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Vanadium self-intercalated C/V 1.11 S 2 nanosheets with abundant active sites for enhanced electro-catalytic hydrogen evolution
Yang M.1; Cao L.1; Wang Z.2; Qu Y.1; Shang C.2; Guo H.2; Xiong W.2; Zhang J.2; Shi R.2; Zou J.2; Cheng C.2; Pan H.1; Lu Z.2
2019-03-20
Source PublicationElectrochimica Acta
ISSN00134686
Volume300Pages:208-216
Abstract

A novel and highly active vanadium self-intercalated C/V S nanosheets with abundant active sites are fabricated by a simple hydrothermal-calcinations method. The structures and morphology of C/V S nanosheets were characterized by XRD, SEM, XPS and TEM. Particularly, PVP (polyvinylpyrrolidone) was used as surfactant to control the morphology of vanadium sulfide and carbon source to reduce the vanadium sulfide into vanadium self-intercalated V S phase with rich active sites. The C/V S nanosheets showed an excellent electrocatalytic activity for hydrogen evolution reaction, including a low onset potential of 15 mV vs. RHE (reversible hydrogen electrode), small Tafel slope of 51 mV dec , as well as extraordinary catalytic stability. The first-principle calculations further confirmed that the V S has a much lower Gibbs free energy for hydrogen adsorption (ΔG ) than that of VS . The enhanced HER performance can be contributed to the unique vanadium self-intercalated structures, nanostructured morphology and rich sulfur defects of the obtained C/V S nanosheets. We believe that the C/V S can be used as electrocatalyst in chemical engineering industry and our method provides guidance on the fabrication of other defective transition-metal dichalcogenides to improve their catalytic performances.

KeywordC/v 1.11 s 2 Nanosheets Electrocatalysts Gibbs Free Energy For Hydrogen Adsorption Hydrogen Evolution Reaction Self-intercalated
DOI10.1016/j.electacta.2019.01.038
URLView the original
Indexed BySCI
Language英语
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000458488200026
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Citation statistics
Document TypeJournal article
CollectionInstitute of Applied Physics and Materials Engineering
Affiliation1.Universidade de Macau
2.Southern University of Science and Technology
Recommended Citation
GB/T 7714
Yang M.,Cao L.,Wang Z.,et al. Vanadium self-intercalated C/V 1.11 S 2 nanosheets with abundant active sites for enhanced electro-catalytic hydrogen evolution[J]. Electrochimica Acta,2019,300:208-216.
APA Yang M..,Cao L..,Wang Z..,Qu Y..,Shang C..,...&Lu Z..(2019).Vanadium self-intercalated C/V 1.11 S 2 nanosheets with abundant active sites for enhanced electro-catalytic hydrogen evolution.Electrochimica Acta,300,208-216.
MLA Yang M.,et al."Vanadium self-intercalated C/V 1.11 S 2 nanosheets with abundant active sites for enhanced electro-catalytic hydrogen evolution".Electrochimica Acta 300(2019):208-216.
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