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Radiation Effects of 500 MeV Kr+ ions on NiO/β-Ga2O3 heterojunction diodes

IEEE Transactions on Nuclear Science 2025年

作者： Zhao, Penghui Chen, Hao Zhou, Leidang Ma, Teng Chen, Liang Yang, Tao Lei, Zhifeng Lu, Xing Zhou, Genshu Guo, Hui Ouyang, Xiaoping School of Materials Science and Engineering Xi’an Jiaotong University Xi’an710049 China Xi’an Jiaotong University School of Microelectronics Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Xi’an Engineering Research Center of Advanced3D Vision Shaanxi Xi’an710000 China China Electronic Product Reliability and Environmental Testing Research Institute Science and Technology on Reliability Physics and Application of Electronic Component Laboratory Guangzhou510610 China Northwest Institute of Nuclear Technology Radiation Detection Research Center Xi’an710024 China Xi’an Jiaotong University School of Instrument Science and Technology Xi’an710049 China Sun Yat-sen University State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Guangzhou510275 China Xidian University School of Microelectronics Shaanxi Xi’an710016 China

This study investigates the in-situ radiation effects on NiO/β-Ga2O3 heterojunction diodes (HJDs) under 500 MeV Kr+ ions irradiation, with a fluence of 1×108 cm-2 at -200 V. The statistical results show that both the forward conductive and reverse blocking characteristics of the HJDs were degraded after the irradiation of Kr+ ions. Associated with the analysis of current-voltage characteristics and the SRIM simulation results, the performance degradations were attributed to the vacancies induced by Kr+ ions radiation in the β-Ga2O3 material. On the one hand, the Kr+ radiation-induced vacancies reduced the net carrier concentration of the β-Ga2O3 and increased the generation-recombination current, leading to increased specific on-resistance and ideality factor of the irradiated HJDs. On the other hand, an oxygen di-vacancies-related trap, set at 1.07±0.01 eV below the conduction band, was involved after Kr+ ions radiation, which enhanced the Poole-Frenkel emission process, dominating the higher leakage current of the irradiated HJDs beyond -300 V. These results provide valuable insights into the radiation damage and performance degradation mechanisms in β-Ga2O3-based devices for space applications. © 1963-2012 IEEE.

关键词： Radiation damage

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An efficient cellular flow model for cohesive particle flocculation in turbulence

arXiv

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arXiv 2020年

作者： Zhao, K. Vowinckel, Bernhard Hsu, T.-J. Köllner, T. Bai, B. Meiburg, E. Department of Mechanical Engineering UC Santa Barbara CA93106 United States State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Leichtweiß-Institut für Wasserbau Technische Universität Braunschweig Braunschweig38106 Germany Center for Applied Coastal Research Department of Civil & Environmental Engineering University of Delaware NewarkDE19716 United States

We propose a one-way coupled model that tracks individual primary particles in a conceptually simple cellular flow setup to predict flocculation in turbulence. This computationally efficient model accounts for Stokes drag, lubrication, cohesive and direct contact forces on the primary spherical particles, and allows for a systematic simulation campaign that yields the transient mean floc size as a function of the governing dimensionless parameters. The simulations reproduce the growth of the cohesive flocs with time, and the emergence of a log-normal equilibrium distribution governed by the balance of aggregation and breakage. Flocculation proceeds most rapidly when the Stokes number of the primary particles is O(1). Results from this simple computational model are consistent with experimental observations, thus allowing us to propose a new analytical flocculation model that yields improved agreement with experimental data, especially during the transient stages. Copyright © 2020, The Authors. All rights reserved.

关键词： Turbulence

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Study on Combustion Characteristics of Coals in High Temperature Water Vapor Atmospheres

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2018年第12期52卷 84-92页

作者： Yao, Yashu Wen, Du Zhou, Qulan Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

A scheme of adding high temperature water vapor to the combustion system to achieve low-nitrogen combustion is proposed to reduce NOx production during coal combustion, and its thermodynamic calculation and experimental research are carried out. Firstly, the possibility and limitation of the reactions in the volatile combustion process of coal after adding high temperature water vapor are examined by theoretical calculation based on the standard molar reaction Gibbs free energy change, the standard molar enthalpy and the equilibrium constant. Results of reaction path speculation show that in the high temperature water vapor atmosphere, the reactions of converting N element to N2 occur in the temperature range of coal combustion. Secondly, in reactions with various excess air coefficients, the equilibrium components after adding different concentrations of high temperature water vapor are calculated using the software HSC Chemistry. Results of the thermodynamic calculation show that the reaction of NOx precursor to N2 happens in a wide temperature range: when the temperature ranges from 700 to 800 and excess air coefficient lies between 0.6 and 0.8, the formation of NOx significantly reduces by adding high temperature water vapor;Reduction rate of NOx increases with the concentration of high temperature water vapor increasing. Eventually, the combustion characteristics of pulverized coal in water vapor and air atmosphere are tested in a pulverized coal fixed bed combustion experiment system. It shows that the formation of NOx is inhibited by adding high temperature water vapor and the effect is better that the result of the thermodynamic calculation, and the NOx reduction rate has a nonlinear relation with the water vapor concentration and the temperature. This study may provide an economical and efficient reference solution to low NOx combustion of coal. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

关键词： Coal combustion

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Mass Transfer and Kinetics of CO2 Absorption in Aqueous MDEA/DMSO Solutions

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第8期39卷 1763-1768页

作者： Luo, Qin-Lan Fang, Bin Qiang, Lei Li, Na Zhou, Qu-Lan State key laboratory of multiphase flow in power engineering Xi'an Jiaotong University Xi'an710049 China

In this study, the CO2 absorption rates in aqueous MDEA/DMSO solutions at various temperatures of 293.15 K, 303.15 K, 313.15 K and 323.15 K and concentrations varied from 0.5 mol/L to 6.6 mol/K were measured by using a laboratory wetted-wall column reactor with an immobile gas-liquid interface. A simplified kinetic model of gas-liquid absorption was developed, the mass transfer and dynamic parameters, such as the absorption rate constant, the overall reaction rate constant, the second-order reaction rate constant and the enhancement factor, were evaluated. The relationship between second-order reaction rate constant and the reaction temperature was obtained, the effect of solution concentration on the enhancement factor was also assessed, and the activation energy was estimated at a value of 20.38 kJ/mol. © 2018, Science Press. All right reserved.

关键词： Kinetics

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Molecular sieving through a graphene nanopore： non-equilibrium molecular dynamics simulation

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Science Bulletin 2017年第8期62卷 554-562页

作者： Chengzhen Sun Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Two-dimensional graphene nanopores have shown great promise as ultra-permeable molecular sieves based on their size-sieving effects. We design a nitrogen/hydrogen modified graphene nanopore and conduct a transient non-equilibrium molecular dynamics simulation on its molecular sieving effects. The distinct time-varying molecular crossing numbers show that this special nanopore can efficiently sieve CO_2 and H_2S molecules from CH_4 molecules with high selectivity. By analyzing the molecular structure and pore functionalization-related molecular orientation and permeable zone in the nanopore, density distribution in the molecular adsorption layer on the graphene surface, as well as other features, the molecular sieving mechanisms of graphene nanopores are revealed. Finally, several implications on the design of highly-efficient graphene nanopores, especially for determining the porosity and chemical functionalization, as gas separation membranes are summarized based on the identified phenomena and mechanisms.

关键词： Graphene nanopore Molecular sieve Molecular dynamics Gas separation membrane

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Fully resolved simulations of a stationary finite-sized particle in wall turbulence over a rough bed

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Physical Review Fluids 2019年第9期4卷 094302-094302页

作者： Xing Li S. Balachandar Hyungoo Lee Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Mechanical & Aerospace Engineering University of Florida Gainesville Florida 32608 USA Power Reactor Development Division Korea Atomic Energy Research Institute Daedeok-daero 989 Yuseong-gu Daejeon 305–353 Republic of Korea

Understanding the force on a finite-sized particle immersed in a turbulent boundary layer close to a rough wall is of fundamental importance in predicting particle motion in a variety of industrial and environmental applications. Here we perform fully resolved direct numerical simulations with an immersed boundary method to investigate the forces on a stationary finite-sized particle in wall turbulence over a rough bed. Results show that for the particle sitting on the rough bed, lift is the main contributor to wall-normal force and can be well predicted with proper application of existing force models. The higher lift force is mainly due to the sweep events which temporarily increase the relative velocity as well as local shear magnitude. In contrast, for a particle located slightly away from the rough bed, the wall-normal force is mainly due to the wall-normal component of drag, so ejections and outward interactions are responsible for the increase in the wall-normal force. The standard drag law with near-wall correction can reasonably predict this wall-normal force on the particle, except for the large fluctuations due to self-induced vortex shedding.

关键词： Fluid-particle interactions Sediment transport

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The application of dual-mesh coupled heat transfer porous media model on the numerical simulation of a shell-tube heat exchanger

The application of dual-mesh coupled heat transfer porous me...

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International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting

作者： Song, Guangdong Yang, Qingchuan Qiu, Binbin Yang, Hongyi Yu, Huajin Liu, Mengmeng China Institute of Atomic Energy Beijing102413 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

It is an urgent demand to find an alternative model to replace the actual tube bundles area when using numerical simulation to study the Intermediate Heat Exchanger(IHX) of a Sodium-cooled Fast Reactor. An appropriate alternative model can be a substitute for the actual model of IHX in terms of heat transfer and fluid flow. Dual-mesh coupled heat transfer is used based on the porous media model in FLUENT to simulate the flow field of a simple shell-tube heat exchanger and get temperature, velocity and pressure field data of the primary and the secondary fluid simultaneously. The result meets well with that acquired from the calculation of an actual model which proves that the method in this paper is reliable and is able to reduce the modeling and meshing work. © 2018 International Topical Meeting on Advances in Thermal Hydraulics, ATH 2018 - Embedded Topical Meeting. All rights reserved.

关键词： Mesh generation

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Deciphering Ligand Controlled Structural Evolution of Prussian Blue Analogues and Their Electrochemical Activation during Alkaline Water Oxidation

引用

Angewandte Chemie 2022年第49期134卷

作者： Baghendra Singh Pandian Mannu Yu-Cheng Huang Ravi Prakash Shaohua Shen Chung-Li Dong Arindam Indra Department of Chemistry IIT(BHU) Varanasi UP-221005 India Department of Physics Tamkang University New Taipei City Taiwan School of Material Science and Technology IIT(BHU) Varanasi UP-221005 India International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi An Shi Xi'an 710049 China

Herein, we have demonstrated the control over the structure of precatalysts to tune the properties of the active catalysts and their water oxidation activity. The reaction of K 3 [Fe(CN) 6 ] and Na 2 [Fe(CN) 5 (NO)] with Co(OH) 2 @CC produced precatalysts PC-1 and PC-2, respectively, with distinct structural and electronic features. The replacement of the −CN group with strong π-acceptor −NO modulates the electronic and atomic structure of PC-2. As a result, a facile electrochemical transformation of PC-2 into active catalyst Fe−Co(OH) 2 -Co(O)OH (AC-2) has been attained only in 15 CV cycles while 600 CV cycles are required for the electrochemical activation of PC-1 into AC-1. The X-ray absorption studies reveal the contraction of the Co−O and Fe−O bond in AC-2 because of the presence of a higher amount of Co 3+ and Fe 3+ than in AC-1. The high valent Co 3+ and Fe 3+ modulates the electronic properties of AC-2 and assists in the O−O bond formation, leading to the improved water oxidation activity.

关键词： Electrochemical Reconstruction Oxygen Evolution Reaction Prussian Blue Analogue Ultrathin Nanosheets XAS Studies

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Adsorption and Diffusion of Gas Molecules on Graphite Surface

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第1期39卷 110-113页

作者： Sun, Cheng-Zhen Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The adsorption and diffusion characteristics of gas molecules on graphite surface are investigated by molecular dynamics simulations. The results show that the adsorption intensity of gas molecules on graphite surface is related to the atomic interactions between gas molecules and carbon atoms in graphite;different gas molecules present distinct adsorption intensities on graphite surface. The adsorption characteristics can be described by the Langmuir isothermal adsorption model, where the molecular number density in the adsorption layer increases with increasing gas pressure. From the decreasing diffusion coefficients with increasing gas pressure and the normal probability distribution of molecular moving distance in a certain time period, it is concluded that the gas diffusion on graphite surface is mainly controlled by the molecular collisions and approaches the bulk diffusion phenomenon. Accordingly, the molecular number density in the adsorption layer has a great effect on the surface diffusion coefficients, resulting in the obviously lower diffusion coefficients of CO2 and H2S molecules with stronger adsorption intensities than those of CH4 and N2 molecules with weaker adsorption intensities. © 2018, Science Press. All right reserved.

关键词： Adsorption

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Current Density Regulating Lithium Metal Directional Deposition for Long Cycle Life Lithium Metal Batteries

SSRN

引用

SSRN 2020年

作者： Mao, Heng Yu, Wei Cai, Zhuanyun Liu, Guixian Liu, Limin Wen, Rui Su, Yaqiong Xi, Kai Li, Benqiang Da, Xinyu Kou, Huari Yan, Wei Ding, Shujiang Xi'an Key Laboratory of Sustainable Energy Materials Chemistry School of Chemistry Xi’an Jiaotong University & Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Key Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing100190 China Cambridge Graphene Centre Department of Engineering University of Cambridge CambridgeCB3 0FA United Kingdom Department of Mechanical Engineering University of Michigan-Dearborn DearbornMI48128 United States Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

Uncontrolled dendrite formation in the high energy density of lithium metal batteries (LMBs) may pose serious safety risks. Numerous works have been reported to protect separator. However, these methods still couldn’t inhibit the dendrite upward growth to protect the separator, effectively. Here, we introduce a novel “orientated-growth” strategy that makes the depositional interface transfer to the anode/current collector interface from the anode/separator interface. We placed a layer of cellulose/graphene carbon composite aerogel (CCA) between the current collector and the anode (CCA-Li). This layer works as the charge organizer;it induces a higher current density distribution and makes Li prefer to deposit in the bottom CCA layer of CCA-Li electrode. Both in-situ and ex-situ images of the electrode demonstrate the anode part of the cell has been flipped;with the new deposited particles facing the current collector and smooth surface facing the separator. Electrochemical characterization of the electrode in half and full cells showed outstanding cyclic stability and rate capability, with the CCA-Li/LPF full cell able to maintain 94% of its initial capacity after 1000 cycles. We believe that the innovative strategy would promote the leapfrog development for LMBs. © 2020, The Authors. All rights reserved.

关键词： Electric current collectors

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