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PPECu/NiFe2O4 as an efficient visible-light-driven difunctional photocatalyst for degradation of PPCPs and hydrogen production
摘要： A simple coprecipitation method has been used to prepare PPECu/NiFe2O4 composites. The as-prepared samples were studied by XRD, FE-SEM, TEM, EDS and UVevis Drs. The loading of NiFe2O4 not only enhanced the visible light absorption intensity of composites, but also promoted the separation of photogenerated electron-hole pairs. Cocatalyst NiFe2O4 made the PPECu/NiFe2O4 composites possessed better activities for TC degradation and hydrogen production than pure PPECu. Among the composite photocatalysts, P-NFO-5 exhibited the highest activity with the degrade ef?ciency of 98% (20 min) and hydrogen evolution yield of 35.8 mmol/g (3.0 h) under visible light irradiation. Furthermore, a possible mechanism for the ef?cient PPECu/NiFe2O4 composite has been discussed.
关键词： NiFe2O4,Photodegradation,PPECu,Photocatalytic hydrogen production,Difunctional photocatalyst
更新于2025-09-04 15:30:14
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Potential Application of Metal–organic frameworks for Photocatalytic Water Splitting
摘要： These days, the environmental pollution and energy shortage are the crucial global issues. Therefore, replacing the renewable source of energy with the fossil fuels is the most promising approach to solve the aforementioned problems. Hydrogen is an attractive source energy because of its high energy density and its combustion by-product is only water. Hydrogen production through photosplitting of water over a semiconductor based photocatalyst is a desirable approach to diminish the global energy and environmental problems. However, its low solar conversion efficiency and finding suitable photocatalyst still remain as the main challenge for this system. Recently metal–organic frameworks (MOFs) have received great attention for the photocatalytic hydrogen production due to their large surface to volume ratio, design flexibility, and well-defined porosity. In this short review, we focus on the previous studies on the various types of MOFs based photocatalyst in the solar hydrogen production system. The main intention of review is to highlight the importance of coupling molecular approaches of catalyst design with materials science strategies in the improvement of MOFs based photocatalysts, which will undoubtedly lead to a very bright future for photocatalytic water.
关键词： Solar Energy,Photocatalytic Water Splitting,Metal–organic frameworks,Hydrogen Production,Renewable Energy
更新于2025-09-04 15:30:14
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Tetrathiafulvalene Scaffolds Based Sensitizer on Hierarchical Porous TiO <sub/>2</sub> : Efficient Light Harvesting Material for Hydrogen Production
摘要： In this work, a photochemical device that contains thioalkyl substituted tetrathiafulvalene dyes and hierarchical porous TiO2, has been designed and successfully employed in visible light-driven hydrogen production. The design strategy boost up the desirable photophysical properties of the catalysts and well supported from the optical, electrochemical and computational studies. The introduction of thioalkyl substituted tetrathiafulvalene dyes as light harvesting sensitizers onto the porous TiO2 triggers unprecedented high rate of hydrogen evolution. This study focuses on the role of thiafulvalene scaffold which can promote ultrafast interfacial electron injection from excited state dye into the hierarchical porous TiO2 conduction band. The purposeful construction of this integrated composite G3T3 (dye content 1.0 μmol in 10 mg Pt-TiO2 composite) significantly increases the hydrogen production rate of 24560 μmol.h-1g-1 cat with high apparent quantum yield (AQY) ~ 41%. In the study, both sensitizers absorption onset extends up to 500 nm in solution and 600 nm on hierarchical porous TiO2. Density functional theory (DFT) in the present study described that the HOMO levels are delocalized on anthracene as well as tetrathiafulvalene donor units, and LUMO covers on to the carboxylate anchoring group in both dyes. This study unveiled first time that a tetrathiafulvalene scaffolds in porous TiO2 attributes to positive synergistic effects in hydrogen production.
关键词： Tetrathiafulvalene,Hydrogen Production,Photocatalysis,Hierarchical Porous TiO2,Visible Light
更新于2025-09-04 15:30:14
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TiO2 Nanowires-Supported Sulfides Hybrid Photocatalysts for Durable Solar Hydrogen Production
摘要： As the feet of clay, photocorrosion induced by hole accumulation has placed serious limitations on the widespread deployment of sulfides nanostructures for photoelectrochemical (PEC) water splitting. Developing sufficiently stable electrodes to construct durable PEC systems is therefore the key to the realization of solar hydrogen production. Here, an innovative charge transfer manipulation concept based on the aligned hole transport across the interface has been realized to enhance the photostability of In2S3 electrodes toward PEC solar hydrogen production. The concept was realized by conducting compact deposition of In2S3 nanocrystals on the TiO2 nanowires array. Under PEC operation, the supporting TiO2 nanowires functioned as an anisotropic charge transfer backbone to arouse aligned charge transport across the TiO2/In2S3 interface. Because of the aligned hole transport, the TiO2 nanowires-supported In2S3 hybrid nanostructures (TiO2-In2S3) exhibited improved hole transfer dynamics at the TiO2/In2S3 interface and enhanced hole injection kinetics at the electrode surface, substantially increasing the long-term photostability toward solar hydrogen production. The PEC durability tests showed that TiO2-In2S3 electrodes can achieve nearly 90.9 % retention of initial photocurrent upon continuous irradiation for 6 h, whereas the pure In2S3 merely retained 20.8 % of initial photocurrent. This double-gain charge transfer manipulation concept is expected to convey a viable approach to the intelligent design of highly efficient and sufficiently stable sulfides photocatalysts for sustainable solar fuel generation.
关键词： In2S3,interfacial charge dynamics,CdS,photocorrosion,solar hydrogen production
更新于2025-09-04 15:30:14