Optimization method for improving yield of starch derived hard carbon

Abstract

The invention provides an optimization method for improving the yield of starch-derived carbon, which comprises the following steps: preparing a mixture of polyphosphoric acid and concentrated phosphoric acid, adding corn starch under an oil bath condition, continuously heating and stirring to completely react, and carbonizing the product in a tubular furnace filled with inert gas to obtain the starch-derived carbon. And washing and drying the final product to obtain the coral reef-shaped bulk starch derived hard carbon. According to the method, the starch is pretreated with the mixed solution of the polyphosphoric acid and the phosphoric acid before the carbonization process, so that the starch is dehydrated and crosslinked, the carbon yield is increased to 30% in the high-temperature pyrolysis process, and the hard carbon material with the coral reef large block structure is obtained. According to the method, foaming of the starch can be inhibited, the specific surface area of the starch-derived hard carbon can be reduced, and the yield of the starch-derived hard carbon is greatly increased. The method disclosed by the invention is low in cost, simple and convenient to operate and capable of realizing large-scale production, and has huge potential in the fields of preparation of starch derived carbon materials and electrochemical application thereof.

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