The South China University of Technology

Guangdong University of Technology

Zhixian Li

Xueqing Qiu

Dongjie Yang

Hongming Lou

Jinhao Huang

Weifeng Liu

Yong Qian

Xinping Ouyang

Yuxia Pang

Zhiqiang Fang

Yanlin Qin

Huan Wang

The present invention belongs to the technical field of biomass carbon materials, and relates to a lignin porous carbon nanosheet, a preparation method therefor, and an application thereof in supercapacitor electrode materials. The method of the present invention performs layer-by-layer self-assembly of sulfonated lignin and oxalate in a selective solvent to prepare a layer-by-layer self-assembled lignin/oxalate composite, which is then carbonized and pickled to obtain the lignin porous carbon nanosheets. The lignin porous carbon nanosheets prepared by the above method of the present invention have a specific surface area of 200-1500 m/g, a micropore specific surface area of 100-500 m/g, a mesoporous specific surface area of 100-1000 m/g, a pore diameter of 0.5-30 nm, and a pore volume of 0.5-1.5 cm/g; they can be applied to supercapacitor electrode materials, showing higher specific capacitance and excellent rate performance (with a specific capacitance retention rate of 76.6%), having good potential application value.

Lignin porous carbon nanosheet, preparation method therefor, and application thereof in supercapacitor electrode materials

The present invention discloses a lignin-based hierarchical porous carbon with high specific surface area and preparation method and application thereof. The present invention employs maleic anhydride, acrylic acid, and hypophosphorous acid to modify a lignin, then performs a cross-linking reaction with a glutaraldehyde-triethanolamine condensate to prepare a lignin graft-copolymerized by phosphino carboxylic acid copolymer, and then dropwise adding a soluble calcium salt solution and a soluble carbonate solution into the lignin graft-copolymerized by phosphino carboxylic acid copolymer dispersion successively, co-precipitates to prepare a lignin/nano CaCOcomplex, finally obtains a lignin-based hierarchical porous carbon with high specific surface area through carbonizing at a high temperature. The preparation method of the present invention may enable nano CaCOto be uniformly and stably dispersed in a three-dimensional network structure of the lignin graft-copolymerized by phosphino carboxylic acid copolymer, realizing full and uniform complexation of the lignin with nano CaCO.

Lignin-based hierarchical porous carbon with high specific surface area and preparation method and application thereof

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Guangzhou, China

Zhixian Li