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Enhanced solar induced photo-thermal synergistic catalytic CO2 conversion by photothermal material decorated TiO2
摘要： Semiconductor material with narrow bandgap is an ideal photo-thermal conversion material because of its high absorption intensity in infrared region. Here, CuS/TiO2 composites were synthesized based on UV-responsive TiO2 compound with narrow bandgap semiconductor material CuS for CO2 conversion under full-spectrum irradiation. The experimental results showed that 2% CuS/TiO2 exhibited higher photocatalytic CO2 reduction efficiency due to the solar induced photo-thermal synergistic effect. CuS can absorb and convert infrared light into heat energy, which promotes the utilization range of sunlight for CO2 conversion. In-situ Fourier transform infrared spectroscopy (FT–IR) was used to explain the photocatalytic mechanism at the molecular level. This work suggested a feasible way for integrated utilization of solar energy by narrow bandgap semiconductor compounds with TiO2 to convert CO2.
关键词： TiO2,photocatalysis,solar,CuS,CO2 conversion
更新于2025-09-23 15:23:52
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Preparation of Pd/TiO2 nanowires for the photoreduction of CO2 into renewable hydrocarbon fuels
摘要： In this study, various Pd-loaded TiO2 nanowire (Pd/TiO2–NW) catalysts were prepared using the hydrothermal method, and their photocatalytic activity toward the photoreduction of CO2 into methane (CH4) and carbon monoxide (CO) was evaluated. The photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy, transmission electron microscopy, UV–vis spectroscopy, X-ray photoelectron spectroscopy and photoluminescence analysis. The addition of Pd on TiO2–NWs can improve the production yield of CO2 photoreduction to CH4 and CO. The 0.5 wt% Pd/TiO2–NWs showed optimal CO and CH4 yields of 50.4 and 26.7 μmol/g, respectively. Moreover, the 0.5 wt% Pd/TiO2–NWs could be used repeatedly with only a small loss of photocatalytic activity noted after 30 days. Furthermore, a mechanism for the photoreduction of CO2 was proposed. Therefore, Pd/TiO2–NWs are an efficient photocatalyst for the reduction of CO2 to CH4 and CO.
关键词： Renewable hydrocarbon fuels,CO2 conversion,Photocatalyst,Pd-loaded TiO2 nanowires
更新于2025-09-23 15:23:52
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Sustainable Recovery of CO2 by Using Visible-Light-Responsive Crystal Cuprous Oxide/Reduced Graphene Oxide
摘要： A simple solution-chemistry method has been investigated to prepare crystal cuprous oxide (Cu2O) incorporated with reduced graphene oxide (designated as Cu2O-rGO-x, where x represents the contents of rGO = 1%, 5% and 10%) in this work. These Cu2O-rGO-x composites combine the prospective advantages of rhombic dodecahedra Cu2O together with rGO nanosheets which have been studied as visible-light-sensitive catalysts for the photocatalytic production of methanol from CO2. Among the Cu2O-rGO-x photocatalysts, the methanol yield photocatalyzed by Cu2O-rGO-5% can be observed to be 355.26 μmol g?1cat, which is ca. 36 times higher than that of pristine Cu2O nanocrystal in the 20th hour under visible light irradiation. The improved activity may be attributed to the enhanced absorption ability of visible light, the superior separation of electron–hole pairs, well-dispersed Cu2O nanocrystals and the increased photostability of Cu2O, which are evidenced by employing UV-vis diffuse reflection spectroscopy, photoluminescence, scanning electron microscopy/transmission electron microscopy and X-ray photoelectron spectroscopy, respectively. This work demonstrates an easy and cost-effective route to prepare non-noble photocatalysts for efficient CO2 recovery in artificial photosynthesis.
关键词： cuprous oxide,solar energy,visible-light-driven,graphene,CO2 conversion
更新于2025-09-23 15:22:29
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3D Yolk@Shell TiO2-x/LDH Architecture: Tailored Structure for Visible Light CO2 Conversion
摘要： CO2 photo-conversion into hydrocarbon solar fuels by engineered semiconductors is considered as a feasible plan to address global energy requirements in times of global warming. In this regard, three dimensional yolk@shell hydrogenated TiO2/Co-Al layered double hydroxide (3D Y@S TiO2-x/LDH) architecture was successfully assembled by sequential solvothermal, hydrogen treatment and hydrothermal preparation steps. This architecture revealed a high efficiency for the photo-reduction of CO2 to solar fuels, without a noble metal co-catalyst. The time dependent experiment indicated that the production of CH3OH was almost selective until 2h (up to 251 μmol/gcat. h.), whereas the CH4 was produced gradually by increasing the time of reaction to 12h (up to 63 μmol/gcat. h.). This significant efficiency can be ascribed to the engineering of 3D Y@S TiO2-x/LDH architecture with considerable CO2 sorption ability in mesoporous yolk@shell structure, and LDH interlayer spaces. Also, oxygen vacancies in TiO2-x could provide excess sites for sorption, activation and conversion of CO2. Furthermore, the generated Ti3+ ions in the Y@S TiO2 structure as well as connecting of structure with LDH plates, can facilitate the charge separation and decrease the band gap of nanoarchitecture to the visible region.
关键词： Solar fuel,Oxygen vacancy,Photocatalysis,CO2 conversion,Nanoarchitectures
更新于2025-09-23 15:22:29
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Persian buttercup-like BiOBrxCl1-x Solid Solution for Photocatalytic overall CO2 Reduction to CO and O2
摘要： The photocatalytic overall conversion of CO2 with H2O to chemical fuel and oxygen mimicking natural photosynthesis is a huge challenge in photocatalysis. This work shows the achievement of the solar-driven photocatalytic overall CO2 reduction with H2O to CO and O2 over a Persian buttercup-like BiOBrxCl1-x solid solution. A CO generation rate of 15.86 μmol g?1 h?1 with the approximate stoichiometric O2 evolution is yielded on BiOBr0.6Cl0.4 solid solution under simulated solar light irradiation, which was about 7.5 and 10.2 times higher than that of pure BiOCl (2.11 μmol g?1 h?1) and BiOBr (1.55 μmol g?1 h?1), respectively. The enhanced photoactivity is contributed to the mediate band gap and energy level tuned by the formation of BiOBrxCl1-x solid solution to facilitate the separation of photogenerated charges. Besides the unique electron structure, the photoinduced oxygen vacancy (OV) formed on BiOBrxCl1-x solid solution also plays an important role in the CO2 reduction.
关键词： CO2 conversion,BiOBrxCl1-x,Solid solution,Photocatalysis
更新于2025-09-23 15:21:21
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Visible Light CO2 Reduction to CH4 Using Hierarchical Yolk@shell TiO2-xHx Modified with Plasmonic Au-Pd Nanoparticles
摘要： Engineering of advanced semiconductor photocatalysts for CO2 conversion to solar fuels is a promising strategy to solve the greenhouse effect and energy crisis. Herein, hierarchical urchin-like yolk@shell TiO2-xHx decorated with core/shell Au-Pd plasmonic nanoparticles (HUY@S-TOH/AuPd) have been prepared using a multi-step process and employed as advanced visible light active photocatalyst in CO2 conversion to CH4 with rate of 47 μmol/gcat.h (up to 126 μmol/gcat after 7h). Different engineered sites in this structure for high gas adsorption, powerful visible light activation and intense electron transportation are responsible for the observed high photocatalytic CO2 conversion efficiency. The present smart designing process can produce a considerable cooperation, not only to disclose the architectural engineering to improvement of photo-conversion efficiency, but also as a viable and appropriate photocatalytic process to sustainable energy production.
关键词： nanoarchitecture,Plasmonic nanoparticles,Photocatalysis,CO2 Conversion,Oxygen vacancy
更新于2025-09-23 15:19:57
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Ultrathin Bi4O5Br2 nanosheets for selective photocatalytic CO2 conversion into CO
摘要： The ultrathin two-dimensional materials with the unique catalytic performance attract extensive interests of researchers. In this paper, ultrathin Bi4O5Br2 nanosheet (Bi4O5Br2-UN) is synthesized through precursor method by controlling the mole ratio of Bi(NO3)3·5H2O and cetyltrimethyl ammonium bromide. The ultrathin structure of Bi4O5Br2-UN was con?rmed by X-ray di?raction, atomic force miscroscopy and high-resolution transmission electron microscopy. UV–vis light irradiation, Bi4O5Br2-UN display excellent selective photocatalytic activity for CO2 conversion, which also was proved by isotope experiment. After 2 h reaction, the CO generation over Bi4O5Br2-UN reached 63.13 μmol g?1, which is about 2.3 times higher than that of bulk Bi4O5Br2 (27.56 μmol g?1). Additionally, the CO selectivity of Bi4O5Br2-UN is more than 99.5% in the whole catalytic process. The enhanced CO2 adsorption, suitable band position and improved charge separation induce the outstanding photocatalytic performance of Bi4O5Br2-UN. The photocatalytic mechanism of CO2 conversion with Bi4O5Br2-UN was analyzed by the in situ Fourier transform infrared spectrometry (FT-IR).
关键词： Bi4O5Br2,CO2 conversion,Photocatalysis,Selectivity,Ultrathin
更新于2025-09-09 09:28:46
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A specifically-exposed cobalt oxide/carbon nitride 2D heterostructure for carbon dioxide photoreduction
摘要： Photocatalytic reduction of CO2 provides an opportunity to reach carbon neutrality, by which CO2 emissions from fuel consumption can be converted back to fuels. The challenge is to explore materials with high charge separation efficiency and effective CO2 adsorption capacity to boost the photoreduction of CO2. Here we report that 2D heterostructure comprised of Co3O4/2D g-C3N4 (COCN) can provide enhanced photocatalytic performance of reducing CO2 to CO, yielding a CO production rate of 419 μmol g-1 h-1 with selectivity of 89.4%, which is 13.5 and 2.6 times higher than that of pure 2D g-C3N4 and Co3O4. The enhanced photocatalytic performance arises from: (i) enhanced light absorption ability and charge separation efficiency originated from the unique 2D heterostructure connected through specifically-exposed facet interface and (ii) favorable CO2 adsorption capacity. The study may provide insight for the establishment of heterostructure-based photocatalytic system toward CO2 reduction.
关键词： g-C3N4,Co3O4,Composite photocatalysts,CO2 conversion
更新于2025-09-04 15:30:14