摘要
碱性阴离子交换膜水电解(AEMWE)作为绿氢规模化制备的重要研究方向,其阳极端析氧反应(OER)受四电子转移过程动力学缓慢及高过电位限制,严重制约了AEMWE系统能效提升。因此,开发高效稳定的OER电催化剂,对降低反应能垒和推动AEMWE产业化具有关键意义。为了构建兼具高催化活性(η_(500)<300 mV,Tafel斜率<40 mV·dec^(-1))、高电化学耐久性(>100 h)和强机械稳定性的碱性析氧催化剂,提出了一种创新界面工程策略用以提升电极催化活性及稳定性。通过两步沉积法制备了新型电极材料mNiFe/NF^(*)。在合理利用Cl^(-)离子腐蚀以改善基底微观形貌的基础上,采用室温沉积在改性基底表面构筑稳定且致密的NiFe叠层结构(纳米片/花状LDH)。得益于Cl^(-)腐蚀改性与稳定叠层LDH构建的协同效应,mNiFe/NF^(*)的电催化OER性能表现出色(η_(100)/η_(500)=225/298 mV,Tafel斜率39.3 mV·dec^(-1)),并具备优异的电化学稳定性(>150 h@100 mA·cm^(-2))。这可作为设计高活性,长寿命AEMWE阳极材料的有效策略。
Alkaline anion exchange membrane water electrolysis(AEMWE)stands as a pivotal research direction for large-scale green hydrogen production.The oxygen evolution reaction(OER)at the anode,hindered by sluggish 4-electron transfer kinetics and high overpotential,critically constrains the energy efficiency enhancement of AEMWE systems.Consequently,developing highly efficient and stable OER electrocatalysts holds paramount significance for reducing reaction energy barriers and advancing AEMWE industrialization.To construct alkaline OER catalysts integrating high catalytic activity(η_(500)<300 mV,Tafel slope<40 mV·dec^(-1)),superior electrochemical durability(>100 h),and robust mechanical stability,an innovative interfacial engineering strategy is proposed herein to enhance both catalytic activity and electrode stability.A novel electrode material,mNiFe/NF^(*),was synthesized via a two-step deposition method.By strategically leveraging Cl^(-)ion etching to optimize the substrate micro-morphology,a stable and compact NiFe stacked structure(nanosheet/flower-like LDH)was constructed on the modified substrate surface through room temperature deposition.The synergistic effects of Cl^(-)-mediated etching modification and stabilized LDH layered architecture endow mNiFe/NF^(*)with exceptional electrocatalytic OER performance(η_(100)/η_(500)=225/298 mV,Tafel slope=39.3 mV·dec^(-1))and outstanding electrochemical stability(>150 h@100 mA·cm^(-2)).This method could be a powerful strategy for designing highly active,long-lived AEMWE anode materials.
作者
陈策能
罗勇
张睿谦
赵腾腾
龙志
张杰
任艳蓉
CHEN Ceneng;LUO Yong;ZHANG Ruiqian;ZHAO Tengteng;LONG Zhi;ZHANG Jie;REN Yanrong(Center for Photonics Information and Energy Materials,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Chemistry and Molecular Sciences,Henan University,Kaifeng 475004,Henan,China)
出处
《化学研究》
2025年第6期552-560,共9页
Chemical Research
基金
国家自然科学基金项目(52203284)
深圳科技计划项目(GJHZ20220913143801003)。
关键词
碱性阴离子交换膜水电解
析氧反应
层状双氢氧化物
alkaline anion exchange membrane water electrolysis
oxygen evolution reaction
layered double hydroxide
