Supercapacitive properties of hydrothermally synthesized Co 3O4 nanostructures

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DOIResolve DOI: http://doi.org/10.1021/jp2049684
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TypeArticle
Journal titleThe Journal of Physical Chemistry C
ISSN1932-7447
Volume115
Issue35
Pages1759917605; # of pages: 7
SubjectDifferent scale; High volume fraction; Hydrothermal process; Hydrothermally synthesized; Interconnected arrays; Mass loadings; Mesoporous; SEM and TEM; Specific capacitance; Synthesis temperatures; Electrochemical properties; Microstructure; Nanostructures
AbstractA hydrothermal process was employed to create a variety of Co 3O4 nanostructures. We demonstrate that nominally minor differences in the synthesis temperature (50, 70°, or 90 °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 Co3O 4 nanostructures that were synthesized at 50 °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. © 2011 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21272036
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Record identifierb8191008-634b-4018-8903-53667d131166
Record created2014-05-22
Record modified2017-03-23
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