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Constructing 1D CdS nanorod composites with high photocatalytic hydrogen production by introducing the Ni-based cocatalysts
摘要： Various 1D CdS nanorod composites (e.g. NiO/CdS, NiS/CdS and Ni(OH)2/CdS) were constructed by anchoring Ni-based cocatalysts on the surface of CdS nanorods. Photocatalytic reforming of lactic acid in aqueous medium for hydrogen generation using CdS composites was investigated, and Ni(OH)2/CdS sample displayed the best activity. Evidently, Ni(OH)2 cocatalyst can offer a suitable potential position to boost the transfer of photo-generated electrons and much more active sites. Furthermore, the result of LSV curves discloses that the higher photocatalytic activity is due to the smaller onset overpotential, which can accelerate the reduction of protons into H2. This work provides a full comprehension of the mechanism that Ni species cocatalysts improve photocatalytic activity.
关键词： cocatalyst,hydrogen production,CdS nanorods,visible light,Ni-based
更新于2025-09-23 15:21:21
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Revisiting cocatalyst/TiO2 photocatalyst in blue light photothermalcatalysis
摘要： Coupling heat into photocatalysis (PC) has been found more efficient than PC for removal of volatile organic compounds (VOC). Therein, photothermal synergy induced photothermalcatalysis (PTC) sometimes tells different stories from PC. In this work, we revisit ST-01 TiO2 photocatalyst as photothermalcatalyst under blue light at 333 K and further investigate the role of surface grafted cocatalyst (CrxO, CoxO, CuxO, Pt) in catalytic removal of gaseous acetaldehyde pollutant. By comparison on the amount of cocatalyst, for PC, more CrxO cocatalyst (3 wt%) is favored for higher removal efficiency of acetaldehyde. For PTC, less CrxO cocatalyst (0.3 wt%) is favored. By further comparison on the type of cocatalyst, for PC, hole cocatalyst (CrxO and CoxO) gives inferior performance to that of electron cocatalyst (CuxO and Pt). For PTC, hole cocatalyst gives superior performance to that of electron cocatalyst. The difference between PC and PTC lies in synergistic effect between defect-related blue-light absorption, cocatalyst induced interfacial charge transfer and matched surface red-ox reaction rate. This work may provide new insight into the design and development of photothermalcatalyst for VOC removal.
关键词： Cocatalyst,VOC removal,Photothermal synergy,Photocatalytic,Photothermalcatalytic
更新于2025-09-23 15:21:01
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Heterostructures of mesoporous TiO2 and SnO2 nanocatalyst for improved electrochemical oxidation ability of Vitamin B6 in pharmaceutical tablets
摘要： The detection of water soluble vitamins using electrochemical method is widely established in pharmaceutical quality control laboratories, and especially the recent advances in hybrid heterostructure nanomaterials has devoted to enhance the significant analytical parameters like sensitivity, selectivity and fast response time. Herein, we report the synthesis of a hybrid heterostructure comprising SnO2 nanoparticles supported mesoporous TiO2, and the obtained nanocomposite were fabricated over glassy carbon electrode (GCE) for the electrochemical oxidation of vitamin B6 in pharmaceutical tablets. The designed SnO2-TiO2/GC modified electrode exhibits well-defined oxidation peak with lowering over-potential and larger signal response compared to the pristine counterparts, and it is mainly due to the formation of abundant active surface layer offered by SnO2 cocatalyst, and thus significantly enhances the electrochemical surface area. Differential pulse voltammetry (DPV) measurements revealed a sharp increase in the anodic peak current upon addition of increasing concentration of vitamin B6. The analytical performance of the modified electrode displayed a wide linear range (0.1 - 31.4 μM), high selectivity, and excellent sensitivity (759.73 μA mM-1 cm-2) with low detection limit (35 nM). Thus, the resultant mesoporous hybrid nanocatalyst provides an efficient electrochemical platform for determination of various potential analytes.
关键词： electrochemical sensor,Tin oxide (SnO2) cocatalyst,mesoporous,Titanium dioxide (TiO2),Vitamin B6
更新于2025-09-19 17:15:36
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Structure and Photocatalytic Activity of PdCrOx Cocatalyst on SrTiO3 for Overall Water Splitting
摘要： The mechanism of PdCrOx multi-component cocatalyst formation on SrTiO3 was investigated using transmission electron microscopy, X-ray absorption fine structure spectroscopy and X-ray photoelectron spectroscopy. The PdCrOx/SrTiO3 samples were synthesized by a photodeposition method under UV light irradiation (λ > 300 nm) for various time periods (0–5 h). The fine structure and valence state of the Pd species of PdCrOx nanoparticles were varied from Pd oxide to a mixture of metallic Pd and oxidized Pd species with an increase in the irradiation time. The overall water-splitting activity of PdCrOx was strongly dependent on the photoirradiation time during deposition. Although longer photoirradiation time during preparation did not influence the H2 evolution activity of PdCrOx/SrTiO3 from aqueous methanol solution, it was effective in suppressing the O2 photoreduction activity, which is one of the backward reactions during overall water splitting.
关键词： cocatalyst,semiconductor photocatalyst,water splitting
更新于2025-09-19 17:15:36
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Copper Tungstate (CuWO4) Nanoflakes Coupled with Cobalt Phosphate (Co-Pi) for Effective Photoelectrochemical Water Splitting
摘要： Photoelectrochemical (PEC) water splitting provides us a green way to convert and utilize solar energy. In this work, Co-Pi was electrochemically deposited onto CuWO4 nanoflakes (NFs) via a cyclic voltammetry (CV) method to enhance the photocatalytic performance of CuWO4 toward PEC water splitting. The results demonstrated that the photocurrent density as well as the charge-transfer efficiency was improved within the entire potential range. Besides, the CuWO4/Co-Pi exhibited an enhanced stability over the bare CuWO4 in the phosphate buffer solution (pH 7) and an extremely high Faradaic efficiency (ca. 96%). Our work reveals that combination of CuWO4 with Co-Pi is a feasible way to further enhance the performance of CuWO4 photoanode toward PEC OER.
关键词： Photoelectrochemical water splitting,oxygen evolution reaction,copper tungstate,electrochemical cocatalyst,cobalt phosphate
更新于2025-09-16 10:30:52
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A new photocatalyst based on Co(CO3)0.5(OH)·0.11H2O/Bi2WO6 nanocomposites for high-efficiency cocatalyst-free O2 evolution
摘要： The practical application of photocatalytic water splitting is essentially limited by the slow kinetic nature of the water oxidation process. Therefore, it is highly desirable but challenging to explore a low-cost and high-efficiency water oxidation catalyst for the aim of commercialization and industrialization. We herein report the first-time synthesis of a novel and high-efficiency visible-light-driven photocatalyst composed of flower-like Co(CO3)0.5(OH)·0.11H2O (CCO) nanowires and Bi2WO6 (BWO) nanosheets, i.e. CCO/BWO nanocomposite, via a facile hydrothermal method. Without utilizing any additional cocatalyst, the composite of CCO/BWO in 30% weight ratio exhibits extraordinarily high photoactivity and photostability towards O2 evolution, achieving an average O2 generation rate of 953 μmol h?1 g?1 under visible-light irradiation (λ > 420 nm).
关键词： Bi2WO6,Nanocomposite,Cocatalyst-free,Photocatalytic O2 evolution,Co(CO3)0.5(OH)·0.11H2O
更新于2025-09-09 09:28:46
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Cooperative effect between BaTiO3 and CaFe2O4 in a cocatalyst-free heterojunction composite for improved photochemical H2 generation
摘要： A series of novel BaTiO3/CaFe2O4 heterojunction composites with different weight ratios of CaFe2O4 vs BaTiO3 was successfully fabricated by sonication-calcination method using the pre-prepared BaTiO3 and CaFe2O4 powders synthesized in hydrothermal and sol-gel methods, respectively. The composites were well characterized using XRD, UVevis DRS, SEM, TEM, EDS and XPS to substantiate that BaTiO3 and CaFe2O4 coexist in the heterojunction composite. The highest photocatalytic hydrogen generation rate was obtained for BaTiO3/CaFe2O4 (40 wt%) compared to either of its individual counterparts and this improvement indicated the existence of a cooperative effect between BaTiO3 and CaFe2O4 in the heterojunction. Based on UV-vis-DRS, photoluminescence and time-resolved fluorescence lifetime measurements, the cooperative effect between BaTiO3 and CaFe2O4 originated from the improved photoresponse in the visible light region and efficient separation of the photogenerated electronehole pairs augmenting their availability for the photocatalytic reaction. A plausible photocatalytic mechanism was also deduced using electrochemical impedance spectroscopy measurements, describing the migration direction of the separated charge carriers. Moreover, the best composite BaTiO3/CaFe2O4 (40 wt %) exhibited fairly stable photoactivity for H2 production using the sacrificial agent (Na2S and Na2SO3) without the assistance of any noble metals as cocatalysts.
关键词： Cocatalyst free,BaTiO3/CaFe2O4 composite,Hydrogen evolution,Sonication-calcination method,Heterojunction
更新于2025-09-09 09:28:46
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Effect of thickness of Cr layer on Ag cocatalyst surface for highly selective photocatalytic conversion of CO <sub/>2</sub> by H <sub/>2</sub> O
摘要： In this study, we developed a Ag–Cr core–shell-structured (Ag@Cr) cocatalyst that modified the surface of the Ga2O3 photocatalyst. Compared to results provided by modifications with Ag cocatalysts and M–Cr dual cocatalysts (M = Au, Cu, Pd, and Pt), this change significantly improved the formation rate of CO and selectivity toward CO evolution in the photocatalytic conversion of CO2 by the electron donor H2O. As a result of this modification, the Cr(OH)3?xH2O shell changed to Cr(OH)x(CO3)y during the photocatalytic conversion. Furthermore, the thickness of the Cr(OH)3?xH2O shell was found to influence the photocatalytic performance. More specifically, Cr(OH)3?xH2O shells that were too thick or too thin were not beneficial to the CO evolution and suppression of H2 evolution. Notably, the highest photocatalytic activity (525.3 μmol h?1), selectivity toward CO evolution (85.2 %), and turnover number of CO to Ag (167) was achieved over 0.25 mol% (Ag@Cr)/Ga2O3. In addition to Ga2O3, the Ag@Cr cocatalyst modification strategy can also be applied to other photocatalyst materials such as NaTaO3, ZnGa2O4, and ZnGa2O4/Ga2O3 for the highly effective photocatalytic conversion of CO2 to CO when using H2O as an electron donor.
关键词： carbon dioxide,chromium hydroxide,Photocatalysis,core–shell structure,Ag cocatalyst
更新于2025-09-09 09:28:46
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Ultrathin Co0.85Se nanosheet cocatalyst for visible-light CO2 photoreduction
摘要： Ultrathin Co0.85Se nanosheets were prepared via a facile solvothermal method, which successfully overcome the disadvantage of insu?cient active sites in bulk Co0.85Se by reducing its thickness into the atomic scale. Co0.85Se nanosheets have been found to be e?cient cocatalysts for photocatalytic CO2 reduction with TON as high as 58 in 1 h reaction under visible-light irradiation. Compared with bulk Co0.85Se blocks, the ultrathin nanosheet samples exhibited nearly 2.5 times higher activity in CO2 photoreduction. The metal-like character and ultrathin 2D structure of Co0.85Se nanosheets support the superb charges transfer and rich CO2 adsorption sites exposure for surface catalysis. A relationship between the surface structure and the cocatalytic activity was established. These results not only demonstrate the potential of a notable, a?ordable and earth-abundant CO2 photoreduction cocatalyst based on ultrathin Co0.85Se nanosheets but also provide a guidance in the exploration of excellent active and durable cocatalysts/catalysts to replace noble metals for arti?cial photosynthesis.
关键词： Photocatalysis,Cocatalyst,Co0.85Se nanosheets,CO2 reduction
更新于2025-09-04 15:30:14