期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 11, 页码 10474-10482出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b02481
关键词
Dead pine needle; One-step carbonization; O, N codoped; Activated carbon; High rate performance; Supercapacitor
资金
- projects in forestry public benefit research sector [201404610]
Dead pine needle derived O, N codoped activated carbons were prepared by an easy one-step carbonization without adding any chemical reagents. The as-obtained PN-X samples had a high rate performance as electrodes for supercapacitors. It was due to the unique structure of cells in dead pine needles, abundant contents of metal elements (K, Na, Ca, Mg) and a large number of heteroatom contents (O, N). The role of different metal atoms and air for the formation of pores, and the mechanism of one-step carbonization were proposed. Micro/Meso/Macropores are beneficial to ion adsorption and transportation, and the doping O and N can improve physical and chemical properties of the carbon surface and increase electrochemical active sites to generate additional pseudocapacitance. All chemical and physical properties of PN-X samples were provided in detail. Especially, the PN-1000 showed a high specific capacitance of 223 F g(-1) (178 F cm(-3)) at 0.5 A g(-1) while it still had 150 Fg(-1) (120 F cm(-3)) even at 100 A g(-1). The results suggested the unique PN-1000 to be a promising electrode material for supercapacitors in many practical applications.
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