Some aspects of the charge transfer dynamics in nanostructured WO3 films

被引:43
作者
Cristino, Vito [1 ]
Marinello, Sabrina [1 ]
Molinari, Alessandra [1 ]
Caramori, Stefano [1 ]
Carli, Stefano [1 ]
Boaretto, Rita [1 ]
Argazzi, Roberto [2 ]
Meda, Laura [3 ]
Bignozzi, Carlo Alberto [1 ]
机构
[1] Univ Ferrara, Dept Chem & Pharmaceut Sci, Via Fossato Mortara 17, I-44121 Ferrara, Italy
[2] CNR ISOF, Dept Chem & Pharmaceut Sci, Via Fossato Mortara 17, I-44121 Ferrara, Italy
[3] Ist ENI Donegani, Via Fauser 4, I-28100 Novara, Italy
关键词
TUNGSTEN-OXIDE FILMS; MESOPOROUS WO3; PHOTOELECTROCHEMICAL PERFORMANCE; WATER OXIDATION; ANODIC GROWTH; TANDEM CELL; THIN-FILMS; ELECTROLYTES; SELECTIVITY; ELECTRODES;
D O I
10.1039/c5ta06887h
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 photoanodic response of two different types of nanocrystalline WO3 electrodes prepared by following either the sol gel approach or the accelerated anodization route was explored in sulfate containing electrolytes with the aim of exploring the mechanism of charge separation at WO3/electrolyte interfaces. Combined evidence by electrochemical impedance spectroscopy and transient absorption spectroscopy indicates that hole transfer occurs through the valence band and that, under applied bias, the voltage drop involves predominantly the space charge layer of the semiconductor, controlling the photocurrent via potential-induced variations of hole density at the surface of WO3. OH radicals were found among the primary water oxidation intermediates, and are partly responsible for mediated back recombination. The generation of hydroxyl radicals suggests, however, that WO3 based materials can find promising applications in environmental photoremediation under visible light, promoting (OH)-O-center dot mediated oxidation of impervious contaminants. In principle, the removal of (OH)-O-center dot by organic scavengers will also optimize the photocurrent generation in photoelectrochemical cells where the generation of hydrogen can be coupled to environmental decontamination.
引用
收藏
页码:2995 / 3006
页数:12
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