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|Title:||Ultrastable molybdenum disulfide-based electrocatalyst for hydrogen evolution in acidic media||Authors:||Zhao, Yunxing
Tang, Michael T.
|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.||URI:||https://hdl.handle.net/10356/142123||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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