Mean Inner Potential of Nanostructured Noble Metal Catalysts - Pt/TiO 2 Catalyst -
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Mean Inner Potential of Nanostructured Noble Metal Catalysts - Pt/TiO2 Catalyst S. Ichikawa, T. Akita, K. Okazaki, M. Okumura*, K. Tanaka, and M. Kohyama National Institute of Advanced Industrial Science and Technology (AIST-Kansai), 1-8-31 Midorigaoka, Ikeda, OSAKA, 563-8577, Japan *School of Science, Osaka University, *1-1 Machikaneyama, Toyonaka, OSAKA, 560-0043, Japan ABSTRACT Catalytic properties of noble metal catalysts are often caused by their nanostructures. Gold catalysts are typical cases. It is especially interesting that the catalytic property of gold suddenly changes to resemble that of platinum when the mean size of gold dispersed on certain oxides is 5nm, the mean inner potential is the same as the reported values of bulk gold (experimental: 21-23V, calculated: 25-30V). When the size is 30V, and it begins to increase suddenly >40V at the size 1.5nm, the mean inner potential of platinum is the same as that of the bulk (~25V). In case of the particle with the size
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