Acta Chimica Sinica ›› 2023, Vol. 81 ›› Issue (4): 319-327.DOI: 10.6023/A22120494 Previous Articles     Next Articles



蒋江民a,b, 郑欣冉a, 孟雅婷a, 贺文杰d, 陈亚鑫a, 庄全超a, 袁加仁c,*(), 鞠治成a,*(), 张校刚b,*()   

  1. a 中国矿业大学 材料与物理学院 徐州 221116
    b 南京航空航天大学 材料科学与技术学院 南京 211106
    c 南昌大学 物理与材料学院 南昌 330038
    d 河南理工大学 材料科学与工程学院 焦作 454003
  • 投稿日期:2022-12-12 发布日期:2023-03-28
  • 基金资助:
    国家自然科学基金(22209204); 国家自然科学基金(22279162); 国家自然科学基金(21975283); 江苏省自然科学基金(BK20221140); 中国博士后科学基金(2022M713364)

Research on the Preparation and Potassium Storage Performance of F, N Co-doped Porous Carbon Nanosheets

Jiangmin Jianga,b, Xinran Zhenga, Yating Menga, Wenjie Hed, Yaxin Chena, Quanchao Zhuanga, Jiaren Yuanc,*(), Zhicheng Jua,*(), Xiaogang Zhangb,*()   

  1. a School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China
    b School of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
    c School of Physics and Materials, Nanchang University, Nanchang 330038, China
    d School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
  • Received:2022-12-12 Published:2023-03-28
  • Contact: * E-mail:;;
  • Supported by:
    National Natural Science Foundation of China(22209204); National Natural Science Foundation of China(22279162); National Natural Science Foundation of China(21975283); Natural Science Foundation of Jiangsu Province(BK20221140); China Postdoctoral Science Foundation(2022M713364)

Potassium-ion capacitor (PIC) is a new type of electrochemical energy storage device, and carbon-based materials are considered as one of the most promising candidate anode materials for K+ storage. However, the migration rate of K+ is slow and the material structure is easy to be damaged during the intercalation and de-intercalation processes because the K+ has a larger radius, resulting in a significant decline in performance. Therefore, the development of low-cost carbon materials to meet the thermodynamic and kinetic requirements of K+ diffusion has become the bottleneck of current development. In this work, the F and N co-doped porous carbon nanosheets (FNCPC) were prepared by direct high-temperature carbonization, in which the low-cost coal pitch as the carbon source, polytetrafluoroethylene as the fluorine source and sodium chloride as the template agent. The structure design of the nanosheet effectively shortens the transport path of ions, and the co-doping of F and N widens the layer spacing of carbon, alleviates the volume expansion problem, and also forms more surface defects, which provides more reactive sites for K+ storage. In addition, electrochemical kinetic analysis and density functional theory (DFT) show that the FNCPC has remarkable pseudocapacitance characteristics and strong K adsorption energy. Benefiting from the synergistic optimization of structure and chemical properties, the FNCPC anode exhibits excellent potassium storage capacity (a high specific capacity of 212.8 mAh•g-1 at 2 A•g-1) and good cyclic stability. Furthermore, the PIC (AC//FNCPC) was constructed by using commercial activated carbon (AC) as cathode electrode and FNCPC as anode electrode, which delivers a maximum energy density of 87.5 Wh•kg-1, and has a capacity retention rate of 86.1% after 3000 cycles, showing a very broad application prospect.

Key words: potassium-ion capacitor, carbon nanosheet, coal tar pitch, fluorine nitrogen co-doping, adsorption energy