Organic positive electrode active material for aqueous redox flow battery
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experimental example 1
[0034]To check redox characteristics of the positive electrode electrolyte prepared in Example 1, cyclic voltammetry was carried out using glassy carbon, Ag / AgCl and a platinum (Pt) wire as a working electrode, a reference electrode, and a counter electrode, respectively. Current values measured at a working electrode when a voltage spanning from −0.6 to 1.2 V was applied to the working electrode with a varying scan rate of 50 to 200 mV / s were recorded. The results are shown in FIG. 1.
[0035]Results
[0036]Referring to FIG. 1, from the results evaluated by the cyclic voltammetry, it can be seen that an oxidation / reduction current peak value increases as the scan rate increases, and this was a 2e− reaction because two peaks were observed during a reduction process. These results suggested that a reversible redox reaction was possible in an acidic aqueous solution.
[0037]Also, FIG. 2 is an image of the 4-aminophenol aqueous solution before and after the cyclic voltammetry test. It was con...
example 1
[0038]Positive and negative electrodes were manufactured using carbon felt with a size of 5×5 cm2, a bipolar plate, and a gold current collector. In this case, Nafion 115 was used as the ion exchange membrane.
[0039]The electrolyte prepared in Preparative Example 1 was used as the positive electrode electrolyte. For the negative electrode electrolyte, 1.0 M vanadium sulfate (VOSO4) was dissolved in an aqueous 3.0 M sulfuric acid solution (H2SO4) to prepare a tetravalent vanadium (VO2+) solution, and the solution was electrically reduced to form trivalent vanadium ions (V3+), which was then used.
[0040]A redox flow battery was manufactured using the battery thus assembled, the negative electrode electrolyte, and the positive electrode electrolyte prepared in Example 1. In this case, the electrolyte was circulated at a rate of 25 cc / min using a pump.
experimental example 2
[0042]To evaluate the charge / discharge characteristics of the redox flow battery manufactured in Example 1, the redox flow battery was charged and discharged at +100 mA in a voltage range of 0.1 to 1.4 V, and charge / discharge voltages with time are shown in FIG. 3.
[0043]Results
[0044]FIG. 3 is a graph illustrating a change in voltage for 16th to 20th charge / discharge cycles from the beginning. It was revealed that the redox flow battery was rechargeable and re-dischargeable within the same period of time at the same voltage as previously even when the number of charge / discharge cycles increased. That is, it can be seen that the redox reaction of the electrolyte on surfaces of the electrodes was reversible. Therefore, it can be seen that the charge / discharge behaviors of the single cell using 4-aminophenol as the positive electrode electrolyte were determined, and a working voltage range of the single cell was confirmed.
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