Abstract
Macroporous Fe3O4/carbon composite and core-shell Fe3O4@carbon composite microspheres have been prepared by means of one-pot spray pyrolysis. The addition of polystyrene (PS) nanobeads to a spray solution containing an iron salt and poly(vinylpyrrolidone) (PVP) led to macroporous Fe3O4/carbon composite microspheres, the carbon and iron components of which are uniformly distributed over the entire composite microsphere. The pore-size distribution curve for the macroporous Fe3O4/carbon composite shows distinct peaks at around 10 and 80 nm. An electrode prepared from the macroporous Fe3O 4/carbon composite microspheres showed better cycling and rate performances than an electrode formed from core-shell Fe3O 4@carbon composite microspheres. The initial discharge and charge capacities of the macroporous Fe3O4/carbon composite microsphere electrode were determined to be 1258 and 908 mA h g-1 at 2 A g-1, respectively, and the corresponding initial coulombic efficiency was 72 %. The composite microsphere electrode cycled 500 times at 5 A g-1 showed a high discharge capacity of 733 mA h g-1.
Original language | English |
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Pages (from-to) | 11078-11083 |
Number of pages | 6 |
Journal | Chemistry - A European Journal |
Volume | 20 |
Issue number | 35 |
DOIs | |
Publication status | Published - 2014 Aug 25 |
Externally published | Yes |
Keywords
- batteries
- energy storage
- iron
- nanostructures
- porous materials
- spray pyrolysis
ASJC Scopus subject areas
- Catalysis
- Organic Chemistry