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Highly Improved Electrocatalytic Activity of NiSx: Effects of Cr-doping and Phase Transition
Liu, D; Tong, R; Qu, Y; Zhu, Q; Zhong, XW; Fang, ML; Lo, K. H.; Zhang, F; Ye, YC; Tang, Y.; Chen, S.; Xing, G.; Pan, H.
2020-06-15
Source PublicationApplied Catalysis B: Environmental
ISSN0926-3373
Volume267Pages:118721
Abstract

Hydrogen evolution reaction (HER) is a vital step for electrochemical energy conversion technologies. However, developing cost-efficient electrocatalysts remains a huge challenge. Here, we report that Cr-doped NiSx (Cr-NiSx) in situ grown on Ni foam via a hydrothermal sulfurization reaction can be an ultra-highly efficient and low-cost electrocatalyst for HER in alkaline condition. We find that the Cr-doping can trigger the formation of NiS and NiS1.19, leading to the suppression of Ni3S2 in the nanostructure. We show that Cr-NiSx exhibits an excellent HER activity with an ultralow overpotential of 81 mV at 10 mA cm−2, better than those of most nickel sulfide catalysts, and good stability. Our combined experimental and computational study reveals that the excellent performance is contributed by: (1) stabilized NiSx phase, (2) strongly improved conductivity, (3) greatly enhanced active sites, and (4) reduced Gibbs free energy for hydrogen adsorption (ΔGH) due to the Cr-doping. We believe that this work provides a simple approach to design cost-effective and ultra-highly efficient HER electrocatalysts for practical applications.

KeywordElectrocatalytic Activity Nisx Cr-doping Phase Transition
DOIhttps://doi.org/10.1016/j.apcatb.2020.118721
Indexed BySCIE
Language英語English
WOS Research AreaChemistry ; Engineering
WOS SubjectChemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
WOS IDWOS:000518865300033
The Source to ArticlePB_Publication
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Cited Times [WOS]:40   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF PHYSICS AND CHEMISTRY
DEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Corresponding AuthorChen, S.; Xing, G.; Pan, H.
Recommended Citation
GB/T 7714
Liu, D,Tong, R,Qu, Y,et al. Highly Improved Electrocatalytic Activity of NiSx: Effects of Cr-doping and Phase Transition[J]. Applied Catalysis B: Environmental,2020,267:118721.
APA Liu, D,Tong, R,Qu, Y,Zhu, Q,Zhong, XW,Fang, ML,Lo, K. H.,Zhang, F,Ye, YC,Tang, Y.,Chen, S.,Xing, G.,&Pan, H..(2020).Highly Improved Electrocatalytic Activity of NiSx: Effects of Cr-doping and Phase Transition.Applied Catalysis B: Environmental,267,118721.
MLA Liu, D,et al."Highly Improved Electrocatalytic Activity of NiSx: Effects of Cr-doping and Phase Transition".Applied Catalysis B: Environmental 267(2020):118721.
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