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Enhancing the oxygen evolution reaction performance of pyrochlore oxide through amorphous/crystalline heterostructure engineering
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DOI：10.1016/j.jpowsour.2025.236802.png)
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Abstract
En 中文
Efficient and durable electrocatalysts for the oxygen evolution reaction (OER) are vital for advancing renewable energy technologies, particularly in water-splitting systems. Herein, we report a novel surface engineering strategy to enhance the OER performance of Bi2Ru2O7 (BRO) pyrochlore oxide by constructing amorphous/ crystalline heterostructures. Using four surface treatment agents-nitric acid, hydrogen peroxide, vitamin C, and sodium borohydride-we successfully induced an amorphous RuOx layer on crystalline BRO, significantly increasing specific surface area, oxygen vacancies, and active sites. Among these, vitamin C-treated BRO (BROVC) exhibited exceptional OER activity, achieving a low overpotential of 297 mV at 10 mA cm- 2 in 1 M KOH, outperforming untreated BRO (349 mV), other treated variants, and commercial RuO2 (410 mV). Density functional theory (DFT) calculations reveal that the RuOx/BRO heterostructure shifts the d-band center, optimizing adsorption energies of OER intermediates and reducing overpotential. This work demonstrates that tailoring amorphous/crystalline interfaces via surface treatment offers a powerful approach to designing high performance OER catalysts, providing critical insights into structural engineering for electrocatalytic applications.
Keywords:
Amorphous/crystalline structure
Pyrochlore oxide
Surface treatment
Journal
IF:
7.9
Papers:
3.7W
Citations:
15.0W
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