Constructing Active BN Sites in Carbon Nanosheets for High‐Capacity and Fast Charging Toward Potassium Ion Storage

• DOI: 10.1002/smll.202300440
• Publication Date: 2023-02-18T17:21:11Z
• Authors: Liuqian Yang; Zhen Cao; Jian Yin; Chunyan Wang; Dandan Ouyang; Hui Zhu; Yanan Wang; Luigi Cavallo; Husam N. Alshareef; Jiao Yin
• Keywords: Carbon fibers

Nitrogen doping is an effective strategy to improve potassium ion storage of carbon electrodes via the creation adsorption sites. However, various undesired defects are often uncontrollably generated during process, limiting effect on capacity enhancement and deteriorating electric conductivity. Herein, boron element additionally introduced construct 3D interconnected B, N co-doped nanosheets remedy these adverse effects. This work demonstrates that incorporation preferentially converts pyrrolic species into BN sites with lower energy barrier, further enhancing carbon. Meanwhile, conductivity modulated conjugation between electron-rich electron-deficient accelerating charge-transfer kinetics ions. The optimized samples deliver a high specific capacity, rate capability, long-term cyclic stability (532.1 mAh g-1 at 0.05 A , 162.6 2 over 8000 cycles). Furthermore, hybrid capacitors using anode power density excellent cycle life. study promising approach for adsorptive in materials electrochemical applications.