Nitrogen-Doped Hierarchical Porous Activated Carbon Derived from Paddy for High-Performance Supercapacitors

Materials

Li Yang¹  Ruowei Yi¹  Zhichen Feng²  Yi Sun²  Xingjian Li²  Wei Sun³  Yudan Yuan⁴  Cezhou Zhao⁴ 

[1] Department of Chemistry, Xi’an Jiaotong-Liverpool University, Suzhou 215123, China;Department of Electrical and Electronic Engineering, Xi’an Jiaotong-Liverpool University, Suzhou 215123, China;GMCC Electronic Technology Wuxi Co. Ltd., Wuxi 214000, China;School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China;

关键词: hierarchical porous carbon;    paddy;    KHCO3;    dicyandiamide;    supercapacitors;   

DOI  :  10.3390/ma14020318

来源: DOAJ

【 摘 要 】

A facile and environmentally friendly fabrication is proposed to prepare nitrogen-doped hierarchical porous activated carbon via normal-pressure popping, one-pot activation and nitrogen-doping process. The method adopts paddy as carbon precursor, KHCO₃ and dicyandiamide as the safe activating agent and nitrogen dopant. The as-prepared activated carbon presents a large specific surface area of 3025 m²·g⁻¹ resulting from the synergistic effect of KHCO₃ and dicyandiamide. As an electrode material, it shows a maximum specific capacitance of 417 F·g⁻¹ at a current density of 1 A·g⁻¹ and very good rate performance. Furthermore, the assembled symmetric supercapacitor presents a large specific capacitance of 314.6 F·g⁻¹ and a high energy density of 15.7 Wh·Kg⁻¹ at 1 A·g⁻¹, maintaining 14.4 Wh·Kg⁻¹ even at 20 A·g⁻¹ with the energy density retention of 91.7%. This research demonstrates that nitrogen-doped hierarchical porous activated carbon derived from paddy has a significant potential for developing a high-performance renewable supercapacitor and provides a new route for economical and large-scale production in supercapacitor application.

【 授权许可】

Unknown