Abstract
All-solid-state supercapacitors with high power density and working stability are high-efficiency energy storage devices for smart electronic equipment. Developing electrode materials with fast ions and electrons transport is critical to improving the energy storage capability. Here, we report carbon nanotubes/graphitic carbon nitride nanocomposites with large specific surface area, porous structure and high electrical conductivity toward high-performance supercapacitors. The large surface area with porosity provides reservoir for ion accommodation during charge-discharge processes, and the high conductivity facilitates electrons and ions transport. Furthermore, nitrogen sites in electrodes contribute significant pseudocapacitance for supercapacitors. The nanocomposites based device gives a high specific capacity of 148 F g −1 at current density of 1 A g −1 with good rate capability from 1 to 10 A g −1. Additionally, the device displays excellent working stability with capacitance retention of 93% even after 10000 cycles at 1 A g −1 under 0.8 V in air. This study sheds light on design of nanocomposites with highly efficient charge transfer and will accelerate development of next-generation solid state energy devices.
Original language | English |
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Pages (from-to) | 1714-1720 |
Number of pages | 7 |
Journal | Science China Technological Sciences |
Volume | 63 |
Issue number | 9 |
Early online date | 21 Jul 2020 |
DOIs | |
Publication status | Published - Sept 2020 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2020, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Funding
This work was supported by the Earth Engineering Center, and Center for Advanced Materials for Energy and Environment at Columbia University.
Keywords
- carbon nanotubes
- graphitic carbon nitride
- high capacity
- nanocomposite
- nitrogen doping
- supercapacitors