Electric investigation of a photo-electrochemical water splitting device based on a proton exchange membrane within drilled FTO-covered quartz electrodes: under dark and light conditions

Hernández, Simelys; Saracco, Guido; Alexe-Ionescu, A.L.; Barbero, Giulia

doi:10.1016/j.electacta.2014.08.057

Cited by 12 publications

(11 citation statements)

References 33 publications

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“…Photoelectrochemical (PEC) and electrochemical tests were performed in a home-designed lab device similar to the one reported in our previous works, , which was appositely designed to hold a low electrolyte volume and to have a reduced distance between electrodes of about 6 mm (see Figure ). The experiments were made at ambient temperature with a two-electrode configuration, using the BiVO 4 /FTO electrode as working electrode and the Pt/FTO as both counter and reference electrodes, in a sodium phosphate buffer solution (0.1 M, pH = 7).…”

Section: Methodsmentioning

confidence: 99%

Considerations on Oxygen Bubble Formation and Evolution on BiVO₄ Porous Anodes Used in Water Splitting Photoelectrochemical Cells

et al. 2015

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The important problem of the bubble formation and evolution on a bismuth vanadate anode, and their consequence on the efficiency of a photoelectrochemical cell is analyzed. Although bubbles represent the way in which the gas products are collected to be stored, they first tend to stick on the electrode surface, decreasing the effective area, increasing the interfacial electric resistance, and, thus, increasing the losses. Starting with general thermodynamic considerations on the process of bubble generation, two ideal surfaces have been imagined: the inner surfaceinside the poreswhere the main electrochemical processes take place, and the outer surface, on which the bubbles stick until they are large enough to leave the surface and be collected. A percolation approach has been used in order to explain the time variation (decrease) of the photoelectric process during the bubble generation. On the basis of the percolation approach, a fitting function has been proposed in order to analyze the experimental data recorded for a bismuth vanadate porous photoanode tested into a home-designed photoelectrochemical cell at several bias voltages, under dark and light conditions.

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Section: Methodsmentioning

confidence: 99%

Considerations on Oxygen Bubble Formation and Evolution on BiVO₄ Porous Anodes Used in Water Splitting Photoelectrochemical Cells

et al. 2015

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“…Nevertheless, under highly oxidizing conditions, or in the presence of concentrated (acid or basic) electrolytes, they can suffer from low corrosion stability; moreover, they can have a lower surface area than the nanostructured substrates. In order to overcome some of such issues, a new design of FTO-covered quartz laser drilled electrodes was recently proposed by Hernández et al [93,94]. As shown in Figure 7, this substrate combines several advantages: good transparency (~62% of transmittance), high diffuse reflectance (~37%), low electric resistance, (≤40 Ω/square), and easy adhesion of the photo-catalysts; in addition, this substrate allows In order for these materials to be used in a Polymeric Exchange Membrane (PEM)-type photo-electrolysis device, to make a membrane-electrode assembly (MEA), the presence of macroporosity is indispensable to allow the diffusion of the water, protons (H + ) and produced gases.…”

Section: Substrate Modificationmentioning

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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“…At this state, the concentration of product on the inner and outer sides of the pores in the photocatalysts, coverage of surface bubbles, concentration of bubbles in the electrolyte, and the flow rate of electrolyte through the system will not change. 94 From the thermodynamic perspective, the pressure inside the gas bubbles (P b ) can be described as…”

Section: Desorption Of Productsmentioning

confidence: 99%

Current Mechanistic Understanding of Surface Reactions over Water-Splitting Photocatalysts

Zhang

Wang

Gong

2018

Chem

104

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Solar water splitting for hydrogen generation over semiconductor photoelectrodes is a promising solution to the energy crisis and environmental issues. Because complex physical, chemical, and electrical processes are involved in solar energy conversion reactions, understanding the mechanisms is of great significance for the rational design of highly efficient solar water-splitting cells. This review describes the current mechanistic understanding of the adsorption of reactants, injection of charge carriers, and desorption of products during surface redox reactions. Variations of interfacial band-gap structures, the status of surface bonding, and the behavior of charge carriers in semiconductor photoelectrodes are discussed. This review could inspire further innovative work on understanding the mechanisms of solar water splitting.

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Electric investigation of a photo-electrochemical water splitting device based on a proton exchange membrane within drilled FTO-covered quartz electrodes: under dark and light conditions

Cited by 12 publications

References 33 publications

Considerations on Oxygen Bubble Formation and Evolution on BiVO₄ Porous Anodes Used in Water Splitting Photoelectrochemical Cells

Considerations on Oxygen Bubble Formation and Evolution on BiVO₄ Porous Anodes Used in Water Splitting Photoelectrochemical Cells

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

Current Mechanistic Understanding of Surface Reactions over Water-Splitting Photocatalysts

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Electric investigation of a photo-electrochemical water splitting device based on a proton exchange membrane within drilled FTO-covered quartz electrodes: under dark and light conditions

Cited by 12 publications

References 33 publications

Considerations on Oxygen Bubble Formation and Evolution on BiVO4 Porous Anodes Used in Water Splitting Photoelectrochemical Cells

Considerations on Oxygen Bubble Formation and Evolution on BiVO4 Porous Anodes Used in Water Splitting Photoelectrochemical Cells

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

Current Mechanistic Understanding of Surface Reactions over Water-Splitting Photocatalysts

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Considerations on Oxygen Bubble Formation and Evolution on BiVO₄ Porous Anodes Used in Water Splitting Photoelectrochemical Cells

Considerations on Oxygen Bubble Formation and Evolution on BiVO₄ Porous Anodes Used in Water Splitting Photoelectrochemical Cells