期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 300, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110178
关键词
Lignin; Microwave heating; Porous carbon; Electrode; Supercapacitor
类别
资金
- Nanjing Forestry University [163020126]
- National Science and Technology Achievements Project in Forestry [[2016]42]
- National Natural Science Foundation of China [31400515]
- Qing Lan Project
Searching an appropriate biomass that is capable of absorbing microwave energy is significant to realize its rapid microwave-assisted conversion into porous carbons (PCs). Herein, the lignin derived from waste pulping black liquor via crude extraction is directly converted into high-performance PC for a very short duration of 10-30 min by microwave heating. The inherent inorganic salts in crude lignin with a high content of 17.3% is innovatively used as initial microwave absorber to achieve rapid conversion from lignin into bio-char, and further as porogen combined with KOH to synergistically obtain well-developed porous texture. The resultant PC possesses a super high specific surface area of 3065 m(2) g(-1), hierarchical pore size distribution with abundant micropores (0.73 cm(3) g(-1)) and a remarkable meso-/macropores ratio of 64.4%, highly disordered and amorphous structure, as well as oxygen-enriched structure with a surface oxygen content up to 16.5%. These attractive characteristics contribute to excellent electrochemical properties of the resultant supercapacitor electrode which exhibits a high specific capacitance of 325 F g(-1) at 0.5 A g(-1) in 6 mol L-1 KOH electrolyte, still maintaining a high value of 258 F g(-1) (79.4%) at 50 A g(-1). The prepared supercapacitor can remain 81.9% energy density when the power density was increased by 20 folds, suggesting its excellent energy-power synergetic outputting property. These attractive results pave a new way to utilize such a biomass waste, especially with high inorganic salts content, into value-added electrode material for advanced energy storage application.
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