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Programmable Active Phase Reconstruction in Metal-Organic Framework Toward High-Efficient Oxygen Evolution.

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  • 1School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.

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This study introduces a novel nickel-based metal-organic framework (MOF) pre-catalyst. This engineered material demonstrates superior oxygen evolution reaction (OER) performance by precisely controlling its structural evolution for enhanced electrocatalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Rational design of catalytic materials is crucial for efficient catalysis.
  • Controlling dynamic structural evolution in situ can optimize active phases.
  • Metal-organic frameworks (MOFs) offer tunable platforms for catalyst development.

Purpose of the Study:

  • To develop a 2D ultrathin nickel-based MOF pre-catalyst for the oxygen evolution reaction (OER).
  • To investigate multimetallic electronic cooperativity for hierarchical regulation of structural evolution.
  • To achieve OER performance superior to benchmark ruthenium dioxide (RuO2).

Main Methods:

  • Fabrication of a 2D ultrathin nickel-based MOF with tailored cobalt-iron co-substitution.
  • Controlled reconstruction of the MOF in alkaline media to form ligand-anchored nickel oxyhydroxide active phases.
  • Analysis of multimetallic electronic interplay and its effect on catalytic pathways.

Main Results:

  • The engineered MOF exhibited superior OER performance compared to RuO2.
  • Co-substitution strategically controlled MOF flexibility and promoted reconstruction.
  • Modulation of reconstructed phases enhanced metal-oxygen electronic interplay and optimized catalytic pathways.

Conclusions:

  • Multimetallic electronic interplay in MOF-derived active phases provides programmed optimization of catalytic activity.
  • Dynamic structural evolution can be precisely controlled to enhance electrocatalyst design.
  • This approach offers a promising strategy for developing high-efficiency electrocatalysts.