Photoelectrochemical cell studied by impedance spectroscopy

被引：31

作者：

Radecka, M ^{[1
]}

Wierzbicka, M ^{[1
]}

Rekas, M ^{[1
]}

机构：

[1] AGH Univ Sci & Technol, Fac Mat Sci & Ceram, PL-30059 Krakow, Poland

来源：

PHYSICA B-CONDENSED MATTER | 2004年 / 351卷 / 1-2期

关键词：

impedance spectroscopy; equivalent circuit; photo-electrochemical cells; TiO2; photo-electrodes;

D O I：

10.1016/j.physb.2004.05.020

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The impedance of the photo-electrochemical cells using TiO2 thin film electrodes was investigated by means of complex admittance spectra within the frequency range 0.01 Hz-100kHz, and in the presence of an electrical bias between -0.7 and 0.4V. Plausible equivalent circuits are discussed. It was found that the impedance can be divided into two frequency ranges. Based on the determined capacitance vs. bias voltage, both flat band potential and density of donors of the TiO2 electrode have been estimated. The flat band potential with respect to a saturated calomel electrode and the density of donors were -0.64 V and 3.7 x 10(24) mm(-3), respectively. The thickness of the depletion layer corresponding to 1 V voltage was equal to 46 nm. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：121 / 128

页数：8

共 33 条

[1] Photoresponse and AC impedance characterization of m-TiO2 films during hydrogen and oxygen evolution reactions in an electrochemical cell [J].