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Vanadium Oxygen Fuel Cell Utilising High Concentration Electrolyte

1
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney 2052, Australia
2
School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
3
Fraunhofer-Institute for Chemical Technology, Joseph-von-Fraunhofer-Str. 7, 76327 Pfinztal, Germany
4
CENELEST, German-Australian Alliance for Electrochemical Technologies for Storage of Renewable Energy, School of Mechanical and Manufacturing Engineering, UNSW, Sydney 2052, NSW, Australia
*
Author to whom correspondence should be addressed.
Batteries 2019, 5(1), 24; https://doi.org/10.3390/batteries5010024
Received: 20 December 2018 / Revised: 8 February 2019 / Accepted: 12 February 2019 / Published: 19 February 2019
(This article belongs to the Special Issue Vanadium Redox Flow Battery and Its Applications)
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Abstract

A vanadium oxygen fuel cell is a modified form of a conventional vanadium redox flow battery (VRFB) where the positive electrolyte (VO2+/VO2+ couple) is replaced by the oxygen reduction (ORR) process. This potentially allows for a significant improvement in energy density and has the added benefit of overcoming the solubility limits of V (V) at elevated temperatures, while also allowing the vanadium negative electrolyte concentration to increase above 3 M. In this paper, a vanadium oxygen fuel cell with vanadium electrolytes with a concentration of up to 3.6 M is reported with preliminary results presented for different electrodes over a range of current densities. Using precipitation inhibitors, the concentration of vanadium can be increased considerably above the commonly used 2 M limit, leading to improved energy density. View Full-Text
Keywords: vanadium-oxygen fuel cell; high concentration vanadium electrolyte; high energy density; oxygen reduction vanadium-oxygen fuel cell; high concentration vanadium electrolyte; high energy density; oxygen reduction
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Risbud, M.; Menictas, C.; Skyllas-Kazacos, M.; Noack, J. Vanadium Oxygen Fuel Cell Utilising High Concentration Electrolyte. Batteries 2019, 5, 24.

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