Electrode treated by persulfate and application thereof
A persulfate and electrode technology, which is applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of high production cost, poor electrocatalytic activity, and many processes, and achieve prolonging service life, simple preparation method, and high comprehensive performance Effect
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[0021] Example 1
[0022] Cut out a carbon felt with a thickness of 6 mm in an appropriate size, soak it in an aqueous solution of 0.5 mol / L potassium persulfate at 80 °C, take out the electrode after 12 hours, wash it repeatedly with water, and dry it for later use.
[0023] The prepared electrode materials are used as the positive and negative electrodes, the bipolar plate is a graphite plate, and the ion exchange membrane is a Nafion membrane produced by DuPont, with an effective area of 48 cm. 2 , assemble an alkaline zinc-iron flow battery with a current density of 80 mA / cm 2 . Among them, the positive electrolyte is containing ferrocyanide ion (Fe(CN) 6 4- ) alkaline solution, wherein the concentration of ferrocyanide ion is 1mol L -1 , the concentration of hydroxide ions is 3mol / L; the negative electrolyte is an alkaline solution containing zincate ions, wherein the concentration of zincate ions is 0.5mol L -1 , the concentration of hydroxide ions was 3mol / L; the...
Example Embodiment
[0030] Embodiment 2 (soaking time is non-optimal condition)
[0031] Compared with Example 1, the soaking time was changed to 0.2h, and other conditions remained unchanged. After testing, the battery coulombic efficiency was 94.7%, the voltage efficiency was 85.2%, and the energy efficiency was 80.7%. Battery life is 80 cycles.
[0032] Compared with Comparative Example 1, the coulombic efficiency, energy efficiency and cycle stability of the alkaline system zinc-iron flow battery of the electrode material soaked in the non-preferable time have been improved to a certain extent, but it is different from that of the present invention in Example 1. There is still a small gap compared with the preferred soaking time.
Example Embodiment
[0033] Embodiment 3 (solution concentration is non-optimal condition)
[0034] Compared with Example 1, the potassium persulfate concentration was changed to 0.1 mol / L, and other conditions remained unchanged. After testing, the battery coulombic efficiency was 96.4%, the voltage efficiency was 87.0%, and the energy efficiency was 83.9%. Battery life is 80 cycles.
[0035] Compared with Comparative Example 1, the coulombic efficiency, energy efficiency and cycle stability of the alkaline system zinc-iron flow battery of the electrode material treated in the non-preferred solution concentration have been improved to a certain extent, but the present invention in Example 1 has improved. There is still a small gap compared with the preferred soaking time.
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