首页|Surface reconstruction and structural transformation of two-dimensional Ni-Fe MOFs for oxygen evolution in seawater media
Surface reconstruction and structural transformation of two-dimensional Ni-Fe MOFs for oxygen evolution in seawater media
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As a four-electron transfer reaction,oxygen evolution reaction(OER)is limited by large overpotential and slow kinetics.Here,we in-situ synthesized two-dimensional(2D)Ni-Fe metal-organic framework nanosheets on nickel foam(NixFe-TPA/NF,TPA=terephthalic acid)for oxygen evolution in alkaline and alkaline seawater electrolytes.In 1 M KOH,Ni3Fe-TPA/NF shows a low overpotential(η10)of 189 mV at 10 mA·cm-2 and an ultra-low overpotential of only 260 mV at 500 mA·cm-2.In alkaline seawater,Ni3Fe-TPA/NF still provides impressive OER performance,with an η10 of 265 mV.In-situ Raman characterization results show that the phase transition occurs during the OER,and Ni3FeOOH with more oxygen vacancies is in-situ formed,reducing the OER energy barrier.Density functional theory(DFT)reveals that the synergy between Ni and Fe reduces the energy barrier and accelerates the rate-determining step.In addition,the ultra-thin 2D sheet structure and the close combination of Ni3FeOOH and highly conductive NF support ensure the high catalytic OER activity.Therefore,the surface reconstruction and structural modification strategy can be used to design and prepare high-performance OER electrocatalysts for energy-related applications.
density functional theory(DFT)calculationNi3FeOOHoxygen evolution reactionseawater electrolysissurface reconstruction
Institute of Physical Chemistry,College of Chemistry,Jilin University,Changchun 130021,China
The Second Hospital of Jilin University,Changchun 130021,China
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China
Laboratory of Theoretical and Computational Chemistry,Institute of Theoretical Chemistry,College of Chemistry,Changchun 130023,China
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National Natural Science Foundation of ChinaNatural Science Foundation of Jilin ProvinceNatural Science Foundation of Jilin ProvinceEducation Department of Jilin ProvinceEducation Department of Jilin Province
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