Hierarchically porous N-doped carbon nanosheet aerogel cathodes for Zn-ion hybrid supercapacitors with superhigh energy density

被引:19
作者
Xing, Xiaohua [1 ]
Wang, Xiao [1 ]
Wang, Wenyun [2 ]
Yang, Chao [2 ]
Wang, Haizeng [1 ]
机构
[1] Ocean Univ China, Coll Chem & Chem Engn, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China
[2] Qufu Normal Univ, Sch Phys & Phys Engn, Qufu 273165, Shandong, Peoples R China
关键词
N-doped; Carbon nanosheet; Carbon aerogel; Hierarchical pore; Hybrid supercapacitor; GRAPHENE HYDROGELS; PERFORMANCE; NITROGEN; ELECTRODE; NANOFIBERS; LITHIUM; LIFE;
D O I
10.1016/j.est.2023.107822
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Carbon nanomaterials with large specific surface area and high electronic conductivity, have been widely used as capacitive cathode materials for Zn-ion hybrid supercapacitors. Doping of heteroatoms and regulation of pore structure are crucial for boosting the energy storage performances of the carbon-based cathodes. We propose a N -doped carbon nanosheet aerogel (N-CNAG) with high active N content and hierarchically porous structure, which can be prepared by the bubble-templated polymerization of Py and the carbonization of the PPy nanosheet hydrogel (PPyNHG). The high active N content of N-CNAG can produce high pseudocapacitance through the N-dependent electrochemical redox reactions. The hierarchically porous structure of N-CNAG can facilitate fast electrolyte ion diffusion. Based on the Zn anode and the N-CNAG cathode, the Zn-ion hybrid supercapacitor can provide a remarkable specific capacitance of 706 F g-1 at 1 A g-1 and the rate capability of 50 % from 1 A g-1 to 5 A g-1, mainly attributed to the high active N content and the hierarchically porous structure of N-CNAG. Additionally, this Zn-ion hybrid supercapacitor provides the superhigh energy density of 392 Wh kg-1 at 1 kW kg-1 and the cycling stability of 87.4 % after 10,000 cycles, holding great potential for developing high-energy-density Zn-ion hybrid supercapacitors.
引用
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页数:9
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