Probing fundamental losses in nanostructured Ta<sub>3</sub>N<sub>5</sub> photoanodes: design principles for efficient water oxidation

Nandal, Vikas; Pihosh, Yuriy; Higashi, Tomohiro; Minegishi, Tsutomu; Yamada, Taro; Seki, Kazuhiko; Sugiyama, Masakazu; Domen, Kazunari

doi:10.1039/d1ee01004b

Cited by 32 publications

(44 citation statements)

References 44 publications

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“…Such an approach has been applied to analyze various photocatalytic/photoelectrochemical systems such as particulate Al-dopes SrTiO 3 and Ta 3 N 5 thin-lm photoanode. 33,34 The methodology was detailed in the Simulation section S2 † and the employed parameters for a-Fe 2 O 3 were described in Table S1. † Firstly, the generation rate of the a-Fe 2 O 3 photoanode was calculated based on the AM 1.5G solar spectrum that reached to the electrode surface and the absorption coefficient, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Hematite photoanodes prepared by particle transfer for photoelectrochemical water splitting

Pan

Yanagi

Higashi

et al. 2022

Sustainable Energy Fuels

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Section: Resultsmentioning

confidence: 99%

Hematite photoanodes prepared by particle transfer for photoelectrochemical water splitting

Pan

Yanagi

Higashi

et al. 2022

Sustainable Energy Fuels

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“…In view of this, a detailed numerical model based Ba‐doped or undoped Ta 3 N 5 –NRs was devised, which can effectively predict various factors contributing to performance losses, such as optical effects, charge carrier recombination, and resistivity. [ 36 ]…”

Section: Core‐shell Tandem Nanostructured Photoelectrode For Pec Wate...mentioning

confidence: 99%

“…In view of this, a detailed numerical model based Ba-doped or undoped Ta 3 N 5 -NRs was devised, which can effectively predict various factors contributing to performance losses, such as optical effects, charge carrier recombination, and resistivity. [36] Recently, a family of spinel ferrites with a general formula of MFe 2 O 4 (M: Cu, Mg, Zn, etc.) had been explored as light absorber for PEC water splitting, owing to its narrow bandgap, Figure 4.…”

Section: The Core Of High Absorbent Materialsmentioning

confidence: 99%

Tandem Nanostructures: A Prospective Platform for Photoelectrochemical Water Splitting

Zhao

Wang

et al. 2022

Solar RRL

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A platform for efficient photoelectrochemical (PEC) water splitting must fulfil different requirements: the absorption of the solar spectrum should be maximized in use for charge carrier generation. To avoid recombination, fast separation of charge carriers is required and the energetic positions of the band structure(s) must be optimized with respect to the water splitting reactions. In these respects, constructing tandem nanostructures with rationally designed nanostructured units offers a potential opportunity to break the performance bottleneck imposed by the unitary nanostructure. So far, quite a few tandem nanostructures have been designed, fabricated, and employed to improve the efficiency of PEC water splitting, and significant achievements have been realized. This review focuses on the current advances in tandem nanostructures for PEC water splitting. Firstly, the state of the art for tandem nanostructures applied in PEC water splitting is summarized. Secondly, the advances in this field and advantages arising of employing tandem nanostructures for PEC water splitting are outlined. Subsequently, different types of tandem nanostructures are reviewed, including core‐shell tandem nanostructured photoelectrode, the two‐photoelectrode tandem cell, and the tandem nanostructures of plasmon related devices for PEC water splitting. Based on this, the future perspective of this field is proposed.

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“…Numerical simulation of particulate photocatalysts and photoelectrodes based on FEM is a strong technique to investigate the electronic structure in materials during water splitting conditions under illumination and to obtain a strategy for highly efficient solarto-hydrogen devices. [40][41][42][43] The impact of the band structure, donor density, and thickness of an n-type semiconductor is comprehensively demonstrated for the negative shift of the onset potential for OER for zero-bias overall water splitting. The main target of this work is zero-bias overall water splitting by n-type semiconductor modification, even if the n-type photon absorber is made defectively and has high donor density (>1 Â 10 18 cm À3 ), as in the case of Ta 3 N 5 .…”

Section: Introductionmentioning

confidence: 99%

Design Predictions of n–n Heterojunction Based Photoanode for Efficient Unbiased Overall Solar Water Splitting

et al. 2021

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There are multiple requirements for maximizing the efficiency of photoelectrochemical overall water splitting using a single n‐type semiconducting photoanode. Many visible‐light‐responsive photoanode materials have been developed but overall water splitting by such materials without external bias has hardly been demonstrated. Herein, the aim is to scale the impact of performance improvement by an n–n heterojunction photoanode comprising an n‐type thin modification surface layer over an n‐type photon absorber, using a finite element method. For the n‐type photon absorber, the semiconductor properties are initially set to those of a well‐studied visible–light‐absorbing Ta3N5, and key properties are varied. It is demonstrated that an appropriate donor density and thickness of the thin surface layer induce adequate energy band bending in the photon absorber, resulting in a dramatic reduction of the onset potential of the photoanode. Thus, even though the quality of the photoanode is poor (e.g., the donor density is high (≈1 × 1019 cm−3)), the optimized surface layer enables the n–n heterojunction photoanode to facilitate bias‐free solar water splitting. These exhaustive investigations could provide design guidelines for obtaining effective photoanodes using an n‐type surface modification layer, such as cocatalysts and hole collection layers.

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Probing fundamental losses in nanostructured Ta₃N₅ photoanodes: design principles for efficient water oxidation

Abstract: Detailed numerical simulations are performed to probe performance loss mechanisms and limiting parameters of Ta3N5-NRs based photoanodes. Device modelling enables the development of design strategies to realize efficient solar water oxidation.

Cited by 32 publications

References 44 publications

Hematite photoanodes prepared by particle transfer for photoelectrochemical water splitting

Hematite photoanodes prepared by particle transfer for photoelectrochemical water splitting

Tandem Nanostructures: A Prospective Platform for Photoelectrochemical Water Splitting

Design Predictions of n–n Heterojunction Based Photoanode for Efficient Unbiased Overall Solar Water Splitting

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Probing fundamental losses in nanostructured Ta3N5 photoanodes: design principles for efficient water oxidation

Abstract: Detailed numerical simulations are performed to probe performance loss mechanisms and limiting parameters of Ta3N5-NRs based photoanodes. Device modelling enables the development of design strategies to realize efficient solar water oxidation.

Cited by 32 publications

References 44 publications

Hematite photoanodes prepared by particle transfer for photoelectrochemical water splitting

Hematite photoanodes prepared by particle transfer for photoelectrochemical water splitting

Tandem Nanostructures: A Prospective Platform for Photoelectrochemical Water Splitting

Design Predictions of n–n Heterojunction Based Photoanode for Efficient Unbiased Overall Solar Water Splitting

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Probing fundamental losses in nanostructured Ta₃N₅ photoanodes: design principles for efficient water oxidation