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Atomic layered titanium sulfide quantum dots as electrocatalysts for enhanced hydrogen evolution reaction
Umeå University, Faculty of Science and Technology, Department of Physics. Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA.
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2018 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 5, no 1, article id 1700895Article in journal (Refereed) Published
Abstract [en]

The overall electrocatalytic activity toward hydrogen evolution reaction for layered transition metal dichalcogenides is governed by their intrinsic activity, the corresponding density of active sites, and the electron transfer resistance. Here, nanoengineering strategies to scale down both the lateral size and thickness of layered 1T-TiS2 powder to quantum dots (QDs) by bath sonication and probing sonication incision are employed. Uniform lateral size of 3-6 nm in the resulting QDs enhances the density of edge sites while the atomic layer thickness (1-2 nm) facilitates the electron transfer from the substrate to the edge sites. The obtained TiS2 QDs exhibit superior hydrogen evolution reaction activity over TiS2 nanosheets and MoS2 QDs prepared by the same method. The turnover frequency of TiS2 QDs with a small loading of 0.7 ng cm(-2) in an optimal deposition on electrode reached approximate to 2.0 s(-1) at an overpotential of -0.2 V versus RHE, several orders of magnitude higher than TiS2 nanosheets (0.01 s(-1)) and MoS2 QDs (0.07 s(-1)).

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 5, no 1, article id 1700895
Keywords [en]
atomic layer, electrocatalysis, hydrogen evolution reaction, quantum dots, transition metal chalcogenides
National Category
Materials Chemistry Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-144396DOI: 10.1002/admi.201700895ISI: 000419675700010OAI: oai:DiVA.org:umu-144396DiVA, id: diva2:1182426
Available from: 2018-02-13 Created: 2018-02-13 Last updated: 2018-06-09Bibliographically approved

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Sharifi, Tiva

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CiteExportLink to record
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  • apa
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