ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

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Moiseeva T. A., Safonova A. G., Myasoedova T. N. Study of composites based on cobalt and nickel sulfides with nitrogen-doped carbon obtained from sorghum biomass for supercapacitor electrodes. Electrochemical Energetics, 2026, vol. 26, iss. 2, pp. 75-90. DOI: 10.18500/1608-4039-2026-26-2-75-90, EDN: NURVXR

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
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Language: 
Russian
Heading: 
Supercapacitors
Article type: 
Article
UDC: 
546.05+544.6+544.2
DOI: 
10.18500/1608-4039-2026-26-2-75-90
EDN: 
NURVXR

Study of composites based on cobalt and nickel sulfides with nitrogen-doped carbon obtained from sorghum biomass for supercapacitor electrodes

Autors: 
Moiseeva Tatiana A., Southern Federal University, Institute of Nanotechnology, Electronics and Instrumentation
Safonova Anna G., Southern Federal University, Institute of Nanotechnology, Electronics and Instrumentation
Myasoedova Tatiana N., Southern Federal University, Institute of Nanotechnology, Electronics and Instrumentation
Abstract: 

Nitrogen-doped carbon was derived from sorghum press cake following hydrothermal treatment. (SBET being 2668 m2 /g). Hydrothermal synthesis with thiourea was used to prepare NC_CoS and NC_NiS composites. SEM, N_2 adsorption and Raman spectroscopy revealed that Co forms a crystalline sulfide phase which is spread uniformly on the carbon network, whereas Ni yields an amorphous or highly dispersed sulfide. Electrochemical tests in 1 M of KOH showed that NC_CoS has a specific capacitance of 115 F/g at 1.3 A/g and retains 72% after 3500 cycles. In contrast, NC_NiS exhibits only 38 F/g, similar to the initial carbon, due to the poor pseudocapacitive activity of the amorphous Ni–containing phase..

Key words: 
sorghum press cake
metal sulfides
electrode material
electrochemical properties
Acknowledgments: 
This work was supported by the Russian Science Foundation, project No. 25-23-00514 “Promising Supercapacitor Electrodes Based on Carbon Doped with Nitrogen and Transition Metal Sulfides” (https://rscf.ru/project/25-23-00514/) at Southern Federal University
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Received: 
21.04.2026
Accepted: 
21.05.2026
Published: 
30.06.2026