Wang Xianwei, Wang Jingyi, Sun Yafei, Li Kanghui, Shang Tongxin, Wan Ying
The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai Normal University, Shanghai, China.
Front Chem. 2022 Dec 8;10:1089708. doi: 10.3389/fchem.2022.1089708. eCollection 2022.
Cerium dioxide (CeO, ceria) has long been regarded as one of the key materials in modern catalysis, both as a support and as a catalyst itself. Apart from its well-established use (three-way catalysts and diesel engines), CeO has been widely used as a cocatalyst/catalyst in energy conversion and storage applications. The importance stems from the oxygen storage capacity of ceria, which allows it to release oxygen under reducing conditions and to store oxygen by filling oxygen vacancies under oxidizing conditions. However, the nature of the Ce active site remains not well understood because the degree of participation of electrons in catalytic reactions is not clear in the case of the heavy dependence of catalysis theory on localized orbitals at the Fermi energy . This review focuses on the catalytic applications in energy conversion and storage of CeO-based nanostructures and discusses the mechanisms for several typical catalytic reactions from the perspectives of electronic properties of CeO-based nanostructures. Defect engineering is also summarized to better understand the relationship between catalytic performance and electronic properties. Finally, the challenges and prospects of designing high efficiency CeO-based catalysts in energy storage and conversion have been emphasized.
二氧化铈（CeO，氧化铈）长期以来一直被视为现代催化领域的关键材料之一，既作为载体，也作为催化剂本身。除了其已确立的用途（三元催化剂和柴油发动机）外，CeO还被广泛用作能量转换和存储应用中的助催化剂/催化剂。其重要性源于氧化铈的储氧能力，这使其能够在还原条件下释放氧气，并在氧化条件下通过填充氧空位来储存氧气。然而，Ce活性位点的性质仍未得到很好的理解，因为在催化理论严重依赖费米能级处的局域轨道的情况下，电子在催化反应中的参与程度尚不清楚。本综述重点关注基于CeO的纳米结构在能量转换和存储中的催化应用，并从基于CeO的纳米结构的电子性质角度讨论几种典型催化反应的机理。还总结了缺陷工程，以更好地理解催化性能与电子性质之间的关系。最后，强调了设计高效的基于CeO的催化剂在能量存储和转换方面的挑战与前景。
