Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 20, Issue 19, Pages 3373-3382Publisher
WILEY-BLACKWELL
DOI: 10.1002/adfm.201001080
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Funding
- NSF GOALI [CBET 0827800]
- Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Sciences, Office of Science, US Department of Energy
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Titanium containing gamma-MnO2 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 MnO2 framework in isolated sites, and TiO2 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.
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