期刊
SCIENCE OF ADVANCED MATERIALS
卷 6, 期 12, 页码 2712-2723出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/sam.2014.1990
关键词
Manganese Oxide; Morphology and Phase Control; Growth Mechanism; Electrocatalysts; Oxygen Reduction Reaction
资金
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energy [20114030200060]
- Basic Science Research Program through the National Research Foundation (NRF) - Ministry of Education [2013R1A1A2012656]
- National Research Foundation of Korea [2013R1A1A2012656] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Morphology and phase of MnO2 nanostructure were successfully governed by controlling reaction time and temperature in a simple hydrothermal synthesis. delta-MnO2 nanoflowers were initially formed at a growth condition of 80 degrees C and 12 hr and were transformed into alpha-MnO2 nanorods with increasing reaction temperature and time through an intermediate stage where the nanoflowers became sea urchins like structure with delta-MnO2 core and alpha-MnO2 spikes coexisting before they completely formed into alpha-MnO2 nanorods. Longer reaction times and higher temperatures were favorable for the growth of alpha-MnO2 nanorods. The thickness of alpha-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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