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Enabling High-Volumetric-Energy-Density Supercapacitors: Designing Open, Low-Tortuosity Heteroatoms-Doped Porous Carbon-Tube Bundles Electrode

Abstract

In our work, we successfully design boron (B) and nitrogen (N) co-doped porous carbon tube bundles (B/N-PCTBs) electrode materials which are directly derived from the biomass of dandelion fluff. The low-tortuosity, open and porous structures contribute to electron transport along the tube wall and unimpeded ion diffusion inside the carbon tubes. The incorporation heteroatoms into PCTBs can bring extra pseudocapacitance and double layer capacitance to enhance the overall capacitance. Benefiting from hollow and open microstructure and heteroatoms doping, the optimized B/N-PCTBs electrode (active materials: 2.6 mg cm-2) possesses an impressive specific capacitance of 355 F g-1 at 1 A g-1. Even with an ultrahigh loading mass of 40 mg cm-2, the electrode still has a relatively high specific capacity of 216 F g-1 at 1 A g-1. The assembled symmetric cell with an active material loading of 80 mg cm-2 (cathode: 40 mg cm-2; anode: 40 mg cm-2) shows a superior volumetric energy density of 12.15 Wh L-1 at the power density of 699.84 W L-1. The facile yet high-performance porous carbon tube bundle is a promising material which can be applied in many other fields such as lithium ion batteries, hydrogen evolution reaction, and heavy metal ions adsorption.

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Publication details

The article was received on 09 Aug 2017, accepted on 01 Oct 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07010A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Enabling High-Volumetric-Energy-Density Supercapacitors: Designing Open, Low-Tortuosity Heteroatoms-Doped Porous Carbon-Tube Bundles Electrode

    J. Zhao, Y. Li, G. Wang, T. Wei, Z. Liu, K. Cheng, K. Ye, K. Zhu, D. Cao and Z. Fan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07010A

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