Comparison of the electrochemical properties of yolk–shell and dense structured CoFe2O4 powders prepared by a spray pyrolysis process†
Abstract
CoFe2O4 powders with yolk–shell and dense structures are both prepared by a simple spray pyrolysis process with the same preparation conditions. Sucrose dissolved in the spray solution changes the morphology from a dense structure into a yolk–shell structure. In the initial cycle, the yolk–shell CoFe2O4 powders exhibit discharge and charge capacities of 1158 and 902 mA h g−1 respectively, at a current density of 1 A g−1, while the dense CoFe2O4 powders exhibit capacities of 1071 and 677 mA h g−1, respectively. After 200 cycles, the capacity retentions of the yolk–shell and dense powders after the first cycles are 83 and 47%. The yolk–shell powders exhibit not only good cycling stability but also good rate performance compared with the dense powders because of their structural advantages.
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