Glycerol-assisted synthesis of CoSO4 from Co(BF4)2 through a fluorinated precursor route toward high-performance hybrid energy storage
Journal article
Authors/Editors
Strategic Research Themes
Publication Details
Author list: Kuo, T.-R.; Chen, G.-L.; Chuang, B.-Y.; Kongvarhodom, C.; Yougbaré, S.; Saukani, M.; Chen, H.-M.; Lin, L.-Y.
Publisher: Elsevier
Publication year: 2026
Volume number: 141
Start page: 119370
ISSN: 2352-152X
eISSN: 2352-1538
Languages: English-Great Britain (EN-GB)
Abstract
Cobalt glycerate (Co-G) has emerged as a promising precursor material for battery–supercapacitor hybrids (BSHs), owing to its porous architecture, large surface area, and redox-active cobalt sites. The choice of cobalt precursor significantly affects the resultant phase composition and structural evolution. In this study, cobalt tetrafluoroborate (Co(BF4)2) is adopted as a fluorine-rich cobalt source to promote the in-situ formation of cobalt fluoride (CoF2) during glycerol-mediated synthesis. Varying glycerol volumes enables control over particle morphology and crystallization behavior, influencing ion diffusion and electrochemical response. Post treatments are further applied to tune material properties, including thermal calcination in air that improves the crystallinity and phase purity of CoF2 (Co-G4-O) and solvothermal sulfurization that transforms the precursor into CoSO4 (Co-G4-S). The Co-G4-S electrode achieves a superior specific capacitance (CF) of 1180.4 F/g at 10 mV/s, compared to those of Co-G4-O (423.4 F/g) and untreated Co-G (344.8 F/g). A BSH with a Co-G4-S positive electrode delivers a maximum energy density of 15.7 Wh/kg at 600 W/kg, and maintains 85.6% of its initial capacitance and Coulombic efficiency of 90.4% after 10,000 cycles. These results underscore the importance of precursor selection, glycerol-mediated synthesis control, and post-treatment modification in optimizing cobalt-based materials for high-performance hybrid energy storage. © 2025
Keywords
No matching items found.
Contact Information