Chemically induced porosity on BiVO<sub>4</sub> films produced by double magnetron sputtering to enhance the photo-electrochemical response

Thalluri, Sitaramanjaneya Mouli; Rojas, Roberto Mirabal; Depablos-Rivera, Osmary; Hernández, Simelys; Russo, Nunzio; Rodil, S.E.

doi:10.1039/c5cp01561h

Cited by 38 publications

(25 citation statements)

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“…However, the authors stated that defective states, induced by the synthesis procedure, may have caused the higher charge recombination in this particular porous photoanode. Indeed, the synthesis of porous BiVO 4 via another physical deposition technique, that is, double magnetron sputtering, yielded a photocurrent density of 1.2 mA/cm 2 at 1.23 V vs. RHE [61], which is 4-fold greater than the above mentioned bare BiVO 4 that was produced via spin-coating. Besides, similar or better results have recently been obtained by the electrodeposition technique, as described above.…”

Section: Strategiesmentioning

confidence: 99%

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

2017

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Photoelectrochemical (PEC) water splitting, which is a type of artificial photosynthesis, is a sustainable way of converting solar energy into chemical energy. The water oxidation half-reaction has always represented the bottleneck of this process because of the thermodynamic and kinetic challenges that are involved. Several materials have been explored and studied to address the issues pertaining to solar water oxidation. Significant advances have recently been made in the use of stable and relatively cheap metal oxides, i.e., semiconducting photocatalysts. The use of BiVO 4 for this purpose can be considered advantageous because this catalyst is able to absorb a substantial portion of the solar spectrum and has favourable conduction and valence band edge positions. However, BiVO 4 is also associated with poor electron mobility and slow water oxidation kinetics and these are the problems that are currently being investigated in the ongoing research in this field. This review focuses on the most recent advances in the best-performing BiVO 4 -based photoanodes to date. It summarizes the critical parameters that contribute to the performance of these photoanodes, and highlights so far unresolved critical features related to the scale-up of a BiVO 4 -based PEC water-splitting device.

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Section: Strategiesmentioning

confidence: 99%

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

2017

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“…AgNO3) [11,19]. Nonetheless, the role of porosity and nanostructuration on s-m BiVO4based thin films has rarely been investigated in PECs [28].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the charge transfer kinetics of spin-coated BiVO 4 thin films for sun-driven water photoelectrolysis

Hernández

Gerardi

Bejtka

et al. 2016

Applied Catalysis B: Environmental

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The present research work focuses on bismuth vanadate (BiVO4) thin films deposited on FTO-coated glass electrodes through the spin-coating technique, and discusses the influence of different film morphologies (dense and porous) on the physicochemical properties and photoelectrochemical (PEC) performance of the as-prepared photoanodes, for the water splitting reaction. The surface recombination phenomenon, which is one of the main issues of BiVO4, has been quantified by means of two distinct approaches: transient photocurrent measurements and electrochemical impedance spectroscopy (EIS). This phenomenon has resulted to be higher in the porous material, thus a poorer performance has been observed than in the dense material. In order to increase the BiVO4 efficiency, a cobalt phosphate (CoPi) catalyst has been photo-electrodeposited onto the best BiVO4 electrode, employing an optimized technique and a photocurrent of up to 3 mA/cm 2 at 1.23 V vs. RHE under neutral pH and 1 sun irradiation (100 mW/cm 2) has been achieved. The charge transfer kinetics of the BiVO4 photoanodes, with and without CoPi, has also been quantified. The beneficial effect of this water oxidation catalyst, as well as the influence of the preparation method on the uniformity of the film and on its actual performance, is discussed in view of its prospective application in a real PEC device.

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“…327.8 cm À1 and 362.6 cm À1 , respectively. 16 The peak of BiVO 4 -OV become weaker and wider than BiVO 4 -P, owing to the crystallinity weakening and the lattice distortion, which can manifest some oxygen atoms have been removed from BiVO 4 , resulting in the formation of oxygen vacancy defects. 17 This similar phenomenon also appears in the Raman peaks spectrograms that were employed by laser lines 532 and 785 nm (Fig.…”

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Interfacial defect engineering over fusiform bismuth vanadate photocatalyst enables to excellent solar-to-chemical energy coupling

et al. 2017

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The presence of surface oxygen vacancies over oxide semiconductors plays a versatile role in the development of light-driven organic degradation and energy production. Simultaneously, the role of defect sites successfully forms an ideal model for the photocatalytic responsiveness over BiVO 4 -OV in the NIR region.With the development of industrialization and rapid growth of the population, the global energy crisis and the serious problems accompanying combustion of fossil fuels threaten our environment, climate and human health.1 Therefore, we suggest that a simple and efficient strategy can effectively solve aforementioned problems, that is quite important but challenging.2 The sustainable and environmentally friendly lightdriven technologies have obtained considerable interdisciplinary attention in recent years. At present, metal oxide semiconductors as efficient catalysts for H 2 production from water splitting and using solar light energy for the degradation of environmental pollutants have been investigated for various potential applications because of their high thermal conductivity, high chemical stability and low environmental toxicity. As previous report, the photocatalysts such as MoS 2 , ZnSnO 3 , g-C 3 N 4 and 3C-SiC, 3 were demonstrated profound improvement of its photocatalytic activity. They hold a great promise to realize the fast pollutant degradation and efficient energy generation via utilizing solar energy. However, sunlight basically consists of 44% visible light, 3% ultraviolet and the remainder infrared light.4 Unfortunately, the most of conventional photocatalysts only can utilize UV or/and visible light to achieve the solar-tochemical energy conversion.5 To overcome the grant challenge, we tried best to effectively broaden the optical window of conventional photocatalysts and endow them with considerable utilization efficiency of near infrared light. This kind of photocatalysts could realize the remarkable enhancement of photocatalytic activity. Besides, the main limitation of energy conversion originates from two bottlenecks. They are poor transition probability of photoexcited electrons to the conduction band under solar light illumination and serious photogenerated electron-hole recombination. In order to solve the problems, it is very important for the researchers to seek a desirable material that could improve fundamentally properties of the sunlight harvesting and the carrier separation/ transmission.To date, only a few photocatalytic materials were reported that can efficiently utilize NIR light to achieve the pollutant decomposition and the clean energy production. In the regard, upconversion material doped photocatalyst, narrow band gap photocatalyst and plasmon-assisted photocatalyst, have been successfully presented to improve the photocatalytic activity. 6However, some photocatalytic materials still suffer from intrinsic drawbacks. For instance, the applications of narrowband gap photocatalysts are severely restricted owing to their inappropriate energy band positions lead to...

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Chemically induced porosity on BiVO₄ films produced by double magnetron sputtering to enhance the photo-electrochemical response

Cited by 38 publications

References 42 publications

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

Evaluation of the charge transfer kinetics of spin-coated BiVO 4 thin films for sun-driven water photoelectrolysis

Interfacial defect engineering over fusiform bismuth vanadate photocatalyst enables to excellent solar-to-chemical energy coupling

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Chemically induced porosity on BiVO4 films produced by double magnetron sputtering to enhance the photo-electrochemical response

Cited by 38 publications

References 42 publications

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges

Evaluation of the charge transfer kinetics of spin-coated BiVO 4 thin films for sun-driven water photoelectrolysis

Interfacial defect engineering over fusiform bismuth vanadate photocatalyst enables to excellent solar-to-chemical energy coupling

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Chemically induced porosity on BiVO₄ films produced by double magnetron sputtering to enhance the photo-electrochemical response