Preparation of Starch-Derived Porous Carbon with Improved Yield by Autogenic Pressure Carbonization and KOH Activation for High-Performance Supercapacitor

The preparation of carbon materials from biomass for energy storage is a sustainable approach to mitigate the issues of fossil fuel shortage and climate change. Starch is a desirable precursor for the preparation of carbon material due to its high carbon content, renewability, and low cost. However, the pyrolysis of starch produces a high yield of volatile products and low yield of carbon, which hinder its application. In this study, a sustainable method was developed to improve the carbon yield of starch and develop hierarchical porosity. Autogenic pressure carbonization produced additional deposit carbon besides the residual carbon. The carbon yield was improved to 32