Low temperature scalable synthetic approach enabling high bifunctional electrocatalytic performance of NiCo 2 S 4 and CuCo 2 S 4 thiospinels

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dc.contributor.authorShombe, Ginena Bildard
dc.contributor.authorRazzaque, Shumaila
dc.contributor.authorKhan, Malik Dilshad
dc.contributor.authorNyokong, Tebello
dc.contributor.authorMashazi, Philani
dc.contributor.authorChoi, Jonghyun
dc.contributor.authorBhoyate, Sanket
dc.contributor.authorGupta, Ram K.
dc.contributor.authorRevaprasadu, Neerish
dc.contributor.organizationDepartment of Chemistry, University of Zululand, South Africaen
dc.contributor.organizationChemistry Department, University of Dar es Salaam, Tanzaniaen
dc.contributor.organizationKey Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Chinaen
dc.contributor.organizationInstitute of Physical Chemistry, Polish Academy of Sciencesen
dc.contributor.organizationInstitute for Nanotechnology Innovation, Rhodes University, South Africaen
dc.contributor.organizationDepartment of Chemistry, Rhodes University, South Africaen
dc.contributor.organizationDepartment of Chemistry, Pittsburg State University, USAen
dc.date.accessioned2021-12-19T10:01:33Z
dc.date.available2021-12-19T10:01:33Z
dc.date.issued2021-09-24
dc.description.abstractTernary metal sulfides are currently in the spotlight as promising electroactive materials for high-performance energy storage and/or conversion technologies. Extensive research on metal sulfides has indicated that, amongst other factors, the electrochemical properties of the materials are strongly influenced by the synthetic protocol employed. Herein, we report the electrochemical performance of uncapped NiCo2S4 and CuCo2S4 ternary systems prepared via solventless thermolysis of the respective metal ethyl xanthate precursors at 200 and 300 °C. The structural, morphological and compositional properties of the synthesized nanoparticles were examined by powder X-ray diffraction (p-XRD), transmission electron microscopy (TEM), high-resolution TEM, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX) techniques. Electrochemical studies indicate that NiCo2S4 nanoparticles synthesized at 300 °C exhibit superior energy storage characteristics with a high specific capacitance of ca. 2650 F g−1 at 1 mV s−1, as compared to CuCo2S4 nanoparticles, which showcased a specific capacitance of ca. 1700 F g−1 at the same scan rate. At a current density of 0.5 A g−1, NiCo2S4 and CuCo2S4 nanoparticles displayed specific capacitances of 1201 and 475 F g−1, respectively. In contrast, CuCo2S4 nanoparticles presented a higher electrocatalytic activity with low overpotentials of 269 mV for oxygen evolution reaction (OER), and 224 mV for the hydrogen evolution reaction (HER), at 10 mA cm−2. The stability of the catalysts was examined for 2000 cycles in which a negligible change in both OER and HER activities was observed.en
dc.description.sponsorshipEuropean Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 847413 for funding. Scientific work published as part of an international co-financed project founded from the programme of the Minister of Science and Higher Education entitled “PMW” in the years 2020 - 2024; agreement no. 5005/H2020-MSCA-COFUND/2019/2.
dc.identifier.citationRSC Adv., 2021,11, 31533-31546en
dc.identifier.doi10.1039/D1RA02309H
dc.identifier.urihttps://pubs.rsc.org/en/content/articlelanding/2021/RA/D1RA02309H
dc.identifier.urihttps://depot.ceon.pl/handle/123456789/20819
dc.language.isoen
dc.publisherRoyal Society of Chemistryen
dc.rightsUznanie autorstwa 3.0 Polska*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/pl/*
dc.subjectmetal sulfidesen
dc.subjectelectrocatalystsen
dc.titleLow temperature scalable synthetic approach enabling high bifunctional electrocatalytic performance of NiCo 2 S 4 and CuCo 2 S 4 thiospinelsen
dc.typearticleen
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