Quenching-assisted surface functionalization of metal oxide for highly enhanced electrocatalytic urea oxidation

IF 4.5 3区化学 Q1 Chemical Engineering

Journal of Electroanalytical Chemistry Pub Date : 2023-08-11 DOI:10.1016/j.jelechem.2023.117706

Lei Chen , Wen-Da Zhang , Jingguo Yang , Jiangyong Liu , Zhi-Guo Gu , Xiaodong Yan

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Abstract

Urea oxidation reaction (UOR) is considered as a good substitute for oxygen evolution reaction (OER) because of its low theoretical onset potential. Surface modification is an effective strategy to tune the catalytic activity of the catalysts towards UOR. Here, we developed a facile and universal quenching strategy to prepare sulfate-modified NiO nanosheets (NiO@NF-20S). Compared with the pristine NiO nanosheets, the electrocatalytic performance of the NiO@NF-20S is greatly improved, showing a small potential of 1.40 V vs. RHE to deliver a current density of 200 mA cm⁻² as well as robust electrochemical stability. The outstanding electrocatalytic performance of the NiO@NF-20S is mainly ascribed to the improved surface wettability and the promoted Ni²⁺/Ni³⁺ redox reaction. The quenching strategy can be expanded to not only various kinds of functional groups from nitric acid and phosphoric acid but also other metal oxides such as NiCoO_x and NiCrO_x. This work provides a new avenue to the design of surface-functionalized metal oxide catalysts for electrocatalysis.

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高强度电催化尿素氧化用金属氧化物的淬火辅助表面功能化

尿素氧化反应(UOR)因其较低的理论起效电位而被认为是析氧反应(OER)的良好替代品。表面改性是使催化剂的催化活性向UOR方向调整的一种有效策略。在这里，我们开发了一种简单而通用的淬火策略来制备硫酸盐修饰的NiO纳米片(NiO@NF-20S)。与原始的NiO纳米片相比，NiO@NF-20S的电催化性能得到了极大的提高，相对于RHE，其电势仅为1.40 V，电流密度为200 mA cm -2，并且具有良好的电化学稳定性。NiO@NF-20S优异的电催化性能主要归功于其表面润湿性的改善和Ni2+/Ni3+氧化还原反应的促进。淬火策略不仅可以扩展到硝酸和磷酸中的各种官能团，还可以扩展到其他金属氧化物如NiCoOx和NiCrOx。本研究为电催化用表面功能化金属氧化物催化剂的设计提供了一条新的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering

CiteScore

7.50

自引率

6.70%

发文量

912

审稿时长

>12 weeks

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.