Journal
SURFACE & COATINGS TECHNOLOGY
Volume 202, Issue 4-7, Pages 1277-1281Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2007.07.083
Keywords
manganese oxide; electrophoretic deposition; cyclic voltammetry; X-ray absorption spectroscopy; supercapacitor
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Nanocrystalline manganese oxide powders were prepared by spray pyrolysis (SP) from manganese acetate solution at 400 degrees C. The as-obtained powders were subsequently coated onto graphite substrates via an electrophoretic deposition technique (EPD). The as-prepared powders were examined by transmission electron microscopy (TEM), X-ray diffractometry (XRD), synchrotron X-ray absorption spectroscopy (XAS); the coatings were further examined by cycling voltammetry (CV). Experimental results showed that manganese oxide powders prepared at 400 degrees C were hollow spherical particles with fractured shells and possessed high surface area. CV examination showed that the as-deposited coatings also exhibited the highest specific capacitance of 275 F/g. After hundreds of CV cycles, the specific capacitance decreased to 234 F/g, which was still comparable to values reported in the literature. Structural investigation by TEM and XRD revealed that the as-deposited coatings exhibited Mn3O4 phase with amorphous-like structure. While synchrotron XAS results showed that the manganese had a valence of +2.67, it was transited into tetravalent manganese after cyclic voltammetry. (C) 2007 Elsevier B.V. All rights reserved.
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