Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-29T01:59:40.370Z Has data issue: false hasContentIssue false
  • English
  • Français

The Influence of Surface Termination and Domain Structure on the Photochemical Reactivity of SrTiO3 and BaTiO3

Published online by Cambridge University Press:  02 July 2020

Jennifer L. Giocondi  and
Gregory S. Rohrer
Jennifer L. Giocondi
Affiliation:
Department of Materials Science and Engineering Carnegie Mellon University, Pittsburgh, PA, 15213
Gregory S. Rohrer
Affiliation:
Department of Materials Science and Engineering Carnegie Mellon University, Pittsburgh, PA, 15213
Get access

Abstract

The crystallographic orientation and atomic termination layer of oxide catalysts are known to influence their reactivity. The objective of this work was to measure how the relative photochemical reactivities of two ternary titanates vary with surface orientation and composition. The surface structure property relationships derived from these observations can be used to define optimized photocatalyst microstructures.

To measure the relative reactivity of surfaces with different orientations, crystallites (∽ 20 μm in diameter) in a polycrystalline ceramic were examined individually. First, polycrystalline specimens of BaTiO3 and SrTiO3 were synthesized using conventional ceramic processing. Surfaces for analysis were prepared by polishing and thermal etching in air. The surface orientations of selected grains in the sample were then determined from backscattered electron diffraction patterns recorded in a scanning electron microscope. to make a local measurement of the photochemical activity of each grain, we used a well established probe reaction (the reduction of aqueous Ag+ to Ag0) that deposits metallic silver on the surface as a reaction product.

Type
Characterization of Catalysts (Organized by S. Bradley)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1062 - 1063
Copyright
Copyright © Microscopy Society of America 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

references

1)Morris Hotsenpiller, P.A., et al., J. Phys. Chem. B, 102 (1998) 3216.CrossRefGoogle Scholar
2)Hu, Y.H., Chan, H.M., Wen, Z.X., Harmer, M.P., J. Am. Ceram. Soc. 69 (1986) 594.CrossRefGoogle Scholar
3)Giocondi, J.L. and Rohrer, G.S., Chem. of Mater. 13 (2001) 241.CrossRefGoogle Scholar
4) Supported by the National Science Foundation under grant DMR 0072151.Google Scholar