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Title: Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution
Authors: Zhao, Yunxing
Tang, Michael T.
Wu, Sudong
Geng, Jing
Han, Zhaojun
Chan, Karen
Gao, Pingqi
Li, Hong
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Zhao, Y., Tang, M. T., Wu, S., Geng, J., Han, Z., Chan, K., . . . Li, H. (2020). Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution. Journal of Catalysis, 382, 320-328. doi:10.1016/j.jcat.2019.12.028
Journal: Journal of Catalysis
Abstract: Sulfur (S) vacancies in MoS2 have been found to act as a new active center, which shows an unprecedented intrinsic HER activity under elastic strain. However, such S-vacancies are unstable and the activities are very sensitive to the vacancy concentration. A strategy to stabilize these abundant active sites is thus highly desirable. Herein, we rationally design a catalyst system to stabilize S-vacancies in the basal plane of 2H-MoS2 supported on defective vertical graphene network (VGN). The energetically favorable line-shaped S-vacancies in MoS2 show a consistently high HER activity that is insensitive to S-vacancy concentration. Moreover, the defective graphene support effectively stabilizes these S-vacancies. The optimized catalyst exhibits a superior HER activity with overpotential of 128 mV at 10 mA cm−2 and Tafel slope of 50 mV dec−1. Most importantly, the catalyst shows greatly increased stability over 500 h; benchmarking the most stable nonprecious HER catalyst in acidic media to date.
ISSN: 0021-9517
DOI: 10.1016/j.jcat.2019.12.028
Rights: © 2019 Elsevier Inc. All rights reserved. This paper was published in Journal of Catalysis and is made available with permission of Elsevier Inc.
Fulltext Permission: embargo_20221231
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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