超级电容器
假电容
电容
杂原子
材料科学
碳化
水溶液
电容器
化学工程
球磨机
碳纤维
纳米技术
活动层
储能
电极
复合材料
图层(电子)
化学
有机化学
复合数
电气工程
薄膜晶体管
物理
扫描电子显微镜
物理化学
工程类
电压
量子力学
功率(物理)
戒指(化学)
作者
Yue Dong,Xiao Dong,Dezhao Zhu,Yanxiang Yang,Chen Luo,Yang Li,Jinshan Li
出处
期刊:Nano select
[Wiley]
日期:2023-02-06
卷期号:4 (5): 316-323
被引量:1
标识
DOI:10.1002/nano.202300002
摘要
Abstract Supercapacitors have been used in a broad range of fields including electronics, transportation, and energies. Electrode materials with high capacitance and good rate performance are crucial for the future development and application of supercapacitors. Herein, we prepared N, O co‐doped defective carbon blocks (NO‐DCBs) with abundant active sites through carbonization and ball‐milling of polyimide. The as‐obtained NO‐DCBs exhibit high atomic content of N and O inherited from polyamic acid (PAA) precursor, as well as large amounts of intrinsic defects introduced by ball‐milling. Benefiting from the synergy of pseudocapacitance and electrical double‐layer capacitance provided by heteroatoms and intrinsic defects respectively, the NO‐DCBs assembled symmetric aqueous capacitor shows high capacitance of 329 F g −1 at 0.1 A g −1 , good rate performance of 48% capacitance retention at 50 A g −1 , and superb cycling stability. This work promotes the deep understanding of the synergy effect of functional groups and intrinsic defects for capacitive energy storage, and broadens the avenue for structural design of active sites in carbon materials.
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