Unlocking high-performance supercapacitor behavior and sustained chemical stability of 2D metallic CrSe2 by optimal electrolyte selection

Li, W., Wolff, N., Samuel, A. K., Wang, Y., Georgiev, V. P. , Kienle, L. and Ganin, A. (2023) Unlocking high-performance supercapacitor behavior and sustained chemical stability of 2D metallic CrSe2 by optimal electrolyte selection. ChemElectroChem, 10(21), e202300428. (doi: 10.1002/celc.202300428)

Abstract

Supercapacitors are energy storage devices with the ability to rapidly charge and discharge, making them a valuable complement to battery systems. To maximize their fast-charging capabilities, identifying materials and methods to enhance their energy density is crucial. In this work, we carried out a comprehensive study of an emerging 2D dichalcogenide, CrSe2, as a supercapacitor material. We demonstrate that CrSe2 can be obtained at ambient temperature through deintercalation of a relevant KCrSe2 precursor using a 0.5 M solution of I2 in acetonitrile. Although CrSe2 decomposed in 1 M KOH, it was found to be chemically stable in common electrolytes such as H2SO4, Li2SO4, and Na2SO4. Despite low surface area CrSe2 reached a specific capacitance of 27 F g−1 in 1 M H2SO4 and, thus consistently outperformed high surface carbon black. Computational studies suggested that the metallic conductivity of CrSe2 was likely the primary factor contributing to the superior performance of this 2D chalcogenide over high surface carbon analogues.

• Item Type: Articles
• Additional Information: A.Y.G. and A.K.S. acknowledge the EPSRC (EP/W03333X/1) for supporting this work. N.W. and L.K. acknowledge the financial support by German Research Foundation (DFG) under the scheme of the collaborative research centre (CRC)1261/286471992. W.L. thanks China Scholarship Council for providing him with the scholarship.
• Keywords: supercapacitors, 2D materials, chromium, solid-state reactions, electric double-layer capacitance
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ganin, Dr Alexey and Li, Weihao and Georgiev, Professor Vihar and Wang, Mr Yuanshen and Samuel, Dr Arun Kumar
• Authors: Li, W., Wolff, N., Samuel, A. K., Wang, Y., Georgiev, V. P., Kienle, L., and Ganin, A.
• College/School: College of Science and Engineering > School of Chemistry; College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: ChemElectroChem
• Publisher: Wiley
• ISSN: 2196-0216
• ISSN (Online): 2196-0216
• Published Online: 29 September 2023
• Copyright Holders: Copyright: © 2023 The Authors
• First Published: First published in ChemElectroChem 10(21): e202300428
• Publisher Policy: Reproduced under a Creative Commons licence

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
316587		Supported MoTe2: proving the viability of atomically thin 2D material in hydrogen production at scale	Alexey Ganin	Engineering and Physical Sciences Research Council (EPSRC)	EP/W03333X/1	Chemistry