Charge- And Proton-Storage Capability of Naphthoquinone-Substituted Poly(allylamine) as Electrode-Active Material for Polymer-Air Secondary Batteries

Kouki Oka, Saki Murao, Kazuki Kobayashi, Hiroyuki Nishide, Kenichi Oyaizu

Research output: Contribution to journalArticlepeer-review

Abstract

1,4-Naphthoquinone (NQ) undergoes a two electron and two proton redox process in one step at a potential of -0.05 V (vs Ag/AgCl) in 0.05 M H2SO4 aqueous solution. Its heterogeneous electron transfer rate constant is comparable to those of electrochemically reversible redox-active molecules. Therefore, NQ is a potential electrode-active material candidate in acidic aqueous electrolyte. Simple nucleophilic substitution of 2-bromo-1,4-naphthoquinone and poly(allylamine) yields NQ-substituted poly(allylamine) (PNQ), enabling us to adjust the hydrophilicity of the redox polymer according to the NQ introduction rate. A polymer-air secondary battery composed of the PNQ anode, the Pt/C cathode, and 0.05 M H2SO4 aqueous electrolyte displayed high cyclability (>100 cycles) and C-rate capability (∼15 C) with a moderate voltage of 0.8 V during discharging.

Original languageEnglish
JournalACS Applied Energy Materials
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • naphthoquinone
  • organic battery
  • organic electrode
  • quinone
  • redox-active polymer

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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