Dual regulation both intrinsic activity and mass transport for self-supported electrodes using in anion exchange membrane water electrolysis
Dual regulation both intrinsic activity and mass transport for self-supported electrodes using in anion exchange membrane water electrolysis
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阴离子交换膜水电解中自支撑电极的内在活性和传质的双重调节
DOI：
10.1016/j.cej.2021.133942
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Baoguo Wang
中科院分区：
文献类型：
--
作者：
Lei Wan;Ziang Xu;Peican Wang;Peng-FeiLiu;Qin Xu;Baoguo Wang
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-P0.5S0.5nanoisland 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-P0.5S0.5effectively improve the intrinsic activity. Particularly, the Fe0.2Ni0.8-P0.5S0.5electrode 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-P0.5S0.5bifunctional electrodes delivers a current density of 2.5 A cm−2at 2.0 V. Moreover, the AEMWE maintained long-term operation without obvious performance degradation for 300 h.
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