All-in-one Biomass-Based Flexible Supercapacitors with High Rate Performance and High Energy Density

被引:32
作者
Liu, Bei [1 ,2 ]
Ye, Yong [1 ]
Yang, Mei [1 ]
Liu, Yijiang [1 ]
Chen, Hongbiao [1 ]
Li, Huaming [1 ]
Fang, Wenhui [3 ]
Qiu, Jieshan [3 ]
机构
[1] Xiangtan Univ, Coll Chem, Xiangtan 411105, Hunan, Peoples R China
[2] Xiangtan Univ, Foshan Green Intelligent Mfg Res Inst, Foshan 5283311, Guangdong, Peoples R China
[3] Beijing Univ Chem Technol, Coll Chem Engn, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
关键词
all-in-one; biomass; carbon sponge; cellulose separator; flexible supercapacitors; EULALIOPSIS-BINATA; ELECTRODE MATERIAL; CARBON; SEPARATOR; CAPACITANCE; NANOSHEETS; MEMBRANE; LIQUOR;
D O I
10.1002/adfm.202310534
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Taking advantage of the unique structure and properties of gramineous straw that are available across the world in a yearly scale of several hundred million tons, a strategy to design and fabricate flexible high-performance supercapacitors (SCs) is developed, of which the key components including electrode, separator, and electrolyte are all made from the eulaliopsis binata (EB), a ubiquitous gramineous straw. This kind of all-in-one biomass-based flexible supercapacitors (BFSs) is first proposed, with the cuticle-derived fibers (EBMs) as a separator, the pith-derived carbon sponges (EBCs) as an electrode, and the sodium salts of the extracted carboxymethyl cellulose as gel electrolyte. The EBM with uniform diameter size, developed porosity, and abundant -OH/-COOH groups have good flexibility, wettability, and ionic conductivity, far exceeding those of commercial glass-fiber separators. The EBC has a high level of N/O/S co-doping and hierarchical porous structure, resulting in enhanced ion accessibility and supercapacitance. With these advantages, the as-fabricated BFS has shown ultra-high-rate performance, high energy density, and excellent flexibility, surpassing the biomass-derived flexible supercapacitors reported thus far. This novel approach will shed light on the value-added utilization of biomass from the viewpoint of molecular chemical engineering and product engineering and pave the way for fabricating flexible high-performance SCs and beyond. A new all-in-one biomass-based flexible supercapacitor (BFS) is first proposed and fabricated via all-round utilization of gramineous straw, with the pith-derived carbon sponges (EBC) as the electrode, the cuticle-derived uniform-sized fibers (EBM) as the separator, and the sodium salts of the extracted carboxymethyl cellulose as the gel electrolyte. The BFS has shown an ultra-high-rate performance, high energy density, and excellent flexibility, surpassing the biomass-derived flexible supercapacitors (SCs) reported in the literature thus far.image
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页数:10
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