阳极
材料科学
碳纤维
电化学
吸附
兴奋剂
化学工程
电导率
硼
储能
纳米技术
电极
无机化学
化学
光电子学
有机化学
复合材料
复合数
物理化学
物理
工程类
量子力学
功率(物理)
作者
Liuqian Yang,Zhen Cao,Jian Yin,Chunyan Wang,Dandan Ouyang,Hui Zhu,Yanan Wang,Luigi Maria Cavallo,Husam N. Alshareef,Jiao Yin
出处
期刊:Small
[Wiley]
日期:2023-02-17
卷期号:19 (20)
被引量:4
标识
DOI:10.1002/smll.202300440
摘要
Abstract Nitrogen doping is an effective strategy to improve potassium ion storage of carbon electrodes via the creation of adsorption sites. However, various undesired defects are often uncontrollably generated during the doping process, limiting doping effect on capacity enhancement and deteriorating the electric conductivity. Herein, boron element is additionally introduced to construct 3D interconnected B, N co‐doped carbon nanosheets to remedy these adverse effects. This work demonstrates that boron incorporation preferentially converts pyrrolic N species into BN sites with lower adsorption energy barrier, further enhancing the capacity of B, N co‐doped carbon. Meanwhile, the electric conductivity is modulated via the conjugation effect between the electron‐rich N and electron‐deficient B, accelerating the charge‐transfer kinetics of potassium ions. The optimized samples deliver a high specific capacity, high rate capability, and long‐term cyclic stability (532.1 mAh g −1 at 0.05 A g −1 , 162.6 mAh g −1 at 2 A g −1 over 8000 cycles). Furthermore, hybrid capacitors using the B, N co‐doped carbon anode deliver a high energy and power density with excellent cycle life. This study demonstrates a promising approach using BN sites for adsorptive capacity and electric conductivity enhancement in carbon materials for electrochemical energy storage applications.
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