Microstructure and electrochemical properties of porous carbon derived from biomass

Abstract

In this paper, natural macromolecular substances in biomass cellulose (hempseed hemp degumming treatment), pectin (purchase: extracted from citrus) and sulfonated lignin (purchase) are selected as three raw materials. After being sintered into porous carbon by tube furnace, the prepared porous carbon of biomass is characterized by XRD, BET and other methods, and the similarities and differences of its microstructure and element distribution are analyzed. At the same time, the electrochemical properties of three kinds of biomass porous carbon and graphene were tested and compared. The results show that the content of C element in the porous carbon prepared by cellulose is 90.3 %, and the graphitization degree is better than the latter two, and the element composition and microstructure are more similar to that of graphene. The surface of carbon materials prepared by sulfonated lignin contains rich functional groups, such as -COOH, -C-O, etc. The electrochemical performance test results show that the porous carbon material prepared from cellulose has the highest specific capacitance of 150F/g at 1A, the largest 5 mV CV curve area, and the EIS map shows that its internal resistance is small, and has good electrochemical performance. At the same time, it is found that the molecular structure of cellulose is unstable and the chemical bond is easy to break, forming new small molecular structure and accumulating biochar materials.