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J Nanosci Nanotechnol. 2009 Feb;9(2):1281-6.

Preparation and characterization of Pd-Ti electrocatalyst on carbon supports for oxygen reduction.

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Texas Materials Institute and Center for Materials Chemistry, The University of Texas at Austin, Austin, TX 78712, USA.


Nanoscale bimetallic Pd-Ti catalysts on carbon supports were prepared in liquid using ammonium tetrachloropalladate and titanium isopropoxide. The size of the metal particles ranged from subnanometer to greater than 10 nm, and the X-ray diffraction pattern of metal particles was dominated by a cubic crystalline structure. Depending upon the preparation conditions, the catalysts were comprised of Pd and TiO2 or Pd3Ti-like alloy. The surface Ti/Pd ratio was much greater than the original metal loading. We propose that the bimetallic particles were comprised of short-range Pd and TiO2 or Pd-Ti alloy nanocrystal covered by a thin TiO2 layer.


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