Overall Water Splitting by RuO2-loaded Hexagonal YInO3 with a Distorted Trigonal Bipyramid

Arai, Naoki; Saito, Nobuo; Nishiyama, Hiroshi; Shimodaira, Yoshiki; Kobayashi, Hisayoshi; Inoue, Y.; Sato, Kazunori

doi:10.1246/cl.2008.46

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…Precise control over the bandgaps and band-edge positions of semiconductors intended for single photoexcitation-based water splitting has been achieved using the solid-solution approach. Many materials have been studied in this regard, including Sr 2 Nb x Ta 2– x O 7 , Y x In 2– x O 3 , , Sc x In 2– x O 3 , BiYWO 6 , (Ga 1– x Zn x )(N 1– x O x ), ,− ZnO/GaN-P, (Zn 1+ x Ge)(N 2 O x ), , Li 1– x Cu x Nb 3 O 8 , BaZr 1– x Sn x O 3 , Bi x Y 1– x MO 4 (M = La, Eu, Sm, Y, Dy, Nd and Gd), ,,, and LaMg x Ta 1– x O 1+3 x N 2–3 x . − In particular, our own group reported work with GaN:ZnO solid solutions in 2005, representing the first example of efficient and stable visible-light-driven overall water splitting among semiconductors having a bandgap smaller than 3 eV. ,,, The absorption of light by both GaN and ZnO is restricted to the UV region by their wide bandgaps (3.4 and 3.2 eV, respectively). However, a solid solution of GaN and ZnO has a bandgap smaller than those of either of the two, with an estimated value of approximately 2.6 eV.…”

Section: Photon Absorptionmentioning

confidence: 99%

Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies

2019

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Solar-driven water splitting provides a leading approach to store the abundant yet intermittent solar energy and produce hydrogen as a clean and sustainable energy carrier. A straightforward route to light-driven water splitting is to apply self-supported particulate photocatalysts, which is expected to allow solar hydrogen to be competitive with fossil-fuel-derived hydrogen on a levelized cost basis. More importantly, the powder-based systems can lend themselves to making functional panels on a large scale while retaining the intrinsic activity of the photocatalyst. However, all attempts to generate hydrogen via powder-based solar water-splitting systems to date have unfortunately fallen short of the efficiency values required for practical applications. Photocatalysis on photocatalyst particles involves three sequential steps: (i) absorption of photons with higher energies than the bandgap of the photocatalysts, leading to the excitation of electron–hole pairs in the particles, (ii) charge separation and migration of these photoexcited carriers, and (iii) surface chemical reactions based on these carriers. In this review, we focus on the challenges of each step and summarize material design strategies to overcome the obstacles and limitations. This review illustrates that it is possible to employ the fundamental principles underlying photosynthesis and the tools of chemical and materials science to design and prepare photocatalysts for overall water splitting.

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Section: Photon Absorptionmentioning

confidence: 99%

Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies

2019

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“…There is only a single report that shows the Raman spectrum of YInO 3 to the best of our knowledge. However, its crystal structure resembles YMnO 3 (both of these are LuMnO 3 -type), which is a well-studied multiferroic system crystallizing in the P 6 3 cm lattice.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Synthesis and Structural and Electrical Investigations of a Hexagonal Y_1–xGd_xInO₃ (0.0 ≤ x ≤ 1.0) System Obtained via Metastable C-Type Intermediates

et al. 2013

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Detailed structural and electrical investigations were carried out on an A-site disordered hexagonal Y(1-x)Gd(x)InO3 (0.0 ≤ x ≤ 1.0) series synthesized by a self-assisted gel-combustion route. The phase relations show profound temperature dependence. The metastable C-type modification could be stabilized for all the compositions, which on further heating get converted to stable hexagonal polymorphs. The conversion temperature (C-type to hexagonal) was found to increase with an increase in Y(3+) content. The system was observed to be single-phasic hexagonal at 1250 °C throughout the composition range. Interestingly, the increase in planar bonds of InO5 polyhedra was found to be twice that of the apical bonds on Gd(3+) substitution. Careful Raman spectroscopic studies highlighted a definitive though subtle structural change from x = 0.7 onward. The same observation is also corroborated by the dielectric studies. Electric field-dependent polarization measurements showed the ferroelectric hysteresis loop for pure YInO3. The system transforms from ferroelectric in YInO3 to almost paraelectric for GdInO3. In the present study, XRD, Raman, and electrical characterizations in conjunction reveal that to tune the electrical properties of the hexagonal rare earth indates, the variation in tilting of InO5 polyhedra has to be influenced, which could not be brought about by isovalent A-site substitution.

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“…However, the optical absorption of this material is fairly weak in the visible region. 5,6 In this work, the addition of graphene can narrow the band gap of YInO 3 to visible wavelengths and prolong the separation and lifetime of electron-hole pairs by the chemical bonding between YInO 3 and graphene. Signicantly enhanced performance for hydrogen evolution was achieved when graphene was used as the cocatalyst.…”

Section: Introductionmentioning

confidence: 97%

Highly efficient photocatalytic hydrogen evolution of graphene/YInO3 nanocomposites under visible light irradiation

et al. 2014

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Visible-light-driven hydrogen evolution with high efficiency is important in the current photocatalysis research. Here we report for the first time the design and synthesis of a new graphene-semiconductor nanocomposite consisting of YInO3 nanoparticles and two-dimensional graphene sheets as efficient photocatalysts for hydrogen evolution under visible light irradiation. The graphene/YInO3 nanocomposites were synthesized using a facile solvothermal method in which the formation of graphene and the deposition of YInO3 nanoparticles on the graphene sheets can be achieved simultaneously. The addition of graphene as a cocatalyst can narrow the band gap of YInO3 to visible photon energy and prolong the separation and lifetime of electron-hole pairs by the chemical bonding between YInO3 and graphene. The photocatalytic reaction with this nanocomposite reaches a high H2 evolution rate of 400.4 μmol h(-1) g(-1) when the content of graphene is 0.5 wt%, over 127 and 3.7 times higher than that of pure YInO3 and Pt/YInO3, respectively. This work can provide an effective approach to the fabrication of graphene-based photocatalysts with high performance in the field of energy conversion.

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Overall Water Splitting by RuO2-loaded Hexagonal YInO3 with a Distorted Trigonal Bipyramid

Abstract: RuO2-loaded hexagonal YInO3 consisting of a distorted InO5 trigonal bipyramid was found to be photocatalytically active in the water-splitting reaction. The characteristic role of the InO5 structure in the photocatalytic performance is described.

Cited by 7 publications

References 4 publications

Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies

Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies

Synthesis and Structural and Electrical Investigations of a Hexagonal Y_1–xGd_xInO₃ (0.0 ≤ x ≤ 1.0) System Obtained via Metastable C-Type Intermediates

Highly efficient photocatalytic hydrogen evolution of graphene/YInO3 nanocomposites under visible light irradiation

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Overall Water Splitting by RuO2-loaded Hexagonal YInO3 with a Distorted Trigonal Bipyramid

Abstract: RuO2-loaded hexagonal YInO3 consisting of a distorted InO5 trigonal bipyramid was found to be photocatalytically active in the water-splitting reaction. The characteristic role of the InO5 structure in the photocatalytic performance is described.

Cited by 7 publications

References 4 publications

Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies

Particulate Photocatalysts for Light-Driven Water Splitting: Mechanisms, Challenges, and Design Strategies

Synthesis and Structural and Electrical Investigations of a Hexagonal Y1–xGdxInO3 (0.0 ≤ x ≤ 1.0) System Obtained via Metastable C-Type Intermediates

Highly efficient photocatalytic hydrogen evolution of graphene/YInO3 nanocomposites under visible light irradiation

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Synthesis and Structural and Electrical Investigations of a Hexagonal Y_1–xGd_xInO₃ (0.0 ≤ x ≤ 1.0) System Obtained via Metastable C-Type Intermediates