Understanding the charge storage mechanism to achieve high capacity and fast ion storage in sodium-ion capacitor anodes by using electrospun nitrogen-doped carbon fibers

Runyu Yan, Elinor Josef, Haijian Huang, Karen Leus, Markus Niederberger, Jan P. Hofmann, Ralf Walczak, Markus Antonietti, Martin Oschatz (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)
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Abstract

Microporous nitrogen‐rich carbon fibers (HAT‐CNFs) are produced by electrospinning a mixture of hexaazatriphenylene‐hexacarbonitrile (HAT‐CN) and polyvinylpyrrolidone and subsequent thermal condensation. Bonding motives, electronic structure, content of nitrogen heteroatoms, porosity, and degree of carbon stacking can be controlled by the condensation temperature due to the use of the HAT‐CN with predefined nitrogen binding motives. The HAT‐CNFs show remarkable reversible capacities (395 mAh g−1 at 0.1 A g−1) and rate capabilities (106 mAh g−1 at 10 A g−1) as an anode material for sodium storage, resulting from the abundant heteroatoms, enhanced electrical conductivity, and rapid charge carrier transport in the nanoporous structure of the 1D fibers. HAT‐CNFs also serve as a series of model compounds for the investigation of the contribution of sodium storage by intercalation and reversible binding on nitrogen sites at different rates. There is an increasing contribution of intercalation to the charge storage with increasing condensation temperature which becomes less active at high rates. A hybrid sodium‐ion capacitor full cell combining HAT‐CNF as the anode and salt‐templated porous carbon as the cathode provides remarkable performance in the voltage range of 0.5–4.0 V (95 Wh kg−1 at 0.19 kW kg−1 and 18 Wh kg−1 at 13 kW kg−1).
Original languageEnglish
Article number1902858
Number of pages13
JournalAdvanced Functional Materials
Volume29
Issue number26
Early online date26 Apr 2019
DOIs
Publication statusPublished - 27 Jun 2019

Keywords

  • carbon fibers
  • nitrogen-doped carbon
  • sodium storage mechanism
  • sodium-ion capacitors

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