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Stabilizing Active Edge Sites in Semicrystalline Molybdenum Sulfide by Anchorage on Nitrogen-Doped Carbon Nanotubes for Hydrogen Evolution Reaction
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2016 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 26, no 37, 6766-6776 p.Article in journal (Refereed) Published
Abstract [en]

Finding an abundant and cost-effective electrocatalyst for the hydrogen evolu-tion reaction (HER) is crucial for a global production of hydrogen from water electrolysis. This work reports an exceptionally large surface area hybrid catalyst electrode comprising semicrystalline molybdenum sulfi de (MoS 2+ x) catalystattached on a substrate based on nitrogen-doped carbon nanotubes (N-CNTs), which are directly grown on carbon fiber paper (CP). It is shown here that nitrogen-doping of the carbon nanotubes improves the anchoring of MoS 2+ xcatalyst compared to undoped carbon nanotubes and concurrently stabilizes a semicrystalline structure of MoS 2+ x with a high exposure of active sites for HER. The well-connected constituents of the hybrid catalyst are shown to facilitate electron transport and as a result of the good attributes, the MoS 2+ x/N-CNT/CPelectrode exhibits an onset potential of −135 mV for HER in 0.5 M H2SO4, a Tafel slope of 36 mV dec −1, and high stability at a current density of −10 mA cm −2.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2016. Vol. 26, no 37, 6766-6776 p.
Keyword [en]
carbon paper, hydrogen evolution reaction, molybdenum disulfide—MoS2, nitrogen doped carbon nanotubes, water splitting catalysts
National Category
Inorganic Chemistry Other Chemical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-128753DOI: 10.1002/adfm.201601994ISI: 000384810300006OAI: oai:DiVA.org:umu-128753DiVA: diva2:1056159
Available from: 2016-12-14 Created: 2016-12-14 Last updated: 2017-01-04Bibliographically approved

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Ekspong, JoakimSharifi, TivaShchukarev, AndreyKlechikov, AlexeyWågberg, ThomasGracia-Espino, Eduardo
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