Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.
J Am Chem Soc. 2011 Aug 24;133(33):12952-5. doi: 10.1021/ja204479j. Epub 2011 Aug 1.
Oxygen vacancy levels are monitored during the oxidation of CO by CeO(2-δ) nanorods and Au-CeO(2-δ) nanorods, nanocubes, and nanopolyhedra by using Raman scattering. The first-order CeO(2) F(2g) peak near 460 cm(-1) decreases when this reaction is fast (fast reduction and relatively slow reoxidation of the surface), because of the lattice expansion that occurs when Ce(3+) replaces Ce(4+) during oxygen vacancy creation. This shift correlates with reactivity for CO oxidation. Increases in the oxygen deficit δ as large as ~0.04 are measured relative to conditions when the ceria is not reduced.
通过拉曼散射监测 CeO(2-δ)纳米棒以及 Au-CeO(2-δ)纳米棒、纳米立方体和纳米多面体在氧化 CO 过程中的氧空位水平。当反应速度较快（表面快速还原和相对缓慢再氧化）时，位于 460 cm(-1) 附近的 CeO(2) F(2g)的一阶峰会减小，这是因为在氧空位形成过程中 Ce(3+)取代 Ce(4+)导致晶格膨胀。这种位移与 CO 氧化的反应性相关。与氧化铈未还原时的条件相比，氧缺陷 δ 的增加高达约 0.04。
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