材料科学
电解水
电解
催化作用
金属
化学工程
电化学
电极
分解水
膜
纳米晶
无机化学
氢
纳米技术
离子交换
氢键
法拉第效率
电压
电导率
导电体
化学键
轨道能级差
膜电极组件
纳米颗粒
工作(物理)
离子
水溶液中的金属离子
分子轨道
作者
Lei Li,Yaoda Liu,Jie Su,Lina Hu,Yong Zhang,Thangavel Sakthivel,Zhixin Guo,Cheng Chao Li,Zhengfei Dai
标识
DOI:10.1002/adfm.202528345
摘要
ABSTRACT The d–p orbital hybridization of metal–based compounds can substantially impact their catalytic activity in water electrolysis. However, the metal‐nonmetal chemical bond may in turn bring down the electrical conductivity and catalytic charge transfer, leading to an activity‐kinetics trade‐off. The co‐effectuation of d–p hybridization and conductive metallic state is thus expectable to optimize the water‐splitting electrocatalysis, but challengeable. Herein, we profile a P‐doped Ir metallic (Ir‐P) structure by dealloying the IrP 2 nanocrystals for the water electrolysis studies. Such a IrP 2 →Ir‐P dealloying is found to neighbour the Ir d ‐band and P p ‐band centers to strengthen the d–p orbital affinity, together with a decreased Ir‐P coordination number. Resultantly, the catalyst actively delivers the hydrogen evolution reaction with ultralow overpotentials of 14, 25, and 64 mV at 10 mA cm −2 in alkaline, acidic, and neutral media, respectively. It also puts forward the anion‐exchange‐membrane water electrolyzer with a low cell voltage of 1.65 V at 1 A cm −2 under 60°C. The device further presents a durable operation with a small voltage decay of 0.132 µV h −1 over 500 h at 0.5 A cm −2 . This work navigates a viable pathway to rationalize efficient water splitting catalysts through metal‐nonmetal bond engineering.
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