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Hierarchical porous carbon foam supported on carbon cloth as high-performance anodes for aqueous supercapacitors

  • Zhang, Jie
  • Li, Wenli
  • Shifa, Tofik Ahmed
  • Sun, Jiangbo
  • Jia, Chuqiao
  • Zhao, Yumin
  • Cui, Yanbin
Publication Date
Nov 01, 2019
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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Carbon anodes have been widely utilized for the fabrication of high-performance asymmetric supercapacitors. However, they generally suffer from unsatisfactory energy density due to low specific capacitance arising from inferior conductivity and insufficient ionic diffusion rate. Here a surface modification method is conducted after the annealing of ZIF-67 precursor to produce hydrophilic, porous and heteroatom-doped carbon foam. On top of enhanced area capacitance, widened voltage window of -1.3-0V (vs saturated calomel electrode) can be achieved through electrochemical reduction to suppress the hydrogen evolution reaction. The optimized reduced porous carbon foam on carbon cloth exhibits a maximum area capacitance of 1049 mF/cm(2) at an applied current density of 12 mA/cm(2) with excellent capacitance retention of 98.4% after 6000 charge-discharge cycles at 15 mA/cm(2). By well pairing with hierarchical MnO2/CC cathode, a 2.3 V asymmetric supercapacitor in neutral aqueous Na2SO4 electrolyte is assembled, which delivers an exceptional energy density of up to 10.07 mWh/cm(3). The procedure in this paper for carbonaceous material to simultaneously achieve considerable capacitance and enlarged voltage window can open up a wider prospect toward design of anodes for high-performance aqueous supercapacitor.

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