Photocatalytic Water Splitting over Highly Donor-Doped (110) Layered Perovskites

Hwang, Dong Won; Kim, Hyun Gyu; Kim, Jindo; Yong, Kyung; Kim, Young Gul; Lee, Jae Sung

doi:10.1006/jcat.2000.2875

Cited by 168 publications

(71 citation statements)

References 25 publications

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“…The quantum yield is more meaningful than H 2 evolution rate to evaluate the performance of photocatalyst since the rate is normalized against the absorbed photons [15]. The apparent quantum yield was determined as below:…”

Section: Methodsmentioning

confidence: 99%

Effects of Cocatalyst and Calcination Temperature on Photocatalytic Hydrogen Evolution Over BaTi4O9 Powder Synthesized by the Polymerized Complex Method

et al. 2008

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BaTi 4 O 9 powders with improved crystal perfection and relatively large surface area were synthesized by the polymerized complex (PC) method calcined at reduced temperatures (700-1,000°C) relative to the solidstate reaction (SSR) method. BaTi 4 O 9 with a unique pentagonal-prism tunnel structure, combined with different cocatalysts (Pt, Ru, Ni, Cu, Co) as promoters, was investigated towards photocatalytic reactions for H 2 evolution from pure water and aqueous ethanol solution. Pt/BaTi 4 O 9 achieved the highest activity from ethanol solution, and subsequently it was focused to study the effect of calcination temperature on photocatalytic activities. The maximum quantum yield for H 2 evolution from pure water and ethanol solution was obtained at 700 and 800°C separately, with the value of 0.9% and 11.7% over Pt/BaTi 4 O 9 photocatalysts.

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Section: Methodsmentioning

confidence: 99%

Effects of Cocatalyst and Calcination Temperature on Photocatalytic Hydrogen Evolution Over BaTi4O9 Powder Synthesized by the Polymerized Complex Method

et al. 2008

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“…The amount of evolved H 2 was determined by gas chromatography (Shimazu GC-14B; TDX-01 column, TCD, Ar carrier) through a gas sampler (0.5 ml) which was directly connected to the reaction system. The quantum yield is the more meaningful parameter than the rate of H 2 evolution itself to gauge the performance of a photocatalyst because the rate is normalized against the absorbed photons [1]. The apparent quantum yield was determined as below.…”

Section: Methodsmentioning

confidence: 99%

“…Perovskite-type oxide materials based on transition metals with d(0) electron configuration such as Ti(IV), Nb(V) and Ta(V) have been investigated as efficient photocatalysts for photodecomposition of water under UV irradiations [1][2][3][4][5][6][7]. CaTiO 3 is one of the alkaline earth titanates with perovskite structure such as SrTiO 3 and BaTiO 3 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Hydrogen Evolution Over CaTi1−x Zr x O3 Composites Synthesized by Polymerized Complex Method

et al. 2007

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The solid solution of CaTi 1-x Zr x O 3 (x = 0-0.15) was successfully synthesized by the polymerized complex (PC) method. This study has exhibited the advantage of the PC method to prepare a highly active CaTiO 3 compared with the conventional solid-state reaction (SSR) method. More importantly, further improvement in phase purity and large surface area was achieved by the doping of Zr 4+ , leading to remarkable enhancement of photocatalytic activities compared to pure CaTiO 3 . The quantum yield for H 2 evolution over the most active photocatalyst, Pt (1.0 wt%)/CaTi 0.93 Zr 0.07 O 3 , was 1.91% and 13.3% in photoreactions from pure water and aqueous ethanol solution, respectively for 0.1 g photocatalyst, which was about 3.3 and 2.5 times compared to that of PCderived CaTiO 3 .

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“…We also have reported that (110) layered perovskite materials, a series of homologous structures with a generic composition of A m B m O 3m+2 (m=4, 5; A=Ca, Sr, La; B=Nb, Ti, Ta) are highly active photocatalysts that promote overall water splitting into a stoichiometric mixture of H 2 and O 2 (2:1 by volume) under UV light [5][6][7][8][9][10][11][12][13]. Unlike the more common (100) layered perovskite materials [2,14,15], our materials have layers parallel to (110) surface of the perovskite structure.…”

Section: Introductionmentioning

confidence: 96%

Photocatalytic Water Splitting Under Visible Light with Particulate Semiconductor Catalysts

2005

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Photocatalytic water splitting (PWS) is the most promising technology to produce H 2 energy directly from renewable water and solar light. PWS has made a remarkable progress last decades under ultra-violet (UV) light, but there are many technical challenges remaining for PWS under visible light. Several approaches are taken in search of photocatalysts efficient for PWS under visible light: (i) to find new single phase materials, (ii) to decorate UV-active photocatalysts with a photosensitizer absorbing visible light, (iii) to tune the band gap energy by modifying cations or anions of UV-active photocatalysts with substitutional doping, and (iv) to fabricate multi-component photocatalysts by forming composites or solid solutions. This article discusses the above approaches based on our experimental results as well as data available in the literature. At the moment, the greatest challenge to the progress of visible light PWS is the low efficiency of light utilization. Finding new photocatalytic materials with unique structure and phase is still the key to the success. In addition, the synthesis of these materials with high crystallinity and high surface area is also important, because these properties exert great impact on the activity of the material of the same structure and phase. Finally, smart combination and modification of known materials could also be fruitful.

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Photocatalytic Water Splitting over Highly Donor-Doped (110) Layered Perovskites

Cited by 168 publications

References 25 publications

Effects of Cocatalyst and Calcination Temperature on Photocatalytic Hydrogen Evolution Over BaTi4O9 Powder Synthesized by the Polymerized Complex Method

Effects of Cocatalyst and Calcination Temperature on Photocatalytic Hydrogen Evolution Over BaTi4O9 Powder Synthesized by the Polymerized Complex Method

Enhanced Photocatalytic Hydrogen Evolution Over CaTi1−x Zr x O3 Composites Synthesized by Polymerized Complex Method

Photocatalytic Water Splitting Under Visible Light with Particulate Semiconductor Catalysts

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