超级电容器
材料科学
电容
比表面积
化学工程
兴奋剂
电化学
纳米技术
磷酸
碳纤维
功率密度
碳化
多孔性
热液循环
电极
复合材料
光电子学
功率(物理)
扫描电子显微镜
催化作用
复合数
有机化学
物理化学
量子力学
工程类
化学
冶金
物理
作者
Xipeng Xin,Na Song,Ruiming Jia,Bingnan Wang,Hongzhou Dong,Shuai Ma,Lina Sui,Yingjie Chen,Qian Zhang,Lifeng Dong,Liyan Yu
标识
DOI:10.1016/j.jmst.2021.02.014
摘要
In this work, a facile “carbonization-activation” strategy is developed to synthesize N, P-codoped hierarchical porous carbon. Phosphoric acid is innovatively introduced during the hydrothermal process to achieve in-situ P doping as well as create abundant pores, and the employment of sodamide is of vital importance to simultaneously serve as activating agent and N-source to succeed a high-level N doping. Thus, the obtained samples exhibit a unique three-dimensional hierarchical structure with an ultra-high specific surface area (3646 m2 g−1) and ultra-high N-doping level (9.81 at.%). Computational analyses confirm that N, P co-doping and higher N content can enhance active sites and widen potential differences of carbon materials to improve their capacitance. The as-prepared carbon materials demonstrate superior electrochemical performances, such as an ultra-high capacitance of 586 F g−1 at 1 A g−1, a superior rate capability of 409 F g−1 at 20 A g−1, and excellent long-term stability of 97 % capacitance retention after 10,000 cycles in 6 M KOH. Moreover, an assembled symmetric supercapacitor delivers a high energy density of 28.1 Wh kg−1 at the power density of 450 W kg−1 in 1 M Na2SO4, demonstrating a great potential for applications in supercapacitors.
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