Highly crystalline Na0.5Bi0.5TiO3 of a photocatalyst valence-band-controlled with Bi(<scp>iii</scp>) for solar water splitting

Watanabe, Kenta; Iikubo, Yoichi; Yamaguchi, Yuichi; Kudo, Akihiko

doi:10.1039/d0cc07371g

Cited by 10 publications

(7 citation statements)

References 36 publications

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“…Because of having exceptional piezoelectricity and pyroelectricity, relaxor FE Na 0.5 Bi 0.5 TiO 3 (NBT, E g = 3.1 eV) [ 130 ] serves as an important lead‐free system, which also exhibits decent photovoltaic effect and photocatalytic activity in water splitting. [ 131,132 ] As for its ground‐state structure, the decades‐long issue [ 133 ] reaches a general consensus until affirmation of a monoclinic (Cc) phase, [ 134,135 ] which arises from Na/Bi positional disorder. By suppressing this disorder via poling, the average Cc phase irreversibly transforms into the R3c phase.…”

Section: Electrostatic Energy Storage Systemsmentioning

confidence: 99%

Progress on Emerging Ferroelectric Materials for Energy Harvesting, Storage and Conversion

Wei

Domingo

Sun

et al. 2022

Advanced Energy Materials

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Since the discovery of Rochelle salt a century ago, ferroelectric materials have been investigated extensively due to their robust responses to electric, mechanical, thermal, magnetic, and optical fields. These features give rise to a series of ferroelectric‐based modern device applications such as piezoelectric transducers, memories, infrared detectors, nonlinear optical devices, etc. On the way to broaden the material systems, for example, from three to two dimensions, new phenomena of topological polarity, improper ferroelectricity, magnetoelectric effects, and domain wall nanoelectronics bear the hope for next‐generation electronic devices. In the meantime, ferroelectric research has been aggressively extended to more diverse applications such as solar cells, water splitting, and CO2 reduction. In this review, the most recent research progress on newly emerging ferroelectric states and phenomena in insulators, ionic conductors, and metals are summarized, which have been used for energy storage, energy harvesting, and electrochemical energy conversion. Along with the intricate coupling between polarization, coordination, defect, and spin state, the exploration of transient ferroelectric behavior, ionic migration, polarization switching dynamics, and topological ferroelectricity, sets up the physical foundation ferroelectric energy research. Accordingly, the progress in understanding of ferroelectric physics is expected to provide insightful guidance on the design of advanced energy materials.

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Section: Electrostatic Energy Storage Systemsmentioning

confidence: 99%

Progress on Emerging Ferroelectric Materials for Energy Harvesting, Storage and Conversion

Wei

Domingo

Sun

et al. 2022

Advanced Energy Materials

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“…The band gap of Bi-TLO (3.30 eV) was smaller than that of CsTLO (3.60 eV), indicating the band gap narrowing effect when Bi 3+ was incorporated. Substitution of La 3+ in Na 0.5 La 0.5 TiO 3 by Bi 3+ resulted in the band gap narrowing of 0.3 eV due to the hybridized orbitals between O 2p and Bi 6s at the valence band . The energy band diagram of Bi-TLO is drawn in Figure S2 (the detailed calculation is shown in the Supporting Information), where the VB shifted upward with respect to that of CsTLO.…”

Section: Resultsmentioning

confidence: 99%

Efficient p–n Heterojunction Photocatalyst Composed of Bismuth Oxyiodide and Layered Titanate

2022

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Bismuth oxyhalides and layered alkali titanates are promising components to design high-performance hybrid photocatalysts. In this work, a hybrid photocatalyst composed of lepidocrocite-type layered cesium titanate (Cs0.7Ti1.77Li0.23O4, CsTLO) and bismuth oxyiodide (BiOI) was designed rationally based on lattice matching. BiOI formed on the layered titanate by ion exchange of CsTLO with Bi cations and subsequent growth of BiOI nanodisks (6 nm in the thickness and 125 nm in the lateral size) in an aqueous solution of cesium iodide, resulting in the hybrid where BiOI nanodisks were lying flat on the layered titanate and exposed the (001) facet predominantly. The present hybrid exhibited efficient photodegradation of methylene blue (4, 10, and 14 times higher than that of CsTLO, Bi-TLO, and BiOI, respectively), which was ascribed to the efficient charge transfer in the bulk and at the interface assisted by the built-in internal electric fields and the high activity of (001) BiOI for direct oxidation of the pollutant.

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“…However, pure NBT exhibits a wide band gap of (∼3.10 eV) which hinders visible-light-driven photocatalysis. To overcome this issue, recently, NBT-based ternary composite RhCr 2 O x /Na 0.5 Bi 0.5 TiO 3 /CoOOH has been reported by Watanabe et al which showed overall photocatalytic water splitting with significant high rates of H 2 (102 μmol h –1 ) and O 2 generation (50 μmol h –1 ) due to the suitable alignment of conduction band (CB) and valence band (VB) edge. In another example, Chauhan et al reported a 20 times greater rate of Rhodamine B dye degradation with Na 0.5 Bi 0.5 TiO 3 –BiOCl composites as compared to bare NBT due to the formation of a type-II heterojunction at the interface which promotes facile charge transfer.…”

Section: Introductionmentioning

confidence: 99%

Construction of a 3D/2D Z-Scheme Heterojunction for Promoting Charge Separation and Augmented Photocatalytic Hydrogen Evolution

Samajdar,

Ghosh,

Thandavarayan

et al. 2023

Energy Fuels

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Fabrication of multidimensional heterogeneous photocatalysts combining two-dimensional (2D) and three-dimensional (3D) nanostructures is crucial for efficient solar energy conversion at the 3D/2D interface. Herein, a direct Z-scheme heterostructure has been developed by modification of the wide band gap Na0.5Bi0.5TiO3 (NBT, 3.10 eV) with graphene nanosheets via a facile hydrothermal method which demonstrated a 14-fold increase in H2 generation (∼100 mmol h–1 g–1) with an apparent quantum yield of 6.3% compared to pure NBT (∼7 mmol h–1 g–1) under visible light. The photoelectrochemical measurements reveal that the NBT/reduced graphene oxide exhibits ∼32 times enhancement in photocurrent density due to a significant increase in the charge-carrier concentration (1.8 × 1017 cm–3) of the heterostructure as compared to bare NBT (3.4 × 1016 cm–3). Remarkably, the formation of a direct Z-scheme heterojunction at the interface of graphene and NBT induces an in-built electric field and facilitates the vectorial transfer of the photogenerated charge carriers, which improves the rate of H2 generation without using noble metal-based cocatalysts. Moreover, waste-derived NBT/reduced graphene oxide from the graphite powder reclaimed from spent Li-ion batteries shows excellent photocatalysis performance comparable to natural resources. This suggests the potential for large-scale photocatalysts production from waste-derived carbon source for solar fuel generation.

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Highly crystalline Na_0.5Bi_0.5TiO₃ of a photocatalyst valence-band-controlled with Bi(iii) for solar water splitting

Abstract: Highly crystalline Na0.5Bi0.5TiO3 as a photocatalyst valence-band-controlled with Bi(iii) split water under simulated sunlight irradiation.

Cited by 10 publications

References 36 publications

Progress on Emerging Ferroelectric Materials for Energy Harvesting, Storage and Conversion

Progress on Emerging Ferroelectric Materials for Energy Harvesting, Storage and Conversion

Efficient p–n Heterojunction Photocatalyst Composed of Bismuth Oxyiodide and Layered Titanate

Construction of a 3D/2D Z-Scheme Heterojunction for Promoting Charge Separation and Augmented Photocatalytic Hydrogen Evolution

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Highly crystalline Na0.5Bi0.5TiO3 of a photocatalyst valence-band-controlled with Bi(iii) for solar water splitting

Abstract: Highly crystalline Na0.5Bi0.5TiO3 as a photocatalyst valence-band-controlled with Bi(iii) split water under simulated sunlight irradiation.

Cited by 10 publications

References 36 publications

Progress on Emerging Ferroelectric Materials for Energy Harvesting, Storage and Conversion

Progress on Emerging Ferroelectric Materials for Energy Harvesting, Storage and Conversion

Efficient p–n Heterojunction Photocatalyst Composed of Bismuth Oxyiodide and Layered Titanate

Construction of a 3D/2D Z-Scheme Heterojunction for Promoting Charge Separation and Augmented Photocatalytic Hydrogen Evolution

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Highly crystalline Na_0.5Bi_0.5TiO₃ of a photocatalyst valence-band-controlled with Bi(iii) for solar water splitting