首页|Lattice oxygen-mediated Co-O-Fe formation in Co-MOF via Fe doping and ligand design for efficient oxygen evolution

Lattice oxygen-mediated Co-O-Fe formation in Co-MOF via Fe doping and ligand design for efficient oxygen evolution

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The rational design of metal-organic frameworks(MOFs)provides potential opportunities for improv-ing energy conversion efficiency.However,developing efficient MOF-based electrocatalysts remains highly challenging.Herein,a strategy involving strain engineering is developed to promote the electrocatalytic performance of MOFs by optimizing electronic configuration and improving the active site.As expected,the optimized CoFe-BDC-NO2 exhibits a low overpotential of 292 mV at 10 mA cm-2 and a small Tafel slope of 31.6 mV dec-1 as oxygen evolution reaction(OER)electrocatalyst.Notably,when CoFe-BDC-NO2 is prepared on Nickel foam(NF),the overpotential is only 345 mV at 1 A cm-2,which ensures efficient water oxidation properties.Integrating CoFe-BDC-NO2/NF anode in membrane electrode assembly(MEA)for overall water splitting and CO2 reduction reaction(CO2RR)tests,the results show that the cell volt-ages of CoFe-BDC-NO2/NF are 3.14 and 3.09 V at 300 mA cm-2(25 ℃),respectively,indicating that MOFs have various practical application prospects.The research of the structure-performance relationship re-veals the lattice oxygen oxidation mechanism(LOM)where the Co-O-Fe bond is formed during the OER process by changing the electronic environment and coordination structure of CoFe-BDC-NO2,and with high valence Co as active center,which provides a deep understanding of the structure design of MOFs and their structural transformation during OER.

Metal-organic frameworksElectrocatalystLattice strainLattice oxygen mechanismOxygen evolution reaction

Tao Zhao、Dazhong Zhong、Qiang Fang、Xin Zhao、Runxin Du、Genyan Hao、Guang Liu、Jinping Li、Qiang Zhao

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College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China

Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan 030024,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Program of Shanxi Province

219751752187820222308246202203021212266

2024

10.1016/j.jmst.2023.11.070

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.189(22)