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Synergistically creating sulfur vacancies in semimetal-supported amorphous MoS2 for efficient hydrogen evolution
Max Planck Inst Chem Phys Solids, Germany.
Max Planck Inst Chem Phys Solids, Germany.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
Univ Maryland, MD 20742 USA.
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2019 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 254Article in journal (Refereed) Published
Abstract [en]

The presence of elemental vacancies in materials are inevitable according to statistical thermodynamics, which will decide the chemical and physical properties of the investigated system. However, the controlled manipulation of vacancies for specific applications is a challenge. Here we report a facile method for creating large concentrations of S vacancies in the inert basal plane of MoS2 supported on semimetal CoMoP2. With a small applied potential, S atoms can be removed in the form of H2S due to the optimized free energy of formation. The existence of vacancies favors electron injection from the electrode to the active site by decreasing the contact resistance. As a consequence, the catalytic current is increased by 221% with the vacancy-rich MoS2 as electrocatalyst for hydrogen evolution reaction (HER). A small overpotential of 75 mV is needed to deliver a current density of 10 mA cm(-2), which is considered among the best values achieved for MoS2. It is envisaged that this work may provide a new strategy for utilizing the semimetal phase for structuring MoS2 into a multi-functional material.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 254
Keywords [en]
MoS2; Sulfur vacancies; Electrocatalyst; Semimetal
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-158909DOI: 10.1016/j.apcatb.2019.04.080ISI: 000472697500001Scopus ID: 2-s2.0-85065083340OAI: oai:DiVA.org:liu-158909DiVA, id: diva2:1338214
Note

Funding Agencies|European Research Council (ERC Advanced Grant) [291472]; ERC Advanced Grant [742068]; Natural Science Foundation of Shandong Province (CN) [ZR2016AB12]

Available from: 2019-07-20 Created: 2019-07-20 Last updated: 2019-08-22Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • Other style
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