Issue 29, 2025

Surface amorphization advances activity and stability for acidic oxygen evolution

Abstract

The oxygen evolution reaction (OER) in acidic environments is crucial for various energy storage/conversion technologies. Enhancing acidic OER efficiency through precise optimization of the electronic structure at active metal sites remains a significant challenge. Due to structural flexibility and accessible active sites, amorphization offers a knob to enhance the activity of Ru-based catalysts. Here, we developed a RuO2/IrO2 composite catalyst characterized by a crystalline core and an amorphous surface structure. Density functional theory results indicate that surface amorphization can effectively lower the reaction energy barrier and accelerate electron transfer than its fully crystalline counterpart. Operando differential electrochemical mass spectrometry proved that surface amorphization inhibits the leaching of lattice oxygen. As a result, the RuO2/IrO2 composite demonstrates superior OER performance, achieving a low overpotential of 174 mV at 10 mA cm−2 and remarkable stability for 95 hours in a 0.5 M H2SO4 electrolyte. This work inspires new design ideas for high-performance acid electrocatalysts, providing insights for developing robust, efficient materials for sustainable energy applications.

Graphical abstract: Surface amorphization advances activity and stability for acidic oxygen evolution

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Article information

Article type
Paper
Submitted
08 Mar 2025
Accepted
15 Jun 2025
First published
16 Jun 2025
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2025,13, 23706-23714

Surface amorphization advances activity and stability for acidic oxygen evolution

M. B. Hussain, M. Ahmad, S. Hussain, R. Javed, Z. Zafar, D. Zhou, A. Surulinathan, R. Feng, X. Fu, S. Liu and J. Luo, J. Mater. Chem. A, 2025, 13, 23706 DOI: 10.1039/D5TA01910A

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