Photoanodes on titanium substrates: one-step deposited BiVO4 versus two-step nano-V2O5 films impregnated with Bi3+

Gromboni, Murilo F.; Araújo, Moisés A. de; Downey, Elizabeth; Marken, Frank; Mascaro, Lúcia H.

doi:10.1007/s10008-015-3034-1

Cited by 4 publications

(3 citation statements)

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“…We have recently reported a simple "one-step" approach for the formation of BiVO4 from a paint precursor applied to tin-doped indium oxide (ITO) substrates [35] and for application of BiVO4 coatings onto titanium substrates [36]. The resulting monoclinic BiVO4 has a bright yellow colour and therefore offers an effective absorption band in the visible range of the optical spectrum (with a band gap of typically 2.5 eV).…”

Section: Introductionmentioning

confidence: 99%

Enhancing activity in a nanostructured BiVO4 photoanode with a coating of microporous Al2O3

Gromboni

Coelho

Mascaro

et al. 2017

Applied Catalysis B: Environmental

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Fx1 Highlights: • Thin alumina barrier coating can enhance photo-activity of bismuth vanadate photoanode materials • There are two distinct potential domains with different enhancement characteristics and mechanisms • The thickness of alumina films can be controlled with a sol-gel coating to provide optimized performance Abstract Nanostructured semiconductor photoanodes play an important role in solar fuel generation, and the design of the semiconductor -aqueous electrolyte interface can be crucial in enhancing the energy conversion efficiency. We have investigated the effects on photoelectrochemical oxygen evolution for monoclinic nanostructured BiVO4 films uncoated and coated with microporous sol-gel Al2O3 "over-layers". Variation of the thickness of the Al2O3 coating (formed by surface sol-gel deposition and annealing at 435 o C) led to a reduction of pseudo-capacitance and allowed optimization of the quantum efficiency. Exploration of the photocurrent enhancement as a function of applied potential reveals two distinct potential domains/mechanisms: (i) a low bias region enhancement effect (assigned to a lowering of the rate of external recombination of electrons with oxygen) and (ii) a high bias region of enhancement (assigned to higher charge carrier mobility due to less trapping in surface states).

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Section: Introductionmentioning

confidence: 99%

Enhancing activity in a nanostructured BiVO4 photoanode with a coating of microporous Al2O3

Gromboni

Coelho

Mascaro

et al. 2017

Applied Catalysis B: Environmental

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“…5(b), the photostability test of DI + EG showed B33.6% loss of photoanodic behavior over a period of 2500 s. The two sets of films are, therefore, separated by both their characteristics and photoelectrochemical performance. Since V 2 O 5 usually shows low photoelectrochemical performance and the presence of a negligible amount of V 2 O 5 could not form the potential BiVO 4 /V 2 O 5 heterojunction system to enhance charge separation, [55][56][57][58] high photocurrent in EtOH + HNO 3 and DI + EG is most likely caused by their morphologies and exposed facets. Here, the plate-like particles generally result in better PEC properties compared with the cuboid-like particles.…”

Section: Photoelectrochemical (Pec) Propertiesmentioning

confidence: 99%

Controllable synthesis of nanostructured bismuth vanadate thin films as an efficient catalyst for photoelectrochemical water splitting

et al. 2023

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“…Another rarely studied semiconductor for photoelectrochemical water splitting is the vanadium oxide (V 2 O 5 ) due to its low photoelectrochemical performance . Despite this, V 2 O 5 has a band gap energy ( E g = 2.3 eV) smaller than that of BiVO 4 , which enable it to absorb visible light more efficiently.…”

Section: Introductionmentioning

confidence: 99%

High Water Oxidation Performance of W‐Doped BiVO₄ Photoanodes Coupled to V₂O₅ Rods as a Photoabsorber and Hole Carrier

et al. 2018

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Monoclinic BiVO 4 is recognized as a promising photoanode for water oxidation, but its relatively wide bandgap energy (E g %2.5 eV) and poor charge transport limit the light absorption (η abs ) and charge separation (η sep ) efficiencies, thus resulting in low photocurrents. To solve these drawbacks, here the η abs Â η sep product has been decoupled by combining W-doped BiVO 4 and V 2 O 5 rods (E g %2.1 eV) for simultaneously increasing the light harvesting and the charge separation in photoanodes under back-side illumination. In this strategy, V 2 O 5 rods maximize the light absorption and hole transport throughout the W-BiVO 4 film, making more holes to achieve the V 2 O 5 /W-BiVO 4 /H 2 O interface to trigger the water oxidation reaction with photocurrents as high as 6.6 mA cm À2 at 1.23 V RHE after 2 h reaction. Notably, under back-side illumination, the W-BiVO 4 /V 2 O 5 photoanode exhibited η abs Â η sep of 74.5 and 93.0% at 0.5 and 1.23 V RHE , respectively, the highest values reported up to date for BiVO 4 -based photoelectrodes. This simple strategy brings us closer to develop efficient photoanodes for photoelectrochemical water splitting devices.

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Photoanodes on titanium substrates: one-step deposited BiVO4 versus two-step nano-V2O5 films impregnated with Bi3+

Cited by 4 publications

References 49 publications

Enhancing activity in a nanostructured BiVO4 photoanode with a coating of microporous Al2O3

Enhancing activity in a nanostructured BiVO4 photoanode with a coating of microporous Al2O3

Controllable synthesis of nanostructured bismuth vanadate thin films as an efficient catalyst for photoelectrochemical water splitting

High Water Oxidation Performance of W‐Doped BiVO₄ Photoanodes Coupled to V₂O₅ Rods as a Photoabsorber and Hole Carrier

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Photoanodes on titanium substrates: one-step deposited BiVO4 versus two-step nano-V2O5 films impregnated with Bi3+

Cited by 4 publications

References 49 publications

Enhancing activity in a nanostructured BiVO4 photoanode with a coating of microporous Al2O3

Enhancing activity in a nanostructured BiVO4 photoanode with a coating of microporous Al2O3

Controllable synthesis of nanostructured bismuth vanadate thin films as an efficient catalyst for photoelectrochemical water splitting

High Water Oxidation Performance of W‐Doped BiVO4 Photoanodes Coupled to V2O5 Rods as a Photoabsorber and Hole Carrier

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High Water Oxidation Performance of W‐Doped BiVO₄ Photoanodes Coupled to V₂O₅ Rods as a Photoabsorber and Hole Carrier