Journal
ACS NANO
Volume 6, Issue 9, Pages 8067-8077Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn302654p
Keywords
microwave synthesis; nanostructured manganese oxide; morphological control; electrochemical catalyst; lithium-air batteries
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Funding
- U.S. Department of Energy, Office of Science of Basic Energy Sciences [DE-AC02-06CH11357]
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Single-crystal alpha-MnO2 nanotubes have been successfully synthesized by microwave-assisted hydrothermal of potassium permanganate in the presence of hydrochloric acid. The growth mechanism including the morphological and crystalline evolution has been carefully studied with time-dependent X-ray diffraction, electron microscopy, and controlled synthesis. The as-synthesized MnO2 nanostructures are incorporated in air cathodes of lithium-air batteries as electrocatalysts for the oxygen reduction and evolution reactions. The characterization reveals that the electrodes made of single-crystalline alpha-MnO2 nanotubes exhibit much better stability than those made of alpha-MnO2 nanowires and delta-MnO2 nanosheet-based microflowers in both charge and discharge processes.
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