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Titanium Containing γ‐MnO 2 (TM) Hollow Spheres: One‐Step Synthesis and Catalytic Activities in Li/Air Batteries and Oxidative Chemical Reactions
Author(s) -
Jin Lei,
Xu Linping,
Morein Christine,
Chen Chunhu,
Lai Monique,
Dharmarathna Saminda,
Dobley Arthur,
Suib Steven L.
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201001080
Subject(s) - materials science , anatase , rutile , titanium , catalysis , x ray photoelectron spectroscopy , chemical engineering , raman spectroscopy , adsorption , lithium (medication) , octahedron , inorganic chemistry , chemistry , organic chemistry , crystal structure , photocatalysis , metallurgy , medicine , physics , optics , engineering , endocrinology
Abstract Titanium containing γ‐MnO 2 octahedral molecular sieves having hollow sphere structures are successfully prepared for the first time using a one‐step synthesis method. Titanium cations are used as structure‐directing agents in the synthesis process. The assembly of the hollow spheres is carried out at the beginning of the process. Various techniques including XRD, N 2 adsorption, SEM, EDX, RAMAN, TEM, XPS, and TGA are employed for the materials characterization. Ti is incorporated into the MnO 2 framework in isolated sites, and TiO 2 phases (anatase and rutile) are not observed. When introduced in medium‐sized lithium‐air batteries, the materials give very high specific capacity (up to 2.3 A h g −1 ). These materials are also catalytically tested in the oxidation of toluene with molecular oxygen at atmospheric pressure, showing significant oxidative catalytic activities in this difficult chemical reaction.