Mechanisms and designs of asymmetrical electrochemical capacitors

Akinwolemiwa, Bamidele and Wei, Chaohui and Chen, George Z. (2017) Mechanisms and designs of asymmetrical electrochemical capacitors. Electrochimica Acta . ISSN 0013-4686 (In Press)

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Abstract

Different charge storage mechanisms in electrochemical energy storage devices are reviewed, including non-Faradaic capacitive, Faradaic capacitive, Faradaic non-capacitive, and their combinations. Specifically, Faradaic capacitive (pseudocapacitive) storage and Faradaic non-capacitive (Nernstian) storage are attributed to the transfer of delocalised and localised valence electrons, respectively. Mathematical and graphical expressions of the respective storage performances are presented. The account is made especially for asymmetrical electrochemical capacitors (AECs), supercapattery and supercabattery. Both hypothetical and experimental examples are presented to demonstrate the merits of supercapattery that combines capacitive and Nernstian electrodes. Enhanced storage performance is shown by properly pairing and balancing the properties of the negatrode (negative electrode) and positrode (positive electrode) in the AEC or supercapattery. In addition, the design, laboratory manufacturing and performance of several stacks of bipolarly connected AEC cells are assessed in terms of commercial feasibility and promise.

Item Type: Article
Keywords: Asymmetrical electrochemical capacitors; Supercapattery; Charge storage mechanisms; Pseudocapacitance; Delocalised valence electrons; Nernstian storage
Schools/Departments: University of Nottingham Ningbo China > Faculty of Science and Engineering > Department of Chemical and Environmental Engineering
University of Nottingham, UK > Faculty of Engineering > Department of Chemical and Environmental Engineering
Identification Number: 10.1016/j.electacta.2017.06.088
Depositing User: Eprints, Support
Date Deposited: 12 Jul 2017 10:09
Last Modified: 12 Jul 2017 20:43
URI: http://eprints.nottingham.ac.uk/id/eprint/44115

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