Unusual doping induced phase transitions in NiS via solventless synthesis enabling superior bifunctional electrocatalytic activity

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dc.contributor.authorRevaprasadu, Neerish
dc.contributor.authorShombe, Ginena Bildard
dc.contributor.authorKhan, Malik Dilshad
dc.contributor.authorAlenad, Asma M.
dc.contributor.authorChoi, Jonghyun
dc.contributor.authorIngsel, Tenzin
dc.contributor.authorGupta, Ram K.
dc.date.accessioned2025-11-24T12:00:30Z
dc.date.available2025-11-24T12:00:30Z
dc.date.issued2020
dc.departmentNameChemistry
dc.description.abstractTransition metal sulfides have been investigated as promising bifunctional materials for catalytic energy generation and energy storage applications. Although various strategies such as tuning the size, phase or defects and composition engineering have led to catalytic enhancement, there still remains the requirement for better performance for practical applications. In this study, we have used a potentially scalable solventless route for phase selective synthesis of α-NiS or β-NiS. Both phases were doped with different transition metals (Cu, Co and Fe) for enhanced catalytic performance. Interestingly, besides commonly observed thermal assisted phase transition, dopant (Co, Cu, and Fe) induced α- to β-phase transition or vice versa was also observed which has rarely been reported for NiS. The effect of dopants on the crystal structure and electrocatalytic activity has been investigated. The best supercapacitive behavior was observed for Co-doped α-NiS which showed a specific capacitance of 1586 F g−1 at a current density of 0.5 A g−1 and a high rate capability. On the other hand, Fe-doped α-NiS displayed the best electrocatalytic activity for both the OER (266 mV at 10 mA cm−2) and the HER (146 mV at 10 mA cm−2), with Tafel slopes of 79 and 113 mV dec−1 respectively. The Fe-doped α-NiS catalyst was also used as both the anode and cathode in an electrolyzer, in which an overpotential of about 410 mV at 10 mA cm−2 was observed. The prepared electrodes demonstrate outstanding stability and flexibility.
dc.facultyFaculty of Science, Agriculture and Engineering
dc.format.preprintNo
dc.identifier.citationShombe, G.B., Khan, M.D., Alenad, A.M., Choi, J., Ingsel, T., Gupta, R.K. and Revaprasadu, N., 2020. Unusual doping induced phase transitions in NiS via solventless synthesis enabling superior bifunctional electrocatalytic activity. Sustainable Energy and Fuels, 4(10), pp.5132-5143.
dc.identifier.issn2398-4902
dc.identifier.otherhttps://doi.org/10.1039/D0SE00855A
dc.identifier.urihttp://hdl.handle.net/10530/58375
dc.issuenumber4 / 10
dc.pages5132 - 5143
dc.peerreviewedYes
dc.publisherRoyal Society of Chemistry
dc.subjectOne-pot synthesis
dc.subjectHighly efficient
dc.subjectEnergy conversion
dc.subjectNanosheet arrays
dc.subjectHydrogen
dc.subjectElectrode
dc.subjectSulfide
dc.subjectElectrocatalytic activity
dc.titleUnusual doping induced phase transitions in NiS via solventless synthesis enabling superior bifunctional electrocatalytic activity
dc.title.journalSustainable Energy and Fuels
dc.typeJournal Article
dspace.entity.typePublication
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