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Title: Ultrastable molybdenum disulfide-based electrocatalyst for hydrogen evolution in acidic media
Authors: Zhao, Yunxing
Hwang, Jeemin
Tang, Michael T.
Chun, Hoje
Wang, Xingli
Zhao, Hu
Chan, Karen
Han, Byungchan
Gao, Pingqi
Li, Hong
Keywords: Engineering::Mechanical engineering
Issue Date: 2020
Source: Zhao, Y., Hwang, J., Tang, M. T., Chun, H., Wang, X., Zhao, H., . . . Li, H. (2020). Ultrastable molybdenum disulfide-based electrocatalyst for hydrogen evolution in acidic media. Journal of Power Sources, 456, 227998-. doi:10.1016/j.jpowsour.2020.227998
Project: 2018-T1-001-051
Journal: Journal of Power Sources
Abstract: Despite the incredible success in reducing the overpotential of nonprecious catalysts for acidic hydrogen evolution reaction (HER) in the past few years, the stability of most platinum-free electrocatalysts is still poor. Here, we report an ultrastable electrocatalyst for acidic HER based on two-dimensional (2D) molybdenum disulfide (MoS2) doped with trace amount of palladium (<5 μg cm−2), which creates sulfur vacancies (S-vacancies). The optimized catalyst shows stable operation over 1000 h at 10 mA cm−2 with overpotential of 106 mV. The MoS2 catalyst is stabilized on a defective vertical graphene support, where the strong interaction at the 2D-2D interface increases the adhesion between the catalyst and the support. Palladium (Pd) doping generates rich sulfur vacancies in MoS2 that have a twofold role: (1) increasing hydrogen adsorption energy, which enhances activity; and (2) further increasing the adhesion between graphene support and defective MoS2, and thus enhancing stability. Complementary theoretical studies reveal the reaction pathways for substitutional doping, where the Mo-vacancy sites are prior to be doped by Pd. Our work thus offers a strategy for making stable, efficient, and earth-abundant HER catalysts with strong potential to replace platinum for PEM electrolysis.
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2020.227998
Rights: © 2020 Elsevier B.V. All rights reserved. This paper was published in Journal of Power Sources and is made available with permission of Elsevier B.V.
Fulltext Permission: embargo_20221231
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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