Oxysulfide photocatalyst for visible-light-driven overall water splitting

Wang, Qian; Nakabayashi, Mamiko; Hisatomi, Takashi; Sun, Song; Akiyama, Seiji; Wang, Zheng; Pan, Zhenhua; Xiao, Xinyan; Watanabe, Tomoaki; Yamada, Taro; Shibata, Naoya; Takata, Tsuyoshi; Domen, Kazunari

doi:10.1038/s41563-019-0399-z

Cited by 501 publications

(378 citation statements)

References 29 publications

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“…[5] Theb and gap of this material is 1.9 eV (corresponding to an absorption band edge of 650 nm), which is narrower than that of Sm 2 Ti 2 S 2 O 5 (2.1 eV) because Y3do rbitals also contribute to the VBM (Figure 1a). Arecent breakthrough in the development of oxysulfides for photocatalytic water splitting-namely Y 2 Ti 2 O 5 S 2 -has been discovered by Domen and co-workers.…”

Section: Methodsmentioning

confidence: 87%

Oxysulfide Semiconductors for Photocatalytic Overall Water Splitting with Visible Light

2019

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Photocatalytic overall water splitting by sulfidebased materials is ag reat challenge because of the poor resilience of such materials against hole oxidation. In arecent study,D omen and co-workers developed an innovative strategy to stabilizesulfide-based photocatalysts by hybridizing S3pwith O2porbitals to produce oxysulfides in whichS 2À is stable.Further surface engineering of the oxysulfides with dual co-catalysts promoted charge separation and interface transfer, thus reducing the charge build-up that inhibits photocorrosion. The pH value of the reaction mixture is acritical consideration for achieving efficient stoichiometric H 2 and O 2 evolution by these oxysulfide photocatalysts. Solar hydrogen production by photocatalytic water splitting has long been regarded as apromising method for generation of chemicals from sunlight and water. [1] In particular, the use of nanocrystal photocatalysts for visible-light-driven water splitting via single photoexcitation is of interest because of the simplicity of the system. However, such systems tend to offer low quantum efficiencies.T he development of narrow band gap photocatalysts capable of splitting water under visiblelight irradiation is regarded as ak ey goal. Firstly,t oa chieve ag oal of 10 %e nergy-conversion efficiency (that is,c omparable to traditional fossil-based H 2 production), photocatalysts with an arrow band gap (ideally 1.8-2.0 eV) are necessary to capture solar energy efficiently.A ppropriate band alignment, where the potentials match the associated water redox reactions,i sr equired to drive the up-hill watersplitting reaction. Moreover,p articulate photocatalysts should be durable enough against corrosion by light, or in solution, because self-oxidation of photocatalysts by excited holes is ap rimary competing process with water oxidation.Metal chalcogenides (for example,CdS and ZnS) usually have narrow band gaps in comparison with their oxide counterparts because of the lower electronegativity of sulfur compared to oxygen, and they have shown very good photocatalytic and photoelectrochemical activities. [2,3] For instance,b yd epositing Pt nanoparticle at the tip of CdS nanorods,t he apparent quantum yield (AQY) for visiblelight-driven H 2 production reached 0.9 in the presence of as acrificial donor (to neutralize photogenerated holes). [3a] TheA QY for H 2 production approached 1w hen CdSe dots were embedded in the nanorod to help localize excited holes; however, sacrificial agents were still necessary. [3b] Interestingly,s imultaneous H 2 and O 2 production by CdS nanorods decorated with reductive (nanoparticles) and oxidative (molecular) co-catalysts was achieved in pure water, but the H 2 /O 2 ratio was far from as toichiometric value of 2b ecause the lattice sulfide ions,o rt he thiol group of the stabilizing ligands,were prone to oxidation by the holes.Either way,the photocatalysts were damaged and the overall efficiencies were reduced. [3c] Theincorporation of sulfide ions into the lattice of metal oxides,toform oxysulfides,isex...

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Section: Methodsmentioning

confidence: 87%

Oxysulfide Semiconductors for Photocatalytic Overall Water Splitting with Visible Light

2019

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“…16) and Y 2 Ti 2 O 5 S 2 (ref. 17) show activities for one-step photoexcitation type water splitting under visible light irradiation. We have also reported that Rh,Sb-codoped SrTiO 3 of a metal oxide photocatalyst shows the water splitting activity under visible light irradiation by loading of an IrO 2 cocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Solar water splitting over Rh_0.5Cr_1.5O₃-loaded AgTaO₃ of a valence-band-controlled metal oxide photocatalyst

2020

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“…Photocatalytic technology is a crucial and well‐accepted strategy to exploit and utilize solar energy, which exhibits great potential in alleviating global environmental pollutions and energy crisis 1–3. Photocatalytic water splitting for hydrogen evolution has attracted more and more attentions, since hydrogen is a clean and renewable fuel with high energy density 4–6.…”

Section: Figurementioning

confidence: 99%

Construction of Infrared‐Light‐Responsive Photoinduced Carriers Driver for Enhanced Photocatalytic Hydrogen Evolution

et al. 2020

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Infrared light, more than 50% of the solar light energy, is long‐termly ignored in the photocatalysis field due to its low photon energy. Herein, infrared‐light‐responsive photoinduced carriers driver is first constructed taking advantage of pyroelectric effect for enhancing photocatalytic hydrogen evolution. In order to give full play to its role, the photocatalytic reaction is localized on the surface and interface of the composite based on a new semi‐immersion type heat collected photocatalytic microfiber system. The system is consisted of distinctive pyroelectric substrate poly(vinylidene fluoride‐co‐hexafluropropylene (PVDF‐HFP), typical photothermal material carbon nanotube (CNT), and representative photocatalyst CdS. The transient photocurrent, electrochemical impedance spectroscopy, time‐resolved photoluminescence and pyroelectric potential characterizations indicate that the infrared‐light‐responsive carriers driver significantly promotes the photogenerated charge separation, accelerates carrier migration, and prolongs carrier lifetime. The photocatalytic hydrogen evolution efficiency is remarkably improved more than five times with the highest average apparent quantum yield of 16.9%. It may open up new horizons to photocatalytic technology for the more efficient use of infrared light.

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Oxysulfide photocatalyst for visible-light-driven overall water splitting

Cited by 501 publications

References 29 publications

Oxysulfide Semiconductors for Photocatalytic Overall Water Splitting with Visible Light

Oxysulfide Semiconductors for Photocatalytic Overall Water Splitting with Visible Light

Solar water splitting over Rh_0.5Cr_1.5O₃-loaded AgTaO₃ of a valence-band-controlled metal oxide photocatalyst

Construction of Infrared‐Light‐Responsive Photoinduced Carriers Driver for Enhanced Photocatalytic Hydrogen Evolution

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Oxysulfide photocatalyst for visible-light-driven overall water splitting

Cited by 501 publications

References 29 publications

Oxysulfide Semiconductors for Photocatalytic Overall Water Splitting with Visible Light

Oxysulfide Semiconductors for Photocatalytic Overall Water Splitting with Visible Light

Solar water splitting over Rh0.5Cr1.5O3-loaded AgTaO3 of a valence-band-controlled metal oxide photocatalyst

Construction of Infrared‐Light‐Responsive Photoinduced Carriers Driver for Enhanced Photocatalytic Hydrogen Evolution

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Solar water splitting over Rh_0.5Cr_1.5O₃-loaded AgTaO₃ of a valence-band-controlled metal oxide photocatalyst