All-cellulose-based quasi-solid-state supercapacitor with nitrogen and boron dual-doped carbon electrodes exhibiting high energy density and excellent cyclic stability  

作　　者：Kaixuan Li Ping Li Zining Sun Jing Shi Minghua Huang Jingwei Chen Shuai Liu Zhicheng Shi Huanlei Wang 

机构地区：[1]School of Materials Science and Engineering,Ocean University of China,Qingdao,266100,China

出　　处：《Green Energy & Environment》2023年第4期1091-1101,共11页绿色能源与环境（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.22179123 and 21471139);the Shandong Provincial Natural Science Foundation,China (ZR2020ME038);the Fundamental Research Funds for the Central Universities (No.201941010);the Shandong Provincial Key R&D Plan and the Public Welfare Special Program,China (2019GGX102038);the Qingdao City Programs for Science and Technology Plan Projects (19-6-2-77-cg)。

摘　　要：The key to construct high-energy supercapacitors is to maximize the capacitance of electrode and the voltage of the device. Realizing this purpose by utilizing sustainable and low-cost resources is still a big challenge. Herein, N, B co-doped carbon nanosheets are obtained through the proposed dual-template assisted approach by using methyl cellulose as the precursor. Due to the synergistic effects form the high surface area with the hierarchical porous structure, N/B dual doping, and a high degree of graphitization, the resultant carbon electrode exhibits a high capacitance of 572 F g^(-1)at 0.5 A g^(-1)and retains 281 F g^(-1)at 50 A g^(-1)in an acidic electrolyte. Furthermore, the symmetric device assembled using bacterial cellulose-based gel polymer electrolyte can deliver high energy density of 43 W h kg^(-1)and excellent cyclability with 97.8% capacity retention after 20 000 cycles in “water in salt” electrolyte. This work successfully realizes the fabrication of high-performance allcellulose-based quasi-solid-state supercapacitors, which brings a cost-effective insight into jointly designing electrodes and electrolytes for supporting highly efficient energy storage.

关 键 词：Dual doping Carbon materials Quasi-solid-state supercapacitor Cellulose Hierarchical structure 

分 类 号：TM53[电气工程—电器]