Phosphorus Regulated Cobalt Oxide@Nitrogen-Doped Carbon Nanowires for Flexible Quasi-Solid-State Supercapacitors

Shude Liu, Ying Yin, Yang Shen, Kwan San Hui, Young Tea Chun, Jong Min Kim, Kwun Nam Hui, Lipeng Zhang, Seong Chan Jun

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Abstract

Battery-type materials are promising candidates for achieving high specific capacity for supercapacitors. However, their slow reaction kinetics hinders the improvement in electrochemical performance. Herein, a hybrid structure of P-doped Co3 O4 (P-Co3 O4 ) ultrafine nanoparticles in situ encapsulated into P, N co-doped carbon (P, N-C) nanowires by a pyrolysis-oxidation-phosphorization of 1D metal-organic frameworks derived from Co-layered double hydroxide as self-template and reactant is reported. This hybrid structure prevents active material agglomeration and maintains a 1D oriented arrangement, which exhibits a large accessible surface area and hierarchically porous feature, enabling sufficient permeation and transfer of electrolyte ions. Theoretical calculations demonstrate that the P dopants in P-Co3 O4 @P, N-C could reduce the adsorption energy of OH- and regulate the electrical properties. Accordingly, the P-Co3 O4 @P, N-C delivers a high specific capacity of 669 mC cm-2 at 1 mA cm-2 and an ultralong cycle life with only 4.8% loss over 5000 cycles at 30 mA cm-2 . During the fabrication of P-Co3 O4 @P, N-C, Co@P, N-C is simultaneously developed, which can be integrated with P-Co3 O4 @P, N-C for the assembly of asymmetric supercapacitors. These devices achieve a high energy density of 47.6 W h kg-1 at 750 W kg-1 and impressive flexibility, exhibiting a great potential in practical applications.

Original languageEnglish
Article numbere1906458
JournalSmall
Volume16
Issue number4
Early online date1 Jan 2020
DOIs
Publication statusPublished - 28 Jan 2020

Keywords

  • CO3O4
  • EFFICIENT
  • EVOLUTION
  • GRAPHENE OXIDE
  • HIGH-ENERGY
  • HYBRID SUPERCAPACITOR
  • NANOTUBE ARRAYS
  • NI FOAM
  • OXYGEN REDUCTION
  • PERFORMANCE
  • anion regulation
  • encapsulated hybrids
  • flexible quasi-solid-state supercapacitors
  • in situ structural reconstruction
  • orientated metal organic frameworks

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