Scalable sonochemical synthesis of petal-like MnO2/graphene hierarchical composites for high-performance supercapacitors

Shengqiang Qiu, Ran Li, Zhiyong Huang, Zhenjia Huang, Chi Pong Tsui, Chengen He, Xiaoyan Han, Yingkui Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)

Abstract

The past decade has witnessed substantial achievements on electrochemical energy storage in employing graphene-based composites; however, of which have been usually produced on a laboratory scale with a limited compatibility with future industrialization. Herein a facile, cheap, and scalable sonochemical method was developed to prepare MnO2/graphene composite electrodes for supercapacitors. Petal-like MnO2 arrays were densely grown on the surface of graphene oxide followed by annealing at 220 °C under an air atmosphere. The as-fabricated MnO2/graphene hierarchical composite electrodes deliver 292.9 and 156.1 F/g at 5 and 100 mV/s, respectively, showing higher specific capacitance and better rate capability compared to the MnO2 electrode. An excellent cyclability with a capacitance retention as high as 91.5% was also achieved for the composite electrodes after running 1000 cycles. Such excellent electrochemical performances are ascribed to the robust composite structure and synergetic contribution from petal-like MnO2 arrays and conductive graphene sheets.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalComposites Part B: Engineering
Volume161
DOIs
Publication statusPublished - 15 Mar 2019

Keywords

  • Composites
  • Graphene
  • MnO
  • Sonochemistry
  • Supercapacitors

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this