Charge Storage Properties of Aqueous Halide Supercapatteries with Activated Carbon and Graphene Nanoplatelets as Active Electrode Materials

Akinwolemiwa, Bamidele; Wei, Chaohui; Yang, Qinghua; Chen, George Z.

Abstract

Device level performance of aqueous halide supercapatteries fabricated with equal electrode mass of activated carbon or graphene nanoplatelets has been characterized. It was revealed that the surface oxygen groups in the graphitic structures of the nanoplatelets contributed toward a more enhanced charge storage capacity in bromide containing redox electrolytes. Moreover, the rate performance of the devices could be linked to the effect of the pore size of the carbons on the dynamics of the inactive alkali metal counterion of the redox halide salt. Additionally, the charge storage performance of aqueous halide supercapatteries with graphene nanoplatelets as the electrode material may be attributed to the combined effect of the porous structure on the dynamics of the non-active cations and a possible interaction of the Br?/(Br2+Br3?) redox triple with the surface oxygen groups within the graphitic layer of the nanoplatelets. Generally, it has been shown that the surface groups and microstructure of electrode materials must be critically correlated with the redox electrolytes in the ongoing efforts to commercialize these devices.

• Journal Article Type: Article
• Acceptance Date: Sep 9, 2020
• Online Publication Date: Sep 17, 2020
• Publication Date: 2021-07
• Deposit Date: Sep 23, 2020
• Publicly Available Date: Sep 18, 2021
• Journal: Energy and Environmental Materials
• Print ISSN: 2575-0356
• Electronic ISSN: 2575-0356
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 4
• Issue: 3
• Pages: 481-491
• DOI: https://doi.org/10.1002/eem2.12133
• Public URL: https://nottingham-repository.worktribe.com/output/4921918
• Publisher URL: https://onlinelibrary.wiley.com/doi/10.1002/eem2.12133