Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 21, Issue 2, Pages 525-535Publisher
SPRINGER
DOI: 10.1007/s10008-016-3389-y
Keywords
Activated carbon; Tea-leaves; Nitrogen-doped; Chemical activation; Supercapacitor
Categories
Funding
- National Science Foundation of China [51462032]
- program for Changjiang Scholars and Innovative Research Team in University [IRT15R56]
- China Postdoctoral Science Foundation [2013 M540778]
- Key Laboratory of Eco-Environment-Related Polymer Materials (Northwest Normal University) of Ministry of Education
- Key Laboratory of Polymer Materials of Gansu Province
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Nitrogen-doped porous activated carbons have been fabricated through a simple and efficient carbonization method at 700 A degrees 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 similar to 1143.9 m(2) 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.
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