Formation of electro-conductive titanium oxide fine particles by pulsed UV laser irradiation
Literature Information
Tsutomu Ioroi, Hiroyuki Kageyama, Tomoki Akita, Kazuaki Yasuda
Nano-submicron particles of sub-stoichiometric titanium oxide (TiOx) were synthesized by irradiation of TiO2 particles dispersed in liquid with a Nd:YAG pulsed UV laser, and their physicochemical and electrochemical properties were examined. After laser irradiation for 1 h, spherical oxide particles of up to ca. 300 nm in diameter were formed regardless of the liquid used, however the reduction of TiO2 largely depended on the liquid: acetonitrile most strongly promoted the reduction of TiO2 by UV laser irradiation. The mean valence of titanium in TiOx synthesized in acetonitrile was ca. 3.5, which is comparable to that of the most-reduced Magnéli phase, Ti4O7. While the electrical conductivity of as-washed TiOx was significantly low, annealing at 900 °C in hydrogen dramatically improved conductivity. The oxidation resistance of TiOx was examined by cyclic voltammetry to a high potential (1.5 V) using a MEA under PEMFC operating conditions. TiOx showed a much lower anodic corrosion current at >1.0 V than XC-72R carbon, which suggests that TiOx may exhibit superior oxidation resistance as a catalyst support material at high potentials.
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