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Research Article

Sulfonated carbon dots modified IrO2 nanosheet as durable and high-efficient electrocatalyst for boosting acidic oxygen evolution reaction

Mengjie Ma1, Wenxiang Zhu1, Fan Liao1( ), Kui Yin1, Hui Huang1, Kun Feng1, Dongdong Gao1, Jinxin Chen1, Zenan Li1, Jun Zhong1, Lai Xu1( ), Yang Liu1( ), Mingwang Shao1( ), Zhenhui Kang1,2( )
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Soochow University, Suzhou 215123, China
Macao Institute of Materials Science and Engineering (MIMSE), Macau University of Science and Technology, Taipa, Macao 999078, China
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Graphical Abstract

Sulfonated carbon dots (SCDs) with charge storage capacity can regulate charge distribution of IrO2 nanosheets (IrO2 NS), improve the electron transfer rate of IrO2 NS, and further promote the oxygen evolution reaction (OER) reaction.

Abstract

Oxygen evolution reaction (OER) plays a crucial role in developing energy conversion and adjusting electronic structure of the electrocatalysts can effectively improve the catalytic activity and stability. However, it is a challenge to adjust the electronic structure on two-dimensional iridium dioxide nanosheets (IrO2 NS), which have the advantages of high atom utilization. Here, we regulate the surface properties of IrO2 NS through sulfonated carbon dots (SCDs) to promote the OER catalytic process. The catalyst IrO2 NS/SCDs-2 exhibited excellent catalytic activity with a lower overpotential of 180 mV than IrO2 NS (230 mV) at the current density of 10 mA·cm−2 in a 0.5 M H2SO4 solution. And after 160 h of stability testing, the overpotential of IrO2 NS/SCDs-2 only decreased by 4 mV. Moreover, transient potential scanning test can visually demonstrate that the addition of SCDs improves the conductivity of the catalyst and increases the electron transfer rate.

Keywords

sulfonated carbon dotsoxygen evolution reactionelectrocatalysistransient potential scanning

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Nano Research
Volume 17 Issue 9,
September 2024
Pages 8017-8024
DOI: 10.1007/s12274-024-6829-5
Cite this article:
Ma M, Zhu W, Liao F, et al. Sulfonated carbon dots modified IrO2 nanosheet as durable and high-efficient electrocatalyst for boosting acidic oxygen evolution reaction. Nano Research, 2024, 17(9): 8017-8024. https://doi.org/10.1007/s12274-024-6829-5
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Catalysis

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Received: 28 April 2024
Revised: 07 June 2024
Accepted: 14 June 2024
Published: 12 July 2024
© Tsinghua University Press 2024
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