Tea-leaves based nitrogen-doped porous carbons for high-performance supercapacitors electrode

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• 作者：Guofu Ma ; Jindan Li ; Kanjun Sun ; Hui Peng…
• 关键词：Activated carbon ; Tea ; leaves ; Nitrogen ; doped ; Chemical activation ; Supercapacitor
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：21
• 期：2
• 页码：525-535
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Electrochemistry; Energy Storage; Characterization and Evaluation of Materials; Analytical Chemistry; Condensed Matter Physics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1433-0768
• 卷排序：21

文摘

Nitrogen-doped porous activated carbons have been fabricated through a simple and efficient carbonization method at 700 °C with the waste tea-leaves as carbon precursor and ZnCl₂ as activating agent. The average pore size and specific surface area are in the ranges of 2.3–6.6 nm and 10.3 ~ 1143.9 m2 g−1, with the ZnCl₂ to tea-leaves weight ratio from 0 to 3. As an electrode material for supercapacitors, the TPACs-2 (the ZnCl₂ to tea-leaves weight ratio is 2) which has 3.0 wt% nitrogen content, possesses a large specific capacitance of 296 F g−1 at 0.5 A g−1 and excellent rate capability (74 % retention at 10 A g−1) in 2 mol L−1 KOH. Furthermore, the symmetric supercapacitor fabricated with TPACs-2 electrodes delivers a high energy density of 13.5 Wh kg−1 at a power density of 221 W kg−1 and superior cycle stability (only 9 % loss after 5000 cycles), operating in the wide voltage range of 0–1.8 V in 0.5 mol L−1 Na₂SO₄ aqueous electrolyte. The results demonstrate TPACs-2 is a promising candidate for the electrode material of supercapacitors.