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Journal of Spectroscopy
Volume 2013, Article ID 453980, 8 pages
http://dx.doi.org/10.1155/2013/453980
Research Article

Online Spectroscopic Study on the Positive and the Negative Electrolytes in Vanadium Redox Flow Batteries

1Laboratory of Advanced Power Source, Graduate School at Shenzhen, Tsinghua University, Guangdong Province, Shenzhen 518055, China
2Key Laboratory of Thermal Management Engineering and Materials, Graduate School at Shenzhen, Tsinghua University, Guangdong Province, Shenzhen 518055, China
3Laboratory of Optical Imaging and Sensing, Graduate School at Shenzhen, Tsinghua University, Guangdong Province, Shenzhen 518055, China

Received 4 July 2012; Revised 25 August 2012; Accepted 3 September 2012

Academic Editor: Djordje Mandrino

Copyright © 2013 Le Liu et al. 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.

Abstract

Traditional spectroscopic analysis based on the Beer-Lambert law cannot analyze the analyte with high concentration and interference between different compositions, such as the electrolyte in vanadium redox flow batteries (VRBs). Here we propose a new method for online detection of such analytes. We demonstrate experimentally that, by comparing the transmittance spectrum of the analyte with the spectra in a preprepared database using our intensity-corrected correlation coefficient (ICCC) algorithm, parameters such as the state of charge (SOC) of both the positive and the negative electrolytes in the VRB can be online monitored. This method could monitor the level of the electrolytes imbalance in the VRB, which is useful for further rebalancing the electrolyte and restoring the capacity loss of the VRB. The method also has the potential to be used in the online detection of other chemical reactions, in which the chemical reagents have high concentration and interferences between different compositions.