Roles of MgO coating layer on mesoporous TiO2/ITO electrode in a photoelectrochemical cell for water splitting

被引：23

作者：

Bae, Shin-Tae ^{[1
]}

Shin, Hyunho ^{[2
]}

Kim, Jin Young ^{[3
]}

Jung, Hyun Suk ^{[4
]}

Hong, Kug Sun ^{[1
]}

机构：

[1] Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151744, South Korea

[2] Kangnung Natl Univ, Dept Ceram Engn, Kangnung 210702, Gangwon Do, South Korea

[3] Natl Renewable Energy Lab, Chem & Biosci Ctr, Golden, CO 80401 USA

[4] Kookmin Univ, Sch Adv Mat Engn, Seoul 136702, South Korea

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 26期

关键词：

D O I：

10.1021/jp8021562

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A MgO layer was spin coated on a mesoporous TiO2/ITO electrode for application to the working electrode of a water splitting photoelectrochemical cell. The role of MgO has two faces: (1) blocking the back electron transfer from TiO2 to electrolyte (positive influence) and (2) blocking the hole escape from TiO2 to electrolyte (negative influence). The competition between the positive and negative influences of the MgO layer results in maximal performance of the cell at an optimum effective thickness of the MgO layer. Further, the mechanism of light interference of the electrolyte/MgO/TiO2 system also contributes to the performance maximization with regard to the MgO layer thickness. Under a bias voltage, however, the role of blocking the hole escape prevails the blocking of the back electron transfer as well as the influence of the light interference; thereby the increase of MgO thickness diminishes the performance of the cell.

引用

页码：9937 / 9942

页数：6

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