We report the effect of metal–oxide interfaces on CO oxidation catalytic activity with inverse TiO₂-nanostructured Au catalysts. The inverse nanocatalysts were prepared by depositing TiO₂via the liquid-phase immersion method on electrochemically synthesized Au nanostructure supports. The catalytic performance for CO oxidation was investigated using various amounts of Ti (i.e. 0.1–1.0 wt%) on two different morphologies of Au nanostructures (i.e. nanoporous and nanorod). In comparing the different Au morphologies, we found an overall higher TOF and lower activation energy for the TiO₂/nanoporous Au than those for the TiO₂/nanorod Au. In addition, the CO oxidation activity increased as the Ti content increased up to 0.5 wt% probably due to active TiO₂–Au interface sites enhancing CO oxidation via the supply of adsorption sites or charge transfer from TiO₂ to Au. However, a higher titania content (i.e. 1.0 wt% TiO₂) resulted in decreased activity caused by high surface coverage of TiO₂ decreasing the number of TiO₂–Au interface sites. These results implied that the perimeter area of the metal–oxide interface played a significant role in determining the catalytic performance for CO oxidation.

中文翻译：

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TiO ₂ /纳米结构的Au逆催化剂的金属氧化物周边提高了CO氧化的催化活性†

我们报告了金属氧化物界面对TiO ₂反向纳米结构Au催化剂对CO氧化催化活性的影响。反相纳米催化剂是通过液相浸渍法在电化学合成的金纳米结构载体上沉积TiO ₂制备的。研究了在两种不同形态的金纳米结构（即纳米孔和纳米棒）上使用各种量的Ti（即0.1-1.0 wt％）来研究CO氧化的催化性能。通过比较不同的Au形态，我们发现TiO ₂ /纳米多孔Au的总TOF和活化能均低于TiO ₂/ nanorod Au。另外，随着Ti含量增加到0.5 wt％，CO氧化活性增加，这可能是由于活性TiO ₂ -Au界面位点通过提供吸附位点或电荷从TiO ₂转移到Au增强了CO氧化作用。然而，更高的二氧化钛含量（即1.0重量％的TiO ₂）导致引起的TiO高的表面覆盖率的活性降低₂减少的二氧化钛的数量₂ -Au界面部位。这些结果表明，金属-氧化物界面的周边区域在决定CO氧化的催化性能方面起着重要作用。