Sunlight‐Driven Overall Water Splitting by the Combination of Surface‐Modified La5Ti2Cu0.9Ag0.1S5O7 and BaTaO2N Photoelectrodes

Higashi, Tomohiro; Shinohara, Yuki; Ohnishi, Atsushi; Liu, Jingyuan; Ueda, Koichiro; Okamura, Shöji; Hisatomi, Takashi; Katayama, Masao; Nishiyama, Hiroshi; Yamada, Taro; Minegishi, Tsutomu; Domen, Kazunari

doi:10.1002/cptc.201600015

Cited by 39 publications

(54 citation statements)

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“…A typical PEC cell is composed of a photoanode and a photocathode that are electrically connected to one another and immersed in an aqueous electrolyte solution . The solar‐to‐hydrogen energy conversion efficiency (STH) of a PEC cell is maximized by adjusting the light‐receiving area and the common operational potential of both photoelectrodes in order to balance the photocurrent from each . A PEC cell having a tandem configuration in conjunction with a stacked structure, incorporating a front side transparent photoelectrode along with a second photoelectrode that responds to the light transmitted through the front side photoelectrode, could potentially allow efficient water splitting .…”

Section: Figurementioning

confidence: 99%

Transparent Ta₃N₅ Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

et al. 2019

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Photoelectrochemical water splitting is regarded as ap romising approacht ot he production of hydrogen, and the development of efficient photoelectrodes is one aspect of realizing practical systems.I nt his work, transparent Ta 3 N 5 photoanodes were fabricated on n-type GaN/sapphire substrates to promote O 2 evolution in tandem with aphotocathode, to realize overall water splitting.F ollowing the incorporation of an underlying GaN layer,aphotocurrent of 6.3 mA cm À2 was achieved at 1.23 Vvs. areversible hydrogen electrode.The transparency of Ta 3 N 5 to wavelengths longer than 600 nm allowed incoming solar light to be transmitted to aC uInSe 2 (CIS), whicha bsorbs up to 1100 nm. As tand-alone tandem cell with as erially-connected dual-CIS unit terminated with aP t/Ni electrode was thus constructed for H 2 evolution. This tandem cell exhibited as olar-to-hydrogen energy conversion efficiency greater than 7% at the initial stage of the reaction.Hydrogen generation from water utilizing solar energy is one of the most promising means of producing hydrogen as ac lean, transportable and renewable energy. [1] In addition, overall water splitting using photoelectrochemical (PEC) cells is regarded as ap referable method of converting solar energy to obtain hydrogen. Atypical PEC cell is composed of ap hotoanode and ap hotocathode that are electrically connected to one another and immersed in an aqueous electrolyte solution. [2] Thes olar-to-hydrogen energy conversion efficiency(STH) of aPEC cell is maximized by adjusting the light-receiving area and the common operational potential of both photoelectrodes in order to balance the photocurrent from each. [1a, 2c, 3] AP EC cell having at andem configuration in conjunction with as tacked structure,i ncorporating af ront side transparent photoelectrode along with asecond photoelectrode that responds to the light transmitted through the front side photoelectrode,could potentially allow efficient water splitting. [4] Thed evelopment of transparent photoelectrodes is thus ap rerequisite for constructing such devices.PEC water splitting using Ta 3 N 5 -based photoanodes has been extensively investigated because the band structure of this material is well-suited to water splitting. [5] Liu et al. demonstrated that aT a 3 N 5 -based photoanode can generate ac urrent density of 12.1 mA cm À2 at 1.23 Vv s. ar eversible hydrogen electrode (RHE) under simulated sunlight. [6] This value is close to the theoretical limiting current density under 1s un illumination (12.9 mA cm À2 )e stimated from the band gap of Ta 3 N 5 .O ur own group has previously reported that ap hotoanode based on aT a 3 N 5 thin film prepared on aT a metal substrate can produce 7.5 mA cm À2 at 1.23 Vv s. RHE under simulated sunlight. [7] To date,t here have been few reports of PEC oxygen evolution using transparent Ta 3 N 5 -based photoanodes.H ajibabaei et al. recently reported at ransparent Ta 3 N 5 photoanode prepared on aT a-doped TiO 2 -coated SiO 2 (Ta-TiO 2 / SiO 2 )s ubstrate. [8] This Ta 3 N 5 /Ta-TiO ...

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Section: Figurementioning

confidence: 99%

Transparent Ta₃N₅ Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

et al. 2019

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“…Oxysulfides La 5 Ti 2 CuS 5 O 7 (LTC) and La 5 Ti 2 Cu 0.9 Ag 0.1 S 5 O 7 (LTCA) have emerged as promising photocathode materials, with the latter absorbing light up until 710 nm and demonstrating PEC H 2 production from aqueous solution, with an onset potential of 0.8 V versus the reversible hydrogen electrode (RHE) when using Pt as a co‐catalyst . Surface modification of LTC and LTCA photocathodes with thin TiO 2 layers improves their activity due to enhanced charge separation, and layers of amorphous TiO 2 have been shown to protect LTCA under strongly alkaline (pH 13) conditions …”

Section: Figurementioning

confidence: 99%

La₅Ti₂Cu_0.9Ag_0.1S₅O₇ Modified with a Molecular Ni Catalyst for Photoelectrochemical H₂ Generation

Rosser

Hisatomi

Sun

et al. 2018

Chemistry A European J

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The stable and efficient integration of molecular catalysts into p-type semiconductor materials is a contemporary challenge in photoelectrochemical fuel synthesis. Here, we report the combination of a phosphonated molecular Ni catalyst with a TiO -coated La Ti Cu Ag S O photocathode for visible light driven H production. This hybrid assembly provides a positive onset potential, large photocurrents, and high Faradaic yield for more than three hours. A decisive feature of the hybrid electrode is the TiO interlayer, which stabilizes the oxysulfide semiconductor and allows for robust attachment of the phosphonated molecular catalyst. This demonstration of an oxysulfide-molecular catalyst photocathode provides a novel platform for integrating molecular catalysts into photocathodes and the large photovoltage of the presented system makes it ideal for pairing with photoanodes.

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“…As imilar effect to that achieved with I-III-VI 2 compounds was obtained via surface modification with at hin (40-100 nm) CdS layer in conjunction with variousc halcogenide-based photocathode materials, includingC dTe, Cu 2 ZnSnS 4 and (ZnSe) 0.85 (CuIn 0.7 Ga 0.3 Se 2 ) 0.15 . [24][25][26][27][28][29][30][31] It should be noted that the Cd species diffusei nto the absorber during the chemical bath deposition of the CdS, resulting in the formation of Cd Cu antisites. [32] Because these defects act as donors, the regions con-tainingC d Cu antisites will exhibit n-type properties.…”

Section: Control Of Built-in Potentialmentioning

confidence: 99%

“…The authors also reported that the 0.98 eV offset between CuGaSe 2 and CdS can promote the selective diffusion of electrons into the CdS layer, as discussed in Section 3.2 below. A similar effect to that achieved with I‐III‐VI 2 compounds was obtained via surface modification with a thin (40–100 nm) CdS layer in conjunction with various chalcogenide‐based photocathode materials, including CdTe, Cu 2 ZnSnS 4 and (ZnSe) 0.85 (CuIn 0.7 Ga 0.3 Se 2 ) 0.15 . It should be noted that the Cd species diffuse into the absorber during the chemical bath deposition of the CdS, resulting in the formation of Cd Cu antisites .…”

Section: Roles Of Surface Modificationsmentioning

confidence: 99%

Recent Progress in the Surface Modification of Photoelectrodes toward Efficient and Stable Overall Water Splitting

Kaneko

Minegishi

Domen

2017

Chemistry A European J

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Photoelectrochemical (PEC) water splitting using a combination of a photocathode and photoanode is one of the most promising methods of producing hydrogen from water employing sunlight. Recent reports have shown that surface modification of the photoelectrodes dramatically improves their PEC performance. Bare photoelectrodes often exhibit insufficient depletion regions, undesired surface states and/or degradation due to photocorrosion. It has been demonstrated that surface modifications can tune the flat-band potentials, band-edge potentials, surface states and chemical stabilities of these electrodes and thus improve quantum efficiency, onset potential and durability. This review describes in detail the various surface modification materials that have been developed to date, and the functions of these modifiers. This information is expected to provide guidelines for the future development of photoelectrodes capable of highly efficient and stable PEC water splitting.

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Sunlight‐Driven Overall Water Splitting by the Combination of Surface‐Modified La₅Ti₂Cu_0.9Ag_0.1S₅O₇ and BaTaO₂N Photoelectrodes

Cited by 39 publications

References 24 publications

Transparent Ta₃N₅ Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

Transparent Ta₃N₅ Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

La₅Ti₂Cu_0.9Ag_0.1S₅O₇ Modified with a Molecular Ni Catalyst for Photoelectrochemical H₂ Generation

Recent Progress in the Surface Modification of Photoelectrodes toward Efficient and Stable Overall Water Splitting

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Sunlight‐Driven Overall Water Splitting by the Combination of Surface‐Modified La5Ti2Cu0.9Ag0.1S5O7 and BaTaO2N Photoelectrodes

Cited by 39 publications

References 24 publications

Transparent Ta3N5 Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

Transparent Ta3N5 Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

La5Ti2Cu0.9Ag0.1S5O7 Modified with a Molecular Ni Catalyst for Photoelectrochemical H2 Generation

Recent Progress in the Surface Modification of Photoelectrodes toward Efficient and Stable Overall Water Splitting

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Sunlight‐Driven Overall Water Splitting by the Combination of Surface‐Modified La₅Ti₂Cu_0.9Ag_0.1S₅O₇ and BaTaO₂N Photoelectrodes

Transparent Ta₃N₅ Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

Transparent Ta₃N₅ Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells

La₅Ti₂Cu_0.9Ag_0.1S₅O₇ Modified with a Molecular Ni Catalyst for Photoelectrochemical H₂ Generation