Highly active single-layer MoS2 catalysts synthesized by swift heavy ion irradiation

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Madauss , L , Zegkinoglou , I , Muinos , H V , Choi , Y-W , Kunze , S , Zhao , M-Q , Naylor , C H , Ernst , P , Pollmann , E , Ochedowski , O , Lebius , H , Benyagoub , A , Ban-d'Etat , B , Johnson , A T C , Djurabekova , F , Cuenya , B R & Schleberger , M 2018 , ' Highly active single-layer MoS2 catalysts synthesized by swift heavy ion irradiation ' , Nanoscale , vol. 10 , no. 48 , pp. 22908-22916 . https://doi.org/10.1039/c8nr04696d

Title: Highly active single-layer MoS2 catalysts synthesized by swift heavy ion irradiation
Author: Madauss, Lukas; Zegkinoglou, Ioannis; Muinos, Henrique Vazquez; Choi, Yong-Wook; Kunze, Sebastian; Zhao, Meng-Qiang; Naylor, Carl H.; Ernst, Philipp; Pollmann, Erik; Ochedowski, Oliver; Lebius, Henning; Benyagoub, Abdenacer; Ban-d'Etat, Brigitte; Johnson, A. T. Charlie; Djurabekova, Flyura; Cuenya, Beatriz Roldan; Schleberger, Marika
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-12-28
Language: eng
Number of pages: 9
Belongs to series: Nanoscale
ISSN: 2040-3364
URI: http://hdl.handle.net/10138/285172
Abstract: Two-dimensional molybdenum-disulfide (MoS2) catalysts can achieve high catalytic activity for the hydrogen evolution reaction upon appropriate modification of their surface. The intrinsic inertness of the compound's basal planes can be overcome by either increasing the number of catalytically active edge sites or by enhancing the activity of the basal planes via a controlled creation of sulfur vacancies. Here, we report a novel method of activating the MoS2 surface using swift heavy ion irradiation. The creation of nanometer-scale structures by an ion beam, in combination with the partial sulfur depletion of the basal planes, leads to a large increase of the number of low-coordinated Mo atoms, which can form bonds with adsorbing species. This results in a decreased onset potential for hydrogen evolution, as well as in a significant enhancement of the electrochemical current density by over 160% as compared to an identical but non-irradiated MoS2 surface.
Subject: HYDROGEN EVOLUTION
MOLYBDENUM-DISULFIDE
SULFUR VACANCIES
GRAPHENE
EFFICIENT
MECHANISM
SITES
114 Physical sciences
116 Chemical sciences
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