title: Synthesis of Porous δ-MnO2 Submicron Tubes as Highly Efficient Electrocatalyst for Rechargeable Li-O2 Batteries.
abstract: Lithium-oxygen (Li-O2 ) batteries are receiving intense interest because of their high energy density. A new tubular δ-MnO2 material prepared by a simple hydrothermal synthesis is an efficient electrocatalyst for Li-O2 batteries. The synthesized δ-MnO2 exhibits a unique tubular structure, in which the porous walls are composed of highly dispersed ultrathin δ-MnO2 nanosheets. Such a unique structure and its intrinsic catalytic activity provide the right electrocatalyst characteristics for high-performance Li-O2 batteries. As a consequence, suppressed overpotentials-especially the oxygen evolution reaction overpotential-superior rate capability, and desirable cycle life are achieved with these submicron δ-MnO2 tubes as the electrocatalyst. Remarkably, the discharge product Li2 O2 of the Li-O2 battery exhibits a uniform nanosheet-like morphology, which indicates the critical role of the δ-MnO2 in the electrochemical process, and a mechanism is proposed to analyze the catalysis of δ-MnO2 .
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000 (P.R. China).|University of Chinese Academy of Sciences, Beijing 100049 (P.R. China).
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000 (P.R. China).|University of Chinese Academy of Sciences, Beijing 100049 (P.R. China).
authors.forename: Dongfei
authors.initials: D
authors.lastname: Sun
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000 (P.R. China).|University of Chinese Academy of Sciences, Beijing 100049 (P.R. China).
authors.forename: Mu
authors.initials: M
authors.lastname: He
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000 (P.R. China).
authors.forename: Junwei
authors.initials: J
authors.lastname: Lang
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000 (P. R. China).
authors.forename: Shan
authors.initials: S
authors.lastname: Xu
authors.affiliation: Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000 (P.R. China). xbyan@licp.cas.cn.
authors.forename: Xingbin
authors.initials: X
authors.lastname: Yan
mesh_terms: D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D060326:Chemistry Techniques, Synthetic; D011211:Electric Power Supplies; D004563:Electrochemistry; D008094:Lithium / Q000737:chemistry*; D017895:Manganese Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010087:Oxides / Q000138:chemical synthesis* / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D016062:Porosity
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D002244:Carbon; D008094:Lithium; D010100:Oxygen
keywords: electrochemistry; energy conversion; lithium; manganese; reaction mechanisms