Controlled Loading of Small Aun Clusters (n = 10–39) onto BaLa4Ti4O15 Photocatalysts: Toward an Understanding of Size Effect of Cocatalyst on Water-Splitting Photocatalytic Activity

Autor:	Ryota Tomizawa, Akihiko Kudo, Yuichi Negishi, Yoshiki Matsuura, Tomoaki Takayama, Wataru Kurashige, Akihide Iwase, Yoshiki Niihori
Rok vydání:	2015
Předmět:	General Energy Materials science Chemical engineering Colloidal gold Atom Dispersity Cluster (physics) Photocatalysis Water splitting Nanotechnology Physical and Theoretical Chemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials
Zdroj:	The Journal of Physical Chemistry C. 119:11224-11232
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp5122432
Popis:	We have recently succeeded in loading extremely small monodisperse gold clusters (1.2 ± 0.3 nm) as cocatalysts on a water-splitting BaLa4Ti4O15 photocatalyst using a glutathione-protected Au25 cluster (Au25(SG)18) as a precursor; an improved photocatalytic activity of 2.6-fold was obtained when compared with that of BaLa4Ti4O15 onto which large gold nanoparticles (10–30 nm) were loaded. In the current study, the controlled loading of a series of ultrasmall Aun clusters onto BaLa4Ti4O15 using various Aun(SG)m clusters (n = 10, 15, 18, 22, 25, 29, 33, 39) was examined. The results revealed that the use of a highly stable cluster as a precursor is essential for achieving control over the loading of the gold clusters. Additionally, the origin of the improved photocatalytic activity owing to the ultra miniaturization of the cocatalyst was reconsidered herein based on the photocatalytic activities of the obtained photocatalysts. The results strongly suggested that the activity per gold atom on the surface decre...
Databáze:	OpenAIRE
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