Molecule-Based Water-Oxidation Catalysts (WOCs): Cluster-Size-Dependent Dye-Sensitized Polyoxometalates for Visible-Light-Driven O-2 Evolution

作者：Gao Junkuo; Cao Shaowen; Tay Qiuling; Liu Yi; Yu Lingmin; Ye Kaiqi; Mun Peter Choon Sze; Li Yongxin; Rakesh Ganguly; Loo Say Chye Joachim; Chen Zhong; Zhao Yang; Xue Can; Zhang Qichun^*

来源：Scientific Reports, 2013, 3(1): 1853.

DOI：10.1038/srep01853

From atomic level to understand the cluster-size-dependant behavior of dye-sensitized photocatalysts is very important and helpful to design new photocatalytic materials. Although the relationship between the photocatalytic behaviors and particles%26apos; size/shape has been widely investigated by theoretical scientists, the experimental evidences are much less. In this manuscript, we successfully synthesized three new ruthenium dye-sensitized polyoxometalates (POM-n, n relate to different size clusters) with different-sized POM clusters. Under visible-light illumination, all three complexes show the stable O-2 evolution with the efficient order POM-3 %26gt; POM-2 %26gt; POM-1. This cluster-size-dependent catalytic behavior could be explained by the different numbers of M = O-t (terminal oxygen) bonds in each individual cluster because it is well-known that Mo = O-t groups are the catalytically active sites for photooxidation reaction. The proposed mechanism of water oxidation for the dye-sensitized POMs is radical reaction process. This research could open up new perspectives for developing new POM-based WOCs.

• 出版日期2013-5-16
• 单位南阳理工学院