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Research Article

Di-defects synergy boost electrocatalysis hydrogen evolution over two-dimensional heterojunctions

Yan Cui1, Xiaoyu Guo1, Jian Zhang2,3( ), Xing'ao Li2,3( ), Xinbao Zhu4, Wei Huang3,5
Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and TelecommunicationsNanjing 210003 China
New Energy Technology Engineering Lab of Jiangsu Province School of Science Nanjing University of Posts & Telecommunications (NUPT)Nanjing 210023 China
Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing University of Posts & Telecommunications (NUPT)Nanjing 210023 China
College of Chemical Engineering Nanjing Forestry UniversityNanjing 210037 China
Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU), 127 West Youyi RoadXi'an 710072 China
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Abstract

Electronic modulation on the inert basal plane of transition-metal dichalcogenides(TMDs) through vacancy defect excitation, although extremely challenging, is urgent for understanding the factors that impact the hydrogen evolution reaction (HER) catalytic activity. Here, ultrathin WS2 nanosheets with precise quantitative single atomic S-vacancy on the inert basal plane were flexible prepared through hydrogen peroxide etching strategy. The as-synthesized single atomic S-vacancy defect WS2 (SVD-WS2) nanoflake with the activated basal plane exhibited an impressive overpotential of 137 mV at a current density of 10 mA·cm-2 and a Tafel slope of 53.9 mV·dec-1. Furthermore, anchoring on the defect graphene matrix, the assembled two-dimensional (2D) stacking heterojunction exhibits further enhanced HER catalytic activity (an overpotential of 108 mV vs. 10 mA·cm-2 and a Tafel slope of 48.3 mV·dec-1) and stability (~ 10% decline after 9, 000 cycles), which attributed to the electronic structure modulation from the synergetic interactions between SVD-WS2 and defect graphene. Our finding provides a smart defects introduce strategy to trigger high-efficiency hydrogen evolution over WS2 nanosheets and a general 2D heterojunctions fabricated inspiration based on strong interaction interface.

Keywords

S-vacanciesdefect graphenehydrogen evolution reactionheterojunctions

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Nano Research
Volume 15 Issue 1,
January 2022
Pages 677-684
DOI: 10.1007/s12274-021-3545-2
Cite this article:
Cui Y, Guo X, Zhang J, et al. Di-defects synergy boost electrocatalysis hydrogen evolution over two-dimensional heterojunctions. Nano Research, 2022, 15(1): 677-684. https://doi.org/10.1007/s12274-021-3545-2
Topics:
Hydrogen evolution reaction

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Received: 27 April 2021
Revised: 27 April 2021
Accepted: 28 April 2021
Published: 29 May 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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