1,2-Bis-(diphenylphosphino)ethane (dppe) appended cobalt(iii)-dithiocarbamates as single source precursors of cobalt sulfide/cobalt phosphide composites: apt electrocatalytic materials for water splitting reactions

Devyani Srivastava, Aparna Kushwaha, None Sudheer, Gabriele Kociok-Köhn, Ashish Kumar Singh, Mohd Muddassir, Abhinav Kumar

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2 Citations (SciVal)

Abstract

New heteroleptic dppe appended Co(iii)-dithiocarbamate (dtc) complex cations with compositions [Co(S2CNEt2)2(dppe)](PF6) (Co-Et), [Co(S2CNPri2)2(dppe)](PF6) (Co-Pr) and [Co(S2CNBun2)2(dppe)](PF6) (Co-Bu) have been synthesized and characterized by microanalysis, spectroscopic methods and crystallographic analysis. The single crystal X-ray diffraction results indicated that in all three complexes, the coordination environment around Co(iii) is distorted octahedral and Co(iii) is coordinated to four sulfur centers of the two dtc ligands and the two phosphorus centers of the dppe ligand. These complexes serve as precursors to yield cobalt sulfide/cobalt phosphide nano-composites dCo-Et, dCo-Pr and dCo-Bu by solvothermal decomposition of Co-Et, Co-Pr and Co-Bu, respectively. The decomposed materials have been characterized by PXRD and SEM-EDAX and explored as potential electrocatalysts for both oxygen evolution and hydrogen evolution reactions in basic and acidic media, respectively. Catalytic activity is dependent on the precursor complex and best OER and HER activities are observed for dCo-Bu with an η10 of 230 mV and a Tafel slope of 192.11 mV dec−1 for the OER and an η10 of 470 mV and a Tafel slope of 126.21 mV dec−1 for the HER.

Original languageEnglish
Pages (from-to)9366-9375
Number of pages10
JournalNew Journal of Chemistry
Volume48
Issue number20
Early online date7 May 2024
DOIs
Publication statusPublished - 7 May 2024

Funding

AK is grateful to the Center of Excellence, Uttar Pradesh Government for sanctioning the project number 70/2021/1543/sattar-4-2022/001-70-4099-7-2022. Dr Mohd. Muddassir is grateful to the Researchers Supporting Project number (RSP2024R141), King Saud University, Riyadh, Saudi Arabia, for financial assistance.

FundersFunder number
Center of Excellence
King Saud University
Uttar Pradesh GovernmentRSP2024R141, 70/2021/1543/sattar-4-2022/001-70-4099-7-2022

    ASJC Scopus subject areas

    • Catalysis
    • General Chemistry
    • Materials Chemistry

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