We investigated CO oxidation behavior of doped cerium oxide fibers. Electrospinning technique was used to fabricate the inorganic fibers after burning off polymer component at 600 °C in air. Cu, Ni, Co, Mn, Fe, and La were doped at 10 and 30 mol% by dissolving metal salts into the polymeric electrospinning solution. 10 mol% Cu-doped ceria fiber showed excellent catalytic activity for low temperature CO oxidation with 50% CO conversion at just 52 °C. This 10 mol% Cu-doped sample showed unexpected regeneration behavior under simple ambient air annealing at 400 °C. From the CO oxidation behavior of the 12 samples, we conclude that absolute oxygen vacancy concentration estimated by Raman spectroscopy is not a good indicator for low temperature CO oxidation catalysts unless extra care is taken such that the Raman signal reflects oxide surface status. The experimental trend over the six dopants showed limited agreement with theoretically calculated oxygen vacancy formation energy in the literature.

中文翻译：

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掺杂氧化铈电纺纤维的低温 CO 氧化。


我们研究了掺杂氧化铈纤维的 CO 氧化行为。在空气中 600 ℃ 下烧掉聚合物成分后，采用静电纺丝技术制造无机纤维。通过将金属盐溶解到聚合物静电纺丝溶液中，以 10 mol% 和 30 mol% 掺杂 Cu、Ni、Co、Mn、Fe 和 La。 10 mol% Cu 掺杂二氧化铈纤维对低温 CO 氧化表现出优异的催化活性，仅 52 °C 时 CO 转化率为 50%。这种 10 mol% Cu 掺杂样品在 400 °C 的简单环境空气退火下表现出意想不到的再生行为。根据 12 个样品的 CO 氧化行为，我们得出结论，拉曼光谱估计的绝对氧空位浓度并不是低温 CO 氧化催化剂的良好指标，除非格外小心，使拉曼信号反映氧化物表面状态。六种掺杂剂的实验趋势与文献中理论计算的氧空位形成能的一致性有限。