超级电容器
材料科学
石墨烯
碳纳米管
电极
电容
碳化
纳米技术
电导率
碳纤维
光电子学
化学工程
复合材料
复合数
扫描电子显微镜
化学
工程类
物理化学
作者
Yafeng Fan,Zonglin Yi,Ge Song,Zhe-Fan Wang,Chaojie Chen,Lingling Xie,Guohua Sun,Fangyuan Su,Cheng‐Meng Chen
出处
期刊:Carbon
[Elsevier]
日期:2021-11-01
卷期号:185: 630-640
被引量:24
标识
DOI:10.1016/j.carbon.2021.09.059
摘要
Carbon materials are considered as the ideal electrode materials for supercapacitors due to their diverse structure and nature. However, their poor frequency response is an obstacle to their application in high-frequency supercapacitors. Herein, an ultra-high temperature graphitization process at 2800 °C is proposed to fabricate carbon nanotubes/graphene hybrid films that are successfully employed as the electrode materials of high-frequency supercapacitors. By rational hybridization, the carbon nanotubes/graphene interlinked networks offer fast ion transport paths. Importantly, via a graphitization process at 2800 °C, the as-obtained hybrid films exhibit an ultrahigh in-plane conductivity of 491.81 S cm−1 and favorable out-plane conductivity of 27.98 mS cm−1. Such design brings the as-constructed high-frequency supercapacitors an unprecedented phase angle (up to −56.23°) and area capacitance (up to 230.56 μF cm−2) at 120 Hz, and their cut-off frequency can be nearly 30 times higher than that of films carbonization at 1600 °C. Such increases, further supported by density functional theory (DFT) calculations, are partly attributable to enhancements of ion response arising from the repair of edge defects of graphene. These findings will provide a new method in designing the structure of carbon electrodes for enhancing SCs frequency response performances.
科研通智能强力驱动
Strongly Powered by AbleSci AI