Affiliation:
1. College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
2. Department of Materials Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan
Abstract
AbstractNeutral oxygen evolution reaction (OER) with unique reactive environments exhibits extremely slow reaction kinetics, posing significant challenges in the design of catalysts. Herein, a built‐in electric field between the tungstate (Ni‐FeWO4) with adjustable work function and Lewis acid WO3 is elaborately constructed to regulate asymmetric interfacial electron distribution, which promotes electron accumulation of Fe sites in the tungstate. This decelerates the rapid dissolution of Fe under the OER potentials, thereby retaining the active hydroxyl oxide with the optimized OER reaction pathway. Meanwhile, Lewis acid WO3 enhances hydroxyl adsorption near the electrode surface to improve mass transfer. As expected, the optimized Ni‐FeWO4@WO3/NF self‐supporting electrode achieves a low overpotential of 235 mV at 10 mA cm−2 in neutral media and maintains stable operation for 200 h. Furthermore, the membrane electrode assembly constructed by such self‐supporting electrode exhibits robust stability for 250 h during neutral seawater electrolysis. This work deepens the understanding of the reconstruction of OER catalysts in neutral environments and paves the way for development of the energy conversion technologies.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Jiangsu Province
Fundamental Research Funds for the Central Universities
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
2 articles.
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