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Preliminary study of H_2-Fe~(3+)/Fe~(2+) redox flow battery

A novel redox flow cell: H2-Fe3+/Fe2+ redox flow battery was proposed. The electrochemical performance and charging and discharging performance of Fe3+/Fe2+ on the raw and thermally treated PAN based graphite felt were investigated. The thermally treated graphite felt had made the electrochemical active area larger, the charge transfer resistance of Fe3+/Fe2+ lower and lowered the polarization of the cell. A H2-Fe3+/Fe2+ redox flow battery for test was assembled with the thermally treated graphite felt as the activation layer of the positive electrode, and the carbon paper as the negative electrode. At an operating current density of 50 m A/cm2, the voltage efficiency of 87.43% for the cell was achieved. The resistance of the cell using thermally treated graphite felt decreased 50% compared to the cell using raw graphite felt.