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dc.contributor.authorChen, Wenxia
dc.contributor.authorWei, Wei
dc.contributor.authorWang, Kefeng
dc.contributor.authorCui, Jinhai
dc.contributor.authorZhu, Xingwang
dc.contributor.authorOstrikov, Kostya Ken
dc.date.accessioned2021-09-16T03:49:07Z
dc.date.available2021-09-16T03:49:07Z
dc.date.issued2021
dc.identifier.issn2040-3364
dc.identifier.doi10.1039/d1nr02966e
dc.identifier.urihttp://hdl.handle.net/10072/408055
dc.description.abstractElectrocatalytic water splitting is a promising energy-efficient solution to obtain clean hydrogen energy. Bifunctional electrocatalysts made up of cheap and abundant elements and suitable for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) are critically needed, yet their performance deserves substantial improvement. The catalytic activity could be improved by creating unsaturated defects, which so far has rarely been demonstrated. Here, we combine the effects of unsaturated sulfur vacancies and bi-elemental C and N doping in MoS2 nanosheets to achieve high-performance bifunctional electrocatalysts. The new method to obtain C and N doped MoS2 at high temperature is presented. The obtained C-N-MoS2/CC-T catalysts with S unsaturated defect sites and Mo-N links exhibit high activity and improved electrical conductivity for both the HER and OER in alkaline media. Systematic experiments and density functional theory (DFT) analysis confirm that CN-doping exposes catalytically active sites and enhances water adsorption. The optimized C-N-MoS2/CC-700 catalyst exhibits low overpotentials of 90 and 230 mV at 10 mA cm-2 for the HER and OER, respectively. Importantly, the porous C-N-MoS2/CC-700 nanosheets deliver low voltages of 1.58 V for the overall water splitting at 10 mA cm-2 and robust operation for 30 h without any reduced activity. Such impressive performances are attributed to their unique structure with large specific surface area, abundant S unsaturated sites, Mo-N links, and shortened electron transfer paths. This partial defect filling by the bi-dopant incorporation approach is generic and is promising for a broad range of advanced energy materials.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherRoyal Society of Chemistry
dc.relation.ispartofpagefrom14506
dc.relation.ispartofpageto14517
dc.relation.ispartofissue34
dc.relation.ispartofjournalNanoscale
dc.relation.ispartofvolume13
dc.subject.fieldofresearchPhysical sciences
dc.subject.fieldofresearchNanomedicine
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchOther engineering
dc.subject.fieldofresearchcode51
dc.subject.fieldofresearchcode320604
dc.subject.fieldofresearchcode34
dc.subject.fieldofresearchcode4099
dc.subject.keywordsScience & Technology
dc.subject.keywordsPhysical Sciences
dc.subject.keywordsChemistry, Multidisciplinary
dc.subject.keywordsNanoscience & Nanotechnology
dc.titlePartial sulfur vacancies created by carbon-nitrogen deposition of MoS2 for high-performance overall electrocatalytic water splitting
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationChen, W; Wei, W; Wang, K; Cui, J; Zhu, X; Ostrikov, KK, Partial sulfur vacancies created by carbon-nitrogen deposition of MoS2 for high-performance overall electrocatalytic water splitting, NANOSCALE, 2021, 13 (34), pp. 14506-14517
dc.date.updated2021-09-16T03:45:27Z
gro.hasfulltextNo Full Text
gro.griffith.authorOstrikov, Ken


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