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Laboratory XANES to study vanadium species in vanadium redox flow batteries

Published online by Cambridge University Press:  29 April 2020

Christian Lutz  and
Ursula Elisabeth Adriane Fittschen Open the ORCID record for Ursula Elisabeth Adriane Fittschen [Opens in a new window]
Christian Lutz
Affiliation:
Clausthal University of Technology, Institute of Inorganic and Analytical Chemistry, Clausthal-Zellerfeld38678, Germany
Ursula Elisabeth Adriane Fittschen*
Affiliation:
Clausthal University of Technology, Institute of Inorganic and Analytical Chemistry, Clausthal-Zellerfeld38678, Germany
*
a)Author to whom correspondence should be addressed. Electronic mail: ursula.fittschen@tu-clausthal.de
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Abstract

The speciation of vanadium in the electrolyte of vanadium redox flow batteries (VRFBs) is important to determine the state of charge of the battery. To obtain a better understanding of the transport of the different vanadium species through the separator polymer electrolyte membranes, it is necessary to be able to determine concentration and species of the vanadium ions inside the nanoscopic water body of the membranes. The speciation of V in the electrolyte of VRFBs has been performed by others at the synchrotron by X-ray absorption near-edge structure analysis (XANES). However, the concentrations are quite high and not necessarily justify the use of a large-scale facility. Here, we show that vanadium species in the electrolyte and inside the ionomeric membranes can be determined by laboratory XANES. We were able to determine V species in the 1.6 M electrolyte with a measurement time of 2.3 h and V species having a concentration of 9.8 g kg−1 inside the membranes (178 µm thick) with a measurement time of 5 h. Our results show that laboratory XANES is an appropriate tool to study these kind of samples.

Keywords

NafionPEMelectrolyteXAFSlaboratory-based XANES
Type
Proceedings Paper
Information
Powder Diffraction , Volume 35 , Supplement S1 , December 2020 , pp. S24 - S28
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Copyright
Copyright © International Centre for Diffraction Data 2020

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