Interfacial Engineering of Sulfurized Cobalt/Nickel Glycerates Synthesized from Tetrafluoroborate-Based Precursors for High-Performance Hybrid Energy Storage
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Author list: Kuo, T.-R.; Wang, Y.-H.; Chen, G.-L.; Chuang, B.-Y.; Kongvarhodom, C.; Yougbaré, S.; Saukani, M.; Chen, H.-M.; Lin, L.-Y.
Publisher: American Chemical Society
Publication year: 2025
Volume number: 8
Issue number: 22
Start page: 17043
End page: 17053
Number of pages: 11
ISSN: 25740962
eISSN: 2574-0962
Languages: English-Great Britain (EN-GB)
Abstract
Metal glycerates have recently attracted increasing attention as promising electrode precursors for energy storage devices, owing to their inherently porous structures, large specific surface areas, and abundant redox-active sites. However, systematic investigations comparing different metal systems synthesized under identical conditions remain scarce. Here, cobalt and nickel glycerates were synthesized using novel fluorine-rich metal precursors, Co(BF4)2and Ni(BF4)2, to elucidate the influence of metal species and BF4–anions on their redox behavior and charge-storage performance. The presence of BF4–anions facilitates in situ fluorine incorporation, which promotes the formation of metal fluoride intermediates and/or expanded interlayer spacings, thereby enhancing structural stability and electrochemical activity. Subsequent sulfurization further transforms the materials into conductive metal sulfides, significantly improving charge-transfer efficiency and reaction kinetics. The optimized sulfurized Ni glycerate (S–Ni-Gly) electrode delivers a remarkably high specific capacitance of 1318.4 F/g at 10 mV/s and retains 97.4% of its capacitance with 92.0% Coulombic efficiency after 10,000 cycles. When assembled into a battery–supercapacitor hybrid, the S–Ni-Gly device achieves a maximum energy density of 15.5 Wh/kg at 650 W/kg. This work provides insights into the roles of BF4–-based precursors and comparative metal–anion chemistry in designing glycerate-derived hybrid electrodes for high-performance energy storage applications. © 2025 The Authors. Published by American Chemical Society
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