Kinetics of the Regeneration by Iodide of Dye Sensitizers Adsorbed on Mesoporous Titania

doi:10.1021/jp501481c

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	Kinetics of the Regeneration by Iodide of Dye Sensitizers Adsorbed on Mesoporous Titania
	Teuscher, Joel 1,2; Marchioro, Arianna 1,2; Andres, Julien 1; Roch, Loic M.1; Xu, Mingfei 3; Zakeeruddin, Shaik M.2; Wang, Peng 3; Graetzel, Michael 2; Moser, Jacques-E 1
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2014-07-31
卷号	118 期号:30 页码:17108-17115
ISSN号	1932-7447
DOI	10.1021/jp501481c
英文摘要	Regeneration of dye sensitizer molecules by reducing species contained in the electrolyte is a key mechanism in liquid dye-sensitized solar cells because it competes kinetically with a detrimental charge recombination process. Kinetics of the reduction by iodide ions of the oxidized states (S+) of two Ru-II complex dyes and four organic pi-conjugated bridged donor-acceptor sensitizers were examined as a function of the electrolyte concentration. Results show that two different cases can be distinguished. A sublinear behavior of the regeneration rate and a plateau value reached at high bulk iodide concentrations were found for N820 ruthenium dye and interpreted as being due to an associative interaction involving the formation of (S+, I-)...I- surface complexes prior to the reaction. On the other hand, feeble reaction rates at low electrolyte concentrations and a superlinear behavior are observed predominantly for the organic dyes, pointing to a repulsive interaction between the dyed surface and iodide anions. At higher iodide bulk concentration, a linear behavior is reached, providing an estimate of a second-order rate constant. A correlation of these two opposite behaviors with the structure of the dye is observed, emphasizing the role of sulfur atoms in the association of I- anions in the dye-sensitized layer. These findings allow for a better understanding of the dye-electrolyte interaction and of the effect of the iodide concentration on the photovoltaic performances of dye-sensitized solar cells.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000339930900097
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/52645]
专题	中国科学院化学研究所
通讯作者	Teuscher, Joel
作者单位	1.Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Photochem Dynam Grp, CH-1015 Lausanne, Switzerland 2.Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland 3.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China
推荐引用方式 GB/T 7714	Teuscher, Joel,Marchioro, Arianna,Andres, Julien,et al. Kinetics of the Regeneration by Iodide of Dye Sensitizers Adsorbed on Mesoporous Titania[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(30):17108-17115.
APA	Teuscher, Joel.,Marchioro, Arianna.,Andres, Julien.,Roch, Loic M..,Xu, Mingfei.,...&Moser, Jacques-E.(2014).Kinetics of the Regeneration by Iodide of Dye Sensitizers Adsorbed on Mesoporous Titania.JOURNAL OF PHYSICAL CHEMISTRY C,118(30),17108-17115.
MLA	Teuscher, Joel,et al."Kinetics of the Regeneration by Iodide of Dye Sensitizers Adsorbed on Mesoporous Titania".JOURNAL OF PHYSICAL CHEMISTRY C 118.30(2014):17108-17115.