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. 2020 Mar 3;25(5):1136. doi: 10.3390/molecules25051136

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Optical (left side; scale bar: 2 mm) and scanning electron microscopy (SEM) images (right side; scale bar: 20 mm) of monolayer MoS₂ film before (P–MoS₂, upper panel) and after (V–MoS₂, lower panel) desulfurization. (b) X-ray photoelectron spectroscopy (XPS) Mo 3d and (c) S 2p spectra of P–MoS₂ and V–MoS₂. (d) LSV curves of monolayer MoS₂ before and after desulfurization. (e) Turnover frequency (TOF) per surface Mo atom (TOF_Mo) as a function of applied potential for P–MoS₂ and V–MoS₂. (f) Free energy diagram for the HER on S-vacancy sites with different vacancy concentrations. Reproduced with permission from Ref. 17. Copyright © 2017, Nature Publishing Group.