期刊
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
卷 12, 期 12, 页码 12084-12097出版社
ESG
DOI: 10.20964/2017.12.400
关键词
Porous carbon; Nitrogen self-doping; Electrode material; Supercapacitor; Cycle stability
资金
- National Natural Science Foundations of China [21706048, U1632151]
- China Postdoctoral Science Foundation [2016M590565]
- Fundamental Research Fund for the Central Universities [JZ2016HGTA0683]
- Startup Foundation of Hefei University of Technology [JZ2015HGBZ0530, XC2016JZBZ06]
Nitrogen self-doped porous carbon materials with large surface area and excellent cycle stability are successfully synthesized from the waste of Pteroceltis tatarinowii Maxim (PTM) bark for the first time. During the synthesis procedure, ethanol is introduced to ensure a homogeneous mixture and good contact of the precarbonized PTM bark with the activating agent (KOH or ZnCl2), resulting in a unique porous structure. The obtained KOH activated carbon (K-AC) possesses a hierarchical porous structure with a high specific surface area of 1721 m(2) g(-1) and small amount of nitrogen (0.3 wt%). Interestingly, ZnCl2-activated carbon (Zn-AC) shows a micropore structure with a narrow pore size distribution (0.5-2.0 nm) and a higher nitrogen content of 3.0 wt%. The electrochemical measurement results demonstrate that the as-prepared Zn-AC exhibits a high specific capacitance of 206 F g(-1) at a current density of 0.5 A g(-1), good rate performance and excellent cycle stability with capacitance retention of 99% over 10,000 cycles. In contrast, K-AC retains only approximately 89% of the initial capacitance value after 10,000 cycles. Thus, such waste PTM bark-derived carbon material, obtained by the ZnCl2 activated method, is a promising candidate material as an electrode for highly stable supercapacitors.
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