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A Metal‐Organic‐Framework‐Derived g‐C3N4/α‐Fe2O3 Hybrid for Enhanced Visible‐Light‐Driven Photocatalytic
摘要： As one of the most efficient systems for photocatalytic hydrogen evolution, the Z-scheme system consisting of different semiconductors with a reversible donor-acceptor pair has attracted great attention. Considering for the nontoxicity and low cost of photocatalysts, a series of g-C3N4/α-Fe2O3 hybrids were rationally constructed based on the Z-scheme mechanism for the first time using a metal-organic framework template approach that can fine-tune the compositions and properties of the hybrids. An optimized hybrid, g-C3N4/α-Fe2O3-2, exhibited prominent photocatalytic water splitting performance with a visible light response. Under irradiation of visible light (λ > 420 nm), the hybrid shows a high durability and superior hydrogen production rate of 2066.2 μmol g-1 h-1 from water splitting, which is approximately three times greater than that of bulk g-C3N4 because of the effective separation of photo-excited charge carriers by two narrow bandgap semiconductors tightly coupled with the Z-scheme structural feature.
关键词： Z-scheme system,hydrogen evolution,g-C3N4/α-Fe2O3 hybrid,metal-organic frameworks
更新于2025-09-04 15:30:14
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Tailoring chemical and physical properties of graphene-added DNA hybrid thin films
摘要： While the characteristics of DNA and graphene are well studied, the chemical and physical properties of graphene-embedded DNA and cetyltrimethyl-ammonium chloride-modified DNA (CT-DNA) hybrid thin films (HTFs) have been rarely discussed due to the limited development of fabrication methodologies. Herein, we developed a simple drop-casting method for constructing DNA and CT-DNA HTFs added with graphene nanopowder (GNP). Additionally, we demonstrated their distinct characteristics, such as their structure, elemental composition, spin states and chemical functional groups, binding interactions, vibration/stretching modes, UV-Vis absorption, PL, and electrical properties. The EDS spectra of GNP-added DNA HTFs showed C, N, O, Na, and P peaks at characteristic energies. Because of the physical adsorption of GNP on DNA, the peak shifts and suppression of the core spectra of O 1s and P 2p were observed by XPS. The intensity variation of Raman and FTIR bands indicated hybrid formation of GNP in DNA and CT-DNA through adsorption, electrostatic interaction, and π–π stacking. UV-Vis absorption and PL spectra showed the considerable influence of GNP in DNA and CT-DNA HTFs. DNA and CT-DNA HTFs with relatively higher [GNP] showed significant increases of current due to the formation of interconnected networks of GNP in the DNA and CT-DNA HTFs.
关键词： spectroscopy,DNA,electrical property,hybrid thin film,graphene
更新于2025-09-04 15:30:14
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Potential, optimization and sensitivity analysis of photovoltaic-diesel-battery hybrid energy system for rural electrification in Algeria
摘要： Integration of hybrid renewable energy systems (HRES) as an electrification solution can enhance the rural electrification situation in Algeria's predominantly remote Saharan regions, where diesel generators are used to provide very basic and limited electricity service. The exploitation of such a solution requires a sustainable, optimized HRES design. This paper presents a methodology both to optimize and to perform a sensitivity analysis of an autonomous hybrid PV-diesel-battery energy system. Particle Swarm Optimization (PSO) and ε-constraint method were used to simultaneously minimize total system cost, unmet load, and CO2 emissions. One optimal solution was chosen among the solutions set and analyzed. The remote Saharan village of Tiberkatine, province of Tamanrasset in southern Algeria was considered as a case study. The hybrid system supplied the energy demand of 20 households. It was found that the optimal solution can supply energy without unmet load, the minimum cost of energy COE is 0.37 $/kWh with 93% renewable fraction. A sensitivity analysis was performed on the optimal system to study the impact of three parameters (load consumption, εCO2, and εLLP constraints) on the system behavior. Finally, a comparative analysis between PSO and HOMER was performed, it was found that the PSO based approach is more cost effective with more PV penetration than HOMER.
关键词： Photovoltaic,Diesel,PSO optimization,Rural electrification,Hybrid renewable energy system
更新于2025-09-04 15:30:14
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The Middle Road Less Taken: Electronic-Structure-Inspired Design of Hybrid Photocatalytic Platforms for Solar Fuel Generation
摘要： The development of efficient solar energy conversion to augment other renewable energy approaches is one of the grand challenges of our time. Water splitting, or the disproportionation of H2O into energy-dense fuels, H2 and O2, is undoubtedly a promising strategy. Solar water splitting involves the concerted transfer of four electrons and four protons, which requires the synergistic operation of solar light harvesting, charge separation, mass and charge transport, and redox catalysis processes. It is unlikely that individual materials can mediate the entire sequence of charge and mass transport as well as energy conversion processes necessary for photocatalytic water splitting. An alternative approach, emulating the functioning of photosynthetic systems, involves the utilization of hybrid systems wherein different components perform the various functions required for solar water splitting. The design of such hybrid systems requires the multiple components to operate in lockstep with optimal thermodynamic driving forces and interfacial charge transfer kinetics.
关键词： hybrid systems,water splitting,photocatalytic,charge transfer,solar energy conversion
更新于2025-09-04 15:30:14
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A Study on the Weak Ferromagnetism of Nanocrystalline Stannous Oxide Induced by L-Shaped O-Sn-O Vacancies
摘要： Nanocrystalline stannous oxide (SnO) powder has been prepared by ball-milling of micron-SnO in a nitrogen atmosphere. A cation deficiency of 6.5% was found in the nano-SnO sample by X-ray photoelectron spectroscopy. After annealing at 350, 450, or 550℃ under dynamic vacuum conditions, oxygen vacancies were found in the nano-SnO samples, as verified by electron paramagnetic resonance experiments. The samples displayed weak ferromagnetism; that with both 6.5% Sn and at least 7.5% O vacancies showed the maximum saturation magnetization, reaching almost 1.7×10?3 emu/g at room temperature. The O vacancies tended to gather around Sn vacancies. An L-shaped defect model composed of one Sn and two O vacancies has been established, and its ferromagnetism has been calculated by a first-principles method. We found that the L-shaped defect induced a magnetic moment of 0.55 μB in the SnO lattice, the main contribution to which came from a spin-polarized electron in the p orbital of a corner Sn atom.
关键词： Magnetic,Nanocrystalline Stannous Oxide,Plasmonics,L-Shaped O-Sn-O Vacancies,Weak Ferromagnetism,Optical,Hybrid Materials
更新于2025-09-04 15:30:14
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All-Optical Poling and Two-Photon Absorption in Heterocyclic Azo Dyes with Different Side Groups
摘要： We investigated the optical properties of heterocyclic azo dyes with different side groups prepared: as powders, in PMMA matrix and side-chain polymers. We characterized the nonlinear optical effects of these compounds by Z-scan and all-optical poling techniques and supported these experiments with theoretical modeling. It was also found that these materials show strong two-photon absorption cross-sections exceeding 20 GM, which is one order of magnitude stronger than that of similar materials (azobenzene and p-aminoazobenzene). Our study reveals the dominant role of the side-chain system over the guest-host one and stress out the importance of the substituent in the efficiency of the poling process.
关键词： All-Optical Poling,Hybrid Materials,Heterocyclic Azo Dyes,Two-Photon Absorption,Plasmonics,Optical,Magnetic
更新于2025-09-04 15:30:14
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Nanoapertures without nanolithography
摘要： We propose and experimentally demonstrate the implementation of lithography-free nano-apertures on optical fibers. By sputtering metallic nanofilms onto the end face of step index fibers that contain central nano-channels, fiber-integrated nano-apertures are instantaneously implemented without the use of any kind of lithographic step. In accordance with simulations, the experiments show diffraction-limited nano-spots in the far-field at the location of the nano-aperture for sufficiently thick films. We reproducibly implement a series of devices by sputtering Al and Pt nano-films, reaching aperture diameters as small as 40 nm and showing spectrally broadband operation. Due to its simplicity, scalability and potential for large-scale production the nano-aperture enhanced fiber concept will be highly relevant for lab-on-a-fiber applications and for the development of future fiber-based nano-probes with high spatial resolutions.
关键词： lab-on-a-fiber,hybrid fibers,nanofabrication,scanning near-field optical microscopy (SNOM),nanoapertures
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - A High-Performance Cost-Effective Resonant Converter with a Wide Input Range in Solar Power Applications
摘要： In this paper, a novel hybrid-resonant PWM switching scheme is presented for an isolated high-performance and cost-effective LLC multi-resonant dc-dc converter with an output voltage-doubler in solar power applications. The new hybrid-resonant PWM switching scheme enables a resonant converter topology to achieve very high energy efficiency over a wide range of input line and load. The proposed control scheme not only maximized the efficiency, but also simplifies the implementation of MPPT in resonant converters. Finally, using SiC wide-band gap semiconductor technology will make it possible to operate these devices and the electronic board in an elevated temperate, thus achieving higher reliability and required life time. Experimental results are presented for a prototype unit converting input voltage range of 17 V to 48 V dc from a solar panel to an output voltage of 400 V dc at 250 W. The prototype achieves a peak efficiency of 98.5 %.
关键词： hybrid-resonant PWM switching,PWM switching,MPPT,resonant converter,solar power
更新于2025-09-04 15:30:14
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Superresolution mapping based on hybrid interpolation by parallel paths
摘要： Superresolution mapping (SRM) is a technology to handle mixed pixels in remote sensing image. In this letter, a novel hybrid interpolation-based SRM by parallel paths (HISRM-PP) is proposed. Firstly, the two di?erent high resolution fractional images for each class are respectively derived by parallel paths. Then the two kinds of high resolution fractional images are integrated to produce the higher resolution fractional images by the appropriate weighting images are parameter. Finally, the higher resolution fractional utilized to obtain SRM result by class allocation. Due to the parallel paths in HISRM-PP, the more spatial-spectral information of the original image is utilized to improve the accuracy of SRM result. Experimental results on the two real remote sensing data show that HISRM-PP produces the better SRM result than the existing hybrid interpolation-based SRM (HISRM).
关键词： Superresolution mapping,parallel paths,remote sensing,hybrid interpolation
更新于2025-09-04 15:30:14
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Faraday Filtering on the Cs-D <sub/>1</sub> -Line for Quantum Hybrid Systems
摘要： Narrow-band ?ltering of light is widely used in optical spectroscopy. Atomic ?lters, which rely on the Faraday effect, allow for GHz-wide transmission spectra, which are intrinsically matched to an atomic transition. We present an experimental realization and a theoretical study of a Faraday ?lter based on cesium and its D1-line-transition (62 S1/2 → 62 P1/2) around 894 nm. We also present the prospects and visions for combining this ?lter with the single photon emission of a single quantum dot, which matches with the atomic transition. The option to lock the spectral position of a quantum dot is discussed at the end of this letter.
关键词： Faraday ?lter,Atomic ?lter,quantum hybrid devices,quantum dots
更新于2025-09-04 15:30:14