Heteroatoms in situ-doped hierarchical porous hollow-activated carbons for high-performance supercapacitor


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.

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This work was financially sponsored by the Fund for Shanxi “1331 Project” Key Subjects Construction (1331KSC), Program for the (Reserved) Discipline Leaders of Taiyuan Institute of Technology (2017), the Scientific Research Start-up Funds provided by Taiyuan Institute of Technology and the National Natural Science Foundation Item (21576277).

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Yan, R., Wang, K., Tian, X. et al. Heteroatoms in situ-doped hierarchical porous hollow-activated carbons for high-performance supercapacitor. Carbon Lett. 30, 331–344 (2020). https://doi.org/10.1007/s42823-019-00102-3

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  • Hierarchical porous hollow-activated carbons
  • Setaria viridis
  • Supercapacitor
  • Energy storage
  • High energy density