Electrochemical properties of yolk-shell-structured CuO-Fe 2 O 3 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-Fe 2 O 3 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-Fe 2 O 3 systems increased from 5 to 16m 2 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 2 O 3 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-Fe 2 O 3 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-Fe 2 O 3 powder system are investigated. The unique structure of the yolk-shell CuO-Fe 2 O 3 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 Jan 1
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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