Capacitive and non-capacitive faradaic charge storage

Guan, Li and Yu, Linpo and Chen, George Z. (2016) Capacitive and non-capacitive faradaic charge storage. Electrochimica Acta, 206 . pp. 464-478. ISSN 0013-4686

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Abstract

This article aims to offer a critical overview of selected literature on capacitive and non-capacitive faradaic charge storage. It is particularly relevant to the concept of pseudocapacitance that is generally described as a result of fast surface faradaic processes. In general, faradaic processes represent electron transfer reactions at the interface between an electrode and its contacting solid or liquid electrolyte phase that is able to accept or donate electrons. Obviously, not all faradaic processes can be associated with pseudocapacitance. The question is how to differentiate pseudocapacitance related faradaic charge storage from the others. Therefore, attempts have been made to apply the band model for semiconductors to account qualitatively for the origin of pseudocapacitance. Capacitive and non-capacitive faradaic processes are then proposed to define and differentiate different charge storage mechanisms in supercapacitor and battery. On the other hand, the unequal electrode capacitance approach and the use of Ca2+ in aqueous electrolytes are discussed in relation with enhanced energy capacity of supercapacitors. In addition, the principle of supercapattery as a hybrid device is explained with recent literature examples.

Item Type: Article
Keywords: Capacitive charge storage; Faradaic process; Supercapacitor; Supercapattery; Unequal electrode capacitance
Schools/Departments: University of Nottingham, Ningbo Campus > Faculty of Science and Engineering > Division of Engineering
University of Nottingham UK Campus > Faculty of Engineering > Department of Chemical and Environmental Engineering
Identification Number: https://doi.org/10.1016/j.electacta.2016.01.213
Depositing User: Eprints, Support
Date Deposited: 06 Jun 2016 12:04
Last Modified: 13 Sep 2016 23:09
URI: http://eprints.nottingham.ac.uk/id/eprint/33650

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