Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 112, Issue 1-3, Pages 627-631Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2007.08.042
Keywords
mesoporous manganese dioxide; lyotropic liquid crystalline phases; supercapacitors
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Mesoporous manganese dioxide (MnO2) films have been successfully electrodeposited from hexagonal structured lyotropic liquid crystalline phases with polyoxyethnlene surfactant. The liquid crystalline templates are characterized by low-angle X-ray diffraction (XRD) and polarized-light optical microscopy (POM). The mesoporous MMO2 films are characterized by low-angle XRD, wide-angle XRD, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mesoporous MnO2 films heat-treated at 200 degrees C were characterized by cyclic voltammetry (CV) in 0.5 M Na2SO4 electrolyte for supercapacitor application. The mesoporous MnO2 films exhibit ideal capacitive behavior between -0.1 and 0.9 V, and a specific capacitance of 460 Fg(-1) is obtained at the scan rate of 10 mV s(-1). These results indicate that mesoporous MnO2 films electrodeposited from lyotropic liquid crystalline phases provide promising applications in supercapacitors. (C) 2007 Elsevier Inc. All rights reserved.
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