Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 18, Pages 17041-17047Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.09.116
Keywords
Visible light photocatalysis; Oxides; Chemical synthesis; Catalytic properties; X-ray diffraction; Microstructure
Categories
Funding
- Indian Institute of Technology Patna
- DST-SERB, Government of India [SB/FTP/ETA-0160/2014]
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The nanoparticles involving LaxCe1-xO2-delta system (x = 0.1, 0.2 and 0.5) with various rare earth La3+ doping levels were successfully synthesized and characterized for their structural, catalytic and photocatalytic properties. The structural characterizations (via X-ray diffraction, high-resolution transmission electron microscopy, Raman spectroscopy) confirmed the presence of phase-pure catalyst nanoparticles with desired target stoichiometry; induced lattice strains were correlated with various doping amounts. Raman spectroscopy results illustrated the effect of progressively higher La-doping with increasing peak asymmetry, broadening and shifting of the key peaks to lower energies. The 10% La-doped ceria catalysts depicted superior catalytic reduction and visible light photocatalytic (for the degradation of methylene blue) properties along with promising oxygen storage capacity values. Our results suggest that low (<= 20%) doping of the rare-earth metal is sufficient for maintaining a balance between catalytic properties and overall deformation (strain, vacancy etc) in the fluorite CeO2 lattice.
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