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Atomic layered titanium sulfide quantum dots as electrocatalysts for enhanced hydrogen evolution reaction
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. Department of Materials Science and NanoEngineering, Rice University, Houston, TX, USA.
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2018 (Engelska)Ingår i: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 5, nr 1, artikel-id 1700895Artikel i tidskrift (Refereegranskat) 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)).

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2018. Vol. 5, nr 1, artikel-id 1700895
Nyckelord [en]
atomic layer, electrocatalysis, hydrogen evolution reaction, quantum dots, transition metal chalcogenides
Nationell ämneskategori
Materialkemi Fysikalisk kemi Den kondenserade materiens fysik
Identifikatorer
URN: urn:nbn:se:umu:diva-144396DOI: 10.1002/admi.201700895ISI: 000419675700010Scopus ID: 2-s2.0-85032265264OAI: oai:DiVA.org:umu-144396DiVA, id: diva2:1182426
Tillgänglig från: 2018-02-13 Skapad: 2018-02-13 Senast uppdaterad: 2023-03-24Bibliografiskt granskad

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Sharifi, Tiva

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