Dual regulation both intrinsic activity and mass transport for self-supported electrodes using in anion exchange membrane water electrolysis

[Display omitted] •Fe0.2Ni0.8-P0.5S0.5 nanoarrays are prepared by the electrodeposition method.•Bimetallic doping improves the electrode intrinsic activity.•Bimetallic doping modulates surface hydrophobic/hydrophilic properties.•The bifunctional electrodes are utilized for high-efficiency AEMWE. Ani...

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Vydáno v:Chemical engineering journal (Lausanne, Switzerland : 1996) Ročník 431; s. 133942
Hlavní autoři: Wan, Lei, Xu, Ziang, Wang, Peican, Liu, Peng-Fei, Xu, Qin, Wang, Baoguo
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier B.V 01.03.2022
Témata:
Anion exchange membrane water electrolysis
Catalyst layer
DFT calculations
Electrodeposition
Quaternary Fe-Ni-P-S
Electrodeposition
Catalyst layer
Quaternary Fe-Ni-P-S
Anion exchange membrane water electrolysis
DFT calculations
ISSN:1385-8947, 1873-3212
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Shrnutí:[Display omitted] •Fe0.2Ni0.8-P0.5S0.5 nanoarrays are prepared by the electrodeposition method.•Bimetallic doping improves the electrode intrinsic activity.•Bimetallic doping modulates surface hydrophobic/hydrophilic properties.•The bifunctional electrodes are utilized for high-efficiency AEMWE. 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.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2021.133942