Journal
DIAMOND AND RELATED MATERIALS
Volume 109, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2020.108044
Keywords
Carbons; Cross-cut; Bamboo tunnels; High performance supercapacitors
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Funding
- National Natural Science Foundation of China [11875209, 11705029]
- National Key Research and Development Program of China [2019YFA0210003]
- Fundamental Research Funds for the Central Universities
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The advantages of carbon-based supercapacitors are high specific power and long life, but their specific energy is low. It is difficult to increase the specific energy and specific power of carbon-based supercapacitors simultaneously. In this work, bamboos are cross-cut into thin flakes, which are carbonized and KOH-treated to obtain porous carbons for supercapacitors. The specific capacitance, specific energy and the rate performance of the carbons from cross-cutting bamboo are significantly improved. More interestingly, the symmetric supercapacitor in 1 M Na2SO4 electrolyte based on cross-cutting bamboo carbons provide a high specific energy of 10.4 Wh kg(-1) in 0.47 s at a relatively high specific power of 80,000 W kg(-1), and no capacitance loss is found after 30,000 cycles at 50 A g(-1). These features are explained for the improvement of the effective specific surface area and the shortened ion diffusion distance in carbon electrode due to cross-cutting of the long natural pore tunnels of bamboo and the enhancement of hydrophilicity of carbon surface. The results reveal that such a simple strategy of cross-cutting biomass is an efficient way to prepare promising porous carbons for supercapacitors with good performance.
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