Unveiling the Interfacial Effects for Enhanced Hydrogen Evolution Reaction on MoS2/WTe2 Hybrid StructuresDepartment of Mechanical Engineering and Materials Science, Yale University, New Haven, CT, USA Energy Sciences Institute, Yale West Campus, West Haven, CT, USA.
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA.
Energy Sciences Institute, Yale West Campus, West Haven, CT, USA Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA.
Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an, P. R. China.
Department of Chemistry, Yale University, New Haven, CT, USA.
Department of Chemistry, Tsinghua University, Beijing, P. R. China.
Department of Chemistry, Brookhaven National Laboratory, Upton, NY, USA.
Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Energy Sciences Institute, Yale West Campus, West Haven, CT, USA Department of Chemistry, Yale University, New Haven, CT, USA.
Energy Sciences Institute, Yale West Campus, West Haven, CT, USA Department of Chemistry, Yale University, New Haven, CT, USA.
Department of Chemistry, Tsinghua University, Beijing, P. R. China.
Energy Sciences Institute, Yale West Campus, West Haven, CT, USA Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA.
Energy Sciences Institute, Yale West Campus, West Haven, CT, USA Department of Chemistry, Yale University, New Haven, CT, USA.
Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
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2019 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 15, no 19, article id 1900078Article in journal (Refereed) Published
Abstract [en]
Abstract Using the MoS2-WTe2 heterostructure as a model system combined with electrochemical microreactors and density function theory calculations, it is shown that heterostructured contacts enhance the hydrogen evolution reaction (HER) activity of monolayer MoS2. Two possible mechanisms are suggested to explain this enhancement: efficient charge injection through large-area heterojunctions between MoS2 and WTe2 and effective screening of mirror charges due to the semimetallic nature of WTe2. The dielectric screening effect is proven minor, probed by measuring the HER activity of monolayer MoS2 on various support substrates with dielectric constants ranging from 4 to 300. Thus, the enhanced HER is attributed to the increased charge injection into MoS2 through large-area heterojunctions. Based on this understanding, a MoS2/WTe2 hybrid catalyst is fabricated with an HER overpotential of â140 mV at 10 mA cmâ2, a Tafel slope of 40 mV decâ1, and long stability. These results demonstrate the importance of interfacial design in transition metal dichalcogenide HER catalysts. The microreactor platform presents an unambiguous approach to probe interfacial effects in various electrocatalytic reactions.
Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2019. Vol. 15, no 19, article id 1900078
Keywords [en]
electrochemical microreactors, heterostructures, hydrogen evolution reaction, interfacial effects, MoS2/WTe2 hybrid
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:liu:diva-189707DOI: 10.1002/smll.201900078ISI: 000472198100006Scopus ID: 2-s2.0-85063985435OAI: oai:DiVA.org:liu-189707DiVA, id: diva2:1708348
2022-11-032022-11-032022-11-24Bibliographically approved