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3D boron/nitrogen dual doped layered carbon for 2 V aqueous symmetric supercapacitors

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  • Wei, Feng
  • Lv, Yaohui
  • Zhang, Shouquan
  • Zheng, Jiandong

Abstract

The operating voltage for supercapacitors (SCs) in alkaline electrolyte was limited by the splitting of water. Therefore, it is still a huge challenge to obtain high energy density by improving the operating voltage for aqueous symmetric SCs. Herein, a novel strategy is developed to construct the 3D boron/nitrogen dual doped layered carbon (BNLC) by using the in-situ potassium tetraborate activation from biomass. The synergetic effects of B/N heteroatoms and 3D layered structures enhance the electron transport property, and achieve the high voltage window of 2 V for SCs in 3 M Zn(CF3SO3)2 aqueous electrolyte. As a result, the BNLC presents high specific capacitance of 315.3 F g−1 at 0.05 A g−1, good rate performance of 241.1 F g−1 at 40 A g−1 and excellent cycle stability with 98.4% of initial capacitance after 20,000 cycles. In addition, the energy density of BNLC-based SC in neutral electrolyte (43.8 Wh kg−1) is 4.4 times as high as that of BNLC-based SC in alkaline electrolyte (9.9 Wh kg−1). This work pioneers an efficient strategy for the use of the synergetic effects of heteroatoms and neutral electrolyte to enhance the energy density of energy storage devices.

Suggested Citation

  • Wei, Feng & Lv, Yaohui & Zhang, Shouquan & Zheng, Jiandong, 2021. "3D boron/nitrogen dual doped layered carbon for 2 V aqueous symmetric supercapacitors," Renewable Energy, Elsevier, vol. 180(C), pages 683-690.
    • Handle: RePEc:eee:renene:v:180:y:2021:i:c:p:683-690
    DOI: 10.1016/j.renene.2021.08.103
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    References listed on IDEAS

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    1. Zhao, Liqing & Wei, Qinghe & Zhang, Lili & Zhao, Yafei & Zhang, Bing, 2021. "NiCo alloy decorated on porous N-doped carbon derived from ZnCo-ZIF as highly efficient and magnetically recyclable catalyst for hydrogen evolution from ammonia borane," Renewable Energy, Elsevier, vol. 173(C), pages 273-282.
    2. Tianyu Liu & Zhengping Zhou & Yichen Guo & Dong Guo & Guoliang Liu, 2019. "Block copolymer derived uniform mesopores enable ultrafast electron and ion transport at high mass loadings," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
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