Details

Autor(en) / Beteiligte

• Wang, Huatao
• Zhang, Li
• Tan, Xuehai
• Holt, Chris M.B
• Zahiri, Beniamin
• Olsen, Brian C
• Mitlin, David

Titel

Supercapacitive Properties of Hydrothermally Synthesized Co3O4 Nanostructures

Ist Teil von

• Journal of physical chemistry. C, 2011-09, Vol.115 (35), p.17599-17605

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A hydrothermal process was employed to create a variety of Co3O4 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 Co3O4 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/cm2. 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.