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Recent progresses in the design of BiVO4-based photocatalysts for efficient solar water splitting
摘要： Photocatalysis and photoelectrocatalysis are both considered as promising routes to solve energy and environmental crises. Particularly, photoelectrochemical (PEC) water splitting has been extensively studied in the search for sustainable ways of converting solar energy into chemical energy to produce energy-dense fuel with minimal carbon footprint. Bismuth vanadate (BiVO4) has attracted a lot attention in recent years due to its visible-light activity, favorable conduction and valence band edge positions, and low-cost facile synthesis route. However, BiVO4 still suffers from low carrier separation efficiency and slow oxygen evolution kinetics on its surface. To overcome these weaknesses, various modification strategies, including nanostructural morphology control, element doping, heterostructures (particularly Z-scheme), plasmonic enhancement and surface passivation, have been proposed and implemented to improve its PEC activity. This short review summarizes the most recent advances on the designs of BiVO4-based photocatalysts and photoanodes. Some of the best-performing BiVO4–based photo-electrode structures to date are demonstrated, and the critical parameters that contribute to these outstanding performances are discussed.
关键词： Solar energy harvesting,BiVO4,Photocatalyst,Photoelectrochemical water splitting
更新于2025-09-19 17:15:36
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Hierarchical biomimetic BiVO4 for the treatment of pharmaceutical wastewater in visible-light photocatalytic ozonation
摘要： Photocatalytic ozonation is an attractive advanced oxidation process for wastewater treatment, but highly active catalysts with strong response to visible light are urgently needed to push forward its practical application. In this study, a hierarchical biomimetic monoclinic bismuth vanadate (BiVO4) with leaves morphology was synthesized by a hydrothermal method, and employed as catalyst for oxalic acid and penicillin degradation in photocatalytic ozonation. The results show that the organics degradation was more efficient using leaves shaped BiVO4 as catalyst than the bulk shaped one in photocatalytic ozonation and the synergy index is ranged from 2.8 to 3.3, indicating a superior positive synergistic effect between photocatalysis and ozonation. The higher activity of the leaves shaped BiVO4 was probably attributed to the distinctive biomimetic morphology and preferable band structure with more negative CB potential. Mechanism studies suggested that the main reactive species were h+ and ?OH for the degradation of persistent oxalic acid in photocatalytic ozonation. In addition, the effect of ozone concentration and inorganic ions and reusability of the material were also intensively investigated.
关键词： BiVO4,biomimetic morphology,photocatalytic ozonation,synergies,photogenerated hole
更新于2025-09-19 17:15:36
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Enhanced Photoelectrochemical Performance of BiVO4 by a NiMoO4 Modification
摘要： In this work, porous BiVO4 thin films were deposited on the FTO glass through a spin-coating deposition method and their photoelectrochemical (PEC) properties were investigated. Further, the BiVO4 thin film was modified with a NiMoO4 thin layer for enhancing its PEC activity. It is demonstrated that the applied bias photo-to-current conversion efficiency is increased by 63% after a surface modification, which is ascribed to both the formation of a p–n junction and the suppressed carrier recombination rate by terms of the electrochemical impedance spectroscopy. Finally, a schematic band model is also proposed to clarify the charge carrier transfer mechanism which is responsible for the enhanced PEC performance.
关键词： photoelectrochemical,NiMoO4,BiVO4,water splitting
更新于2025-09-19 17:15:36
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Synthesis of BiVO4/WO3 composite film for highly efficient visible light induced photoelectrocatalytic oxidation of norfloxacin
摘要： In this study, we synthesized BiVO4/WO3 composite film via a hydrothermal method and successive ionic layer adsorption and reaction (SILAR) for photoelectrocatalytic (PEC) degradation of norfloxacin (NOR) under visible light irradiation (λ > 420 nm). The BiVO4/WO3 composite film was characterized by various techniques in details. These results suggested that BiVO4 was successfully assembled onto the WO3 film surface. The BiVO4/WO3 composite film exhibited enhanced PEC performance and the apparent rate constant for degradation of NOR was estimated to be 2.68 × 10-3 min-1, which was 3.52 and 2.39 times higher than that of WO3 and BiVO4 film, respectively. The superior PEC performance could be ascribed to the formation of n-n junction facilitating the interfacial charge transfer and separation rate, resulting in the enhanced light-harvesting capability. The generated h+, ?O2- and ?OH radicals were responsible for the PEC degradation of NOR confirmed by the radicals trapping experiments and ESR spin-trap technique. Analysis of the degradation intermediates implied that the piperazine ring of the norfloxacin was mainly attacked during the visible-light-driven degradation process.
关键词： SILAR,photoelectrocatalytic oxidation,BiVO4/WO3 composite film,norfloxacin
更新于2025-09-19 17:15:36
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Enhanced photocatalytic activity of SiC modified by BiVO <sub/>4</sub> under visible light irradiation
摘要： SiC-BiVO4-P and SiC-BiVO4-H composites have been prepared by precipitation method and hydrothermal method, respectively. Rod-like BiVO4 particles dispersed on the surface of micro-sized SiC particles homogeneously in SiC-BiVO4-H. Due to the formed heterostructure between BiVO4 and SiC, photo-generated electrons and holes were effectively separated. Under visible light irradiation, SiC-BiVO4-H exhibited the best performance for photocatalytic oxidation of Rhodamine B, achieved about 7.5 times improvement in photocatalytic degradation rate constants compared with that of the pristine SiC powder. The possible photocatalysis mechanism of SiC/BiVO4 related to the band positions of the semiconductors under visible light irradiation was also discussed in detail. In addition, the radicals trapping experiments revealed that all three radicals (holes, OH, and O2-) play an important role in the Rhodamine B degradation.
关键词： SiC,BiVO4,RhB,heterostructure,visible light
更新于2025-09-19 17:15:36
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A portable non-enzyme photoelectrochemical ascorbic acid sensor based on BiVO4 electrode under 20?W LED light
摘要： BiOI film was electrodeposited deposited on fluorine doped tin oxide (FTO), then it was transformed into a nanoporous BiVO4 film by annealing at 420 ?C. The BiVO4/FTO electrode is used as photoelectrochemical (PEC) sensor to detect ascorbic acid (AA) for the first time. Under illumination of low power 20 W LED lamp, the current density of the sensor increases with the increase of AA concentration. The proposed PEC sensor exhibited a sensitive detection for AA in a wide range from 5 μM to 300 μM with a low detection limit of 1 μM (S/N=3) and sensitivity of 293 μA mM-1 cm-2. A portable AA detection device was constructed with a 20W LED lamp as the light source, BiVO4/FTO electrode as an anode, Pt as a cathode, and ammeter as a photoelectric signal receiver. The concentration of AA detected by this device is close to that measured by the electrochemical workstation (RSD<10%), which makes the sensor practical and portable.
关键词： Nanoporous BiVO4,Ascorbic acid,Portable device,Photoelectrochemical sensor
更新于2025-09-19 17:13:59
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Fabrication of pyramid-BiVO4/CdSe composite with controlled surface oxygen vacancies boosting efficient carriersa?? separation for photocathodic protection
摘要： In order to solve the bottleneck problem of weak efficiency of carriers’ separation and transfer in BiVO4 photocatalyst, a novel pyramid-BiVO4 with sufficient oxygen vacancies was successfully synthesized via a low-temperature solvothermal method. By adjusting solution pH and adding SDBS surfactant, the prepared samples could have a variety of controllable morphologies and exposed {001} facets, which were determined by SEM, XRD, and BET methods. XPS O1s peak and ESR signals indicated that pyramid-BiVO4 exhibited higher oxygen vacancies concentration than others. Besides, CdSe quantum dots (QDs) were introduced to construct BiVO4/CdSe heterojunctions composite based photoanode to further promote solar harvesting and carrier separation. The photoelectrochemical experimental results showed that 304 stainless steel (304SS) coupled with 8V-BC photoanode showed an enhanced photocurrent density (608 μA?cm-2) and maximum potential drop (708 mV), which were equivalent to 5.06 times and 2.10 times that of the original BiVO4, respectively. Mechanism study illustrated that the ultra-high performance of the 8V-BC photoanode was attributed to the synergistic effect of enriched oxygen vacancies, exposed {001} facets, enlarged visible light absorption and larger specific surface area.
关键词： oxygen vacancies,photocathodic protection,CdSe,BiVO4,morphology controlled
更新于2025-09-19 17:13:59
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Femtomolar sensing of Alzheimer's tau proteins by water oxidation-coupled photoelectrochemical platform
摘要： Alzheimer’s disease (AD) is the most prevalent neurodegenerative disorder. A key pathogenic event of AD is the formation of intracellular neurofibrillary tangles that are mainly composed of tau proteins. Here, we report on ultrasensitive detection of total tau (t-tau) proteins using an artificial electron donor-free, BiVO4-based photoelectrochemical (PEC) analysis. The platform was constructed by incorporating molybdenum (Mo) dopant and iron oxyhydroxide (FeOOH) ad-layer into the BiVO4 photoelectrode and employing a signal amplifier formed by horseradish peroxidase (HRP)-triggered oxidation of 3,3′-diaminobenzidine (DAB). Despite the absence of additional electron suppliers, the FeOOH/Mo:BiVO4 conjugated with the Tau5 antibody produced strong current signals at 0 V (vs. Ag/AgCl, 3M NaCl) under the illumination of a white light-emitting diode. The Mo extrinsic dopants increased the charge carrier density of BiVO4-Tau5 by 1.57 times, and the FeOOH co-catalyst promoted the interfacial water oxidation reaction of Mo:BiVO4-Tau5 by suppressing charge recombination. The introduction of HRP-labeled Tau46 capture antibodies to the FeOOH/Mo:BiVO4-Tau5 platform produced insoluble precipitation on the transducer by accelerating the oxidation of DAB, which amplified the photocurrent signal of FeOOH/Mo:BiVO4-Tau5 by 2.07-fold. Consequently, the water oxidation-coupled, FeOOH/Mo:BiVO4-based PEC sensing platform accurately and selectively recognized t-tau proteins down to femtomolar concentrations; the limit of detection and limit of quantification were determined to be 1.59 fM and 4.11 fM, respectively.
关键词： Alzheimer’s disease,water oxidation,Femtomolar sensitivity,tau proteins,BiVO4
更新于2025-09-19 17:13:59
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Elucidating the Pulsed Laser Deposition Process of BiVO <sub/>4</sub> Photoelectrodes for Solar Water Splitting
摘要： BiVO4 thin films for the use as photoelectrodes for solar water splitting are prepared by pulsed laser deposition (PLD), a powerful technique to synthesize compact multinary metal oxides films with a high electronic quality. Here, the PLD process of BiVO4 films by ablating a BiVO4 target is systematically elucidated with a special focus on deviations from an ideal stoichiometric target-to-substrate material transfer. By correlating the V:Bi ratio of the films with their charge carrier transport properties and PEC performance, AM1.5 sulfite oxidation photocurrents of ~2.4 mA cm-2 at E = 1.23 V vs. RHE with stoichiometric films are achieved without any deliberate doping or surface modification. In addition, we prepare BiVO4 photoelectrodes for the first time by the alternating ablation of Bi2O3 and V2O5 targets. This approach is found to be an attractive alternative route to control the cation stoichiometry and produces BiVO4 films that generate AM1.5 sulfite oxidation photocurrents of up to 2.6?mA cm-2 at E = 1.23 V vs. RHE. Our results provide important insights into the PLD process of ternary oxide semiconductors and help to accelerate the synthesis and investigation of new multinary metal oxide photoelectrodes.
关键词： pulsed laser deposition,solar water splitting,stoichiometry,BiVO4,photoelectrodes
更新于2025-09-19 17:13:59
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The cooling rate controlled (040) facets of BiVO<sub>4</sub> particles and its characterization
摘要： The photogenerated carriers of BiVO4 are easily recombined and desired to be improved effectively. In this paper, the separation degree was improved by prolonging the cooling time in the process of BiVO4 synthesis. When the cooling rate was 50℃/h, the performance of BiVO4 particles was significantly optimized, including the highest peak of (040) facets, the improvement of morphology, the increase of carriers separation and the optimum degradation of doxycycline. When the degradation time was only 15min, doxycycline in water could be effectively removed with a removal rate of 63%. These studies are valuable for improving the chemical properties of BiVO4 and broadening its application.
关键词： degradation,(040) facets,BiVO4,cooling rate
更新于2025-09-16 10:30:52