期刊
FUEL
卷 357, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2023.129653
关键词
Cellulase; Porous carbon; Cottonseed meal; Supercapacitor
Enzyme-assisted pretreatment of cottonseed meal using cellulase can produce carbon materials with hierarchical porous structure and high oxygen content, exhibiting excellent electrochemical performance and energy density.
Enzyme, as a type of biocatalyst, has a superior degradability on the biomass component. Herein, the cellulase degradation of cottonseed meal (CCM) is used as carbon source and potassium citrate as activating agent to fabricate O, S, N co-doped carbon materials. Cellulase pretreatment degrades the cellulose (from 12.48 wt% to 2.24 wt%) of cottonseed meal (CM) as well as creates the pore structure. Most importantly, the enzymolytic process can enhance the O content and improve the activation efficiency of potassium citrate. The optimized CCM-800-2 with hierarchical porous structure and high O (11.33 at%) content exhibits a high specific capacitance of 364 F g-1 in 6 M KOH electrolyte. In addition, the assembled potassium citrate-chitosan gel electrolytebased symmetric supercapacitor with 20 mg cm-2 mass loading of active material shows a high energy density of 28.8 Wh kg-1. This study provides an efficient enzyme assisted pretreatment and low activator ratio strategy to prepare biomass-based porous carbon, and expects to fabricate more carbon materials using other carbon precursors.
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