摘要
水电解制氢技术在可再生能源发电电力消纳中具有重要的应用潜力,而析氧反应(OER)因动力学过程缓慢,制约了水电解效率提升。镍铁层状氢氧化物(NiFe LDH)制备简便、成本低廉、催化活性优异,是研究最广泛的碱性OER催化剂,但关于其在工业条件下的应用研究仍缺乏系统研究。本研究采用电沉积法在泡沫镍表面制备了自支撑镍铁层状氢氧化物催化剂,并对比分析其在三电极、阴离子交换膜单池以及工业碱水电解槽体系中的活性和稳定性,探究了不同工况下电极材料的催化活性演变规律。研究结果显示,NiFe LDH的催化活性在不同测试条件下均出现一定程度的衰减,衰减程度由高到低为:工业级电解槽>膜单池>三电极体系。3种工况条件下NiFe LDH自支撑电极的电荷转移阻抗增加,电化学活性表面积降低。电解反应前后电极分析表明,工业碱水电解槽的高温高压环境促进了铁元素的溶出,引发电极微观结构破坏、活性组分流失以及晶相转变等现象,加速催化剂性能劣化。本研究为揭示NiFe LDH丰产元素电催化剂在实验室测试与工业电解装置间的差异提供了实验依据。
Water electrolysis is a promising route for sustainable hydrogen production and renewable energy storage.However,the overall efficiency is hindered by the sluggish kinetics of the oxygen evolution reaction(OER).Nickel-iron layered double hydroxides(NiFe LDHs)are among the most extensively studied catalysts for OER in alkaline media,owing to their simple synthesis,low cost,and excellent catalytic performance.Despite extensive research,systematic investigations under industrially relevant conditions remain limited.In this study,self-supported NiFe LDH catalysts were fabricated on nickel foam via electrodeposition,and their activity and stability were systematically evaluated across three systems:a three electrode configuration,an anion exchange membrane(AEM)single cell,and an industrial alkaline electrolyzer.Comparative analysis of their performance evolution under different operating conditions revealed that catalytic activity declined to varying degrees,following the order:industrial electrolyzer>AEM single cell>three-electrode system.In all systems,the electrodes exhibited increased charge-transfer resistance and reduced electrochemically active surface area after operation.Post-electrolysis characterization revealed that the high temperature,high-pressure environment of the industrial alkaline electrolyzer accelerates iron leaching,resulting in microstructural damage,loss of active components,and phase transformations that collectively exacerbate catalyst degradation.This study provides experimental insights into the performance disparity of NiFe LDH-based,earth-abundant catalysts between laboratory-scale tests and industrial electrolysis conditions.
作者
杨梧桐
刘芳名
周子尧
李金翰
于勐
程方益
YANG Wutong;LIU Fangming;ZHOU Ziyao;LI Jinhan;YU Meng;CHENG Fangyi(Nankai University College of Chemistry,Tianjin 300071,China;Haihe Laboratory of sustainable chemical transformations,Tianjin 300192,China;Nanke Youyi(Tianjin)Technology Co.,Ltd.,Tianjin 300192,China)
出处
《储能科学与技术》
北大核心
2025年第12期4509-4522,共14页
Energy Storage Science and Technology
基金
国家重点研发计划(2022YFA1504000)
国家自然科学基金(22121005,22409096,22402089)
天开高教科创园企业研发专项(23Y FZXYC00037)。
关键词
镍铁层状双氢氧化物
碱性电解水
三电极体系
电解槽
结构演变
nickel-iron layered double hydroxides
alkaline water electrolysis
three-electrode system
electrolyzer
structural evolution
