XPS characterization of sensitized n-TiO2 thin films for dye-sensitized solar cell applications

Patrocínio, Antonio Otávio T.; Paniago, Eucler B.; Paniago, R.; Iha, Neyde Yukie Murakami

doi:10.1016/j.apsusc.2007.07.185

Cited by 86 publications

(62 citation statements)

References 39 publications

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“…TiO 2 nanoparticle films: A TiO 2 nanoparticle sol was prepared as previously reported. [21][22][23] The autoclave/hydrothermal temperature was set to 200 8C to create films with high optical transparency. TiO 2 nanoparticle films (ca.…”

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confidence: 99%

Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)₂((4,4′‐PO₃H₂)₂bpy)]²⁺ in TiO₂ Nanoparticle Films in Aqueous Environments

et al. 2011

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Nanosecond laser flash photolysis has been used to investigate injection and back electron transfer from the complex [(Ru(bpy)(2)(4,4'-(PO(3)H(2))(2)bpy)](2+) surface-bound to TiO(2) (TiO(2)-Ru(II)). The measurements were conducted under conditions appropriate for water oxidation catalysis by known single-site water oxidation catalysts. Systematic variations in average lifetimes for back electron transfer, <τ(bet)>, were observed with changes in pH, surface coverage, incident excitation intensity, and applied bias. The results were qualitatively consistent with a model involving rate-limiting thermal activation of injected electrons from trap sites to the conduction band or shallow trap sites followed by site-to-site hopping and interfacial electron transfer, TiO(2)(e(-))-Ru(3+) → TiO(2)-Ru(2+). The appearance of pH-dependent decreases in the efficiency of formation of TiO(2)-Ru(3+) and in incident-photon-to-current efficiencies with the added reductive scavenger hydroquinone point to pH-dependent back electron transfer processes on both the sub-nanosecond and millisecond-microsecond time scales, which could be significant in limiting long-term storage of multiple redox equivalents.

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Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)₂((4,4′‐PO₃H₂)₂bpy)]²⁺ in TiO₂ Nanoparticle Films in Aqueous Environments

et al. 2011

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“…Para a preparação dos fotoanodos, filmes de TiO 2 , obtidos a partir da rota sol-gel, 41 foram depositados por meio da técnica painting sobre vidros recobertos com uma camada condutora de óxido de estanho dopado com fluoreto, FTO (R = 10 W/, Pilkington). Após a deposição, os filmes foram secos à temperatura ambiente e sinterizados a 450 ºC por 30 min.…”

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“…[15][16][17][18][19][20][21][22][23][24] Nesse sentido, a natureza oferece um grande número de sensibilizadores como taninos, derivados da clorofila e antocianinas, que vêm sendo utilizados em células solares. 25 [38][39][40] Para a preparação dos fotoanodos, filmes de TiO 2 , obtidos a partir da rota sol-gel, 41 foram depositados por meio da técnica painting sobre vidros recobertos com uma camada condutora de óxido de estanho dopado com fluoreto, FTO (R = 10 W/, Pilkington). Após a deposição, os filmes foram secos à temperatura ambiente e sinterizados a 450 ºC por 30 min.…”

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Em busca da sustentabilidade: células solares sensibilizadas por extratos naturais

Patrocínio¹,

Iha²

2010

Quím. Nova

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. Prof. Lineu Prestes, 748, 05508-900 São Paulo -SP, BrasilRecebido em 6/3/09; aceito em 28/9/09; publicado na web em 25/2/10 TOWARD SUSTAINABILITY: SOLAR CELLS SENSITIZED BY NATURAL EXTRACTS. The present work reports the use of anthocyanins extracted from mulberry (Morus Alba L.), raspberry (Rubus Idaeus L.) and blueberry (Vaccinium myrtillus L.) as sensitizers in dye-sensitized solar cells. The conversion efficiency of these devices is dependent on the extracts employed and can be rationalized in terms of their composition and spectral properties. Solar cells sensitized by the mulberry extract showed the highest efficiency among the fruits investigated. Moreover, a 16 cm 2 active area solar cell with the mulberry extract has presented fair good efficiency of conversion for natural dye-based solar cells, besides stability over twenty weeks, showing perspectives for developing these low cost devices with a commercial viability.Keywords: dye sensitized solar cells; anthocyanins; natural extracts. INTRODUÇÃOA sociedade vive atualmente o desafio de desenvolver ações que garantam simultaneamente a manutenção dos ecossistemas ao redor do mundo e a oferta de energia e de insumos à população. O acúmulo de CO 2 na atmosfera e todas as mudanças climáticas associadas a esse fenômeno são indicativos da necessidade de soluções em um prazo relativamente curto. 1-3Uma das metas para promover o desenvolvimento sustentável consiste em diversificar a matriz energética mundial e aumentar a contribuição das fontes renováveis de energia, como energia solar, eólica e biomassa. Dentre as energias renováveis, a energia solar se destaca pela enorme disponibilidade, 3x10 24 J por ano, o que supera o consumo mundial atual de 4.1x10 20 J. 4,5As células solares sensibilizadas por corante, Dye-Cells ® , são uma das possibilidades mais promissoras de aproveitar a energia solar para geração de eletricidade em bases competitivas com o custo atual da energia convencional. [6][7][8][9][10][11][12][13] Células solares com eficiências de até 11% vêm sendo preparadas empregando complexos de Ru(II) como sensibilizadores.14 Apesar de eficientes, os complexos de Ru(II) exigem etapas de síntese e purificação, e por isso respondem por grande parte do custo final do dispositivo. Para a preparação dos fotoanodos, filmes de TiO 2 , obtidos a partir da rota sol-gel, 41 foram depositados por meio da técnica painting sobre vidros recobertos com uma camada condutora de óxido de estanho dopado com fluoreto, FTO (R = 10 W/, Pilkington). Após a deposição, os filmes foram secos à temperatura ambiente e sinterizados a 450 ºC por 30 min. Em seguida, foram imersos em uma solução etanólica saturada de N3, ou nos extratos aquosos das frutas já mencionadas. Células fotoeletroquímicas com 0,5 cm 2 de área ativa foram montadas com o fotoanodo e um contraeletrodo numa disposição tipo sanduíche. Como contraeletrodo, utilizou-se outro substrato condutor FTO recoberto com uma fina camada de platina. Como mediador, utilizou-se uma solução de I 3 -/I -(0,03/0,3 mol L -1

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“…In O 1s, the Acid specimen has a peak at 529.8 eV, while the L-base specimen has two peaks at 529.8 eV and 532.9 eV, here the H-base specimen has a peak at 532.9 eV. The peak at 529.8 eV corresponds to O 2-and the peak at 532.9 eV corresponds to OH - [17,20,21]. In the Mg 2p spectra, a peak at 50.2 eV is observed in the L-base and H-base specimens.…”

Section: Specimensmentioning

confidence: 99%

Corrosion resistant TiO2 film formed on magnesium by liquid phase deposition treatment

Fujita

Sakairi

Kikuchi

et al. 2011

Electrochimica Acta

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Liquid phase deposition treatment (LPD) was applied to form a corrosion protective titanium dioxide (TiO 2 ) film on commercially available pure magnesium. Changing the solution pH, from acidic to highly alkaline, and with the addition of sucrose, it becomes possible to form a highly adhesive and thin TiO 2 film on commercially available pure magnesium without any heat treatment. The role of the sucrose may be attributed to the formation of tetrafluoroboric acid (BF 4 ) -in the solution reducing the homogeneous nucleation of TiO 2 in the LPD solution. The film formed in the weak alkaline environment shows better corrosion resistance than at other LPD conditions, while the average rest potential is the same as that of as-polished specimens. This low rest potential may be due to micro-cracks in the formed film and high activity of the magnesium substrate.

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XPS characterization of sensitized n-TiO2 thin films for dye-sensitized solar cell applications

Cited by 86 publications

References 39 publications

Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)₂((4,4′‐PO₃H₂)₂bpy)]²⁺ in TiO₂ Nanoparticle Films in Aqueous Environments

Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)₂((4,4′‐PO₃H₂)₂bpy)]²⁺ in TiO₂ Nanoparticle Films in Aqueous Environments

Em busca da sustentabilidade: células solares sensibilizadas por extratos naturais

Corrosion resistant TiO2 film formed on magnesium by liquid phase deposition treatment

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XPS characterization of sensitized n-TiO2 thin films for dye-sensitized solar cell applications

Cited by 86 publications

References 39 publications

Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)2((4,4′‐PO3H2)2bpy)]2+ in TiO2 Nanoparticle Films in Aqueous Environments

Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)2((4,4′‐PO3H2)2bpy)]2+ in TiO2 Nanoparticle Films in Aqueous Environments

Em busca da sustentabilidade: células solares sensibilizadas por extratos naturais

Corrosion resistant TiO2 film formed on magnesium by liquid phase deposition treatment

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Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)₂((4,4′‐PO₃H₂)₂bpy)]²⁺ in TiO₂ Nanoparticle Films in Aqueous Environments

Interfacial Electron Transfer Dynamics Following Laser Flash Photolysis of [Ru(bpy)₂((4,4′‐PO₃H₂)₂bpy)]²⁺ in TiO₂ Nanoparticle Films in Aqueous Environments