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Title: Effect of niobium segregation on surface properties of titanium dioxide
Authors: Sheppard, LR
Atanacio, AJ
Bak, T
Nowotny, J
Prince, KE
Keywords: Niobium
Photochemical reactions
Issue Date: 8-Sep-2006
Publisher: Society of Photo-Optical Instrumentation Engineers (SPIE)
Citation: Sheppard, L. R., Atanacio, A., Bak, T., Nowotny, J., & Prince, K. E. (2006, September). Effect of niobium segregation on surface properties of titanium dioxide. In Solar Hydrogen and Nanotechnology (Vol. 6340, p. 634015). International Society for Optics and Photonics. doi:10.1117/12.674547
Abstract: The present paper considers the effect of segregation on the performance of photo-electrode materials for photo-electrochemical water splitting. This phenomenon, which alters the surface composition of a material during processing at elevated temperatures, has the capacity to dominate interfacial charge transfer between the photo-electrode and the electrolyte. As the present understanding of segregation in metal oxides is limited, this paper aims at addressing the need to collect empirical data which can be used for the development of novel materials. In the present investigation, Nb surface segregation was investigated at 1273 K under high and low oxygen activity using secondary ion mass spectrometry (SIMS). A calibration procedure was used to enable quantifiable data and Nb was observed to segregate strongly, especially at high oxygen activity. While this was attributed to the defect disorder, it remained unclear whether gas/solid equilibrium was achieved, and consequently whether the observed behaviour represents equilibrium segregation. Irrespectively, the observed behaviour clearly illustrates how the surface composition of a metal oxide can be altered through the control of segregation. This must be considered in the pursuit of high performance photo-electrode materials for water splitting under sunlight. © (2006) Society of Photo-Optical Instrumentation Engineers (SPIE).
ISBN: 9780819464194
Appears in Collections:Conference Publications

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