Unprecedentedly enhanced solar photocatalytic activity of a layered titanate simply integrated with TiO2 nanoparticles
Unprecedentedly enhanced solar photocatalytic activity of a layered titanate simply integrated with TiO2 nanoparticles
复制标题
DOI：
10.1039/c6cp05635k
复制
发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Ide, Yusuke
中科院分区：
文献类型：
--
作者：
Saito, Kanji;Kozeni, Misa;Ide, Yusuke
我们报道了一种简单，低成本的方法，前所未有地提高了层状无机半导体的光催化活性。具有纤铁矿型结构的层状钛酸盐在模拟太阳光下几乎没有显示出用于测试反应（将水中的甲酸氧化分解成CO2）的光催化活性，但是在与少量（约10重量%）的市售TiO 2纳米颗粒（P25）在水中混合时，其显示出高度增强的光催化活性。该混合物的光催化活性约为基准光催化剂P25的5倍。从各种分析，增强导致从光激发的电子从层状钛酸盐转移到P25在其颗粒界面和电荷复合的延迟。当应用于模拟太阳光下的含甲醇的水的H-2生产的光催化剂，层状钛酸酯/P25混合物显示出显着增强的活性和表观量子产率为23%（在320 nm处）。通过用负载Pt助催化剂的P25代替P25，混合物的表观量子产率从23%增加到73%，尽管在系统中使用极少量（低于0.06%）的Pt。
We report a simple, low-cost methodology for unprecedentedly enhancing the photocatalytic activity of layered inorganic semiconductors. A layered titanate with a lepidocrocite-type structure scarcely showed photocatalytic activity for a test reaction, the oxidative decomposition of formic acid in water into CO2, under simulated solar light, but it showed highly enhanced photocatalytic activity upon mixing with a much smaller amount (approximately 10 wt%) of commercially available TiO2 nanoparticles (P25) in water. The photocatalytic activity of the mixture was approximately 5 times that of P25, a benchmark photocatalyst. From various analyses, the enhancement resulted from the transfer of photoexcited electrons from the layered titanate to P25 at their particle interfaces and retardation of charge recombination. When applied to a photocatalyst for H-2 production from water containing methanol under simulated solar light, the layered titanate/P25 mixture showed considerably enhanced activity and the apparent quantum yield was 23% (at 320 nm). By replacing P25 with Pt co-catalyst-loaded P25, the apparent quantum yield of the mixture increased from 23 to 73%, although an extremely small amount (below 0.06%) of Pt was used in the system.