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Capacitive and non-capacitive faradaic charge storage

Guan, Li; Yu, Linpo; Chen, George Z.

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Li Guan

Linpo Yu


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.

Journal Article Type Article
Acceptance Date Jan 29, 2016
Online Publication Date Feb 1, 2016
Publication Date Jul 10, 2016
Deposit Date Jun 6, 2016
Publicly Available Date Jun 6, 2016
Journal Electrochimica Acta
Print ISSN 0013-4686
Electronic ISSN 0013-4686
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 206
Pages 464-478
Keywords Capacitive charge storage; Faradaic process; Supercapacitor; Supercapattery; Unequal electrode capacitance
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