pH-dependent redox potential induced in a sensitizing dye by adsorption onto TiO2

被引：172

作者：

Zaban, A ^{[1
]}

Ferrere, S ^{[1
]}

Sprague, J ^{[1
]}

Gregg, BA ^{[1
]}

机构：

[1] NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 01期

关键词：

D O I：

10.1021/jp962252l

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：

The oxidation potential of a ruthenium(II)-polypyridine sensitizing dye is independent of pH when the dye is dissolved in solution. However, when the dye is adsorbed onto nanocrystalline TiO2, its oxidation potential becomes pH-dependent, decreasing 53 mV per unit pH. This is approximately the same pH-dependence as followed by the flatband potential of the TiO2. Therefore, the driving forces for both forward and back electron transfer reactions are practically independent of pH. This may explain the pH-independent rate of back electron transfer recently observed by Yan and Hupp (J. Phys. Chem. 1996, 100, 6867). To our knowledge, the induction of a pH-dependent redox potential upon adsorption of an otherwise pH-independent dye has not been previously reported.

引用

页码：55 / 57

页数：3

共 21 条

[1] LONG-LIVED PHOTOINDUCED CHARGE SEPARATION ACROSS NANOCRYSTALLINE TIO2 INTERFACES
ARGAZZI, R
BIGNOZZI, CA
HEIMER, TA
CASTELLANO, FN
MEYER, GJ
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1995, 117 (47) : 11815 - 11816
[2] Photoelectrochromic windows and displays
Bechinger, C
Ferrer, S
Zaban, A
Sprague, J
Gregg, BA
[J]. NATURE, 1996, 383 (6601) : 608 - 610
[3] A SOLID-STATE, DYE-SENSITIZED PHOTOELECTROCHEMICAL CELL
CAO, F
OSKAM, G
SEARSON, PC
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1995, 99 (47) : 17071 - 17073
[4] RATE CONSTANTS FOR CHARGE INJECTION FROM EXCITED SENSITIZER INTO SNO2, ZNO, AND TIO2 SEMICONDUCTOR NANOCRYSTALLITES
FESSENDEN, RW
KAMAT, PV
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1995, 99 (34) : 12902 - 12906
[5] NEGLECTED PROBLEMS IN THE PH-DEPENDENCE OF THE FLAT-BAND POTENTIAL OF SEMICONDUCTING OXIDES AND SEMICONDUCTORS COVERED WITH OXIDE LAYERS
GERISCHER, H
[J]. ELECTROCHIMICA ACTA, 1989, 34 (08) : 1005 - 1009
[6] GERISCHER H, 1972, PHOTOCHEM PHOTOBIOL, V16, P243
[7] VERIFICATION OF HIGH EFFICIENCIES FOR THE GRATZEL-CELL - A 7-PERCENT EFFICIENT SOLAR-CELL BASED ON DYE-SENSITIZED COLLOIDAL TIO2 FILMS
HAGFELDT, A
DIDRIKSSON, B
PALMQVIST, T
LINDSTROM, H
SODERGREN, S
RENSMO, H
LINDQUIST, SE
[J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS, 1994, 31 (04) : 481 - 488
[8] Photosensitization of nanocrystalline semiconductor films. Modulation of electron transfer between excited ruthenium complex and SnO2 nanocrystallites with an externally applied bias
Kamat, PV
Bedja, I
Hotchandani, S
Patterson, LK
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (12) : 4900 - 4908
[9] Electron transport properties in dye-sensitized nanoporous-nanocrystalline TiO2 films
Lindstrom, H
Rensmo, H
Sodergren, S
Solbrand, A
Lindquist, SE
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (08) : 3084 - 3088
[10] MEMMING R, 1972, PHOTOCHEM PHOTOBIOL, V16, P325

← 1 2 3 →