Synergistic effect between anatase and rutile TiO2 nanoparticles in dye-sensitized solar cells

被引：199

作者：

Li, Gonghu ^{[1
]}

Richter, Christiaan P. ^{[1
]}

Milot, Rebecca L. ^{[1
]}

Cai, Lawrence ^{[1
]}

Schmuttenmaer, Charles A. ^{[1
]}

Crabtree, Robert H. ^{[1
]}

Brudvig, Gary W. ^{[1
]}

Batista, Victor S. ^{[1
]}

机构：

[1] Yale Univ, Dept Chem, New Haven, CT 06520 USA

来源：

DALTON TRANSACTIONS | 2009年 / 45期

关键词：

MIXED-PHASE TIO2; ENERGY CONVERSION; PHOTOCATALYTIC ACTIVITY; MESOPOROUS TITANIA; FILMS; SURFACE; PHOTOOXIDATION; NANOCOMPOSITES; PERFORMANCE; FABRICATION;

D O I：

10.1039/b908686b

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A synergistic effect between anatase and rutile TiO2 is known, in which the addition of rutile can remarkably enhance the photocatalytic activity of anatase in the degradation of organic contaminants. In this study, mixed-phase TiO2 nanocomposites consisting of anatase and rutile nanoparticles (NPs) were prepared for use as photoanodes in dye-sensitized solar cells (DSSCs) and were characterized by using UV-vis spectroscopy, powder X-ray diffraction and scanning electron microscopy. The addition of 10-15% rutile significantly improved light harvesting and the overall solar conversion efficiency of anatase NPs in DSSCs. The underlying mechanism for the synergistic effect in DSSCs is now explored by using time-resolved terahertz spectroscopy. It is clearly demonstrated that photo-excited electrons injected into the rutile NPs can migrate to the conduction band of anatase NPs, enhancing the photocurrent and efficiency. Interfacial electron transfer from rutile to anatase, similar to that in heterogeneous photocatalysis, is proposed to account for the synergistic effect in DSSCs. Our results further suggest that the synergistic effect can be used to explain the beneficial effect of TiCl4 treatment on DSSC efficiency.

引用

页码：10078 / 10085

页数：8

共 58 条

[1] Ultrafast photooxidation of Mn(II)-Terpyridine complexes covalently attached to TiO2 nanoparticles [J].