A kind of manganese dioxide composite nitrogen-sulfur double-doped porous carbon and its preparation method and application
A manganese dioxide, porous carbon technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of limited practical application and lower energy density than batteries
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Embodiment 1
[0027] (1) Dissolve thiourea and hydrochloric acid in deionized water in a molar ratio of 1:2 to prepare an acidified thiourea solution with a thiourea concentration of 0.05 mol / L;
[0028] (2) Add 0.3g of potassium nitrate and 0.02g of potassium permanganate to 50ml of sodium alginate solution with a mass concentration of 2%, stir evenly, and inject 5ml of the solution into the cylindrical mold respectively, and then drop 5ml of step (1). ) to obtain an acidified thiourea solution, and let stand for 24 hours to prepare a bulk gel;
[0029] (3) washing the bulk gel obtained in step (2) with deionized water until the washing liquid is neutral, and then freeze-drying;
[0030] (4) Carbonizing the lyophilized bulk gel in step (3) at 700° C. under nitrogen protection for 2 h to obtain manganese dioxide composite nitrogen-sulfur double-doped porous carbon.
Embodiment 2
[0032] The amount of potassium permanganate added in step (2) was 0.04 g, and the remaining steps were the same as in Example 1.
Embodiment 3
[0034] The amount of potassium permanganate added in step (2) is 0.06g, and the remaining steps are the same as in Example 1
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