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Research Article

The high value utilization of CO2 to synthesize sulfur doped carbon nano-fibers with excellent capacitive performance

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  • Received: 16 April 2020Revised: 16 June 2020Accepted: 18 June 2020Available online: 21 June 2020
  • Carbon nanofiber, CNF, is regarded to be a promising material due to its excellent physical and chemical properties. Herein, a novel way to transform CO2 into heteroatom-doped CNFs is proposed, with the introduction of Fe, Co and Ni as catalyst. When electrolyte contained NiO, Co2O3 and Fe2O3 is employed, sulfur doped CNFs in various diameter are obtained. With the introduction of catalyst Fe, the obtained sulfur doped CNFs show the smallest and tightest diameter distribution. The obtained sulfur doped CNFs have high gravimetric capacitance (achieved by SDG-Fe) which could reach 348.5 F/g at 0.5 A/g, excellent cycling stability, and good rate performance. For comparison purposes, both stainless steel and nickel cathode were tested, where the active metal atom at their surface could act as catalyst. In these two situations, sulfur doped graphite sheet and sulfur doped graphite quasi-sphere were the main products, respectively.
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The high value utilization of CO2 to synthesize sulfur doped carbon nano-fibers with excellent capacitive performance

  • Corresponding authors:

    Li-wen Hu    E-mail: lwh0423@cqu.edu.cn

    Jian-bang Ge    E-mail: Jianbangge@vt.edu

  • 1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
  • 2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University, Chongqing 400044, China
  • 3. Nuclear Engineering Program, Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA

Abstract: Carbon nanofiber, CNF, is regarded to be a promising material due to its excellent physical and chemical properties. Herein, a novel way to transform CO2 into heteroatom-doped CNFs is proposed, with the introduction of Fe, Co and Ni as catalyst. When electrolyte contained NiO, Co2O3 and Fe2O3 is employed, sulfur doped CNFs in various diameter are obtained. With the introduction of catalyst Fe, the obtained sulfur doped CNFs show the smallest and tightest diameter distribution. The obtained sulfur doped CNFs have high gravimetric capacitance (achieved by SDG-Fe) which could reach 348.5 F/g at 0.5 A/g, excellent cycling stability, and good rate performance. For comparison purposes, both stainless steel and nickel cathode were tested, where the active metal atom at their surface could act as catalyst. In these two situations, sulfur doped graphite sheet and sulfur doped graphite quasi-sphere were the main products, respectively.

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