Morphological and Crystalline Evolution of Nanostructured MnO2 and Its Application in Lithium–Air Batteries
journal contributionposted on 25.09.2012 by Tu T. Truong, Yuzi Liu, Yang Ren, Lynn Trahey, Yugang Sun
Any type of content formally published in an academic journal, usually following a peer-review process.
Single-crystal α-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 α-MnO2 nanotubes exhibit much better stability than those made of α-MnO2 nanowires and δ-MnO2 nanosheet-based microflowers in both charge and discharge processes.