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Visible light driven photoelectrocatalysis on a FTO/BiVO4/BiOI anode for water treatment involving emerging pharmaceutical pollutants
摘要： Contamination of water bodies by harmful and recalcitrant organic substances is a global challenge. A promising technique for removing these organics from water/wastewater is photoelectrocatalytic oxidation which combines electrolytic and photocatalytic processes. Herein, we report the degradation of emerging pharmaceutical pollutants e acetaminophen and cipro?oxacin e at a BiVO4/BiOI photoanode under visible irradiation via photoelectrocatalytic process. The BiVO4/BiOI was electrodeposited on a FTO glass and characterised with XRD, SEM, EDS and diffusive re?ectance UVeVis. The results con?rmed the successful electrodeposition of BiVO4/BiOI on the glass substrate. Mott-Schotty plots con?rmed the formation of p-n heterojunction between the two electrodeposited semiconductors. The calculated charge carrier density of BiVO4/BiOI was higher than those of pristine BiVO4 and BiOI. The binary electrode also gave improved photocurrent response compared with unitary electrodes. Degradation ef?ciencies of 68% and 62% were achieved upon the application of the prepared photoanode (FTO/BiVO4/BiOI) in PEC degradation of acetaminophen and cipro?oxacin respectively using a bias potential of 1.5 V within 2 h. A synthetic pharmaceutical wastewater containing a mixture acetaminophen and cipro?oxacin was also treated with the photoanode. The photoanode was also effective in the degradation of dye. The ?ndings of this study suggest the suitability of the prepared photoanode for the photoelectrocatalytic degradation of organic pharmaceutical pollutants in wastewater.
关键词： Cipro?oxacin,p-n heterojunction photoanode,Photoelectrocatalytic degradation,Bismuth oxyiodide,Acetaminophen,Bismuth vanadate
更新于2025-11-14 14:48:53
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A novel growth control of nanoplates WO3 photoanodes with dual oxygen and tungsten vacancies for efficient photoelectrochemical water splitting performance
摘要： Recently, there has been attractive attention over the defect-engineering where the optimum extent of oxygen deficiency has been considered as an effective route towards enhancing the solar-driven water oxidation photocurrent. In this study, a nanoplate-like tungsten oxide with dual oxygen and tungsten vacancies (WO3-x) was successfully fabricated on tungsten foil by acid-mediated hydrothermal treatment to highly improve the photoelectrochemical (PEC) performance of WO3-x photoanode. Thermal annealing at 550 °C in air led to an oxygen deficient surface with a sub-stoichiometric by phase transformation from orthorhombic WO3·.nH2O to γ-monoclinic. However, the optimum number of oxygen vacancies in WO3-x fabricated at 2 h (W-2 h) with compact, porous and uniform nanoplate film that provide a large surface area for efficient charge collecting capability, caused an enhanced photocurrent density of 4.12 mA/cm2 (41.2 mA/W) at 1.6 V vs. Ag/AgCl, as compared to W-3 h (2.59 mA/cm2, or 25.9 mA/W) and W-30 min (1.79 mA/cm2 or 17.9 mA/W). Finally, local variations in dual oxygen and tungsten vacancies and in the electronic band structure of a WO3-x thin film was analyzed with ultraviolet photoelectron spectroscopy (UPS) and UV–visible diffuse reflectance spectroscopy (UV-DRS).
关键词： Photoelectrocatalytic,Water splitting,Growth control,Oxygen and tungsten vacancies,Nanoplates,WO3-X
更新于2025-09-23 15:21:21
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Shape-dependent activity of anisotropic Ag nanostructures supported on TiO2 for the photoelectrocatalytic water oxidation
摘要： Herein, we report shape-dependent photoelectrocatalytic activity of Ag/Ag2O nanostructures supported on pristine or nitrogen-doped TiO2 (NTiO2). Isotropic (spherical) and anisotropic (cubic and triangular) nanocrystals of Ag/Ag2O nanocrystals were fabricated using complexing and surface directing agents. Microscopic images confirmed the formation of nanospheres (～ 50–60 nm), nanocubes (～ 50–70 nm), triangular nanoplates (～ 40–60 nm). The X-ray photoelectron spectroscopy indicated the presence of metallic silver (Ag0) and oxidized silver (Ag+). The as-prepared photoelectrodes were illuminated by Ultraviolet–Visible (λ = 300–600 nm) or visible radiations (λ = > 420 nm), and photoelectrochemical oxidation of water was examined. The findings indicate a significant correlation in the shape of Ag/Ag2O nanostructures, the incident wavelength, and the photoelectrochemical performance. In addition, different performance trend was discerned under Ultraviolet–Visible and visible excitations with respect to the amount of deposited Ag/Ag2O. The variation in activity observed with different shapes of Ag/Ag2O was correlated to enhanced optical property, arising due to the anisotropic structure, and electrical conductivity.
关键词： Photoelectrocatalytic activity,NTiO2,Water oxidation,Shape-dependent,Ag/Ag2O nanostructures,TiO2
更新于2025-09-23 15:21:01
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Enhancing interfacial charge transfer on novel 3D/1D multidimensional MoS2/TiO2 heterojunction toward efficient photoelectrocatalytic removal of levofloxacin
摘要： Structure-controlled visible light driven photo-anode with high catalytic performance, plays important roles in environmental pollutants treatment. In this work, a mild hydrothermal assisted anodization approach has been reported to design an integrated self-assembled 3D flower-like MoS2/1D TiO2 nanotube arrays (NTAs) hierarchical electrode. The constructed multidimensional electrode not only broadened the absorption spectrum response range but also promoted rapidly electron-hole pairs separation, exhibiting the excellent photoelectron catalytic (PEC) performance and stability in the degradation of target pollutants, which the photocurrent conversion efficiency was 6.5 times higher than that of pure TiO2. Furtherly, a comprehensive mechanism was proposed to explain the charge transfer on the interface of intimate integration of 3D/1D hybrid nanostructure towards PEC properties in terms of the energy band structures and DFT. Furthermore, the photo-generated active species (?OH and ?O2-) have been proved by electron paramagnetic resonance spectroscopy and fluorescence probe over the composites. Thus, this work could provide an effective strategy to design multidimensional coupled heterojunction materials toward solar energy conversion for environmental purification.
关键词： Interfacial charge transfer,Photoelectrocatalytic,Active radicals,DFT,3D/1D hybrid nanostructures
更新于2025-09-23 15:21:01
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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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In situ synthesis and oriented growth of flowerlike SrTiO3 on Ti foil with enhanced photoelectrochemical performance
摘要： The oriented growth of flowerlike strontium titanate (SrTiO3) with highly efficient photoelectrocatalytic oxygen evolution reaction performance afforded a high limiting current density of 3.38 mA/cm2 at 600 mV (vs. the reversible hydrogen electrode), and low overpotential and Tafel slope (84 mV/dec) in 1 M KOH solution. Ti foil as a substrate can significantly enhance electron transfer, and flowerlike SrTiO3 with a highly exposed (110) crystal surface was controlled by NaOH concentration and HF. Therefore, the use of Ti and F- as the substrate and the shape-directing additive, respectively, is a feasible and simple strategy to induce a high-energy surface on a photoelectrocatalyst for photoelectrocatalytic splitting of water.
关键词： Orientation growth,Flowerlike strontium titanate,Photoelectrocatalytic
更新于2025-09-19 17:15:36
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Bio-proton coupled semiconductor/metal-complex hybrid photoelectrocatalytic interface for efficient CO <sub/>2</sub> reduction
摘要： Aimed at high-efficiency biomimetic CO2 photoelectrochemical conversion, a bio-proton coupling metal-complex/semiconductor hybrid photoelectrocatalytic interface (Ru-BNAH/TiO2/Cu2O) was constructed by covalently modifying an in situ proton-transfer functionized molecular catalyst (Ru-BNAH) on the surface of a TiO2/Cu2O composite semiconductor substrate electrode. Due to the excellent proton coupling of the bio-proton carrier, the light current density in a CO2 atmosphere of the prepared Ru-BNAH/TiO2/Cu2O photoelectrocatalytic interface was twice as high as that without a proton carrier under the same conditions. Simultaneously, based on the excellent photosensitivity of the metal oxide substrate, the photogenerated electrons could rapidly transfer to the molecular catalyst for efficient CO2 reduction in a water medium. After 8 h irradiation at ?0.9 V potential, the Ru-BNAH/TiO2/Cu2O photoelectrocatalytic interface produced 409.5 μmol formic acid, which was 2.44 times more than that without a proton transfer carrier. In addition, the in situ UV-visible absorption spectra and in situ Raman spectra indicated that the proton transport carrier supplied protons during CO2 reduction. Moreover, the generation of HCOO? in CO2-saturated D2O medium confirmed the proton (H) originated from the proton transfer carrier rather than the solvent (D2O).
关键词： CO2 reduction,formic acid,bio-proton coupling,Ru-BNAH/TiO2/Cu2O,photoelectrocatalytic interface
更新于2025-09-11 14:15:04
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Photoelectrocatalytic Reduction of Carbon Dioxide to Methanol using CuFe2O4 Modified with Graphene Oxide under Visible Light Irradiation
摘要： Photoelectrocatalytic reduction of CO2 into valuable products can provide energy in a sustainable way with levelling off the concentration of CO2 in our environment. In this study, graphene oxide (GO) incorporated with copper ferrite (CuFe2O4) has been employed to enhance photoelectrocatalytic CO2 reduction under visible light. The TEM and XPS characterization indicated a strong interaction between the CuFe2O4 and GO in the hybrid catalyst. The GO incorporation reduced the e-/h+ recombination in the hybrid catalyst by trapping the photoexcited electrons from CuFe2O4 leading to high methanol yield of 28.8 μmole/Lcm-2 at 20.5% quantum efficiency. The incident photon current efficiency (IPCE) and Faradaic efficiency for methanol formation were observed 8.02% and 87% respectively. The results showed that the photoelectrocatalytic activity for CO2 reduction can be improved by incorporating GO with CuFe2O4 and it provides a universal platform to fabricate GO-CuFe2O4 based hybrid photocatalyst with promising applications in CO2 reduction.
关键词： Visible light irradiation,CuFe2O4,CO2,Graphene oxide,Photoelectrocatalytic reduction,Methanol
更新于2025-09-09 09:28:46
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Enhanced visible-light photoelectrochemical hydrogen evolution through degradation of methyl orange in a cell based on coral-like Pt-deposited TiO2 thin film with sub-2 nm pores
摘要： TiO2 nanoparticles exhibit good photocatalytic activity for hydrogen evolution through water splitting; however, they demonstrate weak activity under visible light irradiation due to the wide band gap of TiO2. Deposition with noble metals such as platinum, as cocatalyst, led to the red-shift of the absorption edge of rutile TiO2; however, its activity is not significant for the photoelectrochemical (PEC) degradation of azo dyes such as methyl orange (MO). Herein, we investigated the photoelectrocatalytic degradation reaction of MO in a PEC cell based on Pt-deposited TiO2 thin film. The performance of the cell increased through the formation of mesoporous coral-like structures with sub-2 nm pores and the formation of defect states on the electrode surface. UV–vis studies confirmed, when methanol was added, the PEC cell exhibited a much higher MO degradation efficiency (99.6% after 28 min UV irradiation) than in the absence of methanol (64.7%). GC–MS studies confirmed the oxidation of methanol to formaldehyde, reacting on the electrode surface, followed by the reduction of the protons into hydrogen over the Pt sites. Also, the conversion of formaldehyde to formic acid and formic acid to CO2 are possible mechanisms to increase the hydrogen evolution rate to 418 μmol/h under visible light irradiation. Reaction of adsorbed active species within the surface of coral-like TiO2 structures with sub-2 nm pores provides high activity of the proposed PEC cell for visible-light-driven water splitting. These research studies may be continued to the design of other efficient semiconductor photocatalysts.
关键词： Photoelectrocatalytic activity,Photoelectrochemical cell,Coral-like TiO2 nanopores,Hydrogen production,Dye degradation
更新于2025-09-04 15:30:14
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3D heterostructured Ti-based Bi2MoO6/Pd/TiO2 Photocatalysts for High-Efficiency Solar Light Driven Photoelectrocatalytic Hydrogen Generation
摘要： Hydrogen fuel generation using solar light via photoelectrochemical (PEC) methods can help meet growing global energy demands and decrease environmental pollution. The key to efficient PEC hydrogen production is the synthesis of solar light driven photoelectrodes with efficient charge carrier separation. Here, we designed and prepared a ternary Bi2MoO6/Pd/TiO2 photoelectrode composed of Bi2MoO6 nanosheets, Pd nanoparticles (NPs) and TiO2 nanotube arrays (NTAs) on a Ti substrate using electrochemical methods. This novel photoelectrode had good visible light absorbance and significantly improved PEC hydrogen production rates (~5 and > 15 times higher under UV-vis and visible light irradiation, respectively, compared with TiO2 NTAs). The interfacial charge transfer mechanism of Bi2MoO6/Pd/TiO2 NTAs was comprehensively studied by comparing its PEC and photoelectrocatalytic performance with other TiO2 NTAs (i.e. Pd/TiO2 NTAs, Bi2MoO6/TiO2 NTAs and Pd/Bi2MoO6/TiO2 NTAs). For Bi2MoO6/Pd/TiO2 NTAs, Pd NPs homogeneously dispersed across the inside and outside of TiO2 nanotube walls helped to tightly anchor Bi2MoO6 nanosheets onto the TiO2 surface, forming a ternary 3D heterostructure. This structure facilitated interfacial electron injection from Bi2MoO6 to TiO2, accelerating the separation of the photogenerated electron-hole pairs. And significantly enhanced the photocurrent response and hydrogen production rate were achieved compared with other TiO2 NTAs. This 3D ternary semiconductor/metal/semiconductor heterojunction provides a viable approach for designing and synthesizing highly efficient novel photocatalysts that can effectively utilize solar energy.
关键词： TiO2 nanotube arrays,Pd nanoparticles,Bi2MoO6 nanosheets,Photoelectrocatalytic hydrogen production,Ternary photocatalyst
更新于2025-09-04 15:30:14