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Efficient photoanode with a MoS₂/TiO₂/Au nanoparticle heterostructure for ultraviolet-visible photoelectrocatalysis

Nanotechnology 2024年第38期35卷 385703-385703页

作者： Mai, The-Hung Do, Huy-Binh Pham, Long Duy Phan, Thien Xuan Chen, Wei-Zhi Lan, Liang-Wei Lin, Hung-Ju Nguyen, Van-Hung Dong, Chung-Li Kumar, Alagarsamy S K El-Mahdy, Ahmed F M Lee, Hyeonseok Dang, Dinh Khoi Vo, Dai-Viet N Tu, Li-Wei Kuo, Chien-Cheng Yang, Hung-Duen Pham, Phuong V Department of Physics National Sun Yat-sen University Faculty of Applied Science Ho Chi Minh University of Technology and Education Institute of Material Science Vietnam Academy of Science and Technology Institute of Physics Vietnam Academy of Science and Technology International Training Institute for Material Science Hanoi University of Science and Technology Department of Physics Tamkang University Department of Chemistry National Sun Yat-sen University Faculty of Geology Geophysics and Environmental Protection Akademia Gorniczo-Hutnicza (AGH) University of Science and Technology Department of Materials and Optoelectronic Science National Sun Yat-sen University Department of Photonics National Sun Yat-sen University Faculty of Chemical and Food Technology Ho Chi Minh City University of Technology and Education Institute of Applied Technology and Sustainable Development Nguyen Tat Thanh University

Green energy technology is generally becoming one of hot issues that need to be solved due to the adverse effects on the environment of fossil fuels. One of the strategies being studied and developed by theorists and experimentalists is the use of photoelectrochemical (PEC) cells, which are emerging as a candidate to produce hydrogen from water splitting. However, creating photoelectrodes that meet the requirements for PEC water splitting has emerged as the primary obstacle in bringing this technology to commercial fruition. Here, we construct a heterostructure, which consists of MoS₂/TiO₂/Au nanoparticles (NPs) to overcome the drawbacks of the photoanode. Owing to the dependence on charge transfer, the bandgap of MoS₂/TiO₂ and the utilization the Au NPs as a stimulant for charges separation of TiO₂ by localized surface plasmon resonances effect as well as the increase of hot electron injection to cathode, leading to photocatalytic activities are improved. The results have recorded a significant increase in the photocurrent density from 2.3 μ A c m − 2 of TiO₂ to approximately 16.3 μ A c m − 2 of MoS₂/TiO₂/Au NPs. This work unveils a promising route to enhance the visible light adsorption and charge transfer in photo-electrode of the PEC cells by combining two-dimensional materials with metal NPs. © 2024 The Author(s). Published by IOP Publishing Ltd.

关键词： efficiency heterostructure photocatalytic plasmonic nanoparticles visible

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Attitude Dynamics Modelling: Fractional Consensus Approach

Attitude Dynamics Modelling: Fractional Consensus Approach

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IEEE Conference on Decision and Control

作者： Jerzy Baranowski Waldemar Bauer Karolina Dukała Dorota Mozyrska Małgorzata Wyrwas Department of Automatic Control and Robotics AGH University of Science & Technology Kraków Poland SWPS University of Social Sciences and Humanities Katowice Poland Faculty of Computer Science Bialystok University of Technology Bialystok Poland

In this paper we propose a consensus model using fractional calculus, which is an emerging topic in multi-agent modeling. Fractional models have infinite memory and can be understood as a relatively simple extension of traditional calculus. We propose a model structure motivating it by psychological research. For such model we also provide a stability analysis allowing results on possibilities of consensus arising in the modelled group of agents. To achieve this, we use fractional difference equations, which illustrate our considerations for agent groups of increasing complexity.

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Effect of Mg Deficiency on the Thermoelectric Properties of Mg2(Si, Sn) Solid Solutions

SSRN

引用

SSRN 2023年

作者： Byeon, Seokyeong Wiendlocha, Bartlomiej de Boor, Johannes Nielsch, Kornelius Jin, Hyungyu Korea Republic of AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland KölnD-51147 Germany Leibniz Institute for Solid State and Materials Science Dresden01069 Germany Institute of Materials Science TU Dresden Dresden01062 Germany Institute of Applied Physics TU Dresden Dresden01062 Germany

Here we report a detailed analysis of the change in the thermoelectric properties of a Mg x (Si, Sn) system under variation of the nominal Mg content x (x = 1.8, 1.9, 2.1, 2.2, 2.3). Additional investigations were carried out to elucidate the mechanism by which Mg-deficient conditions induce point defects such as Mg vacancies and anion anti-site defects, and how these defects govern the thermoelectric properties of a Mg x (Si, Sn) system. We find that unmixing was induced by Mg deficiency, allowing the thermoelectric transport properties of the Mg x (Si, Sn) system to support the band gap reduction of the system. Temperature dependent measurement of the Seebeck coefficient and the Hall coefficient show that Mg-deficiency induces p-type behavior;this is further backed up by an analysis of the transport properties using a single parabolic band (SPB) model at low temperature and a simple two band model at high temperatures. The p-type conduction in the Mg-deficient system suggested that the predominant defects were Mg vacancies. However, the efficiency of p-type doping was much lower (~ 1018 cm-3) than expected when considering only Mg vacancies as origin of charge carriers. . Density functional theory (DFT) calculations suggest the anion anti-site defect on the Mg site as a reason for the low measured carrier concentration and low doping efficiency. Moreover, it is shown that the energy band structure of the Mg deficient Mgx(Si, Sn) system undergoes significant deformation and the formation of an impurity band at the X point as a result of the Mg-deficient conditions, allowing the system to have a relatively anion-rich condition. Furthermore, the Mg deficiency minimize the thermal conductivity with a range of 1 ~ 1.5 W/m∙K at room temperature due to an early bipolar contribution and separated structural phases. The presented study provides a new control parameter that can be utilized to enhance the p-type thermoelectric performance of Mg silicides. © 2023, The Authors

关键词： Phase separation

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Effect of symmetry breaking of polarized light sea quarks on the nucleon and nuclear structure functions, and sum rules

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Physical Review C 2023年第3期108卷 035203-035203页

作者： Fatemeh Arbabifar Shahin Atashbar Tehrani Hamzeh Khanpour Department of Physics Education Farhangian University P.O. Box 14665-889 Tehran Iran School of Particles and Accelerators Institute for Research in Fundamental Sciences (IPM) P.O. Box 19395-5531 Tehran Iran AGH University of Science and Technology Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 30-055 Krakow Poland Department of Physics University of Science and Technology of Mazandaran P.O. Box 48518-78195 Behshahr Iran

In this study, we performed calculations and analyses of the structure functions of polarized nucleons and light nuclei, specifically He3 and H3, using second-order Feynman diagrams. Our investigation focused on two main aspects: First, we examined the symmetry properties of polarized light sea quarks. Second, we conducted a detailed investigation into the impacts of symmetry breaking on the structure functions of both nucleons and nuclei. To achieve this, we utilized the existing polarized parton distribution functions (polarized PDFs) available in the literature. These PDFs were used to calculate and compare the polarized structure functions g1 and g2 of the nuclei. Additionally, we examined and analyzed the Bjorken and Efremov-Leader-Teryaev sum rules by utilizing the moments of the polarized structure functions. The Lorentz color force components, namely FEy,n and FBy,n, were determined using the twist-2, twist-3, and twist-4 matrix elements. When symmetry breaking is applied, it is observed that they have similar magnitudes but opposite signs. Our theoretical predictions for the polarized structure functions of nucleons and light nuclei, taking into account the symmetry breaking of light sea quarks, exhibit better agreement with experimental data.

关键词： Deep inelastic scattering Perturbative QCD Polarization phenomena QCD in nuclear reactions A ≤ 5

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Thermal simulation of microwave kiln based on multiphysics

Thermal simulation of microwave kiln based on multiphysics

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2023 International Technical Conference on Circuits/Systems, computers, and Communications, ITC-CSCC 2023

作者： Jansaengsuk, Thodsaphon Pattanapichai, Sorathon Poopanya, Piyawong Phimphakan, Nonthawat Thongsri, Jatuporn College of Advanced Manufacturing Innovation King Mongkut's Institute of Technology Ladkrabang Computer Simulation in Engineering Research Group Bangkok10520 Thailand Ubon Ratchathani Rajabhat University Program of Physics Faculty of Science Ubonratchatani34000 Thailand

ISBN: (纸本)9798350326413

A microwave kiln, made of silicon carbide and ceramic fiber, commonly employs in a household glassware production process. In this process, when the kiln was in a microwave oven, a microwave transmitted to the kiln generating a high temperature to fuse the glass inside. This article presents a thermal simulation to investigate the temperature inside the kiln based on multiphysics consisting of a high-frequency structure simulator (HFSS) and computational fluid dynamics (CFD). The multiphysics results revealed the temperature inside the kiln in a transient state, consistent with the experimental results. As expected, the temperature increased with the increasing time of the process. Significantly, the silicon carbide had higher temperatures than the ceramic fiber;therefore, silicon carbide is a crucial material for generating heat inside the kiln. In addition, the temperature-increasing rate (TIR) inside the kiln depended on the kiln's thickness (Th). As a result, the thinner Th provided better TIR. The research findings can be applied to develop a high-efficacy household glassware production process. © 2023 IEEE.

关键词： Multiphysics

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Scaled tight binding model for a two dimensional electron gas at the (001) LaAlO3/SrTiO3 interface

arXiv

引用

arXiv 2024年

作者： Wójcik, Pawel Citro, Roberta Szafran, Bartlomiej AGH University of Krakow Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland Physics Department E. R. Caianiello' and CNR-SPIN Università degli Studi di Salerno SA Fisciano Italy

The progress in the fabrication of nanoscale systems based on the two-dimensional electron gas at the interface between LaAlO3 and SrTiO3 (LAO/STO) has created an increased demand for simulations of these nanostructures, which typically range in size from tens to hundreds of nanometers. Due to the low lattice constant of LAO/STO, approximately 0.394 nm, these calculations become extremely time-consuming. Here, we present a scaled tight-binding approximation defined on a mesh with size that can be several times larger than in the ordinary approach. The scaled model is analyzed within the context of quantum transport simulations and electronic structure calculations. Our findings demonstrate that the scaled model closely aligns with the ordinary one up to a scaling factor of 8. These results pave the way for more efficient simulations of LAO/STO nanostructures with realistic sizes relevant to experimental applications. © 2024, CC BY.

关键词： Electron gas

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A global study of -clusters decay in heavy and superheavy nuclei with half-life and preformation factor

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The European Physical Journal A 2024年第3期60卷 1-14页

作者： Saxena, G. Sharma, P. K. Saxena, Prafulla Department of Physics (H & S) Government Women Engineering College Ajmer India Department of Physics Faculty of Science University of Zagreb Zagreb Croatia Government Polytechnic College Rajsamand India Department of Computer Science and Engineering Malviya National Institute of Technology Jaipur India

A detailed study of $$\alpha $$ -clusters decay is exhibited by incorporating crucial microscopic nuclear structure information into the estimations of half-life and preformation factor. For the first time, using the k-cross validation approach, two semi-empirical formulas for (1) $$\alpha $$ -decay half-life and (2) $$\alpha $$ -particle preformation factor, are picked out and subsequently modified by including shell, odd-nucleon blocking, and asymmetry effects along with the usual dependence on $$\alpha $$ -decay energy ( $$Q_{\alpha }$$ ) and angular momentum of $$\alpha $$ -particle. Both the formulas are fitted for the two different regions separated by neutron number N $$=$$ 126, as from the experimental systematics the role of N $$=$$ 126 shell closure is found decisive in determining the trends of $$Q_{\alpha }$$ , $$\alpha $$ -decay half-life, and $$\alpha $$ -particle preformation factor. It is found that the inclusion of the above-mentioned degrees of freedom significantly reduces the errors in the estimations when compared with several other similar modified/refitted semi-empirical relations indicating the robustness of the proposed formulas. The predictions of $$\alpha $$ -decay half-life throughout the periodic chart have been made including the unknown territory, future probable decay chain of self-conjugate nucleus $$^{112}$$ Ba terminated on $$^{100}$$ Sn, decay chain of $$^{208}$$ Pa through new isotope $$^{204}$$ Ac as well as decay chains of awaiting superheavy nuclei $$^{298}$$ Og and $$^{299}$$ 120. This article is expected to provide a systematic approach to selecting the formula by which reliable predictions can be made.

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On Voronoi visibility maps of 1.5D terrains with multiple viewpoints

arXiv

引用

arXiv 2023年

作者： Keikha, Vahideh Saumell, Maria The Czech Academy of Sciences Institute of Computer Science Czech Republic Faculty of Mathematics and Physics Department of Applied Mathematics Charles University Prague Czech Republic Department of Theoretical Computer Science Faculty of Information Technology Czech Technical University Prague Czech Republic

Given an n-vertex 1.5D terrain T and a set P of m 2 + kc) log n) time, where kc and kv denote the total complexity of ColVis(T, P) and VorVis(T, P), respectively. This improves upon a previous algorithm for this problem. We also generalize our algorithm to higher order Voronoi visibility maps, and to Voronoi visibility maps with respect to other distances. Finally, we prove bounds relating kv to kc, and we show an application of our algorithm to a problem on limited range of sight. © 2023, CC BY.

关键词： Visibility

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Approximate method for helical particle trajectory reconstruction in high energy physics experiments

arXiv

引用

arXiv 2022年

作者： Topolnicki, Kacper Bold, T. M. Smoluchowski Institute of Physics Jagiellonian University Kraków30-348 Poland Agh University of Science and Technology Dept. of Physics and Applied Computer Science Krakow Poland

High energy physics experiments, in particular experiments at the LHC, require the reconstruction of charged particle trajectories. Methods of reconstructing such trajectories have been known for decades, yet the applications at High Luminosity LHC require this reconstruction to be fast enough to be suitable for online event filtering. A particle traversing the detector volume leaves signals in active detector elements from which the trajectory is reconstructed. If the detector is submerged in a uniform magnetic field that trajectory is approximately helical. Since a collision event results in the production of many particles, especially at high luminosities, the first phase of trajectory reconstruction is the formation of candidate trajectories composed of a small subset of detector measurements that are then subject of resource intensive precise track parameters estimation. In this paper, we suggest a new approach that could be used to perform this classification. The proposed procedure utilizes the z coordinate in the longitudinal direction in addition to the x, y coordinates in the plane perpendicular to the direction of the magnetic field. The suggested algorithm works equally well for helical trajectories with different proximities to the beamline which is beneficial when searching for products of particles with longer lifetimes. Copyright © 2022, The Authors. All rights reserved.

关键词： Luminance

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Out-Of-Equilibrium Electron Energy Loss Spectroscopy

Out-Of-Equilibrium Electron Energy Loss Spectroscopy

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Ruimy, Ron Lamprecht, Itay Karnieli, Aviv Sloan, Jamison Kaminer, Ido Faculty of Electrical and Computer Engineering Technion Israel Institute of Technology Haifa32000 Israel Raymond and Beverly Sackler School of Physics and Astronomy TelAviv University Ramat Aviv Tel Aviv69978 Israel Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States

We develop the general formalism that describes the inelastic scattering of free electrons by out-of-equilibrium materials. Utilizing modulated electrons further reveals previously inaccessible information and enables... 详细信息

ISBN: (纸本)9781957171258

关键词： Inelastic scattering

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