO core–shell structure. The CoP/CoO core–shell structure exhibited a low overpotential of 300 mV to reach 10 mA/cm2 for OER and a Tafel slope of 64 mV/dec was achieved with good durability in 1.0 M KOH. Furthermore, CoP@NF and CoP/CoO@NF electrodes were used to construct a water splitting electrolyzer, which can perform overall water splitting activity with a current density of 10 mA/cm2 under a voltage of 1.62 derived by a commercial solar cell.
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