Journal ArticleDOI
Synergistic effect between anatase and rutile TiO2 nanoparticles in dye-sensitized solar cells
Gonghu Li,Christiaan Richter,Rebecca L. Milot,Lawrence Cai,Charles A. Schmuttenmaer,Robert H. Crabtree,Gary W. Brudvig,Victor S. Batista +7 more
TLDR
In this paper, mixed-phase TiO2 nanocomposites consisting of anatase and rutile nanoparticles (NPs) were used as photoanodes in dye-sensitized solar cells (DSSCs) and were characterized by using UV-vis spectroscopy, powder X-ray diffraction and scanning electron microscopy.Abstract:
A synergistic effect between anatase and rutile TiO2 is known, in which the addition of rutile can remarkably enhance the photocatalytic activity of anatase in the degradation of organic contaminants. In this study, mixed-phase TiO2 nanocomposites consisting of anatase and rutile nanoparticles (NPs) were prepared for use as photoanodes in dye-sensitized solar cells (DSSCs) and were characterized by using UV-vis spectroscopy, powder X-ray diffraction and scanning electron microscopy. The addition of 10–15% rutile significantly improved light harvesting and the overall solar conversion efficiency of anatase NPs in DSSCs. The underlying mechanism for the synergistic effect in DSSCs is now explored by using time-resolved terahertz spectroscopy. It is clearly demonstrated that photo-excited electrons injected into the rutile NPs can migrate to the conduction band of anatase NPs, enhancing the photocurrent and efficiency. Interfacial electron transfer from rutile to anatase, similar to that in heterogeneous photocatalysis, is proposed to account for the synergistic effect in DSSCs. Our results further suggest that the synergistic effect can be used to explain the beneficial effect of TiCl4 treatment on DSSC efficiency.read more
Citations
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Journal ArticleDOI
Doping of TiO2 for sensitized solar cells
TL;DR: It was found that nearly every employed dopant can be used to increase device performance, indicating that the improvement is not so much caused by the dopant itself, as by the defects it eliminates from TiO2.
Journal ArticleDOI
Heterogeneous photocatalytic organic synthesis: state-of-the-art and future perspectives
TL;DR: In this paper, a review is presented on achievements in heterogeneous photocatalytic organic synthesis, and a comparison is drawn between systems optimised for heterogeneous organic degradation and heterogeneous catalytic organics.
Journal ArticleDOI
TiO2 photocatalysis for the degradation of pollutants in gas phase: From morphological design to plasmonic enhancement
TL;DR: In this article, a review of recent trends in TiO2 photocatalyst modification for the intensification of photocatalytic air treatment has been presented, with the main focus on recent developments, but also possible opportunities to the field.
Journal ArticleDOI
A visible light water-splitting cell with a photoanode formed by codeposition of a high-potential porphyrin and an iridium water-oxidation catalyst
Gary F. Moore,James D. Blakemore,Rebecca L. Milot,Jonathan F. Hull,Hee Eun Song,Lawrence Cai,Charles A. Schmuttenmaer,Robert H. Crabtree,Gary W. Brudvig +8 more
TL;DR: In this paper, a high-potential porphyrin is codeposited on TiO2 nanoparticles together with a Cp*-iridium water-oxidation catalyst to give a photoanode for a water splitting cell.
Journal ArticleDOI
Exciton-like trap states limit electron mobility in TiO2 nanotubes
TL;DR: It is shown, through time-resolved terahertz spectroscopy, that low mobility in polycrystalline TiO(2) nanotubes is not due to scattering from grain boundaries or disorder-induced localization as in other nanomaterials, but instead results from a single sharp resonance arising from exciton-like trap states.
References
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Journal ArticleDOI
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
Journal Article
Photoelectrochemical cells : Materials for clean energy
TL;DR: In this paper, the authors look into the historical background, and present status and development prospects for photoelectrochemical cells, based on nanocrystalline materials and conducting polymer films.
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An overview of semiconductor photocatalysis
Andrew Mills,Stephen Le Hunte +1 more
TL;DR: An overview of the field of semiconductor photocatalysis can be found in this paper, where a brief examination of its roots, achievements and possible future is presented, and the semiconductor titanium dioxide (TiO 2 ) features predominantly in past and present work.
Journal ArticleDOI
Solar energy conversion by dye-sensitized photovoltaic cells
TL;DR: Developing solar cells that are based on the sensitization of mesoscopic oxide films by dyes or quantum dots, and the examples for the first outdoor application of such solar cells will be provided.
Journal ArticleDOI
Combined Experimental and DFT-TDDFT Computational Study of Photoelectrochemical Cell Ruthenium Sensitizers
Mohammad Khaja Nazeeruddin,Filippo De Angelis,Simona Fantacci,Annabella Selloni,Guido Viscardi,Paul Liska,Seigo Ito,Bessho Takeru,Michael Grätzel +8 more
TL;DR: The computed alignments of the molecular orbitals of the different complexes with the band edges of a model TiO(2) nanoparticle provide additional insights into the electronic factors governing the efficiency of dye-sensitized solar cell devices.
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