Abstract
An experimental setup with two external saturated calomel reference electrodes(SCE)and two flow cells was established for flow battery research application.By using this setup,the cell voltage,potentials and open circuit potentials of the positive and negative electrodes for a lab-scale flow battery single cell,could be determined simultaneously during charge-discharge(C-D) cycle test.Then,the ohmic internal resistance drop(iR drop),overpotentials at the negative and positive electrodes of the cell during C-D process,were calculated.The average iR drop accounts for about 74% of the total voltage losses during the C-D cycle at current density of 60 mA·cm-2,suggesting the voltage efficiency(VE) of vanadium redox-flow battery(VRB) single cell with graphite felt as electrodes and Nafion 117 as battery separator,was limited by the cell ohmic internal resistance.The C-D curves show that the appearance of the end-point of discharge is mainly due to the zoom of negative electrode over potential.The VRB single cell designed in this work achieves an excellent performance,with voltage and energy efficiency up to ca.89% and 85%,respectively,at C-D current density of 60 mA·cm-2,indicating structure of the cell is reasonable,and graphite felt is suitable for VRB electrode application.
Keywords
all-vanadium redox-flow cell, graphite felt, electrode polarization, ohmic internal resistance
Publication Date
2007-02-28
Online Available Date
2007-02-28
Revised Date
2007-02-28
Received Date
2007-02-28
Recommended Citation
Ping ZHAO, Hua-min ZHANG, Yue-hua WEN, Bao-lian YI.
Charge-Discharge Behaviors and Properties of a Lab-Scale All-Vanadium Redox-Flow Single Cell[J]. Journal of Electrochemistry,
2007
,
13(1): 12-18.
DOI: 10.61558/2993-074X.1774
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol13/iss1/3
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