CeO2电子调控FeNi纳米片大电流密度电解水催化剂

doi:10.13208/j.electrochem.2208121

摘要/Abstract

摘要：

开发高活性的大电流密度非贵金属双功能催化剂对于电解水制氢的发展意义重大。本文通过水热法和高温退火处理制备了自生长在泡沫镍上的CeO₂电子调控的FeNi双金属复合物多孔纳米片(NiFe₂O₄-Fe₂₄N₁₀-CeO₂/NF)。电化学测试结果表明,NiFe₂O₄:-Fe₂₄N₁₀-CeO₂/NF 在1.0 mol·L^-1KOH电解液中具有出色的析氧和析氢反应（OER和HER)活性，在±1000 mA cm^-2电流密度下所需的过电位分别为352 mV和429 mV。将其组装成电解水（OWS）两电极体系，只需1.81V的电池电压就能达到100 mA ·cm^-2的电流密度。对于OER、HER和OWS，可以在+500 mA cm^-2的电流密度下稳定运行30小时，其优异的大电流密度催化性能可以归功于CeO₂对于FeNi复合物的电子结构调控增强了催化剂的本征活性和反应中间体的吸附。原位生长在泡沫镍(NF)上的多孔纳米片可以增强活性位点与电解质的接触，并利于气体产物的释放，从而提高其化学稳定性和机械稳定性。本工作为制备双功能非贵金属电解水催化剂提供了一种新思路。

关键词: FeNi复合物, 析氢反应, 析氧反应, 催化剂

Abstract:

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.

Key words: FeNi composite, hydrogen evolution reaction, oxygen evolution reaction, catalyst

丁明宇, 蒋文杰, 余天琦, 卓小燕, 覃晓静, 尹诗斌. CeO₂电子调控FeNi纳米片大电流密度电解水催化剂[J]. 电化学（中英文）, 2023, 29(5): 2208121.

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, 2023, 29(5): 2208121.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.2208121

https://electrochem.xmu.edu.cn/CN/Y2023/V29/I5/2208121

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CeO₂电子调控FeNi纳米片大电流密度电解水催化剂

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

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