• Core–shell-structured MnO2@carbon spheres and nitrogen-doped activated carbon for asymmetric supercapacitors with enhanced energy density

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    • Keywords

       

      MnO2; hydrothermal method; nitrogen-doped activated carbon; asymmetric supercapacitor

    • Abstract

       

      Asymmetric supercapacitors have potential applications in renewable-energy technology owing to their remarkable electrochemical properties. A high-voltage asymmetric supercapacitor was developed based on a core–shell-structured MnO2@carbon sphere composite (MnO2@CS) as the cathode, nitrogendopedactivated carbon as the anode and a neutral aqueous Na2SO4 solution as the electrolyte. MnO2@CS was successfully fabricated by hydrothermally growing MnO2 on the surface of carbon spheres. A nitrogencontaining benzoxazine resin was adopted as a precursor to produce in situ nitrogen-doped activated carbon.Such an aqueous electrolyte-based asymmetric supercapacitor can be cycled reversibly in the high-voltage region of 0–1.9 V and exhibits a superior energy density of 8 Wh kg-1 at an ultrahigh power density of 9627 W kg-1 owing to the matching of MnO2@CS and porous nitrogen-doped activated carbon. Moreover,the asymmetric supercapacitor presents acceptable cycling performance, with 74.4% retention after 1000 cycles at 1 A g-1, and a charge–discharge efficiency of the electrode of almost 100%.

    • Author Affiliations

       

      JIE WEN1 XIAOPING CHEN1 MAOLIN HUANG1 WEN YANG2 JIE DENG3

      1. College of Chemistry and Chemical Engineering, Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu 610500, Sichuan, China
      2. Department of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
      3. College of Pharmacy and Biological Engineering, Chengdu University, Chengdu 610106, China
    • Dates

       
  • Journal of Chemical Sciences | News

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