塔菲尔方程
过电位
电催化剂
析氧
分解水
氢氧化物
合金
电化学
材料科学
双功能
碳酸盐
钴
催化作用
氢氧化钴
化学工程
电极
冶金
无机化学
化学
物理化学
工程类
光催化
生物化学
作者
Meiru Zhao,Jia Du,Hao Lei,Lingwei Pei,Zhangquan Gong,Xing Wang,Haifeng Bao
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:14 (8): 3191-3199
被引量:12
摘要
The development of earth-abundant catalysts toward high-efficiency overall water splitting is of critical importance for electrochemical hydrogen production. Here, novel FeNi alloy quantum dot (QD)-decorated cobalt carbonate hydroxide (CoCH) nanosword arrays were successfully constructed on Ni foam (FeNi/CoCH/Ni foam) and used as an efficient bifunctional electrocatalyst for overall water splitting in alkaline media. Benefiting from the synergistic effect between the FeNi alloy QDs and CoCH, the FeNi/CoCH/Ni foam electrode delivers a current density of 20 mA cm-2 at an overpotential of 240 mV and a small Tafel slope of 44.8 mV dec-1 for the oxygen evolution reaction (OER). Further, it displays excellent performance for overall water splitting with a voltage of 1.49 V at 10 mA cm-2 and maintains its activity for at least 23 h. In particular, it only needs low cell voltages of 1.54 and 1.6 V to drive high current densities of 100 and 400 mA cm-2, respectively, which is much better than commercial Pt/C/Ni foam‖RuO2/Ni foam, providing great potential for large-scale application.
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