Manganese dioxide composite nitrogen-sulfur double-doped porous carbon as well as preparation method and application thereof
A manganese dioxide and porous carbon technology, which is used in the manufacture of hybrid/electric double layer capacitors, electrodes of hybrid capacitors, etc., can solve the problems of lower energy density than batteries and limited practical applications.
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Embodiment 1
[0027] (1) Dissolve thiourea and hydrochloric acid in deionized water at 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, take 5ml of the solution and inject them into cylindrical molds, and then drop 5ml into the step (1 ) to obtain an acidified thiourea solution, which was allowed to stand for 24 hours to prepare a block gel;
[0029] (3) Wash the bulk gel obtained in step (2) with deionized water until the washing liquid is neutral, and then freeze-dry;
[0030] (4) The block gel after freeze-drying in step (3) was carbonized at 700°C for 2 hours under the protection of nitrogen to obtain manganese dioxide composite nitrogen-sulfur double-doped porous carbon.
Embodiment 2
[0032] The amount of potassium permanganate added in step (2) was 0.04g, and the rest of the steps were the same as in Example 1.
Embodiment 3
[0034] The amount of potassium permanganate added in the step (2) is 0.06g, and all the other steps are the same as in Example 1
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