Ruthenium-cobalt nano-oxide coupler with enhanced water dissociation for oxidation

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Applied Catalysis A: General Pub Date : 2024-05-11 DOI:10.1016/j.apcata.2024.119795

Weiwei Quan , Yuxi Hou , Jiajun Luo , Dongquan Yang , Yingbin Lin , Zhensheng Hong , Yiyin Huang , Hurong Yao , Rui Yang

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Abstract

Heterogeneous oxide couplers represent a type of emerging composite materials with inherently outstanding interface properties for electrocatalytic applications. In this study, we fabricate a Ru-Co nano-oxide coupler that enables internal electron transfer between Ru and Co elements. The catalyst exhibits superior oxygen evolution reaction (OER) performance compared to commercial RuO₂, with mere 260 mV overpotential at 10 mA cm⁻². The exchange current density (i₀) for RuO_2/Co₃O₄ is enhanced by three orders of magnitude compared to commercial RuO₂. Electrochemical characterizations and computational analysis reveal that the coupling of Co₃O₄ and RuO₂ enhances the surface's capability for water dissociation on the interface Ru sites, thereby initiating OER. The exceptional performance of RuO₂/Co₃O₄ enables water splitting via a single-cell AA battery configuration that utilizes a RuO₂/Co₃O₄ anode || Pt/C cathode setup. This accomplishment underscores the potential of RuO₂/Co₃O₄ for effective and sustainable electrochemical water splitting applications.

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钌-钴纳米氧化物耦合剂具有增强的水解离氧化功能

异质氧化物耦合剂是一种新兴的复合材料，在电催化应用中具有固有的出色界面特性。在本研究中，我们制备了一种 Ru-Co 纳米氧化物耦合剂，可实现 Ru 和 Co 元素之间的内部电子转移。与商用 RuO2 相比，该催化剂表现出卓越的氧进化反应（OER）性能，在 10 mA cm-2 条件下仅有 260 mV 的过电位。与商用 RuO2 相比，RuO2/Co3O4 的交换电流密度（i0）提高了三个数量级。电化学特性分析和计算分析表明，Co3O4 和 RuO2 的耦合增强了表面 Ru 位点上水解离的能力，从而启动了 OER。RuO2/Co3O4 的卓越性能使其能够通过单节 AA 电池配置（利用 RuO2/Co3O4 阳极 | | Pt/C 阴极设置）进行水分离。这一成果凸显了 RuO2/Co3O4 在有效和可持续的电化学水分离应用方面的潜力。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.