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Mechanistic Study on Phase and Morphology Conversion of MnO2 Nanostructures Grown by Controlled Hydrothermal Synthesis

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Morphology and phase of MnO2 nanostructure were successfully governed by controlling reaction time and temperature in a simple hydrothermal synthesis. δ-mno2 nanoflowers were initially formed at a growth condition of 80 °C and 12 hr and were transformed into α-mno2 nanorods with increasing reaction temperature and time through an intermediate stage where the nanoflowers became sea urchins like structure with δ;-mno2 core and α-mno2 spikes coexisting before they completely formed into α-mno2 nanorods. longer reaction times and higher temperatures were favorable for the growth of α-mno2 nanorods. the thickness of α-mno2 nanorods increased with increasing reaction temperature and time. the crystalline phase and morphology conversion mechanism of mno2 nanostructures was proposed by examining the grown mno2 nanostructures with various analytic techniques such as xrd, sem, hrtem and tem analyses. electrochemical properties of the synthesized nanomaterials were also extracted for the application to lithium-air battery as cathode catalyst.
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Keywords: ELECTROCATALYSTS; GROWTH MECHANISM; MANGANESE OXIDE; MORPHOLOGY AND PHASE CONTROL; OXYGEN REDUCTION REACTION

Document Type: Research Article

Publication date: December 1, 2014

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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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