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Molecules 2015, 20(11), 20499-20517; doi:10.3390/molecules201119711

Redox Species of Redox Flow Batteries: A Review

Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
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Author to whom correspondence should be addressed.
Academic Editors: Derek J. McPhee and Sergei Manzhos
Received: 16 October 2015 / Revised: 9 November 2015 / Accepted: 9 November 2015 / Published: 18 November 2015
(This article belongs to the Special Issue Molecular Engineering for Electrochemical Power Sources)
View Full-Text   |   Download PDF [2048 KB, uploaded 18 November 2015]   |  

Abstract

Due to the capricious nature of renewable energy resources, such as wind and solar, large-scale energy storage devices are increasingly required to make the best use of the renewable power. The redox flow battery is considered suitable for large-scale applications due to its modular design, good scalability and flexible operation. The biggest challenge of the redox flow battery is the low energy density. The redox active species is the most important component in redox flow batteries, and the redox potential and solubility of redox species dictate the system energy density. This review is focused on the recent development of redox species. Different categories of redox species, including simple inorganic ions, metal complexes, metal-free organic compounds, polysulfide/sulfur and lithium storage active materials, are reviewed. The future development of redox species towards higher energy density is also suggested. View Full-Text
Keywords: redox flow battery; redox species; energy density redox flow battery; redox species; energy density
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pan, F.; Wang, Q. Redox Species of Redox Flow Batteries: A Review. Molecules 2015, 20, 20499-20517.

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