Exploiting highly active and non-noble metal bifunctional catalysts at large current density is significant for the advancement of water electrolysis. In this work, CeO2 electronically structure modulated FeNi bimetallic composite porous nanosheets in-situ grown on nickel foam (NiFe2O4-Fe24N10-CeO2/NF) is synthesized. Electrochemical experiments show that the NiFe2O4-Fe24N10-CeO2/NF exhibited the outstanding activities toward both oxygen and hydrogen evolution reactions (OER and HER) (η1000 = 352 mV and η1000 = 429 mV, respectively). When assembled into a two-electrode system for overall water splitting (OWS), it only needs a low cell voltage of 1.81 V to drive 100 mA·cm−2. And it can operate stably at ±500 mA·cm-2 over 30 h toward OER, HER and OWS without significant activity changes. The reason could be assigned to the electronic modulating of CeO2 on FeNi composite, which can boost the intrinsic activity and optimize the adsorption of reaction intermediates. Moreover, the porous nanosheets in-situ grown on NF could enhance the contact of active site with electrolyte and facilitate the gas release, thus improving its chemical and mechanical stabilities. This study highlights a novel approach to design bifunctional non-noble metal catalysts for water splitting at large current density.
FeNi composite; hydrogen evolution reaction; oxygen evolution reaction; catalyst; water splitting
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Ming-Yu Ding, Wen-Jie Jiang, Tian-Qi Yu, Xiao-Yan Zhuo, Xiao-Jing Qin, Shi-Bin Yin.
Electronically Modulated FeNi Composite by CeO2 Porous Nanosheets for Water Splitting at Large Current Density[J]. Journal of Electrochemistry,
Available at: https://jelectrochem.xmu.edu.cn/journal/vol29/iss5/2