Porous carbon fiber electrode for flow battery and preparation method of porous carbon fiber electrode
A porous carbon fiber and liquid flow battery technology, which is applied in the directions of battery electrodes, fiber treatment, fiber chemical characteristics, etc., can solve the problems that porous fiber filaments are difficult to obtain a uniformly distributed pore structure, and cannot contribute specific surface area, etc., to achieve good transmission performance, Effect of reducing activation loss and improving overall performance
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Embodiment 1
[0046] A porous carbon fiber electrode is prepared by the following method:
[0047] (1) Weigh 3g of polyvinyl alcohol and 17g of deionized water, mix, heat and dissolve in a 70°C water bath; add 10 μL of 5wt% boric acid, and stir for 2h in a 70°C water bath; add 15g of PTFE water emulsion with a mass fraction of 60%. Stir at room temperature for 6h;
[0048] (2) Take 15mL of the precursor solution in step (1), connect a 20G (inner diameter 0.60mm) needle, and set the advancing speed of the solution to 1.0mL h -1 , the electrospinning voltage is 17kV, the distance from the needle to the receiving end is 20cm, the rotating speed of the receiving wheel is 200rpm, the ambient temperature is 25°C, the relative humidity is 40%, and the composite fiber membrane is removed after spinning for 10h;
[0049] (3) Put the composite fiber membrane in step (2) in a muffle furnace, pre-oxidize at 280 °C for 1 h, and the heating rate is 2 °C min -1 ; Place the pre-oxidized composite fiber m...
Embodiment 2
[0055] A porous carbon fiber electrode is prepared by the following method:
[0056] (1) Weigh 2g of polyvinyl alcohol and 18g of deionized water, mix, heat and dissolve in a 70°C water bath, add 2.5g of lignin, continue heating and stirring for 10h; add 13.5g of PTFE water emulsion with a mass fraction of 60%, and Stir for 6h;
[0057] (2) Take 15mL of the precursor solution in step (1), connect a 20G (inner diameter 0.60mm) needle, and set the advancing speed of the solution to 1.0mL h -1 , the electrospinning voltage is 17kV, the distance from the needle to the receiving end is 20cm, the rotating speed of the receiving wheel is 200rpm, the ambient temperature is 25°C, the relative humidity is 40%, and the composite fiber membrane is removed after spinning for 10h;
[0058] (3) Put the composite fiber membrane in step (2) in a muffle furnace, pre-oxidize at 280 °C for 1 h, and the heating rate is 2 °C min -1 ; Place the pre-oxidized composite fiber membrane under a nitroge...
Embodiment 3
[0062] A porous carbon fiber electrode is prepared by the following method:
[0063] (1) Weigh 2g of polyvinyl alcohol and 18g of deionized water, mix, heat and dissolve in a water bath at 70°C, add 2.5g of lignin, continue heating and stirring for 10h; add 5g of PTFE water emulsion with a mass fraction of 60%, and Stir for 6h;
[0064] (2) Take 15mL of the precursor solution in step (1), connect a 20G (inner diameter 0.60mm) needle, and set the advancing speed of the solution to 1.0mL h -1 , the electrospinning voltage is 17kV, the distance from the needle to the receiving end is 20cm, the rotating speed of the receiving wheel is 200rpm, the ambient temperature is 25°C, the relative humidity is 40%, and the composite fiber membrane is removed after spinning for 10h;
[0065] (3) Put the composite fiber membrane in step (2) in a muffle furnace, pre-oxidize at 280 °C for 1 h, and the heating rate is 2 °C min -1 ; Place the pre-oxidized composite fiber membrane under a nitroge...
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