Cotton fiber-derived ultrafine activated carbon fiber for supercapacitor electrode: The effect of fibrillation.

Activated carbon fiber (ACF) is a fibrous activated carbon (AC) characterized by high specific surface area (SSA), abundant micropore structure, and excellent machinability, making it an ideal electrode material. This work provided a theoretical basis for the sustainable and large-scale production of high-performance ACF from natural cellulose through fibrillation treatment, papermaking techniques, and CO activation. The effect of fiber fibrillation degree on ACF's structure and electrochemical performance was investigated in detail.