Honeycomb-like Hierarchical Porous Carbon from Lignosulphonate by Enzymatic Hydrolysis and Alkali Activation for High-Performance Supercapacitors

Porous carbon materials (PCs) were prepared via hydrothermal carbonization from calcium lignosulfonate (CL) based on enzymatic hydrolysis and alkali activation. The effects of different KOH feeding ratios the structure electrochemical properties CL (EHCL)-derived PCs evaluated in detail. results showed that EHCL-derived a higher SSA than CL. When mass ratio KOH/EHCL was 3/2, exhibited honeycomb-like microscopic morphology with specific surface area up to 1771 m2/g 3D hierarchical porous composed abundant micropores, mesopores, macropores. As an electrode supercapacitor, highest capacitance 147 F/g at current density 0.25 A/g, it maintained 78% initial value high 10 A/g. excellent cycle structural stability confirmed condition retention 95.2% after 5000 times galvanostatic charge/discharge. This work provides potential application high-performance supercapacitors.