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Self-Reconstructed Metal-Organic Framework-Based Hybrid Electrocatalysts for Efficient Oxygen Evolution.

Kunting Cai¹, Weibin Chen¹, Yinji Wan²

¹Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China.

Nanomaterials (Basel, Switzerland)

|July 26, 2024

Summary

Developing advanced metal-organic framework (MOF) catalysts for the oxygen evolution reaction (OER) is crucial. This study presents novel MOF-based electrocatalysts on nickel foam, with MET-Fe/NF showing superior performance and stability.

Keywords:

hybrid electrocatalysts metal–organic frameworks oxygen evolution reaction structure reconstruction

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Improving the efficiency and durability of electrocatalysts for the oxygen evolution reaction (OER) is essential for energy conversion technologies.
Metal-organic frameworks (MOFs) offer tunable structures but require refined synthesis for catalytic applications.

Purpose of the Study:

To develop and evaluate novel MOF- and metal-triazolate (MET)-based electrocatalysts for OER.
To investigate the performance and stability of these catalysts grown on nickel foam (NF) substrates.

Main Methods:

Solvothermal synthesis of MOF/MET nanostructures on nickel foam (NF) substrates.
Electrochemical characterization of the synthesized MET-M/NF (M = Fe, Co, Cu) electrocatalysts for OER.
In situ structural analysis to understand the catalytic mechanism.

Main Results:

MET-Fe/NF demonstrated excellent OER performance with a low overpotential of 122 mV at 10 mA cm⁻² and remarkable stability (>15 h).
In situ structural reconstruction of MET-Fe/NF led to the formation of highly active iron/nickel (oxy)hydroxides.
The MET-Fe/NF electrode required only 1.463 V for a current density of 10 mA cm⁻² in a two-electrode water-splitting setup.

Conclusions:

The developed MOF-based electrocatalysts, particularly MET-Fe/NF, show significant promise for efficient and stable oxygen evolution reactions.
In situ structural transformation is a key factor in enhancing the catalytic activity of these MOF-derived materials.
This research offers valuable insights for designing next-generation MOF-based catalysts for water splitting and other energy applications.