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离子液体辅助微波合成用于光催化应用的SrBaSnO钙钛矿固溶体

Ionic-Liquid-Assisted Microwave Synthesis of Solid Solutions of Sr Ba SnO Perovskite for Photocatalytic Applications.

作者信息

Alammar Tarek, Slowing Igor I, Anderegg Jim, Mudring Anja-Verena

机构信息

Department of Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA.

The Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.

出版信息

ChemSusChem. 2017 Sep 11;10(17):3387-3401. doi: 10.1002/cssc.201700615. Epub 2017 Jul 17.

DOI:10.1002/cssc.201700615
PMID:28589568
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5601214/
Abstract

Nanocrystalline Sr Ba SnO (x=0, 0.2, 0.4, 0.8, 1) perovskite photocatalysts were prepared by microwave synthesis in an ionic liquid (IL) and subsequent heat-treatment. The influence of the Sr/Ba substitution on the structure, crystallization, morphology, and photocatalytic efficiency was investigated and the samples were fully characterized. On the basis of X-ray diffraction results, as the Ba content in the SrSnO lattice increases, a symmetry increase was observed from the orthorhombic perovskite structure for SrSnO to the cubic BaSnO structure. The analysis of the sample morphology by SEM reveals that the Sr Ba SnO samples favor the formation of nanorods (500 nm-5 μm in diameter and several micrometers long). The photophysical properties were examined by UV/Vis diffuse reflectance spectroscopy. The band gap decreases from 3.85 to 3.19 eV with increasing Ba content. Furthermore, the photocatalytic properties were evaluated for the hydroxylation of terephthalic acid (TA). The order of the activities for TA hydroxylation was Sr Ba SnO >SrSnO >BaSnO >Sr Ba SnO >Sr Ba SnO . The highest photocatalytic activity was observed for Sr Ba SnO , and this can be attributed to the synergistic impacts of the modification of the crystal structure and morphology, the relatively large surface area associated with the small crystallite size, and the suitable band gap and band-edge position.

摘要

通过在离子液体（IL）中进行微波合成并随后进行热处理，制备了纳米晶SrBaSnO（x = 0、0.2、0.4、0.8、1）钙钛矿光催化剂。研究了Sr/Ba取代对结构、结晶、形态和光催化效率的影响，并对样品进行了全面表征。基于X射线衍射结果，随着SrSnO晶格中Ba含量的增加，观察到从SrSnO的正交钙钛矿结构到立方BaSnO结构的对称性增加。通过扫描电子显微镜对样品形态进行分析表明，SrBaSnO样品有利于形成纳米棒（直径500 nm - 5μm，长几微米）。通过紫外/可见漫反射光谱研究了光物理性质。随着Ba含量的增加，带隙从3.85 eV降低到3.19 eV。此外，对苯二甲酸（TA）的羟基化反应评估了光催化性能。TA羟基化反应活性顺序为SrBaSnO＞SrSnO＞BaSnO＞SrBaSnO＞SrBaSnO。SrBaSnO表现出最高的光催化活性，这可归因于晶体结构和形态改性的协同影响、与小晶粒尺寸相关的相对较大表面积以及合适的带隙和带边位置。

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