Resolving Losses at the Negative Electrode in All-Vanadium Redox Flow Batteries Using Electrochemical Impedance Spectroscopy

2014 ◽  
Vol 161 (6) ◽  
pp. A981-A988 ◽  
Author(s):  
Che-Nan Sun ◽  
Frank M. Delnick ◽  
Douglas S. Aaron ◽  
Alexander B. Papandrew ◽  
Matthew M. Mench ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Negative Electrode ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

scholarly journals Verification of Redox Flow Batteries’ Functionality by Electrochemical Impedance Spectroscopy Tests

Batteries ◽  
2018 ◽  
Vol 4 (4) ◽  
pp. 58 ◽  
Author(s):  
Daniel Manschke ◽  
Thorsten Seipp ◽  
Sascha Berthold ◽  
K. Friedrich
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Comparison Method ◽  
Redox Flow Batteries ◽  
Current Voltage ◽  
Flow Batteries ◽  
Quantitative Statement ◽  
Characteristic Values ◽  
Eis Measurements

The state-of-the-art functionality test of classic redox-flow-stacks measures the current–voltage characteristic with the technical electrolyte. This research paper aims to simplify the validation of redox flow batteries’ functionality by conducting electrochemical impedance spectroscopy (EIS) on redox flow stacks. Since the electrolyte used in the batteries is usually toxic and aggressive, it would be a significant simplification to verify the functionality with an alternative, non-toxic fluid. EIS measurements on batteries with larger sized electrodes, multiple cells, and different fluids were performed. It was demonstrated that all impedances are repeatable, thereby validating this procedure as a qualification method for full-size and complex batteries with an alternative fluid. EIS measurements were able to detect deliberately manipulated cells. This research uses three different analysis methods for the acquired data to identify errors. The respective approaches are, firstly, (1) a comparison of the Nyquist plots; secondly, (2) a comparison of the Bode plots; and thirdly, (3) a comparison of the calculated characteristic values of the equivalent circuits. The analysis found that all methods are suitable to detect errors in the batteries. Nevertheless, the bode-plot comparison method proves to be especially advantageous, because it enables a quantitative statement.

Hydrogen evolution at the negative electrode of the all-vanadium redox flow batteries

2014 ◽  
Vol 248 ◽  
pp. 560-564 ◽  
Author(s):  
Che-Nan Sun ◽  
Frank M. Delnick ◽  
Loïc Baggetto ◽  
Gabriel M. Veith ◽  
Thomas A. Zawodzinski
Keyword(s):  
Hydrogen Evolution ◽  
Negative Electrode ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Probing Electrode Losses in All-Vanadium Redox Flow Batteries with Impedance Spectroscopy

2013 ◽  
Vol 2 (5) ◽  
pp. A43-A45 ◽  
Author(s):  
C.-N. Sun ◽  
F. M. Delnick ◽  
D. S. Aaron ◽  
A. B. Papandrew ◽  
M. M. Mench ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

scholarly journals High-power nitrided TiO2 carbon felt as the negative electrode for all-vanadium redox flow batteries

Carbon ◽  
2019 ◽  
Vol 148 ◽  
pp. 91-104 ◽  
Author(s):  
J. Vázquez-Galván ◽  
C. Flox ◽  
J.R. Jervis ◽  
A.B. Jorge ◽  
P.R. Shearing ◽  
...  
Keyword(s):  
High Power ◽  
Negative Electrode ◽  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox
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