Photocatalytic Water Oxidation with Nonsensitized IrO2 Nanocrystals under Visible and UV Light

被引：225

作者：

Frame, F. Andrew ^{[1
]}

Townsend, Troy K. ^{[1
]}

Chamousis, Rachel L. ^{[1
]}

Sabio, Erwin M. ^{[1
]}

Dittrich, Th ^{[2
]}

Browning, Nigel D. ^{[3
]}

Osterloh, Frank E. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA

[2] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

[3] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 19期

基金：

美国国家科学基金会;

关键词：

CATALYSTS; OXYGEN; IRRADIATION; REDUCTION; EVOLUTION; COLLOIDS; FILM;

D O I：

10.1021/ja200144w

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Rutile IrO2 is known as being among the best electrocatalysts for water oxidation. Here we report on the unexpected photocatalytic water oxidation activity of 1.98 nm +/- 0.11 nm succinic acid-stabilized IrO2 nanocrystals. From aqueous persulfate and silver nitrate solution the nonsensitized particles evolve oxygen with initial rates up to 0.96 mu mol min(-1) and with a quantum efficiency of at least 0.19% (measured at 530 nm). The catalytic process is driven by visible excitations from the Ir-d(t(2g)) to the Ir-d(e(g)) band (1.5-2.75 eV) and by ultraviolet excitations from the O-p band to the Ir-d(e(g)) (>3.0 eV) band. The formation of the photogenerated charge carriers can be directly observed with surface photovoltage spectroscopy. The results shed new light on the role of IrO2 in dye- and semiconductor-sensitized water splitting systems.

引用

页码：7264 / 7267

页数：4

共 28 条

[1] Electrochemical and photoelectrochemical study on exfoliated Nb3O8 nanosheet [J].