材料科学
超级电容器
电容
电容感应
曲折
电极
碳纤维
化学气相沉积
碳纳米管
多孔性
导电体
纳米技术
储能
化学工程
复合材料
光电子学
电气工程
复合数
化学
物理
工程类
物理化学
功率(物理)
量子力学
作者
Bing Yan,Feng Li,Jiaojiao Zheng,Qian Zhang,Chunmei Zhang,Yichun Ding,Jingquan Han,Shaohua Jiang,Shuijian He
标识
DOI:10.1016/j.colsurfa.2023.131018
摘要
Structural and compositional optimization are considered as vital strategies to improve the capacitive properties of carbon-based electrodes. Inspired by the abundant vertically aligned micron-sized low-tortuosity porous channels of natural wood, a facile, low-energy, and efficient approach that anchors N/O-codoped carbon nanotubes on the inner and outer surfaces of carbonized wood matrix through in-situ chemical vapor deposition is proposed. The as-prepared thick carbon monoliths have unique three-dimensional hierarchically porous structures, interconnected conductive networks, and rich N/O-containing species, consequently endowing the electrodes with ultrahigh mass loading and inspiring capacitive properties. Representatively, the [email protected] electrode (∼56 mg cm−2) improves the specific capacitance to 6620.3 mF cm−2 (118.5 F g−1, 82.8 F cm−3) at 2 mA cm−2. And the robust electrode exhibits an outstanding cycle stability even after 20,000 charge/discharge cycles at 30 mA cm−2 (5.4% decay). Furthermore, the maximum specific capacitance and energy density of the assembled symmetric supercapacitor are 4120.0 mF cm−2 (51.5 F cm−3, 42.9 F g−1) and 0.6 mWh cm−2 (6.3 mWh cm−3, 6.0 Wh kg−1), respectively. The above strategies will open up a new path for the value-added utilization of renewable resources and the efficient preparation of low-cost and high-performance energy storage and conversion devices.
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