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Published on: December 20, 2016
Synthesis and charge storage properties of templated LaMnO3-SiO2 composite materials
Graham W Piburn1, J Tyler Mefford1, Nicholas Zinni1
1Department of Chemistry, the University of Texas at Austin, 6.336 Norman Hackerman Buliding, 100 E. 24th St. Stop A1590, Austin, TX 78712, USA. smh@cm.utexas.edu.
Abstract:
Mesoporous LaMnO3 with bulk surface areas in the range 225-300 m2 g-1 were prepared by direct overgrowth around the short-channel version of SBA-15 silica. The extent of LaMnO3 growth was found to be affected by the polarity of solvent system used to impregnate the SBA-15 with La3+ and Mn2+ precursors. The resulting LaMnO3-SiO2 composites were stable in refluxing NaOH, suggesting that the SiO2 was fully encapsulated. The composites were structurally characterized using a range of techniques including 2-D elemental mapping and Raman spectroscopy. The electrochemical behavior of the composites was tested for pseudocapacitance, which revealed normalized specific capacitances over 200 F g-1.
