Self-assembled spongy-like MnO2 electrode materials for supercapacitors
Abstract
Mesoporous spongy-like MnO2 has been synthesized via a facile and biphasic wet method, accompanied with tetraoctylammonium bromide (TOAB) as a soft template under ambient condition. A well-defined spongy morphology of MnO2 with uniform filament diameters 10-20 nm have been observed by FESEM, TEM, HRTEM, XRD, FT-IR,TGA-DSC studies. Further physical characterizations revealed that MnO2 sponges owned a large surface area of 155 m2 g-1 with typical mesoporous appearance. A specific capacitance value as high as 336 F g-1 was obtained. This improved capacitive behavior was attributed to the large surface area, morphology nature of nano-MnO2, and its broad pore size distribution.
- Publication:
-
Physica E Low-Dimensional Systems and Nanostructures
- Pub Date:
- August 2012
- DOI:
- 10.1016/j.physe.2012.07.013
- Bibcode:
- 2012PhyE...45..103D