Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA.
J Am Chem Soc. 2010 Mar 10;132(9):2858-9. doi: 10.1021/ja909987j.
The interaction of O(2) with gold foil and gold nanoparticles grown by thermal deposition on TiO(2)(110) was studied by in situ ambient pressure X-ray photoelectron spectroscopy at room temperature. No spontaneous dissociation of O(2) was observed either on Au foil or on Au nanoparticles up to 1 Torr of O(2). X-ray irradiation, however, is very effective in promoting gold oxidation on both surfaces in the presence of O(2). Our results help reconcile recent conflicting experimental observations regarding the activation of molecular oxygen, which is a crucial issue in Au catalyzed oxidation reactions.
采用原位常压 X 射线光电子能谱技术，在室温条件下研究了 O(2)与金箔和通过热沉积在 TiO(2)(110)上生长的金纳米粒子之间的相互作用。在高达 1 托的 O(2)下，无论是在金箔上还是在金纳米粒子上，均未观察到 O(2)的自发离解。然而，在存在 O(2)的情况下，X 射线辐照在两种表面上均非常有效地促进了金的氧化。我们的研究结果有助于调和关于分子氧活化的最近的相互矛盾的实验观察，这在 Au 催化氧化反应中是一个关键问题。
