Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 35, Pages 17599-17605Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp2049684
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Funding
- NINT NRC
- NSERC
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A hydrothermal process was employed to create a variety of Co3O4 nanostructures. We demonstrate that nominally minor differences in the synthesis temperature (50, 70 degrees, or 90 degrees C) yield profound variations in the oxide microstructure, with lath-like, necklace-like and net-like morphologies of different scales resulting. This in turn resulted in significant variations in the supercapacitive performance that ranged from mediocre to superb. Specifically, the mesoporous net-like Co3O4 nanostructures that were synthesized at 50 degrees C exhibited very favorable electrochemical properties: The net-like Co3O4 had a specific capacitance of 1090 F/g at a mass loading of 1.4 mg/cm(2). At this high mass loading, such performance has not been previously reported. SEM and TEM analysis of these samples revealed an interconnected array of sub-10 nm crystallites interspersed with a high volume fraction of similar scale pores. The poorer performing microstructures were both coarser and much less porous.
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