title: Morphological and crystalline evolution of nanostructured MnO2 and its application in lithium--air batteries.
abstract: Single-crystal α-MnO(2) 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 MnO(2) 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-MnO(2) nanotubes exhibit much better stability than those made of α-MnO(2) nanowires and δ-MnO(2) nanosheet-based microflowers in both charge and discharge processes.
authors.affiliation: Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Tu T
authors.initials: TT
authors.lastname: Truong
authors.forename: Yuzi
authors.initials: Y
authors.lastname: Liu
authors.forename: Yang
authors.initials: Y
authors.lastname: Ren
authors.forename: Lynn
authors.initials: L
authors.lastname: Trahey
authors.forename: Yugang
authors.initials: Y
authors.lastname: Sun
mesh_terms: D000388:Air; D003460:Crystallization / Q000379:methods*; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008094:Lithium / Q000737:chemistry* / Q000302:isolation & purification; D017895:Manganese Compounds / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D008094:Lithium