二氧化铈纳米催化剂可控合成及超微观构效关系研究

doi:10.19964/j.issn.1006-4990.2021-0628

摘要/Abstract

摘要：

铈（Ce）离子的价态转变往往伴随着氧的储存与释放以及氧空位（O_v）的形成与迁移,因此二氧化铈（CeO₂）材料被广泛地应用于汽车尾气处理、固态燃料电池、催化等领域。其中铈离子可逆的价态转变（Ce⁴⁺⇌Ce³⁺）是二氧化铈材料发挥其优异性能的关键。在当下中国社会加速实现“双碳”目标的国家战略之下,二氧化铈材料在能源和催化等领域将有着更广阔的应用前景。已有众多研究者借助表界面催化、纳米技术和先进的球差校正扫描透射电子显微学（AC-STEM）等技术,设计与合成结构合理且性能优良的二氧化铈纳米催化剂,并从超微观角度出发对其原子结构、离子价态、化学成分等物理化学性质进行了深入的分析与研究。基于此,综述了近些年来二氧化铈纳米催化剂的可控合成、晶面调控与生长、自组装、功能性掺杂等方面的最新研究进展,深入讨论了其原子结构、化学成分和物理化学性质之间的关系,建立了纳米催化剂的超微观构效关系,为设计合成多组分、多维度、高性能的二氧化铈纳米催化剂提供可靠的实验数据和有力的理论指导。

关键词: 二氧化铈, 纳米催化剂, 可控合成, 构效关系, 球差校正透射电子显微镜

Abstract:

The transformation process of valence state of Cerium（Ce） is often accompanied by the storage and release of oxy-gen and the formation and migration of oxygen vacancies（O_v）,thus the CeO₂-based materials are widely used in automotive exhaust gas treatment,solid fuel cells,catalysis and other fields.The reversible valence transition of Ce ions（Ce⁴⁺⇌Ce³⁺） is the key to the excellent performance of CeO₂-based materials.Under the background of accelerating the realization of the“dual carbon”goal in today′s society in China,CeO₂ is bound to have broader prospects in the fields of energy and catalysis.Based on the concept of surface and interface catalysis,nanotechnology and spherical aberration correction transmission electron microscopy,many researchers have designed and synthesized the CeO₂ nanocatalysts with rational structure and excellent performance,and conducted the in-depth investigation of its atomic structure,ion valence state,chemical composition and other physicochemical properties in-depth from an ultramicroscopic perspective.Therefore,the latest research progress in the controllable synthesis,facet modification and growth,self-assembly,and functional doping of CeO₂ nanocatalysts was reviewd,and the relationship between atomic structure,chemical composition and physicochemical properties was discussed deeply,which was aiming at construction of the ultramicroscopic structure-activity relationship of functional nanocatalysts at the atomic scale and providing the reliable experimental data and powerful theoretical guidance for the design and synthesis of multi-component,multi-dimensional,high-performance CeO₂ nanocatalyst.

Key words: cerium oxides, nanocatalyst, controllable synthesis, structure-activity relationship, aberration-corrected transmission electron microscopy

中图分类号:

TQ133.3

郝晓东,冯心怡,徐阳,张西数,刘雯,郝方原,马淑芳,许并社. 二氧化铈纳米催化剂可控合成及超微观构效关系研究[J]. 无机盐工业, 2022, 54(3): 7-17.

HAO Xiaodong,FENG Xinyi,XU Yang,ZHANG Xishu,LIU Wen,HAO Fangyuan,MA Shufang,XU Bingshe. Study on controllable synthesis and ultramicroscopic structure-activity relationship of cerium oxides nanocatalysts[J]. Inorganic Chemicals Industry, 2022, 54(3): 7-17.

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