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Influence of Conductive Substrate Engineering on the Urea Oxidation Performance of CoFe-Oxyhydroxide Electrocatalysts
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DOI：10.1002/cctc.70904.png)
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Abstract
En 中文
The rational design of integrated electrodes by growing active catalysts directly on conductive substrates is a critical strategy for enhancing the performance of electrocatalytic urea oxidation reaction (UOR). In this work, CoFe oxyhydroxide (CoFeOOH) was uniformly deposited on four different three-dimensional substrates, including nickel foam (NF), copper foam (CF), carbon cloth (CC), and titanium foam (TF), via a facile one-step hydrothermal method. Systematic physicochemical and electrochemical characterizations reveal that the substrate type profoundly affects the morphology, electronic structure, interfacial charge transfer, and ultimately the UOR activity of the CoFeOOH catalysts. Among them, the NF-supported catalyst (CoFeOOH/NF) exhibits the most favorable structural and electronic properties, including strong interfacial coupling, abundant active sites, and optimized adsorption of urea intermediates. As a result, CoFeOOH/NF delivers exceptional UOR performance in 1 M KOH + 0.33 M urea, requiring only 1.506 V (vs. RHE) to achieve 100 mA cm−2 and showing a low Tafel slope of 17.03 mV dec−1. Furthermore, it demonstrates outstanding long-term stability over 100 h of continuous operation. This work highlights the decisive role of substrate engineering in modulating the electrocatalytic properties of oxyhydroxide-based materials and provides a practical guideline for designing high-performance electrodes for energy-saving hydrogen production coupled with urea oxidation.
Keywords:
hydrogen production
integrated electrode
substrate effect
urea oxidation reaction
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