Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 29, Pages 12805-12817Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp103705q
Keywords
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Funding
- National Natural Science Foundation of China [20973096, 20673060]
- National Basic Research Program of China [2009CB623502]
- MOE Supporting Program for New Century Excellent Talents [NCET-06-0215]
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Three distinct Co3O4 nanostructures of nanoparticles, nanocubes, and hierarchical pompon-like microspheres were prepared through facile solution routes. These materials were characterized by XRD, SEM and FESEM, and nitrogen adsorption, and their formation mechanisms were briefly discussed. Their electrochemical behaviors as electrode reactants for lithium ion batteries were evaluated by cyclic voltammograms, electrochemical impedance spectroscopy, and static charge-discharge cycles. Among the three, pompon-like microspheres exhibit the best electrochemistry, revealed by the perfect combination of high discharge capacities and excellent cycling retention. A direct comparison of electrochemical behaviors between these three nanostructures reflects interesting nanostructure effect, which is reasonably discussed in terms of how particle sizes, nanostructures, and crystallinity of Co3O4 materials function in tuning their electrochemistry. Observations from this research are expected to extend to other transition metal oxides being extensively investigated, and provide valuable guidance for producing practically reliable electrodes based on a series of convertible metal oxides in the future.
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