Heteroatoms in situ‑doped hierarchical porous hollow‑activated carbons for high‑performance supercapacitor
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 30권 / 3호
ㆍ저자명 : Rui Yan, Kai Wang, Xiaodong Tian, Xiao Li, Tao Yang, Xiaotong Xu, Yiting He, Shiwen Lei, Yan Song
ㆍ저자명 : Rui Yan, Kai Wang, Xiaodong Tian, Xiao Li, Tao Yang, Xiaotong Xu, Yiting He, Shiwen Lei, Yan Song
목차
Abstract1 Introduction
2 Experiments
2.1 Preparation of HPHACs
2.2 Characterization of HPHACs samples
2.3 Electrochemical measurements
3 Results and discussion
4 Conclusions
Acknowledgements
References
영어 초록
Heteroatoms in situ-doped hierarchical porous hollow-activated carbons (HPHACs) have been prepared innovatively by pyrolyzation of setaria viridis combined with alkaline activation for the first time. The micro-morphology, pore structure, chemical compositions, and electrochemical properties are researched in detail. The obtained HPHACs are served as outstanding electrode materials in electrochemical energy storage ascribe to the particular hierarchical porous and hollow structure, and the precursor setaria viridis is advantage of eco-friendly as well as cost-effective. Electrochemical measurement results of the HPHACs electrodes exhibit not only high specific capacitance of 350 F g−1 at 0.2 A g−1, and impressive surface specific capacitance (Cs) of 49.9 μF cm−2, but also substantial rate capability of 68% retention (238 F g−1 at 10 A g−1) and good cycle stability with 99% retention over 5000 cycles at 5 A g−1 in 6 M KOH. Besides, the symmetrical supercapacitor device based on the HPHACs electrodes exhibits excellent energy density of 49.5 Wh kg−1 at power density of 175 W kg−1, but still maintains favorable energy density of 32.0 Wh kg−1 at current density of 1 A g−1 in 1-ethy-3-methylimidazolium tetrafluoroborate ( EMIMBF4) ionic liquid electrolyte, and the excellent cycle stability behaviour shows the nearly 97% ratio capacitance retention of the initial capacitance after 10,000 cycles at current density of 2 A g−1. Overall, the results indicate that HPHACs derived from setaria viridis have appealing electrochemical performances thus are promising electrode materials for supercapacitor devices and large-scale applications.참고 자료
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