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Spin-State Modulation on Metal-Organic Frameworks for Electrocatalytic Oxygen Evolution.

Fan He1, Qiang Zheng2, Xiaoxuan Yang1

  • 1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 26, 2023
PubMed
Summary

Strain engineering and coordination regulation in a novel metal-organic framework (DD-Ni-NDA) enhance the oxygen evolution reaction (OER) by optimizing orbital hybridization and spin states for efficient catalysis.

Keywords:
metal-organic frameworksrapid reaction kineticsspin-state regulationtensile strainunsaturated coordination defects

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Oxygen evolution reaction (OER) kinetics are crucial for energy conversion technologies.
  • Catalyst performance is linked to transition metal d-orbital and oxygen p-orbital hybridization.
  • Optimizing intermediate adsorption/desorption barriers is key to efficient OER.

Purpose of the Study:

  • To develop a strategy for enhancing OER kinetics through strain engineering and coordination regulation.
  • To synthesize and characterize a novel metal-organic framework (DD-Ni-NDA) for OER applications.
  • To elucidate the mechanism of OER enhancement at the electronic structure level.

Main Methods:

  • Synthesis of Ni-2,6-naphthalenedicarboxylic acid metal-organic framework (DD-Ni-NDA) nanosheets.
  • Electrochemical characterization including OER overpotential and current density measurements.
  • Integration with alkaline anion exchange membrane electrolyzers and BiVO4 photoanodes.
  • Theoretical calculations including molecular orbital hybridization and spin state analysis.

Main Results:

  • DD-Ni-NDA nanosheets achieved a low OER overpotential of 260 mV at 10 mA cm⁻².
  • High current densities of 200 and 500 mA cm⁻² were reached at cell voltages of 1.6 and 2.1 V, respectively.
  • Demonstrated highly active solar-driven water splitting when loaded on a BiVO4 photoanode.
  • Revealed that tensile strain and coordination defects regulate Ni spin states, facilitating spin-dependent charge transfer.

Conclusions:

  • Strain engineering and coordination regulation effectively enhance OER performance.
  • The DD-Ni-NDA material shows significant potential for efficient electrochemical and solar-driven water splitting.
  • Understanding the role of spin state in molecular orbital hybridization provides insights for designing advanced OER catalysts.