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Hydrothermal Synthesis and Electrochemical Characteristics of Crystalline α-MnO2 Nanotubes

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Abstract:

MnO2 nanotubes with nanopore dimension were prepared using Hydrothermal method. Morphological analysis by FE-SEM showed well aligned nanotubes with an average pore size of 20 nm. Structural analysis by XRD showed crystalline body-centered tetragonal α-MnO2 phase. FT-IR spectrum showed the presence of α-MnO2 phase with an evidence for hydrated MnO2. Composition analysis by XPS also disclosed the presence of hydrated MnO2. From the XPS spectra analysis, the chemical state of Mn in MnO2 was found to be +3. The composite of α-MnO2/MWCNT on Ni foam current collector present fair electrochemical properties such as a specific capacitance of 360 F/g at 5 mVs–1 in 6 M KOH with excellent cycle stability and oxidation–reduction reaction (ORR) since CNT as conductive matrix provides electronic conduction path way and mechanical stability.

Keywords: CRYSTALLINE α-MNO2; ELECTROCHEMICAL STUDIES; NANOTUBE

Document Type: Review Article

DOI: http://dx.doi.org/10.1166/sam.2012.1348

Publication date: August 1, 2012

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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