Citation: Zhao Jing, Gong Junwei, Li Yiju, Cheng Kui, Ye Ke, Zhu Kai, Yan Jun, Cao Dianxue, Wang Guiling. Self N-Doped Porous Interconnected Carbon Nanosheets Material for Supercapacitors[J]. Acta Chimica Sinica, ;2018, 76(2): 107-112. doi: 10.6023/A17090422 shu

Self N-Doped Porous Interconnected Carbon Nanosheets Material for Supercapacitors

Harbin Engineering University, College of Materials Science and Chemical Engineering, Harbin 150001

Corresponding author: Wang Guiling, wangguiling@hrbeu.edu.cn
Received Date: 17 September 2017
Available Online: 13 February 2017
Fund Project: the National Natural Science Foundation of China 21503055Project supported by the National Natural Science Foundation of China (Nos. 51572052, 21503055)the National Natural Science Foundation of China 51572052

Figures(5)

Self N-doped porous cross-linked carbon nanosheets (N-ICNs) are prepared by one-step activation carbonization using dandelion seeds. The dandelion seeds are rich in nitrogen without any additional doping treatment, which can be served as an ideal carbon precursor. The microstructure and composition of the prepared carbon materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). It can be seen from the SEM and TEM spectra that the N-ICNs exhibit the porous interconnected structure, which can facilitate the transfer of the electrons and the dispersion of the electrolyte ions. Moreover, the XRD spectra show the defects in the amorphous carbon material. Nitrogen adsorption/desorption isotherms of the N-ICNs show a high specific surface area of 1564 m²·g^-1, and the pore size distribution shows numerous micropores and macropores, which contributes to the formation of double layer capacitance and the accessibility of the electrolyte ions. The wide-scan spectra present the presence of C, N and O atoms. Interestingly, the N content of the N-ICNs without any extra doping treatment is high (2.88%). Based on the high nitrogen content, the N-ICNs exhibit a good specific capacitance of 337 F·g^-1 at a current density of 1 A·g^-1 with an excellent capacitance retention of 99% after 10000 cycles. The good electrochemical performances mainly caused by the nitrogen functional groups in the carbon lattice, which can improve the wettability as well as provide pseudocapacitance due to the redox reactions of amine groups. In addition, the symmetric supercapacitor assembled with N-ICNs in the operating voltage range of 0~2 V shows high energy density of 25.3 Wh·kg^-1 at the power density of 900 W·kg^-1, which are superior than the other carbon materials reported. And the capacitance retention can retain 98% after 10000 cycles. Therefore, the low-cost biomass-derived porous interconnected carbon material can be a promising electrode material for supercapacitors.
- self N-doping,
- porous interconnected carbon nanosheets,
- symmetric supercapacitor,
- biomass
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