High performance flexible supercapacitors based on porous wood carbon slices derived from Chinese fir wood scraps
| Autor: | Cui Zhou, Wu Chenling, Xianjun Li, Deng Yuanyuan, Peng Quan, Wu Wei, Zhaowei Xi, Wang Xin, Zhang Sen, Yongfeng Luo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Materials science Renewable Energy Sustainability and the Environment Carbonization Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Energy storage 0104 chemical sciences chemistry Specific surface area Electrode Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material 0210 nano-technology Porosity Carbon |
| Zdroj: | Journal of Power Sources. 424:1-7 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2019.03.100 |
| Popis: | Wood carbon slices derived from wood scraps for constructing energy storage electrodes are very important, because they have excellent characteristics, such as structural stability, long cycle life, abundant resources and low prices. However, they have low capacitance as electrode materials for supercapacitors. In this paper, we design a new concept to obtain a porous wood carbon electrode with a large specific surface area. Firstly, CO2 is used to activate carbonized wood to open some closed pores and create some new pores. The activated wood is then soaked into KOH solution to further create new pores. Finally, the carbonized wood is modified with HNO3. After the above treatments, the number of nanopores with a diameter of approximately 2 nm is greatly increased within the wood carbon slices, and their specific surface area is increased to 703.5 m2 g−1. The single electrode material shows excellent performance with a high specific capacitance of 285.6 F g−1 and a high energy density of 38.0 mWh cm−3, which has more than twice the capacitance of the supercapacitor based on biomass carbon materials modified by diluted HNO3. Therefore, the application of wood scraps can meet the basic energy storage needs and realize the waste into treasure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect