Effect of Ferroelectricity on Solar-Light-Driven Photocatalytic Activity of BaTiO3-Influence on the Carrier Separation and Stern Layer Formation
Effect of Ferroelectricity on Solar-Light-Driven Photocatalytic Activity of BaTiO3-Influence on the Carrier Separation and Stern Layer Formation
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DOI：
10.1021/cm402092f
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发表时间：
2013-11-12
影响因子：
8.6
通讯作者：
Dunn, Steve
中科院分区：
文献类型：
--
作者：
Cui, Yongfei;Briscoe, Joe;Dunn, Steve
以BaTiO3为目标催化剂，研究了铁电性对典型染料分子罗丹明b在模拟太阳光下脱色的影响。我们发现，与以立方材料为主的材料相比，使用具有高四方含量的BaTiO3的脱色率提高了3倍。这是由于四方相的铁电性。铁电性的影响确保了染料分子的紧密结合层，并且由于内部空间电荷层的存在而使光激发载流子分离。这两种特性都有助于提高催化性能。当纳米结构银光化学沉积在BaTiO3表面时，我们发现反应速率进一步提高，在45分钟左右的时间内染料完全脱色。
BaTiO3 is used as a target catalyst to probe the influence of ferroelectricity on the decolorization of a typical dye molecule-Rhodamine B-under simulated solar light. We show that there is a 3-fold increase in the decolorization rate using BaTiO3 with a high tetragonal content compared to predominantly cubic material. This is ascribed to the ferroelectricity of the tetragonal phase. The influence of ferroelectricity ensures a tightly bound layer of dye molecule and also acts to separate the photoexcited carriers due to the internal space charge layer. Both of these features act to enhance the catalytic performance. When nanostructured Ag is photochemically deposited on the surface of the BaTiO3, we find a further increase in the reaction rate that gives complete decolorization of the dye in around 45 min.