A crucial role of enhanced Volmer-Tafel mechanism in improving the electrocatalytic activity via synergetic optimization of host, interlayer, and surface features of 2D nanosheets

Jin, Xiaoyan ¹Kim, Min Gyu ²Hwang, Seong-Ju ¹Kim, Hyun Kyu ¹Jang, Haeseong²

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作者信息

1. Yonsei Univ
2. Pohang Univ Sci & Technol POSTECH
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Abstract

High-performance electrocatalysts have attracted growing interest because of their crucial roles in renewable energy technologies. In this study, the host, interlayer, and surface features of electrocatalytically-active 2D nanosheets (NSs) are systematically controlled with the synergetic combination of host-guest co-engineering and surface modification to develop a novel synthetic strategy for efficient electrocatalysts. Molecular-level control of interfacial electronic coupling and surface reactivity can be achieved by the self-assembly of MoS2/ RuO2 NS mixtures with variable-sized tetraalkylammonium cations and subsequent thermal aging. The resulting optimization of the operation mechanisms of restacked MoS2/RuO2 NSs effectively improves the electrocatalyst functionality for hydrogen evolution reaction (HER). The extensive modifications of diverse structural and morphological parameters allow the elucidation of a linear correlation between electrochemical active surface area and HER overpotential. Systematic in-situ spectroscopic analyses clearly demonstrate the crucial role of enhanced Volmer-Tafel mechanism in improving the electrocatalytic activity via enhancement of proton adsorption and interfacial electron transfer.

Key words

Host-guest co-engineering/Surface activation/Electrocatalysts/Volmer-Tafel mechanism/Electrochemical active surface area/MOS2/INTERCALATION/GRAPHENE/OXIDE

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量9

参考文献量53

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