Preparation and characterization of Pd-Ti electrocatalyst on carbon supports for oxygen reduction.
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.
Sun
Y M
YM
Texas Materials Institute and Center for Materials Chemistry, The University of Texas at Austin, Austin, TX 78712, USA.
Alpuche-Aviles
M
M
Bard
A J
AJ
Zhou
J P
JP
White
J M
JM