Novel design of NiS2 and V3Ni(SO4)4 · 24H2O composites with controllable synthetic temperature and duration as an efficient active material for battery supercapacitor hybrids
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Author list: Kuo T.-R.; Huang W.-L.; Kongvarhodom C.; Saukani M.; Yougbaré S.; Chen H.-M.; Lin L.-Y.
Publisher: Elsevier
Publication year: 2025
Volume number: 130
ISSN: 2352-152X
eISSN: 2352-1538
Languages: English-Great Britain (EN-GB)
Abstract
Nickel–vanadium (Ni[sbnd]V) composites are considered as promising active materials for battery supercapacitor hybrids (BSHs), owing to multiple oxidation states, high theoretical capacitance, and tunable redox activity. Structural optimization and sulfur incorporation are effective strategies to improve conductivity and structural stability. Hydrothermal parameters such as temperature and duration significantly influence the material and electrochemical properties. In this study, novel Ni[sbnd]V composites are synthesized via a hydrothermal process at different temperatures and durations as the active material of BSHs. The Ni[sbnd]V composites primarily consist of NiS2 and V3Ni(SO4)4 · 24H2O. The Ni[sbnd]V composites synthesized using 150 °C and 10 h (Ni-V150@10) shows the largest specific capacitance (CF) of 1381.3 F/g (621.6 C/g) at 20 mV/s, owing to its favorable twisted layered structure and abundant electroactive NiS2. A BSH constructed with Ni-V150@10 and reduced graphene oxide electrodes shows a maximum energy density of 9.6 Wh/kg at the power density of 857 W/kg. The capacitance retention of 96.6% and a Coulombic efficiency of 96.9% are also attained after 10,000 charge/discharge cycles. This study provides a clear approach for designing high-performance active materials with controllable hydrothermal temperature and duration, which can be extended to improve the electrochemical performance of other bimetallic composites in the future. © 2025 Elsevier Ltd
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