SrTiO3 single crystals enclosed with high-indexed {023} facets and {001} facets for photocatalytic hydrogen and oxygen evolution
SrTiO3 single crystals enclosed with high-indexed {023} facets and {001} facets for photocatalytic hydrogen and oxygen evolution
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SrTiO3 单晶被高折射率 {0 2 3} 面和 {0 0 1} 面包围，用于光催化析氢和析氧
DOI：
10.1016/j.apcatb.2014.11.032
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发表时间：
2015
影响因子：
22.1
通讯作者：
Liejin Guo
中科院分区：
文献类型：
--
作者：
Bin Wang;Shaohua Shen;Liejin Guo
采用溶剂热法一锅法合成了具有高折射率{0 2 3}面和{0 0 1}面的SrTiO 3单晶。{0 2 3}与{0 0 1}晶面的比例可以通过调节溶剂热生长过程中NaOH和EA的浓度来简单地调节。结果表明，不同形状的SrTiO 3的光催化活性与SrTiO 3的形态密切相关，即，{0 2 3}与{0 0 1}面的比率。当{0 2 3}：{0 0 1}晶面比为35：65时，SrTiO 3单晶的光催化活性最高，析氢和析氧速率分别达到71.1和30.0 μmol/h，分别是不规则SrTiO 3的9.5和3.0倍.金属离子的小面选择性光沉积表明，高指数{0 2 3}小面为光氧化反应提供活性位，而{0 0 1}小面为光还原反应提供活性位.这种空间上分离的光活性还原和氧化位点应有利于SrTiO 3单晶中的电荷分离，从而导致与不规则SrTiO 3颗粒相关的更高的光催化活性。
SrTiO3single crystals enclosed with high-indexed {0 2 3} facets and {0 0 1} facets were facilely synthesizedviaa one-pot solvothermal method. The ratio of {0 2 3} to {0 0 1} facets could be simply adjusted by tuning the NaOH and EA concentrations during the solvothermal growth process. It was demonstrated that the photocatalytic activities of the variously shaped SrTiO3should be closely related to the morphology of SrTiO3,i.e., the ratio of {0 2 3} to {0 0 1} facet. The highest photocatalytic activities are achieved for SrTiO3single crystals with the ratio of {0 2 3} to {0 0 1} facet tuned to 35:65, with hydrogen and oxygen evolution rates reaching 71.1 and 30.0 μmol/h, respectively, which are about 9.5 and 3.0 times higher than those of the irregular SrTiO3particles. Facet selective photo-deposition of metal ions reveals that the high-indexed {0 2 3} facets provided active sites for photo-oxidation reaction, while the {0 0 1} facets offered active sites for photo-reduction reaction. Such spatially separated photoactive reduction and oxidation sites should benefit charge separation in a SrTiO3single crystal, leading to higher photocatalytic activity related to the irregular SrTiO3particles.