pH-Dependent photocatalytic performance of modified bismuth vanadate by bismuth ferrite

2019 ◽  
Vol 43 (23) ◽  
pp. 9106-9115 ◽  
Author(s):  
Meysam Tayebi ◽  
Ahmad Tayyebi ◽  
Tayyebeh Soltani ◽  
Byeong-Kyu Lee
Keyword(s):  
Thin Layer ◽  
Photocatalytic Performance ◽  
Bismuth Ferrite ◽  
Bismuth Vanadate ◽  
Photoelectrochemical Performance ◽  
Ph Dependent

The photoelectrochemical performance of bismuth vanadate (BVO) improved by a thin layer of bismuth ferrite (BFO).

Facile and sustainable synthesis of carbon-doped ZnO nanostructures towards the superior visible light photocatalytic performance

2017 ◽  
Vol 41 (17) ◽  
pp. 9314-9320 ◽  
Author(s):  
Sajid Ali Ansari ◽  
S. G. Ansari ◽  
H. Foaud ◽  
Moo Hwan Cho
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Zno Nanostructures ◽  
Photoelectrochemical Performance ◽  
Carbon Doped ◽  
Visible Light Driven ◽  
Doped Zno ◽  
Visible Light Photocatalytic

Design of carbon doped ZnO nanostructures towards enhanced visible light driven photocatalytic and photoelectrochemical performance.

scholarly journals Pulsed Laser Deposition of Bismuth Vanadate Thin Films—The Effect of Oxygen Pressure on the Morphology, Composition, and Photoelectrochemical Performance

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1360
Author(s):  
Konrad Trzciński ◽  
Mariusz Szkoda ◽  
Maria Gazda ◽  
Jakub Karczewski ◽  
Adam Cenian ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Oxygen Pressure ◽  
Bulk Heterojunction ◽  
Pulsed Laser ◽  
Target Surface ◽  
Thin Layers ◽  
Bismuth Vanadate ◽  
Laser Deposition ◽  
Photoelectrochemical Performance ◽  
Breakdown Spectroscopy

Thin layers of bismuth vanadate were deposited using the pulsed laser deposition technique on commercially available FTO (fluorine-doped tin oxide) substrates. Films were sputtered from a sintered, monoclinic BiVO4 pellet, acting as the target, under various oxygen pressures (from 0.1 to 2 mbar), while the laser beam was perpendicular to the target surface and parallel to the FTO substrate. The oxygen pressure strongly affects the morphology and the composition of films observed as a Bi:V ratio gradient along the layer deposited on the substrate. Despite BiVO4, two other phases were detected using XRD (X-ray diffraction) and Raman spectroscopy—V2O5 and Bi4V2O11. The V-rich region of the samples deposited under low and intermediate oxygen pressures was covered by V2O5 longitudinal structures protruding from BiVO4 film. Higher oxygen pressure leads to the formation of Bi4V2O11@BiVO4 bulk heterojunction. The presented results suggest that the ablation of the target leads to the plasma formation, where Bi and V containing ions can be spatially separated due to the interactions with oxygen molecules. In order to study the phenomenon more thoroughly, laser-induced breakdown spectroscopy measurements were performed. Then, obtained electrodes were used as photoanodes for photoelectrochemical water splitting. The highest photocurrent was achieved for films deposited under 1 mbar O2 pressure and reached 1 mA cm−2 at about 0.8 V vs Ag/AgCl (3 M KCl). It was shown that V2O5 on the top of BiVO4 decreases its photoactivity, while the presence of a bulk Bi4V2O11@BiVO4 heterojunction is beneficial in water photooxidation.

scholarly journals Aerosol-Deposited BiVO4 Photoelectrodes for Hydrogen Generation

2020 ◽  
Author(s):  
Charline Wolpert ◽  
Thomas Emmler ◽  
Maria Villa Vidaller ◽  
Andreas Elsenberg ◽  
Kentaro Shinoda ◽  
...  
Keyword(s):  
Thin Films ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Renewable Energy Sources ◽  
Cold Spraying ◽  
Cost Effective ◽  
Aerosol Deposition ◽  
Bismuth Vanadate ◽  
Oxide Semiconductor ◽  
Photoelectrochemical Performance

Abstract Hydrogen generation from renewable energy sources will play a key role in the concerted endeavor to constrain climate change. One environmentally friendly route, powered by sunlight, is the photoelectrochemical water splitting cell (PEC). This technology employs electrodes coated with thin films of semiconductor materials to capture light and generate charge carriers that directly drive the water splitting reaction. Bismuth vanadate is a promising metal oxide semiconductor, as it absorbs visible light, and is abundant, non-toxic and cost-effective. The present study investigates the formation of bismuth vanadate thin films by the aerosol deposition (AD) method. Operating with layer formation at room temperature, AD offers advantages over other routes for the fabrication of photoactive thin film coatings, as no binders or sintering processes need to be applied. Furthermore, compared to traditional cold spraying, micrometer-sized particles can be used, resulting in coatings with thicknesses below 1 µm. Additionally, the lower kinetic energy of the feedstock powder particles enables the use of delicate substrates, such as FTO-coated glass, expanding the range of possible PEC device configurations. The process parameters explored in this study had considerable influence on the resulting coating microstructure, which in turn showed a significant impact on the photoelectrochemical performance.

Modification of a thin layer of α-Fe2O3 onto a largely voided TiO2 nanorod array as a photoanode to significantly improve the photoelectrochemical performance toward water oxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62611-62618 ◽  
Author(s):  
Lianwen Jia ◽  
Jiale Xie ◽  
Chunxian Guo ◽  
Chang Ming Li
Keyword(s):  
Thin Layer ◽  
Current Efficiency ◽  
Water Oxidation ◽  
Nanorod Array ◽  
Thin Layers ◽  
Applied Bias ◽  
Photoelectrochemical Performance ◽  
Tio2 Nanorod ◽  
Tio2 Nanorod Array

A largely voided TiO2 nanorod array was modified with Fe2O3 thin layers to deliver ∼3.3 times higher the applied bias photon-to-current efficiency than that of a plain TiO2 nanorod array.

Enhanced photocatalytic performance of bismuth vanadate assisted by polyoxometalates and phthalocyanine

2018 ◽  
Vol 42 (24) ◽  
pp. 19678-19684 ◽  
Author(s):  
Chunli Song ◽  
Zhanbin Jin ◽  
Fengyan Li ◽  
Miaomiao Zhen ◽  
Lu Xi ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Bismuth Vanadate

H3PW12O40 (PW12) and binuclear phthalocyanine (bi-CoPc) modified nanofilms PW12–BiVO4–bi-CoPc were prepared. Under illumination of visible light, PW12–BVO–bi-CoPc nanofilm exhibits a 3-fold enhancement in photocatalytic degradation of NO2.

Determining the Role of Oxygen Vacancies in the Photocatalytic Performance of WO3 for Water Oxidation

2019 ◽  
Author(s):  
Sacha Corby ◽  
Laia Francàs ◽  
Andreas Kafizas ◽  
James R Durrant
Keyword(s):  
Oxygen Vacancy ◽  
Charge Carrier ◽  
Water Oxidation ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Photoelectrochemical Performance ◽  
Solar Water Splitting ◽  
The Impact ◽  
Recombination Kinetics ◽  
Vacancy Concentrations

Oxygen vacancies are common to most metal oxides, whether intentionally incorporated or otherwise, and the study of these defects is of increasing interest for solar water splitting. In this work, we examine nanostructured WO<sub>3</sub> photoanodes of varying oxygen content to determine how the concentration of bulk oxygen-vacancy states affects the photocatalytic performance for water oxidation. Using transient optical spectroscopy, we follow the charge carrier recombination kinetics in these samples, from picoseconds to seconds, and examine how differing oxygen vacancy concentrations impact upon these kinetics. We find that samples with an intermediate concentration of vacancies (~2% of oxygen atoms) afford the greatest photoinduced charge carrier densities, and the slowest recombination kinetics across all timescales studied. This increased yield of photogenerated charges correlates with improved photocurrent densities under simulated sunlight, with both greater and lesser oxygen vacancy concentrations resulting in enhanced recombination losses and poorer J-V performances. Our conclusion, that an optimal – neither too high nor too low – concentration of oxygen vacancies is required for optimum photoelectrochemical performance, is discussed in terms of the impact of these defects on charge separation and transport, as well as the implications held for other highly doped materials for photoelectrochemical water oxidation.

Facet-Engineered Surface and Interface Design of Monoclinic Scheelite Bismuth Vanadate for Enhanced Photocatalytic Performance

ACS Catalysis ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 1024-1059 ◽  
Author(s):  
Sha Chen ◽  
Danlian Huang ◽  
Piao Xu ◽  
Xiaomin Gong ◽  
Wenjing Xue ◽  
...  
Keyword(s):  
Interface Design ◽  
Photocatalytic Performance ◽  
Bismuth Vanadate ◽  
Surface And Interface

scholarly journals Synergy of Photocatalysis and Adsorption for Simultaneous Removal of Hexavalent Chromium and Methylene Blue by g-C3N4/BiFeO3/Carbon Nanotubes Ternary Composites

2019 ◽  
Vol 16 (17) ◽  
pp. 3219 ◽  
Author(s):  
Huiwen Huo ◽  
Xinjiang Hu ◽  
Hui Wang ◽  
Jiang Li ◽  
Guangyu Xie ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Methylene Blue ◽  
Photocatalytic Performance ◽  
Bismuth Ferrite ◽  
Reduction Rate ◽  
Magnetic Composite ◽  
Electron Hole ◽  
Graphite Phase ◽  
Combined Application ◽  
Effects Of Ph

A novel graphite-phase carbon nitride (g-C3N4)/bismuth ferrite (BiFeO3)/carbon nanotubes (CNTs) ternary magnetic composite (CNBT) was prepared by a hydrothermal synthesis. Using this material, Cr(VI) and methylene blue (MB) were removed from wastewater through synergistic adsorption and photocatalysis. The effects of pH, time, and pollutant concentration on the photocatalytic performance of CNBT, as well as possible interactions between Cr(VI) and MB species were analyzed. The obtained results showed that CNTs could effectively reduce the recombination rate of electron-hole pairs during the photocatalytic reaction of the g-C3N4/BiFeO3 composite, thereby improving its photocatalytic performance, while the presence of MB increased the reduction rate of Cr(VI). After 5 h of the simultaneous adsorption and photocatalysis by CNBT, the removal rates of Cr(VI) and MB were 93% and 98%, respectively. This study provides a new theoretical basis and technical guidance for the combined application of photocatalysis and adsorption in the treatment of wastewaters containing mixed pollutants.

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