双功能
分解水
析氧
材料科学
阳极
层状双氢氧化物
化学工程
合金
阴极
催化作用
电催化剂
电极
无机化学
冶金
电化学
化学
物理化学
工程类
光催化
生物化学
作者
Yifei Chen,Jiahong Li,Tiantian Liu,Si-Hang You,Peng Liu,Fu-Jin Li,Mengqi Gao,Shuguang Chen,Feifei Zhang
出处
期刊:Rare Metals
[Springer Nature]
日期:2023-03-28
卷期号:42 (7): 2272-2283
被引量:70
标识
DOI:10.1007/s12598-022-02249-x
摘要
Abstract NiFe layered double hydroxides (NiFe LDHs) have been intensively developed for the oxygen evolution reaction (OER) in alkaline media; however, their unsatisfactory hydrogen evolution reaction (HER) performance limits their practical application in overall water splitting. Herein, a simple and efficient one‐step electrodeposition method is used to accomplish in situ growth of NiFe LDHs–NiFe alloy gradient hybrid coatings on a carbon cloth (CC). Within the binder‐free electrode, NiFe LDHs nanosheets with a low‐crystalline nature exhibit highly active bifunctional OER/HER activities, and the NiFe alloy acts as a stable electron highway and strong skeleton bridge between NiFe LDHs and the CC. When the electrodes are simultaneously employed as the cathode and anode for overall water splitting, they require low cell potentials of 1.441 V at 10 mA·cm −2 and 1.703 V at 100 mA·cm −2 , respectively, and they demonstrate outstanding stability at a current density greater than 100 mA·cm −2 for more than 100 h. This is one of the best bifunctional OER and HER catalysts for overall water splitting. Both lattice defects and surface reconstructions crucially contribute to the bifunctional OER/HER activities of NiFe LDHs. This simple and scalable synthesis approach presents an intriguing paradigm for industrial production, and the fabricated electrode has potential application in high‐current‐density water splitting.
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