The practice of reaction window in an electrocatalytic on-chip microcell

Hang Xia, Xiaoru Sang, Zhiwen Shu, Zude Shi, Zefen Li, Shasha Guo, Xiuyun An, Caitian Gao (), Fucai Liu, Huigao Duan, Zheng Liu () and Yongmin He ()
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Hang Xia: Hunan University
Xiaoru Sang: Hunan University
Zhiwen Shu: Hunan University
Zude Shi: Hunan University
Zefen Li: University of Electronic Science and Technology of China
Shasha Guo: Nanyang Technological University
Xiuyun An: Hunan University
Caitian Gao: Hunan University
Fucai Liu: University of Electronic Science and Technology of China
Huigao Duan: Hunan University
Zheng Liu: Nanyang Technological University
Yongmin He: Hunan University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract To enhance the efficiency of catalysis, it is crucial to comprehend the behavior of individual nanowires/nanosheets. A developed on-chip microcell facilitates this study by creating a reaction window that exposes the catalyst region of interest. However, this technology’s potential application is limited due to frequently-observed variations in data between different cells. In this study, we identify a conductance problem in the reaction windows of non-metallic catalysts as the cause of this issue. We investigate this problem using in-situ electronic/electrochemical measurements and atom-thin nanosheets as model catalysts. Our findings show that a full-open window, which exposes the entire catalyst channel, allows for efficient modulation of conductance, which is ten times higher than a half-open window. This often-overlooked factor has the potential to significantly improve the conductivity of non-metallic catalysts during the reaction process. After examining tens of cells, we develop a vertical microcell strategy to eliminate the conductance issue and enhance measurement reproducibility. Our study offers guidelines for conducting reliable microcell measurements on non-metallic single nanowire/nanosheet catalysts.

Date: 2023
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DOI: 10.1038/s41467-023-42645-0

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