六面体棱镜锚定八面体 CeO2：基于晶面的同质结促进高效太阳能燃料合成,Journal of the American Chemical Society

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六面体棱镜锚定八面体 CeO2：基于晶面的同质结促进高效太阳能燃料合成
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2015-07-24 , DOI: 10.1021/jacs.5b05926
Ping Li , Yong Zhou ₁ , Zongyan Zhao ₂ , Qinfeng Xu , Xiaoyong Wang , Min Xiao , Zhigang Zou ₁

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通过基于溶液的晶体定向外延生长，制备了一种前所未有的基于晶面的 CeO2 同质结，由六面体棱柱锚定八面体和 {100} 面的暴露棱柱表面和 {111} 面的八面体表面组成。光催化实验表明，八面体上棱柱臂的生长允许激活惰性 CeO2 八面体，以增加光催化还原 CO2 为甲烷。显着的光催化性能归因于以下三个因素的协同效应：（1）{100}和{111}的能带排列分别驱动电子和空穴到八面体和棱柱表面，旨在达到最稳定的能量配置并导致长时间的空间电荷分离；(2)经界面晶格条纹验证的八面体上CeO2六面体棱柱臂的晶体取向外延生长为两个同质结单元之间的光生载流子传输提供了方便快捷的通道；(3) {100}和{111}面上电子和空穴的不同有效质量导致高电荷载流子迁移率，更促进电荷分离。这项工作中提出的基于小平面的同质结可能为光生电荷载流子的有效分离和快速转移以及光催化性能的提高提供了一个新的概念。(3) {100}和{111}面上电子和空穴的不同有效质量导致高电荷载流子迁移率，更促进电荷分离。这项工作中提出的基于小平面的同质结可能为光生电荷载流子的有效分离和快速转移以及光催化性能的提高提供了一个新的概念。(3) {100}和{111}面上电子和空穴的不同有效质量导致高电荷载流子迁移率，更促进电荷分离。这项工作中提出的基于小平面的同质结可能为光生电荷载流子的有效分离和快速转移以及光催化性能的提高提供了一个新的概念。

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Hexahedron Prism-Anchored Octahedronal CeO2: Crystal Facet-Based Homojunction Promoting Efficient Solar Fuel Synthesis

An unprecedented, crystal facet-based CeO2 homojunction consisting of hexahedron prism-anchored octahedron with exposed prism surface of {100} facets and octahedron surface of {111} facets was fabricated through solution-based crystallographic-oriented epitaxial growth. The photocatalysis experiment reveals that growth of the prism arm on octahedron allows to activate inert CeO2 octahedron for an increase in phototocatalytic reduction of CO2 into methane. The pronounced photocatalytic performance is attributed to a synergistic effect of the following three factors: (1) band alignment of the {100} and {111} drives electrons and holes to octahedron and prism surfaces, respectively, aiming to reach the most stable energy configuration and leading to a spatial charge separation for long duration; (2) crystallographic-oriented epitaxial growth of the CeO2 hexahedron prism arm on the octahedron verified by the interfacial lattice fringe provides convenient and fast channels for the photogenerated carrier transportation between two units of homojuntion; (3) different effective mass of electrons and holes on {100} and {111} faces leads to high charge carrier mobility, more facilitating the charge separation. The proposed facet-based homojunction in this work may provide a new concept for the efficient separation and fast transfer of photoinduced charge carriers and enhancement of the photocatalytic performance.

更新日期：2015-07-24

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