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Boron "gluing" nitrogen heteroatoms in a prepolymerized ionic liquid-based carbon scaffold for durable supercapacitive activity

Miao, Ling ; Duan, Hui ; Zhu, Dazhang ; Lv, Yaokang ; Gan, Lihua ; Li, Liangchun ; Liu, Mingxian

Journal of materials chemistry. A, Materials for energy and sustainability, 2021-02, Vol.9 (5), p.2714-2724 [Periódico revisado por pares]

Cambridge: Royal Society of Chemistry

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  • Título:
    Boron "gluing" nitrogen heteroatoms in a prepolymerized ionic liquid-based carbon scaffold for durable supercapacitive activity
  • Autor: Miao, Ling ; Duan, Hui ; Zhu, Dazhang ; Lv, Yaokang ; Gan, Lihua ; Li, Liangchun ; Liu, Mingxian
  • Assuntos: Boron ; Capacitance ; Carbon ; Crosslinking ; Durability ; Electrolytes ; Electron transfer ; Energy limitation ; Energy output ; Gluing ; Ionic liquids ; Nitrogen ; Scaffolds ; Service life ; Sulfuric acid ; Supercapacitors
  • É parte de: Journal of materials chemistry. A, Materials for energy and sustainability, 2021-02, Vol.9 (5), p.2714-2724
  • Notas: Electronic supplementary information (ESI) available. See DOI
    10.1039/d0ta09985f
  • Descrição: The incorporation of heterogeneous active sites into the carbon scaffold offers great potential to break the energy limitation in state-of-the-art supercapacitors, but rich heteroatomic motifs essentially thwart the scaffold firmness, leading to poor power/cycling durability under wide operational voltages/temperatures. Herein, a high-crosslinking prepolymerized ionic liquid p [ABA- co -MA][PA] network is designed to initially trap volatile heterogeneous segments during annealing, and gives the final N/B/O-doped porous carbon scaffolds (CPILs) with rich electroactive sites and pre-supposed structural superiorities. B-doped sites on the scaffold are bridged to glue/fix more electroactive N (4.21-9.05 at%) compared with the solely N-doped sample (2.87 at%), and the high binding energy of the consequent B-C bonds further consolidates the porous carbon scaffold for durable ion/electron transfer. As a result, the highly electroactive CPIL surface with 2629 m 2 g −1 surface area and 23.13 at% electroactive N/B/O enables a large specific capacitance (359 F g −1 @ 0.5 A g −1 ) and slight capacitance fade (19% @ 20 A g −1 ) in H 2 SO 4 electrolyte, as well as maximized electrode capacitance up to 211 F g −1 at 3.5 V in EMIM-BF 4 owing to the strong electrosorption ability of the electrolyte ions. Moreover, the CPIL-loaded symmetric supercapacitor in TMA-BF 4 /EMIM-BF 4 electrolyte yields a high energy output of 116 W h kg −1 @ 400 W kg −1 under a high potential of 4 V, durable service life (98.2% retention after 10 000 cycles) and wide temperature applicability from −3.5 to 82 °C. This work highlights the comprehensive improvement of multi-heteroatom doping in supercapacitive activity and durability, which provides an appealing strategy to enrich various applications. Doped boron atoms are bridged to glue more electroactive nitrogen sites on the carbon surface, and the high binding energy of the consequent B-C bonds further consolidates the porous carbon scaffold for durable ion/electron transfer.
  • Editor: Cambridge: Royal Society of Chemistry
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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