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

Xin Zhang, Shi Liu, Yuqi Zhao, Haicun Yang and Jinchun Li ()
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Xin Zhang: School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
Shi Liu: School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
Yuqi Zhao: School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
Haicun Yang: School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
Jinchun Li: School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China

Energies, 2023, vol. 16, issue 9, 1-17

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

Keywords: calcium lignosulfonate; enzymatic hydrolysis; alkali activation; hierarchical porosity; supercapacitors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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