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Electrochemical Properties of Yolk-Shell-Structured CuO-Fe2O3 Powders with Various Cu/Fe Molar Ratios Prepared by One-Pot Spray Pyrolysis.
- Source :
- ChemSusChem; Dec2013, Vol. 6 Issue 12, p2299-2303, 5p
- Publication Year :
- 2013
-
Abstract
- Several yolk-shell-structured CuO-Fe<subscript>2</subscript>O<subscript>3</subscript> 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<subscript>2</subscript>O<subscript>3</subscript> systems increased from 5 to 16 m<superscript>2</superscript> g<superscript>−1</superscript> 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<subscript>2</subscript>O<subscript>3</subscript> system (Cu/Fe=1:2), showing maximum values at a constant current density of 1000 mA g<superscript>−1</superscript>, are 1436 and 1012 mA h g<superscript>−1</superscript>, respectively. After 130 cycles, the discharge capacities of the yolk-shell CuO-Fe<subscript>2</subscript>O<subscript>3</subscript> powders with Cu/Fe molar ratios of 1:3, 1:2, 1:1, 2:1, and 3:1 are 1159, 1151, 755, 655, and 651 mA h g<superscript>−1</superscript>, respectively. The discharge capacities of the yolk-shell and dense powder samples after 50 cycles, when subjected to a series of current density increases from 500 to 5000 mA g<superscript>−1</superscript>, are 735 and 495 mA h g<superscript>−1</superscript>, respectively. [ABSTRACT FROM AUTHOR]
- Subjects :
- PYROLYSIS
CHEMICAL reactions
CHEMICAL energy
CHEMICAL processes
COMMON-ion effect
Subjects
Details
- Language :
- English
- ISSN :
- 18645631
- Volume :
- 6
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 92776429
- Full Text :
- https://doi.org/10.1002/cssc.201300535