Electronically Modulated FeNi Composite by CeO₂ Porous Nanosheets for Water Splitting at Large Current Density

Authors

Ming-Yu Ding, Guangxi Key Laboratory of Electrochemical Energy Materials, College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning 530004, China
Wen-Jie Jiang, Guangxi Key Laboratory of Electrochemical Energy Materials, College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning 530004, China
Tian-Qi Yu, Guangxi Key Laboratory of Electrochemical Energy Materials, College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning 530004, China
Xiao-Yan Zhuo, Guangxi Key Laboratory of Electrochemical Energy Materials, College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning 530004, China
Xiao-Jing Qin, Guangxi Key Laboratory of Electrochemical Energy Materials, College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning 530004, China
Shi-Bin Yin, Guangxi Key Laboratory of Electrochemical Energy Materials, College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning 530004, ChinaFollow

Document Type

Article

Corresponding Author(s)

Shi-Bin Yin(yinshibin@gxu.edu.cn)

Abstract

Exploiting highly activity 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 NiFe₂O₄-Fe₂₄N₁₀-CeO₂/NF exhibits outstanding oxygen and hydrogen evolution reaction (OER and HER) activity (η1000 = 352 mV and η1000 = 429 mV). 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 stability. This study highlights a novel approach to design bifunctional non-noble metal catalysts for water splitting at large current density.

Graphical Abstract

Keywords

FeNi composite, hydrogen evolution reaction, oxygen evolution reaction, catalyst, water splitting

DOI

10.13208/j.electrochem.2208121

Online Date

11-21-2022

Recommended Citation

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, doi: 10.13208/j.electrochem.2208121.