双金属片
双功能
交换电流密度
超亲水性
化学
膜
催化作用
电流密度
扩散
电解
电解质
聚合物电解质膜电解
电极
材料科学
化学工程
电化学
无机化学
离子交换
离子
物理化学
润湿
热力学
复合材料
有机化学
物理
工程类
塔菲尔方程
生物化学
量子力学
作者
Lei Wan,Ziang Xu,Peican Wang,Pengfei Liu,Qin Xu,Baoguo Wang
标识
DOI:10.1016/j.cej.2021.133942
摘要
Anion exchange membrane water electrolysis (AEMWE) is considered as a promising approach to large-scale hydrogen production. However, the performance of AEMWE is limited by the slow reaction kinetics of the catalyst and poor mass transport of gases and electrolyte at high current densities. Herein, we report Fe0.2Ni0.8-P0.5S0.5 nanoisland arrays as an efficient bifunctional catalyst with ultralow overpotentials of 85 mV (for HER) and 180 mV (for OER) to achieve a current density of 10 mA cm−2. Density functional theory calculations reveal that bimetallic doping of Fe0.2Ni0.8-P0.5S0.5 effectively improve the intrinsic activity. Particularly, the Fe0.2Ni0.8-P0.5S0.5 electrode is endowed with superhydrophilicity and aerophobicity, which not only facilitates to the exposure of active sites, but also markedly enhance gas and electrolye diffusion at high current density. Therefore, the AEMWE based on the Fe0.2Ni0.8-P0.5S0.5 bifunctional electrodes delivers a current density of 2.5 A cm−2 at 2.0 V. Moreover, the AEMWE maintained long-term operation without obvious performance degradation for 300 h.
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