Effects of grain morphology, microstructure and dispersed metal cocatalyst on the photoreduction of water over impurity-doped LaInO₃

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• 作者：P. Dhanasekaran ; N.M. Gupta ; ^{nm.gupta@ncl.res.in}
• 关键词：A. Semiconductors ; A. Interfaces ; B. Chemical synthesis ; C. Electron microscopy ; D. Catalytic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：May, 2012
• 卷：47
• 期：5
• 页码：1217-1228
• 文件大小：1638 K

摘要

The single phase lanthanum indates doped with Ga (for La) and N (for O), i.e. La_1鈭?em>xGa_xInO₃ (0 鈮?#xA0;x 鈮?#xA0;0.2) and LaInO_1鈭?em>yN_y (y 鈭?#xA0;0.6), exhibit significant activity for photoreduction of water; the yield of H₂ produced depending on dopant, excitation source, and addition of a sacrificial reagent. The two-step H₂ evolution observed for this reaction corresponds with the two distinct absorbance regimes displayed by these materials, one in UV-region due to bandgap excitation and the other in visible region arising from the transitions involving sub-bandgap donor or acceptor energy states. The photocatalytic activity of these d¹⁰ metal oxides increases on coating with a metal/metal oxide co-catalyst, gold exhibiting superior activity to Pt and NiO, irrespective of excitation source and sample composition. The preparation-controlled particle morphology, doping-induced lattice imperfections, and metal/semiconductor hetero-junctions are envisaged to play a key role in the absorption characteristics and photocatalytic water reduction activity of metal/LaInO₃ nanocomposites.