电催化剂
双功能
分解水
析氧
材料科学
纳米线
催化作用
氢氧化物
化学工程
碱性水电解
层状双氢氧化物
过电位
塔菲尔方程
双功能催化剂
纳米技术
无机化学
电化学
电解水
化学
电极
物理化学
有机化学
光催化
工程类
作者
Hu Jin,Shengli Zhu,Yanqin Liang,Shuilin Wu,Zhaoyang Li,Shuiyuan Luo,Zhenduo Cui
标识
DOI:10.1016/j.jcis.2020.12.016
摘要
Low-cost, highly active and earth-abundant bifunctional electrocatalyst is very important for the large-scale hydrogen production by water splitting. In the present work, we report a novel two-step method to fabricate three-dimensional (3D) porous catalyst for water splitting. The Ni3Se2 nanowires are in-situ formed on Ni foam (NF) by simple hydrothermal method, subsequently NiFe layered double hydroxid (NiFe-LDH) nanosheets vertically grow on the nanowires to form core-shell structure. The as-formed Ni3Se2@NiFe-LDH/NF catalyst shows 3D porous structure, which can provide large specific surface area and effective substance transfers. The tight bonding between Ni3Se2 nanowires and NiFe-LDH nanosheets ensures good electron transfer. The Ni3Se2@NiFe-LDH/NF catalyst exhibits outstanding electrocatalytic property for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline medium. The overpotentianls for HER and OER at the current density of 10 mA cm−2 in 1 M KOH are 68 mV and 222 mV, respectively. For overall water splitting, a small cell voltage of 1.55 V can achieve a current density of 10 mA cm−2 in 1 M KOH. This work provides a guidance for the rational design and development of heterostructure electrocatalysts for overall water splitting.
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