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
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
收藏
页码:121 / 128
页数:8
相关论文
共 33 条
[11]  
2-U
[12]   HIGHLY EFFICIENT SEMICONDUCTING TIO2 PHOTOELECTRODES PREPARED BY AEROSOL PYROLYSIS [J].
KAVAN, L ;
GRATZEL, M .
ELECTROCHIMICA ACTA, 1995, 40 (05) :643-652
[13]   CHARACTERIZATION OF SOME TERNARY III-V SEMICONDUCTOR ELECTROLYTE INTERFACES UTILIZING ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY [J].
KOCHA, SS ;
LIEBERT, BE .
ELECTROCHIMICA ACTA, 1993, 38 (14) :1993-1997
[14]   Frequency-dependent electrical properties in the system SnO2-TiO2 [J].
Komornicki, S ;
Radecka, M ;
Rekas, M .
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 2001, 12 (01) :11-16
[15]   INTERFACIAL PHENOMENA OF TIO2-PHOTOANODES [J].
LAM, RUE ;
SCHOONMAN, J ;
BLASSE, G .
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1981, 85 (07) :592-597
[16]  
LAM RUE, 1981, PHYS CHEM, V85, P592
[17]  
LEE FJ, 1992, J APPL ELECTROCHEM, V22, P156
[18]  
MACDONALD JR, 1987, IMPEDANCE SPECTROSCO, P84
[19]   ELECTROCHEMICAL PROPERTIES OF POLYCRYSTALLINE TIO2 ELECTRODES PREPARED BY ANODIC-OXIDATION [J].
NOGAMI, G ;
OGAWA, Y ;
NISHIYAMA, Y .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1988, 135 (12) :3008-3015
[20]   Photoelectrochemical characterization of nanocrystalline TiO2 films on titanium substrates [J].
Oliva, FY ;
Avalle, LB ;
Santos, E ;
Cámara, OR .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2002, 146 (03) :175-188