Direct solvent free synthesis of bare α-NiS, β-NiS and α-β-NiS composite as excellent electrocatalysts: effect of self-capping on supercapacitance and overall water splitting activity

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dc.contributor.authorRevaprasadu, Neerish
dc.contributor.authorShombe, Ginena Bildard
dc.contributor.authorKhan, Malik Dilshad
dc.contributor.authorZequine, Camila
dc.contributor.authorZhao, Chen
dc.contributor.authorGupta, Ram K.
dc.coverage.conferenceissn
dc.date.accessioned2025-11-27T10:28:33Z
dc.date.available2025-11-27T10:28:33Z
dc.date.issued2020
dc.departmentNameChemistry
dc.description.abstractNickel sulfide is regarded as a material with tremendous potential for energy storage and conversion applications. However, it exists in a variety of stable compositions and obtaining a pure phase is a challenge. This study demonstrates a potentially scalable, solvent free and phase selective synthesis of uncapped α-NiS, β-NiS and α-β-NiS composites using nickel alkyl (ethyl, octyl) xanthate precursors. Phase transformation and morphology were observed by powder-X-ray diffraction (p-XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The comparative efficiency of the synthesized samples was investigated for energy storage and generation applications, in which superior performance was observed for the NiS synthesized from the short chain xanthate complex. A high specific capacitance of 1,940F/g, 2,150F/g and 2,250F/g was observed at 2mV/s for bare α-NiS, β-NiS and α-β-NiS composite respectively. At high current density of 1A/g, α-NiS showed the highest capacitance of 1,287F/g, with 100% of Coulombic efficiency and 79% of capacitance retention. In the case of the oxygen evolution reaction (OER), β-NiS showed an overpotential of 139mV at a current density of 10mA/cm2, with a Tafel slope of only 32mV/dec, showing a fast and efficient process. It was observed that the increase in carbon chain of the synthesized self-capped nickel sulfide nanoparticles decreased the overall efficiency, both for energy storage and energy generation applications.
dc.facultyFaculty of Science, Agriculture and Engineering
dc.format.preprintNo
dc.identifier.citationShombe, G.B., Khan, M.D., Zequine, C., Zhao, C., Gupta, R.K. and Revaprasadu, N., 2020. Direct solvent free synthesis of bare α-NiS, β-NiS and α-β-NiS composite as excellent electrocatalysts: effect of self-capping on supercapacitance and overall water splitting activity. Scientific reports, 10(1), pp.3260.
dc.identifier.issn2045-2322 (online)
dc.identifier.otherhttps://doi.org/10.1038/s41598-020-59714-9
dc.identifier.urihttp://hdl.handle.net/10530/58447
dc.inproceedingsissn
dc.issuenumber10 / 1
dc.keynoteissn
dc.peerreviewedYes
dc.publisherNature Publishing Group
dc.titleDirect solvent free synthesis of bare α-NiS, β-NiS and α-β-NiS composite as excellent electrocatalysts: effect of self-capping on supercapacitance and overall water splitting activity
dc.title.journalScientific Reports
dc.typeJournal Article
dspace.entity.typePublication
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