Flexible free-standing Na4Mn9O18/reduced graphene oxide composite film as a cathode for sodium rechargeable hybrid aqueous battery

Guanghui Yuan, Jiming Xiang, Huafeng Jin, Yanzi Jin, Lizhou Wu, Yongguang Zhang, Almagul Mentbayeva, Zhumabay Bakenov

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A novel free-standing Na4Mn9O18/reduced graphene oxide (NMO-RGO) composite was successfully prepared by a facile vacuum filtration technique. Scanning and transmission electron microscopy studies revealed formation of a film with needle-like Na4Mn9O18 homogeneously distributed and anchored on the RGO matrix. A sodium rechargeable hybrid aqueous battery with this novel cathode and zinc anode was first investigated and reported. The NMO-RGO film delivered a reversible discharge capacity of about 83 mAh g−1 when cycled galvanostatically at a current density of 0.1 A g−1, which was for about 78% higher than that of Na4Mn9O18 prepared by a slurry casting technique. This significant enhancement of electrochemical properties of NMO-RGO was due to the presence of graphene sheets in this free-standing composite cathode. These sheets form an agile substrate with a high conductivity to guarantee a successive electronic conduction channels in the electrode. In the same time, such composition and structure enables accommodation of the volume changes of Na4Mn9O18 during sodium insertion-extraction.

Original languageEnglish
Pages (from-to)647-654
Number of pages8
JournalElectrochimica Acta
Volume259
DOIs
Publication statusPublished - Jan 1 2018

Keywords

  • Cathode material
  • Composite film
  • Free-standing electrode
  • NaMnO/reduced graphene oxide
  • Rechargeable hybrid aqueous battery

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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