Photocatalytic production of hydrogen from water using TiO2 and B/TiO2

Moon, Sang-Chul; Mametsuka, Hiroaki; Tabata, Soichi; Suzuki, Eiji

doi:10.1016/s0920-5861(00)00247-9

Cited by 168 publications

(97 citation statements)

References 26 publications

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“…Using photocatalysts to degrade organic compounds on surfaces has attracted considerable attention in the [36][37][38]. Protons formed by the reaction between holes and water, as well as organic compounds, are reduced by electrons injected previously into the metal nanoparticles recent years, due to possible applications in selfcleaning coatings and antimicrobial surfaces [39][40][41][42].…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic activity of TiO2 nanofibers and their flexible composite films: Decomposition of organic dyes and efficient H2 generation from ethanol-water mixtures

et al. 2011

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TiO 2 nanofibers decorated with Pt and Pd nanoparticles have been synthesized and studied in various photocatalytic processes. Excellent photocatalytic behavior in the decomposition of organic dyes in water, degradation of organic stains on the surface of flexible freestanding cellulose/catalyst composite films and in generation of hydrogen from ethanol using both suspended and immobilized catalysts are demonstrated. The performance of the nanofiber-based TiO 2 materials is competitive with-and in some cases outperforms-their conventional nanoparticle-based counterparts. In all cases, Pd-decorated TiO 2 nanoparticles and nanofibers proved to be more efficient than their Pt-based counterparts, which could be explained on the basis of the formation of nano-sized Schottky interfaces at the contacts between TiO 2 and metal nanoparticles. The feasibility of forming cellulose/catalyst composites provides a novel way of utilizing photocatalyst materials in large-area coatings and freestanding films.

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Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic activity of TiO2 nanofibers and their flexible composite films: Decomposition of organic dyes and efficient H2 generation from ethanol-water mixtures

et al. 2011

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“…It was confirmed that Pt-loaded photocatalysts such as PtTiO 2 could not split water into H 2 and O 2 in a simple aqueous suspension system, because the H 2 and O 2 produced over the photocatalyst rapidly react back to H 2 O on Pt surface before they escape from the suspension to gas phase. 8,9,175 The Z-scheme water-splitting system based on IO 3 ¹ /I ¹ redox couple, however, can generate H 2 and O 2 simultaneously even in the presence of Pt cocatalyst on the anatase TiO 2 photocatalyst. It was found that the iodide (I ¹ ) anion was adsorbed preferentially onto Pt cocatalyst and spontaneously formed an iodine layer, which effectively suppressed the backward reaction of water formation.…”

Section: Suppression Of Backward Water Formation By Iodidementioning

confidence: 99%

“…The rate of gas evolution gradually decreased with gas accumulation in the closed system, possibly because the backward reaction from the evolved H 2 and O 2 into H 2 O also proceeded on Pt metal cocatalyst particles. 8,9,175 However, the initial rate of gas evolution was recovered by the evacuation of accumulated gases. When a 200 h long-term photoirradiation was carried out in an aqueous solution of NaI (40 mM, pH 11) with periodical evacuation of gas phase, the total amount of H 2 and O 2 reached ca.…”

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confidence: 99%

Development of a New System for Photocatalytic Water Splitting into H2 and O2 under Visible Light Irradiation

Abe¹

2011

Bulletin of the Chemical Society of Japan

146

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Photocatalytic water splitting using semiconductor materials has attracted considerable interest due to its potential for clean production of H 2 from water by utilizing abundant solar light. The developments of water-splitting systems that can efficiently use visible light have been a major challenge for many years in order to realize efficient conversion of solar light. We have developed a new type of photocatalysis system that can split water into H 2 and O 2 under visible light irradiation, which was inspired by the two-step photoexcitation (Z-scheme) mechanism of natural photosynthesis in green plants. In this system, the water-splitting reaction is broken up into two stages: one for H 2 evolution and the other for O 2 evolution; these are combined by using a shuttle redox couple (Red/Ox) in the solution. The introduction of a Z-scheme mechanism reduces the energy required to drive each photocatalysis process, extending the usable wavelengths significantly (μ660 nm for H 2 evolution and μ600 nm for O 2 evolution) from that in conventional water splitting systems (μ460 nm) based on one-step photoexcitation in single semiconductor material.

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“…Metal olmayan katkılar arasında, bor katkılı TiO 2 hakkında oldukça kısıtlı sayıda çalışma bulunmakta ve mevcut sonuçlar, borun fotokatalik aktiviteye etkisi konusunda farklılıklar göstermektedir. Yapılan bazı çalışmalarda, bor katkısının soğurma sınırını daha yüksek dalgaboylarına ötelediği ve görünür ışık altında soğurmanın arttığı belirlenmiştir (Lu et al 2007;Moon et al 2000;Su et al 2007). Ancak, Zaleska ve ark.…”

Section: Introductionunclassified

Investigation of Photocatalytic Activity of Sol-gel Derived Boron and/or Nitrogen Doped TiO2 Powder and Thin Films Under UV and Visible Light

Ersundu¹

2017

AKU-J. Sci. Eng.

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ÖzetBu çalışmada, farklı oranlarda B, N, B/N katkılı ve katkısız TiO 2 fotokatalistleri sol-jel yöntemi ile toz ve ince film formunda üretilmiştir. İnce filmler daldırmalı kaplama yöntemi ile kaplamasız ve SiO 2 ara katman kaplamalı soda kireç cam altlıklar üzerine kaplanmıştır. SiO 2 ara katman kaplamalar, TiO 2 'nin ısıl işlemi sırasında altlık malzeme olarak kullanılan soda-kireç camındaki alkali iyonların film içine difüze ederek TiO 2 'nin faz dönüşümünü engellemesini ve fotokatalitik aktivitesini düşürmesini önlemek amacıyla uygulanmıştır. Katkılı ve katkısız TiO 2 esaslı çözeltilerden elde edilen jellerin ısıl karakterizasyonları termogravimetrik diferansiyel termal analiz (TG/DTA) yöntemi ile gerçekleştirilmiştir. Elde edilen TG/DTA sonuçları ışığında, TiO 2 'nin fotokatalitik aktivitesi en yüksek olan anataz fazının kristalizasyon sıcaklığı belirlenmiştir. Anataz fazının kristalizasyon sıcaklığı ve cam altlık malzemenin cam geçiş sıcaklığı göz önünde bulundurularak, fotokatalistler hava ortamında 500 °C'de 1 saat ısıl işleme tabi tutulmuş ve fırın içerisinde oda sıcaklığına soğutulmuştur. Toz haldeki fotokatalistlerin faz karakterizasyonları X-ışınları difraksiyonu (XRD) tekniği ile, ince filmlerin optik karakterizasyonları ise UV-Vis spektrofotometre yöntemi ile gerçekleştirilmiştir. TiO 2 yapısında katkı olarak B ve N'nin ayrı ayrı ve eşzamanlı bulunmasının mor ötesi ve görünür ışık fotokatalitik aktivitesine etkisi, organik bir kirlilik olan metilen mavisinin bozunması ile tespit edilmiştir. Metilen mavisinin bozunmasıyla fotokatalitik aktivite kinetik açıdan incelenmiş ve fotokatalistlerin fotokatalitik aktivite hız sabitleri hesaplanmıştır. Investigation of Photocatalytic Activity of Sol-gel Derived Boron and/or Nitrogen Doped TiO 2 Powder and Thin Films Under UV and Visible LightKeywords TiO 2 ; Sol-gel; Thin film; Photocatalytic activity AbstractIn this study, B, N, B/N doped and bare TiO 2 photocatalysts were synthesized in powder and thin film form using sol-gel method. Thin films were dip-coated on bare and SiO 2 precoated soda-lime glass substrates. The alkali ions in the glass structure suppress crystallization of TiO 2 and degrade the photocatalytic activity; therefore SiO 2 coating was applied as an interlayer to prevent alkali ion diffusion into sol-gel prepared thin film during heat-treatment process. Thermal characterizations of doped and undoped gels obtained from different TiO 2 -based sols were carried out using thermogravimetric differential thermal analysis technique (TG/DTA). According to the TG/DTA results, crystallization temperature of anatase phase, which has the highest photocatalytic activity among all TiO 2 polymorphs, was determined. Considering the crystallization temperature of anatase and glass transition temperature of substrates, the samples were heat-treated at 500 °C in air, waited 1 hour at this temperature and cooled down to room temperature in the furnace. Phase analysis was realized with powder samples using X-ray diffraction (XRD) analysis and optical spectra o...

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Photocatalytic production of hydrogen from water using TiO2 and B/TiO2

Cited by 168 publications

References 26 publications

Enhanced photocatalytic activity of TiO2 nanofibers and their flexible composite films: Decomposition of organic dyes and efficient H2 generation from ethanol-water mixtures

Enhanced photocatalytic activity of TiO2 nanofibers and their flexible composite films: Decomposition of organic dyes and efficient H2 generation from ethanol-water mixtures

Development of a New System for Photocatalytic Water Splitting into H2 and O2 under Visible Light Irradiation

Investigation of Photocatalytic Activity of Sol-gel Derived Boron and/or Nitrogen Doped TiO2 Powder and Thin Films Under UV and Visible Light

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