镍
析氧
钴
电催化剂
氢氧化物
分解水
材料科学
微观结构
堆积
层状双氢氧化物
无机化学
化学工程
纳米技术
化学
冶金
电化学
电极
物理化学
催化作用
生物化学
光催化
工程类
有机化学
作者
Yanping Ye,Haoyu Li,Jianliang Cao,Xiaoyan Liu,Hougang Fan,Maobin Wei,Lili Yang,Jing Yang,Yanli Chen
标识
DOI:10.1016/j.ijhydene.2023.01.212
摘要
The development of Ni–Fe layered double hydroxide (NiFe LDH) catalysts for overall water splitting (OWS) is urgently required. NiFe LDHs are promising catalysts for the oxygen evolution reaction (OER). However, their hydrogen evolution reaction (HER) performance is restricted by slow kinetics. The construction of multiple types of active sites to simultaneously optimise the OER and HER performance is significant for OWS using NiFe LDHs. Hence, a Co-doped NiFe LDH electrocatalyst with dislocations and stacking faults was designed to modulate the electronic structure and generate multiple types of activity sites. The Co0.03-NiFe0.97 LDH catalyst only required overpotentials of 280 (50 mA cm−2, OER) and 170 mV (10 mA cm−2, HER). However, it reached a current density of 50 mA cm−2 at 1.53 V during OWS. Co0.03-NiFe0.97 LDHs could be stabilised for 140 h at 1.52 V. Furthermore, Co0.03-NiFe0.97 LDHs exhibited a higher electrocatalytic activity than commercial Raney nickel and Pt/C||IrO2 under industrial conditions. The significant specific surface area, high conductivity, and unique microstructures are the major factors contributing to the excellent OWS performance. This study suggests an efficient strategy for introducing microstructures to fabricate catalysts with high activity for application in OWS.
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