催化作用
材料科学
氧气
透射电子显微镜
空位缺陷
化学工程
电子能量损失谱
化学物理
扫描电子显微镜
扫描透射电子显微镜
氧还原
纳米颗粒
氧还原反应
光谱学
纳米技术
结晶学
物理化学
化学
复合材料
工程类
物理
量子力学
有机化学
生物化学
电化学
电极
作者
H. Hōjō,Kazuki Hirota,So Ito,Hisahiro Einaga
标识
DOI:10.1002/admi.202201954
摘要
Abstract CeO 2 and CeO 2 ‐based materials are widely used as catalysts and catalyst supports for a variety of chemical reactions. The ability to form oxygen vacancies plays an important role in the catalytic activities in these materials. Therefore, revealing the reduction mechanism for CeO 2 is crucial to understanding the catalytic activities. In this study, shape‐controlled CeO 2 nanoparticles are fabricated and the distribution of surface oxygen vacancies on the (100) and (111) surfaces is systematically studied using scanning transmission electron microscopy and electron energy‐loss spectroscopy and the response to H 2 reduction treatment. It is successfully demonstrated that both catalytic activities and the ability to form oxygen vacancies are strongly dependent on the type of lattice planes. Moreover, the present results provide important insights into the reduction mechanism for CeO 2 , in which bulk oxygen instead of the widely believed surface capping oxygen makes no small contribution to the initial reduction step.
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