A visible light responsive rhodium and antimony-codoped SrTiO<sub>3</sub> powdered photocatalyst loaded with an IrO<sub>2</sub> cocatalyst for solar water splitting

Asai, Rikako; Nemoto, Hiroaki; Jia, Qingbo; Saito, Kenji; Iwase, Akihide; Kudo, Akihiko

doi:10.1039/c3cc49279f

Cited by 210 publications

(142 citation statements)

References 23 publications

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“…Overall water splitting was also achieved under visible light using rhodium-and antimony-codoped SrTiO 3 (SrTiO 3 :Rh,Sb) loaded with IrO 2 , RuO 2 , or Ru as cocatalysts [58]. Among the three cocatalysts, IrO 2 produced the highest activity for overall water splitting.…”

Section: Doped Srtio 3 Photocatalystsmentioning

confidence: 99%

Photocatalytic Water-Splitting Reaction from Catalytic and Kinetic Perspectives

2014

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Some particulate semiconductors loaded with nanoparticulate catalysts exhibit photocatalytic activity for the water-splitting reaction. The photocatalysis is distinct from the thermal catalysis because photocatalysis involves photophysical processes in particulate semiconductors. This review article presents a brief introduction to photocatalysis, followed by kinetic aspects of the photocatalytic water-splitting reaction.

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Section: Doped Srtio 3 Photocatalystsmentioning

confidence: 99%

Photocatalytic Water-Splitting Reaction from Catalytic and Kinetic Perspectives

2014

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“…28,37 This is due to similarity in the ionic size of Rh (R Rh +4 = 0.60 Å) with Ti (R Ti +4 = 0.605 Å) than with Sr (R Sr +2 = 1.44 Å). 54 Hence, in this study the Rh-doped…”

Section: Resultsmentioning

confidence: 93%

Role of F in Improving the Photocatalytic Activity of Rh-Doped SrTiO₃

Modak

Ghosh

2015

J. Phys. Chem. C

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In this study, the effect of F doping on the electronic structure and photocatalytic activity of Rh-doped SrTiO 3 has been investigated using hybrid density functional theory as a tool. Although doping with only Rh significantly enhances the visible light activity, the photoconversion efficiency has been found to be poor. This is due to the Rh 4+ state, which introduces localized unoccupied states above the valence band and promotes the electron−hole recombination process. Upon codoping with F, the localized states are found to be completely passivated. Analysis of Bader charge indicates the existence of the lower oxidation state of Rh in the (Rh, F)codoped SrTiO 3 . The valence band maxima are elevated significantly due to strong hybridization of the O 2p orbital and Rh 4d orbital, resulting in band gap narrowing to 2.50 eV. The nature of the band structure of (Rh, F)codoped SrTiO 3 is found to be strongly dependent on the relative proportion of the dopant elements. 1:2 (Rh, F) codoping not only results in a clean band structure but also reduces the band gap by a larger extent (0.88 eV). In the case of 2:1 (Rh, F)-codoping, localized unoccupied states in the forbidden region are still present. Calculation of the defect formation energy indicates that the doping of Rh becomes more feasible in the presence of F. The relative locations of the band edge for both 1:1 and 1:2 (Rh, F)-codoped SrTiO 3 are found to be suitable for the overall water splitting process. Hence, introduction of F is expected to enhance the photocatalytic activity of Rh-doped SrTiO 3 under visible light due to narrowing of the band gap as well as lowering of the electron−hole recombination rate.

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“…Traditional photocatalysts operating in the UV-light spectrum that have been developed for this purpose are wide band gap oxide semiconductors [1]. A variety of visible spectrum photocatalysts capable of water splitting have already been proposed [2,3]. Oxynitride materials that possess smaller band gaps have been investigated as a promising alternative to the semiconductor oxides [4] for water splitting and, recently, a promising photocatalyst has been proposed as a solid solution between ZnO and GaN [5].…”

Section: Introductionmentioning

confidence: 99%

Double bubble secondary building units used as a structural motif for enhanced electron–hole separation in solids

Farrow

Catlow

Sokol

et al. 2016

Materials Science in Semiconductor Processing

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a b s t r a c tA structural motif designed for enhancing electron-hole separation in semiconducting composite materials, the so-called double bubble, is introduced. The addition of silicon carbide in the construction of heterogeneous double bubble systems, along with zinc oxide and gallium nitride, yields electronic structures that are favourable for electron-hole separation. The standard formation enthalpies of such systems are comparable with those of fullerenes, suggesting that these systems would be achievable and of direct benefit to photovoltaic and electrochemical applications such as water splitting; with the (SiC) 12 @(ZnO) 48 proving to be the most promising building block for future functional composite materials.

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A visible light responsive rhodium and antimony-codoped SrTiO₃ powdered photocatalyst loaded with an IrO₂ cocatalyst for solar water splitting

Cited by 210 publications

References 23 publications

Photocatalytic Water-Splitting Reaction from Catalytic and Kinetic Perspectives

Photocatalytic Water-Splitting Reaction from Catalytic and Kinetic Perspectives

Role of F in Improving the Photocatalytic Activity of Rh-Doped SrTiO₃

Double bubble secondary building units used as a structural motif for enhanced electron–hole separation in solids

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A visible light responsive rhodium and antimony-codoped SrTiO3 powdered photocatalyst loaded with an IrO2 cocatalyst for solar water splitting

Cited by 210 publications

References 23 publications

Photocatalytic Water-Splitting Reaction from Catalytic and Kinetic Perspectives

Photocatalytic Water-Splitting Reaction from Catalytic and Kinetic Perspectives

Role of F in Improving the Photocatalytic Activity of Rh-Doped SrTiO3

Double bubble secondary building units used as a structural motif for enhanced electron–hole separation in solids

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Product

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A visible light responsive rhodium and antimony-codoped SrTiO₃ powdered photocatalyst loaded with an IrO₂ cocatalyst for solar water splitting

Role of F in Improving the Photocatalytic Activity of Rh-Doped SrTiO₃