Efficient photocatalytic activity of water oxidation over WO3/BiVO4 composite under visible light irradiation

Ponchio, Chatchai; Murakami, Yoshinori; Kishioka, Shin-ya; Nosaka, Atsuko Y.; Nosaka, Yoshio

doi:10.1016/j.electacta.2008.08.058

Cited by 297 publications

(149 citation statements)

References 26 publications

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“…In all cases, the photocurrent action spectra for the different electrodes are related to the absorption spectra, except for the contribution of the Au nanoparticles to the absorption spectra (absorption peak at around 580-590 nm). This indicates that the plasmonic excitation of the Au nanoparticles does not lead to PEC activity [37]. Thus, the improvement in the PEC performance can be explained by assuming that the Au nanoparticles exclusively act as cocatalyst, enhancing hole transfer from the BiVO4 to the electrolyte and diminishing recombination [54].…”

Section: Preparation Of Dopedmentioning

confidence: 99%

“…These include (i) controlling morphologies (film thickness, particle size/shape and porosity) [33][34][35], (ii) forming composite structures or heterojunctions [36,37] and especially (iii) doping (or alloying) [7,25,[38][39][40][41][42][43][44] and (iv) coupling with an oxygen evolution catalyst (OEC) [45][46][47][48][49][50][51][52][53][54][55]. In this way, doping strategies have been employed in an attempt to overcome the relatively slow electron transport in BiVO4.…”

Section: Introductionmentioning

confidence: 99%

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Improving the photoactivity of bismuth vanadate thin film photoanodes through doping and surface modification strategies

Quiñonero

Lana–Villarreal

Gómez

2016

Applied Catalysis B: Environmental

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2 Graphical abstract HIGHLIGHTS La and Ce doping greatly improves the photoresponse of BiVO4 photoanodes for PEC water oxidation.  Ce and La doping triggers a significantly shift of the flat band potential to more negative values.  Surface modification of the pristine and doped BiVO4 photoanodes with Au nanoparticles further enhances the photocurrent.  Gold nanoparticles act solely as co-catalytic centers without a contribution from visible sensitization. ABSTRACTCurrently, one of the most attractive and desirable ways to solve the energy challenge is harvesting energy directly from the sunlight through the so-called artificial photosynthesis. Among the ternary oxides based on earth-abundant metals, bismuth vanadate has recently emerged as a promising photoanode. Herein, BiVO4 thin film photoanodes have been successfully synthesized by a modified metal-organic precursor decomposition method, followed by an annealing treatment. In an attempt to improve the photocatalytic properties of this semiconductor material for photoelectrochemical water oxidation, the electrodes have been modified (i) by doping with La and Ce (by modifying the composition of the BiVO4 precursor solution with the desired concentration of the doping element), and (ii) by surface modification with Au nanoparticles potentiostatically electrodeposited. La and Ce doping at concentrations of 1 and 2 at% in the BiVO4 precursor solution, respectively, enhance significantly the photoelectrocatalytic performance of BiVO4 without introducing important changes in either the material structure or the electrode morphology, according to XRD and SEM characterization. In addition, surface modification of the electrodes with Au nanoparticles further enhances the photocurrent as such metallic nanoparticles act as co-catalysts, promoting charge transfer at the semiconductor/solution interface. The combination of these two complementary ways of modifying the electrodes has resulted in a significant increase in the photoresponse, facilitating their potential application in artificial photosynthesis devices.

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Section: Preparation Of Dopedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the photoactivity of bismuth vanadate thin film photoanodes through doping and surface modification strategies

Quiñonero

Lana–Villarreal

Gómez

2016

Applied Catalysis B: Environmental

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“…The transition of the tetragonal scheelite form into the monoclinic scheelite modification of BiVO 4 has been observed in the course of various preparative routes, such as solid state reactions [4], aqueous methods [5], hydrothermal treatment [6] or microwave-assisted processes [7]. Ultrasonic [8] and flame spray [9] synthetic pathways to BiVO 4 have furthermore been established.…”

Section: Introductionmentioning

confidence: 99%

Synthetic trends for BiVO4 photocatalysts: Molybdenum substitution vs. TiO2 and SnO2 heterojunctions

Kontic

Patzke

2012

Journal of Solid State Chemistry

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“…However, the broad band gap energy of this metal oxide limits its further use in solar light and visible light [4]. Therefore, many researches have been focused on narrowing the band gap energy of CeO2 photocatalyst [5]. This can be done either by doping CeO2 with metal/non-metal elements or forming the heterojunction between CeO2 and a narrow band gap semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of the Novel BiVO4/CeO2 Nanocomposites

Chaiwichian

Inceesungvorn

Pingmuang

et al. 2012

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Abstract. Novel BiVO4/CeO2 nanocomposites were synthesized by the hydrothermal method combined with the homogeneous precipitation method. The mole ratios of BiVO4:CeO2 were 0.4:0.6, 0.5:0.5, and 0.6:0.4. The obtained BiVO4/CeO2 nanocomposites were characterized by X-ray diffraction (XRD) for phase composition and crystallinity. Particle sizes, morphology and elemental composition of BiVO4/CeO2 nanocomposites were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The Brunauer, Emmett and Teller (BET) adsorption-desorption of nitrogen gas for specific surface area determination at the temperature of liquid nitrogen was performed on all samples. UV-vis diffuse reflectance spectra (UV-vis DRS) were used to identify the absorption range and band gap energy of the composite catalysts. The results indicated that BiVO4/CeO2 samples retained monoclinic scheelite and fluorite structures. The morphologies of nanocomposite samples consisted of rod-like, plate-like and spheroidal shapes. Specific surface area (SSABET) of the novel synthesized catalysts drastically increased from 38-62 m 2 /g whereas an average BET-equivalent particle diameter (dBET) significantly decreased from 30-12 nm, upon increasing the amount of CeO2 in the BiVO4/CeO2 composite. The absorption spectra of all nanocomposite samples were shifted to the visible region, suggesting the potential application of this novel composite as an active visible-light driven photocatalyst.

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Efficient photocatalytic activity of water oxidation over WO3/BiVO4 composite under visible light irradiation

Cited by 297 publications

References 26 publications

Improving the photoactivity of bismuth vanadate thin film photoanodes through doping and surface modification strategies

Improving the photoactivity of bismuth vanadate thin film photoanodes through doping and surface modification strategies

Synthetic trends for BiVO4 photocatalysts: Molybdenum substitution vs. TiO2 and SnO2 heterojunctions

Synthesis and Characterization of the Novel BiVO4/CeO2 Nanocomposites

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