Electrochemical properties of yolk-shell-structured CuO-Fe 2O3 powders with various Cu/Fe molar ratios prepared by one-pot spray pyrolysis

Kwang Min Yang, Young Jun Hong, Yun Chan Kang

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Several yolk-shell-structured CuO-Fe2O3 powders with various Cu/Fe molar ratios have been successfully prepared under equivalent reaction conditions using a one-pot spray pyrolysis process. The Cu and Fe components are uniformly distributed throughout the powders, irrespective of composition. The Brunauer-Emmett-Teller surface areas of the yolk-shell CuO-Fe2O3 systems increased from 5 to 16m2 g-1 if the Cu/Fe molar ratios are decreased from 3:1 to 1:3. The initial discharge and charge capacities of the yolk-shell CuO-Fe 2O3 system (Cu/Fe=1:2), showing maximum values at a constant current density of 1000mA g-1, are 1436 and 1012mA h g -1, respectively. After 130cycles, the discharge capacities of the yolk-shell CuO-Fe2O3 powders with Cu/Fe molar ratios of 1:3, 1:2, 1:1, 2:1, and 3:1 are 1159, 1151, 755, 655, and 651mA h g -1, respectively. The discharge capacities of the yolk-shell and dense powder samples after 50cycles, when subjected to a series of current density increases from 500 to 5000mA g-1, are 735 and 495mA h g -1, respectively. Yolksfest! The effects of composition on the electrochemical properties of a yolk-shell-structured CuO-Fe2O 3 powder system are investigated. The unique structure of the yolk-shell CuO-Fe2O3 powders results in improved mechanical stability over repeated lithium ion insertion and extraction processes, and in improved rate performance and cycling properties at high current densities.

Original languageEnglish
Pages (from-to)2299-2303
Number of pages5
JournalChemSusChem
Volume6
Issue number12
DOIs
Publication statusPublished - 2013 Dec
Externally publishedYes

Keywords

  • batteries
  • electrodes
  • nanostructures
  • spray pyrolysis
  • yolk-shell powders

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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