Redox product-controlled capacitive behavior of dandelion-like VS4/carbon and V2O5/carbon via sulfide–oxide conversion and carbon integration

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Author list: Kuo, T.-R.; Lin, K.-R.; Kongvarhodom, C.; Saukani, M.; Yougbaré, S.; Chen, H.-M.; Lin, L.-Y.

Publication year: 2025

Volume number: 50

Start page: 103167

ISSN: 24685194

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-105020260920&doi=10.1016%2Fj.mtchem.2025.103167&partnerID=40&md5=8808634f882f29ac550fb1b395a3d54d

Languages: English-Great Britain (EN-GB)

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Abstract

Vanadium-based compounds with abundant oxidation states enable multi-electron redox reactions, which are favorable for charge storage in battery-type systems. Among these, VS4 and V2O5 have been widely studied but rarely compared under similar conditions. In this work, VS4/carbon and V2O5/carbon composites are synthesized via a hydrothermal method with an optional annealing step, enabling a direct comparison between sulfide and oxide systems. Carbon incorporation effectively enhances conductivity, structural stability, and surface accessibility. VS4/carbon forms a dandelion-like structure with radially aligned nanosheets, while V2O5/carbon shows more aggregated and twisted nanosheets. Compared with V2O5/carbon, the VS4/carbon electrode exhibits superior capacitive behavior due to its more accessible electroactive surface and porous structure. Electrochemical kinetics analysis further indicates that charge storage in VS4/carbon is mainly surface-controlled with efficient ion transport. These findings emphasize the structural and electrochemical advantages of sulfide-based materials and provide comparative insight into the design of vanadium-based electrodes for high-rate energy storage applications. © 2025 Elsevier Ltd

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