Electrochemical properties of WO3-reduced graphene oxide composite powders prepared by one-pot spray pyrolysis process

Jong Min Won, Mun Yeong Son, Ji Hun Seo, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

In this work, we report the preparation of WO3-reduced graphene oxide (rGO) composite powders by spray pyrolysis process using a stable graphene oxide colloidal solution with ammonium tungstate. The ultrafine WO3nanocrystals below 10 nm in size are dispersed within the rGO matrix. The bare WO3powders prepared from the aqueous spray solution of ammonium tungstate are spherical and do not aggregate. The bare WO3and WO3-rGO composite powders show monoclinic and cubic crystal structures, respectively. The initial discharge capacities of the bare WO3and WO3-rGO composite powders at a current density of 100 mA g−1are 771 and 941 mA h g−1, respectively, and their initial Coulombic efficiencies are 67 and 65%, respectively. The discharge capacities of the bare WO3and WO3-rGO composite powders at the 300thcycle are 282 and 546 mA h g−1, respectively.

Original languageEnglish
Pages (from-to)647-653
Number of pages7
JournalJournal of Alloys and Compounds
Volume688
DOIs
Publication statusPublished - 2016

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) ( NRF-2015R1A2A1A15056049 ). This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) , granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea ( 201320200000420 and 20153030091450 ).

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

  • Anode material
  • Lithium secondary battery
  • Reduced graphene oxide
  • Spray pyrolysis
  • Tungsten oxide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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