Graphitic hierarchical porous carbons derived from lignin-hydrogels for high-performance zinc-ion hybrid supercapacitors
Chen F. Zheng Y. Jian W. Li Z. Li J. Li H. Wang Y. Mentbayeva A. Zhang W.
1 February 2025Elsevier Ltd
Journal of Energy Storage
2025#108
Porous carbon materials with tailored pore structures and optimal graphitization levels were synthesized via the calcination of a lignocellulose-based hydrogel precursor composed of alginate (AL), carboxymethyl cellulose (CMC), and potassium hydroxide (KOH) under a nitrogen atmosphere. This innovative approach significantly reduces the reliance on the activation agent KOH, achieving an efficient lignocellulose to KOH ratio of 1:0.5, and simplifies the fabrication process by eliminating the need for adhesives, merely requiring the blending of cellulose derivatives and lignin in an alkaline aqueous phase. The resulting lignocellulose hydrogel-derived porous carbons (LHPCs) demonstrate remarkable performance and durability in zinc-ion hybrid supercapacitors. Notably, LHPC900 stands out with a high specific surface area of 1722 m2 g−1, a substantial micropore volume of 0.307 cm3 g−1, and enhanced graphitization, rendering it an excellent candidate for the cathodes in zinc-ion hybrid capacitors with high specific capacity and superior rate performance. Moreover, LHPCs exhibit superior rate performance and exceptional long-term stability in acetonitrile electrolytes compared to aqueous counterparts, retaining 91.90 % of their capacitance after 60,000 cycles. This work presents a novel, adhesive-free, and KOH-efficient strategy for the preparation of lignin-based porous carbon materials for zinc-ion hybrid supercapacitors, suitable for both aqueous and acetonitrile-based electrolytes.
Hydrogel , Lignin , Porous carbon , Zinc-ion hybrid supercapacitors
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School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China
School of Advanced Manufacturing, Guangdong University of Technology (GDUT), Jieyang, 522000, China
Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, 010000, Kazakhstan
Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, 515200, China
Guangdong Basic Research Center of Excellence for Ecological Security and Green Development, Guangdong University of Technology, Guangzhou, 510006, China
School of Chemical Engineering and Light Industry
School of Advanced Manufacturing
Department of Chemical and Materials Engineering
Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center
Guangdong Basic Research Center of Excellence for Ecological Security and Green Development
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