Carbonized tubular polypyrrole with a high activity for the Br2/Br redox reaction in zinc-bromine flow batteries

M. C. Wu, T. S. Zhao, R. H. Zhang, L. Wei, H. R. Jiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)

Abstract

Zinc-bromine flow batteries have been regarded as one of the most promising technologies for large-scale energy storage. However, the widespread application of this technology is still hindered by its low power density, primarily resulting from a large polarization in the Br2/Br electrode. In this work, carbonized tubular polypyrrole with abundant nitrogen- and oxygen-containing functional groups is synthesized and, for the first time, applied to a zinc-bromine flow battery as a positive electrode material. Experimental results unravel that carbonized tubular polypyrrole exhibits a high activity toward the Br2/Br redox reaction, and enables the zinc-bromine flow battery to be operated at a current density of 80 mA cm−2 with a high energy efficiency of 76.0%. In contrast, the battery with the pristine graphite felt electrode can only output an energy efficiency of 69.4% at the same current density. In addition, no degradation is observed for the zinc-bromine flow battery equipped with carbonized tubular polypyrrole for 100 cycles. These superior results suggest that carbonized tubular polypyrrole is a promising positive electrode material for zinc-bromine flow batteries.

Original languageEnglish
Pages (from-to)569-576
Number of pages8
JournalElectrochimica Acta
Volume284
DOIs
Publication statusPublished - 10 Sep 2018
Externally publishedYes

Keywords

  • Br/Br redox reaction
  • Carbonized tubular polypyrrole
  • Energy storage
  • Zinc-bromine flow battery

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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