A perovskite solar cell-TiO<sub>2</sub>@BiVO<sub>4</sub> photoelectrochemical system for direct solar water splitting

Zhang, Xiaofan; Zhang, Bingyan; Cao, Kun; Brillet, Jérémie; Chen, Jianyou; Wang, Mingkui; Shen, Yan

doi:10.1039/c5ta05838d

Cited by 113 publications

(41 citation statements)

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“…There is urgent needs for photoanodes with sufficient light absorption, fast charge separation, and transfer process to achieve high solar to hydrogen (STH) efficiency . To date, a wide range of semiconductors including TiO 2 , Fe 2 O 3 , BiVO 4 , ZnO, and WO 3 have been studied for PEC water oxidation. Among them, WO 3 as one of the most promising semiconductors has attracted tremendous attention due to its narrow indirect band gap ( E g = 2.5–2.8 eV).…”

Section: Introductionmentioning

confidence: 99%

N Doped Carbon Dot Modified WO₃ Nanoflakes for Efficient Photoelectrochemical Water Oxidation

Kong

Zhang

Liu

et al. 2018

Adv Materials Inter

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It is a serious challenge to develop photoanodes with fast charge separation efficiency and surface reaction kinetics. Herein, the N doped carbon dot modified WO3 nanoflake (NCDs/WO3) is constructed by impregnation method. The resulting NCDs/WO3 exhibits an excellent photocurrent density of 1.42 mA cm−2 (1.0 V vs saturated calomel electrode, SCE) in 1 m H2SO4 solution under AM 1.5 G irradiation, which is 2.25 times higher than that of the pristine WO3. In addition, the onset potential of NCDs/WO3 photoanode represents a cathodic shift of 70 mV, indicating the charge separation and transfer process are both promoted. These results demonstrate N doped CD modified WO3 can further enhance the conductivity and electrochemical activity surface area, which contributes to the higher photoelectrochemical (PEC) performance. This work provides an efficient strategy for the development of doping carbon material with heteroatoms to increase the charge transfer and charge separation efficiency in PEC water oxidation.

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Section: Introductionmentioning

confidence: 99%

N Doped Carbon Dot Modified WO₃ Nanoflakes for Efficient Photoelectrochemical Water Oxidation

Kong

Zhang

Liu

et al. 2018

Adv Materials Inter

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“…Moreover, charge‐transfer efficiency appears to be nearly 100 %, as there are no observable spikes in the photocurrent curve, which indicate that hole current and steady‐state currents are the same and, therefore, surface recombination is minimal (i.e., all charges are transferred directly into chemical products and the energy barrier for chemical formation is minimal) . Other photocurrent bottlenecks most likely remain unaffected, such as aqueous diffusion of reactants and products at the solution interface and intrinsic photocharge‐generation limitations . Under sulfite hole‐scavenger conditions, dark reactions increase by a factor of 2.5 at 1.6 V versus RHE, which indicates that sulfite is a functional hole scavenger for this material study, as it is readily decomposed at minimal applied potentials even in the absence of light.…”

Section: Resultsmentioning

confidence: 99%

Systematic Material Study Reveals TiNb₂O₇ as a Model Wide‐Bandgap Photoanode Material for Solar Water Splitting

Burns

Pergolesi

Schmidt

et al. 2020

Chemistry A European J

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This work reveals that photoanodes based on TiNb 2 O 7 (TNO)p owder show remarkablew ater-oxidation properties including nearly ideal charge-transfer and chargeinjectione fficiencies. Furthermore, using as implified photoanode construction and carefully surveying the structural and morphological characteristics of oriented and polycrystalline thin films and powder-based samples revealedt hat the water-splitting kinetics of TNO is negligibly effected by surface morphology; instead, internal grain boundaries likely play ad riving role. The current powder-based TNO photoanodes exhibit ideal water-oxidation kinetics and oxidize water at minimal applied biases under illumination; consequently, TNO exhibits an early onset photocurrent voltage (0.4 Vv s. RHE) that rivals that of other state-of-the-art photoanode materials. Figure 10. Linear voltage sweep comparison of a) TNO-powder-based photoanodes and 400 nm polycrystalline TNO film and b) thick (400 nm) and thin (100 nm) TNO film photoanodes (the 100 nm TNO photoanode is shownwith chopped-lightillumination for easy dark-current comparison).

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“…However, doping with In 3+ and Mo 6+ ions results in greenish BiVO 4 , which is an efficient overall water splitting photocatalyst . However, making heterojunctions of BiVO 4 with other semiconductors including TiO 2 , ZnO, Sb‐doped SnO 2 , and Co 3 O 4 , improves the photogenerated charge separation in BiVO 4 . Type‐II band alignment of BiVO 4 with other semiconductors (mainly p–n heterojunctions) results in the separation of charge carriers leading to the superior photo‐electrochemical activity of the heterojunctions.…”

Section: Semiconductor–semiconductor Interfacementioning

confidence: 99%

Interfacial Charge Transfer in Photoelectrochemical Processes

Kumar

Ojha

Ganguli

2017

Adv Materials Inter

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Solar light harvesting and conversion to useful energy are the most important tasks for overcoming the world energy crisis. The design of advanced materials for solar light conversion requires focused research to obtain efficient photocatalytic systems. Photogenerated charge carrier separation is a crucial prerequisite in applications such as photo‐electrochemical water splitting, photovoltaics, and photocatalytic dye degradation. Interfacial charge‐transfer (IFCT) plays a significant role in electron–hole separation considering the energy barriers of the energy levels at semiconductor–semiconductor, semiconductor–metal, semiconductor–molecule, and semiconductor–electrolyte interfaces. Both electron and hole transport across the interface via IFCT, with comparable rates, are important for maintaining enhanced photocatalytic efficiency and stability of the catalysts. The key focus of this article is to understand the charge transfer processes at the interface and the relationship between photogenerated charge separation and photocatalytic activity. The interfacial charge transfer in different interfaces is discussed, along with the fundamentals of IFCT in photo‐electrochemical processes; semiconductor heterojunctions with materials having proper band alignment and offer new ways to design multifunctional photocatalysts are also disucssed. The charge transfer process from semiconductor to catalyst molecules and dye molecules to semiconductor is explained in detail.

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A perovskite solar cell-TiO₂@BiVO₄ photoelectrochemical system for direct solar water splitting

Abstract: A novel perovskite solar cell-TiO2@BiVO4 photoelectrochemical system for direct solar water splitting shows an overall solar-to-hydrogen efficiency of 1.24%.

Cited by 113 publications

References 50 publications

N Doped Carbon Dot Modified WO₃ Nanoflakes for Efficient Photoelectrochemical Water Oxidation

N Doped Carbon Dot Modified WO₃ Nanoflakes for Efficient Photoelectrochemical Water Oxidation

Systematic Material Study Reveals TiNb₂O₇ as a Model Wide‐Bandgap Photoanode Material for Solar Water Splitting

Interfacial Charge Transfer in Photoelectrochemical Processes

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A perovskite solar cell-TiO2@BiVO4 photoelectrochemical system for direct solar water splitting

Abstract: A novel perovskite solar cell-TiO2@BiVO4 photoelectrochemical system for direct solar water splitting shows an overall solar-to-hydrogen efficiency of 1.24%.

Cited by 113 publications

References 50 publications

N Doped Carbon Dot Modified WO3 Nanoflakes for Efficient Photoelectrochemical Water Oxidation

N Doped Carbon Dot Modified WO3 Nanoflakes for Efficient Photoelectrochemical Water Oxidation

Systematic Material Study Reveals TiNb2O7 as a Model Wide‐Bandgap Photoanode Material for Solar Water Splitting

Interfacial Charge Transfer in Photoelectrochemical Processes

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A perovskite solar cell-TiO₂@BiVO₄ photoelectrochemical system for direct solar water splitting

N Doped Carbon Dot Modified WO₃ Nanoflakes for Efficient Photoelectrochemical Water Oxidation

N Doped Carbon Dot Modified WO₃ Nanoflakes for Efficient Photoelectrochemical Water Oxidation

Systematic Material Study Reveals TiNb₂O₇ as a Model Wide‐Bandgap Photoanode Material for Solar Water Splitting