检索结果-内蒙古大学图书馆

High-Temperature Flexible Nanocomposites with Ultra-High Energy Storage Density by nanostructured MgO fillers

ADVANCED FUNCTIONAL MATERIALS 2022年第31期32卷

作者： Wang, Pengjian Guo, Yan Zhou, Di Li, Da Pang, Lixia Liu, Wenfeng Su, Jinzhan Shi, Zhongqi Sun, Shikuan Xi An Jiao Tong Univ Sch Elect & Informat Engn Minist Educ & Int Ctr Dielect Res Elect Mat Res LabKey Lab Xian 710049 Peoples R China Xian Technol Univ Microoptoelect Syst Labs Xian 710032 Peoples R China Xi An Jiao Tong Univ State Key Lab Elect Insulat & Power Equipment Xian 710049 Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Int Res Ctr Renewable Energy Xian 710049 Peoples R China Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China Foshan Univ Sch Mat Sci & Energy Engn Foshan 528000 Guangdong Peoples R China

High-temperature performance is critical to the dielectric polymer capacitors used in environment electronic and high-power applications. Here, the authors report a composite comprising polyimide (PI) dielectric polymers blended with high-insulation magnesium oxide (MgO) nano-filler that exhibits high breakdown strength, wide temperature range, and low dielectric loss. However, most dielectric polymers possess excellent energy storage properties at room temperature and cannot be used at high temperatures above 100 degrees C. Polyimide dielectric nanocomposites prepared by in situ polymerization, which are composed of easily prepared MgO fillers, have different morphologies, such as nanoparticles (0D), nanowires (1D), and nanoplates (2D). The experimental results show that the insulation behavior and breakdown strength of polymer composites are closely related to the morphology of MgO fillers, and the rationality of this conclusion is further proved by finite-element simulation results. The polymer composites containing ultra-low content (0.5 vol%) MgO nanosheets produce an ultra-high capacitance performance, that is, the discharge energy density is 4.78 J cm(-3) at 150 degrees C, which is significantly better than the most reported dielectric polymers and nanocomposites.

关键词： breakdown strength dielectric energy storage capacitors magnesium oxide

来源：评论

学校读者我要写书评

暂无评论

Preliminary numerical investigation of TRISO-matrix interface debonding characteristics in fully ceramic microencapsulated fuel

引用

ANNALS OF NUCLEAR ENERGY 2021年 159卷

作者： Zhang, Cheng Wang, Yangyang Wu, Yingwei Liu, Shichao Chen, Ping He, Ya'nan Yin, Chunyu Zhang, Jing Tian, Wenxi Su, G. H. Qiu, Suizheng Wu, Junmei Xi An Jiao Tong Univ Sch Nucl Sci & Technol State Key Lab Multiphase Flow Power Engn Shaanxi Key Lab Adv Nucl Energy & Technol Xian 710049 Peoples R China Nucl Power Inst China Sci & Technol Reactor Syst Design Technol Lab Chengdu 610213 Peoples R China Xi An Jiao Tong Univ State Key Lab Strength & Vibrat Mech Struct Xian 710049 Peoples R China

The bonding mode of NITE-SiC matrix and TRISO particles has a great impact on the fracture mechanisms of the Fully Ceramic Microencapsulated (FCM) fuel. Combination strength and interface debonding characteristics are of great significance when evaluating the thermo-mechanical behavior of a FCM fuel. In this study, a finite element method (FEM) model for TRISO-matrix debonding characteristics analysis was presented based on the cohesive zone model (CZM). The CZM was coupled with several irradiation behaviors (burnup, fission gas release, gap/plenum pressure, etc.) and thermo-mechanical behaviors (irradiation-induced dimensional change (IIDC), contact, heat generation, conduction, gap heat transfer, thermal expansion, and creep etc.), and developed to investigate the interface debonding characteristics of TRISO coated FCM Fuel preliminarily. A 3-dimensional multiphysics modeling approach has been successfully applied to realize simulations of a representative FCM fuel unit, also a uniformly distributed FCM layer. The NITE-SiC and OPyC interface debonding characteristics model was well performed, and was validated with CZM theory. Moreover, the effects of burnup, particle spacing, stress distributions of matrix, interfacial bonding strength and other key parameters in CZM model, were studied and investigated. (C) 2021 Published by Elsevier Ltd.

关键词： FCM Cohesive zone model Interface debonding characteristics Fracture mechanism

来源：评论

学校读者我要写书评

暂无评论

MEA/SG capture CO2 in thermal electrochemical co-drive system

引用

CHEMICAL engineering AND PROCESSING-PROCESS INTENSIFICATION 2020年 147卷

作者： Ding, Wancheng Yu, Yunsong Zhang, Zaoxiao Wang, Geoff XianJiaotong Univ Sch Chem Engn & Technol 28 Xianning West Rd Xian 710049 Peoples R China XianJiaotong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Peoples R China Univ Queensland Sch Chem Engn St Lucia Qld 4072 Australia

The Thermal Electrochemical Co-drive System (TECS) has the advantages of high desorption rate and low energy consumption. However, the fluid flow and capture performance is still unknown in TECS. Thus, a comprehensive experiment and simulation work on TECS is performed to demonstrate the fluid flow and capture performance in a pilot-scale TECS. The reaction kinetics of the electrolyzed MEA-SG solution is discussed. A pilot-scale TECS is set up and gas-liquid two-phase flow model is developed for the TECS. According to the numerical computation and experiment, the gas-liquid two-phase flow field was analyzed under the thermal electrochemical co-drive conditions. The mechanism of CO2 capture was clearly understood. The synergy of thermal desorption and electrochemical desorption was quantified numerically. The results showed that the temperature of TECS was reduced below 333 K and the energy consumption amount was determined at 1.3 G J/t to 2.1 G J/t, which is much lower than the conventional process. LNG cold energy reduced the desorption energy consumption.

关键词： CO(2)capture Thermal electrochemical co-drive system Numerical simulation Energy consumption

来源：评论

学校读者我要写书评

暂无评论

Advanced exergy analysis of a Joule-Brayton pumped thermal electricity storage system with liquid-phase storage

引用

ENERGY CONVERSION AND MANAGEMENT 2021年 231卷

作者： Zhao, Yongliang Liu, Ming Song, Jian Wang, Chaoyang Yan, Junjie Markides, Christos N. Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China Imperial Coll London Dept Chem Engn Clean Energy Proc CEP Lab London SW7 2AZ England

Pumped thermal electricity storage is a thermo-mechanical energy storage technology that has emerged as a promising option for large-scale (grid) storage because of its lack of geographical restrictions and relatively low capital costs. This paper focuses on a 10 MW Joule-Brayton pumped thermal electricity storage system with liquid thermal stores and performs detailed conventional and advanced exergy analyses of this system. Results of the conventional exergy analysis on the recuperated system indicate that the expander during discharge is associated with the maximum exergy destruction rate (13%). The advanced exergy analysis further reveals that, amongst the system components studied, the cold heat exchanger during discharge is associated with the highest share (95%) of the avoidable exergy destruction rate, while during charge the same component is associated with the highest share (64%) of the endogenous exergy destruction rate. Thus, the cold heat exchanger offers the largest potential for improvement in the overall system exergetic efficiency. A quantitative analysis of the overall system performance improvement potential of the recuperated system demonstrates that increasing the isentropic efficiency of the compressor and turbine from 85% to 95% significantly increases the modified overall exergetic efficiency from 37% to 57%. Similarly, by increasing the effectiveness and decreasing the pressure loss factor of all heat exchangers, from 0.90 to 0.98 and from 2.5% to 0.5% respectively, the modified overall exergetic efficiency increases from 34% to 54%. The results of exergy analyses provide novel insight into the innovation, research and development of pumped thermal electricity storage technology.

关键词： Advanced exergy analysis Joule-Brayton cycle Energy storage Pumped thermal electricity storage PTES Sensible heat thermal storage

来源：评论

学校读者我要写书评

暂无评论

Passive decay heat removal system design for the integral inherent safety light water reactor (I²S-LWR)

引用

ANNALS OF NUCLEAR ENERGY 2020年 145卷

作者： Wang, Mingjun Manera, Annalisa Petrov, Victor Memmott, Matthew J. Qiu, Suizheng Su, G. H. Xi An Jiao Tong Univ Dept Nucl Sci & Technol State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China Univ Michigan Dept Nucl Engn & Radiol Sci Ann Arbor MI 48109 USA Brigham Young Univ 350 Clyde Bldg Provo UT 84602 USA

The Integral, Inherently Safe Light Water Reactor ((IS)-S-2-LWR) is an innovative Pressurized Water Reactor (PWR) concept being developed by a multi-institutional team led by Georgia Tech and in collaboration with Westinghouse, under the Department of Energy's Nuclear Energy University Programs Integrated Research Projects (DOE NEUP IRP). The University of Michigan leads the design of the thermal-hydraulic and passive safety systems, in collaboration with Westinghouse and Bringham Young University. The I2S-LWR features an integral primary system configuration and is more conducive to the implementation of inherent safety features by eliminating potential accidents. In this paper, a novel passive Decay Heat Removal System (DHRS), is presented, consisting of a primary loop, an intermediate loop and a cooling tower loop. This passive system is designed to remove the I2S-LWR decay heat in the case of emergency heat removal transients, without the need for external power or operator action. The proposed DHR uses atmosphere as ultimate heat sink, to achieve indefinite decay heat removal. In this paper, firstly, the design of primary and secondary DHRS heat exchangers is optimized. Then the DHR heat removal characteristics are studied using the best-estimate thermal hydraulic code RELAP5. In addition, CFD simulations have been performed in order to investigate the DRHS helical coil primary heat exchanger performance with different coil pipe arrangements, and optimize its design. The performance of the proposed DHRS concept is investigated in case of a Station Black-Out (SBO) scenario. Operation of two, three and four DHRS trains is studied respectively. The results show that three out of four DHRS trains are sufficient to indefinitely remove the core decay heat successfully during a SBO, and keep the reactor in a safe state without the need of any other auxiliary active system. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： DHR Integral reactor Station Black-Out Heat removal

来源：评论

学校读者我要写书评

暂无评论

Enhanced viscoelastic focusing of particle in microchannel

引用

ELECTROPHORESIS 2020年第1-11期41卷 973-982页

作者： Fan, Liang-Liang Zhao, Zhi Tao, Yi-Yi Wu, Xu Yan, Qing Zhe, Jiang Zhao, Liang Xi An Jiao Tong Univ Sch Mech Engn Xian Shaanxi Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Univ Akron Dept Mech Engn Akron OH 44325 USA

A novel method is reported to enhance the focusing of microparticle in the viscoelastic fluid. Gradually contracted geometry is designed in microchannel, which changes the distribution of the elastic lift force on the cross section. Additionally, it induces the viscous drag force and the Saffman lift force in the lateral direction. Under the combined effect of these forces, microparticles fast migrate to the center of the channel. In comparison to the channel with constant cross section, the present channel significantly enhances the particle's lateral migration, leading to efficient viscoelastic particle focusing in a short channel length. The influence of flow rate, channel length, particle size and fluid property on the particle focusing is also investigated. With simple structure, small footprint and perfect particle focusing performance, the present device has great potential in the particle focusing processes in various lab-on-a-chip applications.

关键词： Elastic lift force lab chip Microfluidic Particle focusing Viscous drag force

来源：评论

学校读者我要写书评

暂无评论

Experimental Investigation on Flash Evaporation Related to Pipe Leakage

引用

JOURNAL OF NUCLEAR engineering AND RADIATION SCIENCE 2020年第1期6卷 011401页

作者： Cai, Benan Zhang, Qi Weng, Yu Gu, Hongfang Wang, Haijun Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China

Pipelines such as the surge line and main pipe are easily subjected to thermal stratification and thermal fatigue as a result of the nonuniform temperature distribution in the nuclear power plants. When the surge line or main pipe subjected to thermal stratification and thermal fatigue keeps operating for long time, the pipe leakage may happen due to the existence of pipeline crack. When the fluids with high temperature and pressure leak in the crack, the water will evaporate quickly, which means this process belongs to spray flash evaporation process. The flash evaporation related to pipe leak was experimentally studied in the paper. The experiment was carried out under high temperature and high pressure with low spray rate. The temperature and relative humidity (T&H) variations over time were monitored in the experiment with installing T&H detectors. The T&H variations at different measurement positions and with different spray rates were analyzed, respectively. In addition, the effect of the dimensionless parameters including the Weber number and Jakob number was also investigated. Results indicated that the response speed increased with the increase of the spray flow rate. Higher Weber number and higher Jakob number led to higher evaporation rate. The slight pipe leakage can be predicted by using the (T&H) in the hazardous areas.

关键词： flash evaporation high temperature and pressure relative humidity pipe leak

来源：评论

学校读者我要写书评

暂无评论

Obstacles of solar-powered photocatalytic water splitting for hydrogen production: A perspective from energy flow and mass flow

引用

ENERGY 2019年 172卷 1079-1086页

作者： Guo, Liejin Chen, Yubin Su, Jinzhan Liu, Maochang Liu, Ya Xi An Jiao Tong Univ Int Res Ctr Renewable Energy State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China

Solar-driven photocatalytic water splitting for hydrogen production has emerged as one of the foremost scientific issues. However, the efficient, low-cost, and large-scale operable system is still missing. Photocatalytic water splitting has multiple processes that involve light absorption, charge excitation and transfer, mass transfer, and chemical reaction, making it extremely complicated and challenging. Herein, we review the whole-process photocatalytic water splitting from two kinds of "flow": energy flow and mass flow. The energy flow represents transmission and conversion of solar energy through the concentrator, reactor, reaction solution, and photocatalyst. The mass flow refers to transfer of reactants and products in the gas-liquid-solid multiphase environment. For the first time, we clearly describe the energy flow and mass flow in photocatalytic water splitting from multiple spatiotemporal scales, and point out that the low efficiencies of photocatalytic water splitting are attributed to obstacles in energy flow and mass flow, as well as non-coupling and mismatching of energy flow and mass flow. The mechanistic insights learned from this perspective indicate that, in addition to the material optimization, the scientific and engineered design of sunlight collection, interfacial reaction, and mass transfer is of great significance. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Solar energy Hydrogen production Photocatalytic water splitting Energy flow Mass flow

来源：评论

学校读者我要写书评

暂无评论

Modulating charge centers and vacancies in P-CoNi loaded phosphorus-doped ZnIn2S4 nanosheets for H2 and H2O2 photosynthesis from pure water

引用

NANO ENERGY 2023年 117卷

作者： Xue, Fei Zhang, Chunyang Peng, Huiping Sun, Lin Yan, Xueli Liu, Feng Wu, Wentong Liu, Maochang Liu, Liangbin Hu, Zhiwei Kao, Cheng-Wei Chan, Ting-Shan Xu, Yong Huang, Xiaoqing Xiamen Univ Coll Chem & Chem Engn State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China Guangdong Univ Technol Sch Mat & Energy Collaborat Innovat Ctr Adv Energy Mat Guangzhou Key Lab Low Dimens Mat & Energy Storage Guangzhou 510006 Peoples R China Xi An Jiao Tong Univ Int Res Ctr Renewable Energy State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China Max Planck Inst Chem Phys Solids Nothnitzer Str 40 D-01187 Dresden Germany Natl Synchrotron Radiat Res Ctr 101 Hsin Ann Rd Hsinchu 30076 Taiwan Innovat Lab Sci & Technol Energy Mat Fujian Prov I Xiamen 361005 Peoples R China

Photocatalytic water splitting has recently attracted increasing interests for solar to chemical energy conversion. Nevertheless, the high-efficiency process for photocatalytic water splitting is driven by recombination of photogenerated electron-hole pairs and the resultant low H2 productivity. Herein, we demonstrate that P-doping induced positive charge centers (P delta+) and indium vacancies (VIn) in ZnIn2S4 (ZIS) nanosheets can significantly promote photosplitting pure water to simultaneously produce H2 and H2O2. Microstructural and spectroscopic analysis suggest that P delta+ and VIn can trap photogenerated electrons and holes, respectively, as a result of enhanced separation of electron-hole pairs. The optimal catalyst of P-CoNi/ZIS displays a stoichiometric H2 and H2O2 productivity of 1228.7 and 1105.5 mu mol h-1 g-1, respectively, with an apparent quantum efficiency of 6.2% at 365 nm. Impressively, H2 productivity of P-CoNi/ZIS has surpassed most reported catalysts for photocatalytic pure water splitting. This work provides a unique strategy to create efficient photocatalyst for pure water splitting.

关键词： In vacancy P doping Pure water splitting

来源：评论

学校读者我要写书评

暂无评论

Investigation of the charge transport kinetics and photoelectrochemical properties of CuInS2/R-TiO2 NTs heterostructures photoanode

引用

APPLIED SURFACE SCIENCE 2022年 585卷

作者： Lu, Ruo-Chen Zhang, Kai Liu, Xiao-He Chen, Qing-Yun Wang, Yun-Hai Xi An Jiao Tong Univ Int Res Ctr Renewable Energy IRCRE State Key Lab Multiphase Flow Power Engn MFPE Xian 710049 Peoples R China Xian Univ Sci & Technol Coll Geol & Environm Xian 710054 Peoples R China Xi An Jiao Tong Univ Dept Environm Sci & Engn Xian 710049 Peoples R China

It is significant to study the role of Ti3+ sites in heterojunction and its influence on charge transport kinetics for photoelectrochemical water splitting. Here, by using NaBH4 reduction treatment, Ti3+ self-doped reduced TiO2 nanotubes (R-TiO2 NTs) were obtained under mild conditions. CuInS2, a narrow bandgap semiconductor, was uniformly coated on R-TiO2 NTs to form a CuInS2/R-TiO2 NTs heterostructure photoelectrode through a simple one-step pulse electrodeposition method. The charge transfer and recombination process were characterized by the intensity modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS). The results showed that the introduced Ti3+ sites formed an intermediate gap between the valence band and the conduction band. What's more, the heterojunction structure effectively enhanced the interface charge separation, which promoted the surface reaction kinetics. The electron transfer time of CuInS2/R-TiO2 NTs was about 0.28 ms, which was higher than that of the individually R-TiO2 NTs and CuInS2/TiO2 NTs alone. The electron lifetime was extended from 1.19 ms to 3.77 ms. Due to the reduction treatment and surface loading of CuInS2 nanoparticles, the carrier collection efficiency and the charge transfer efficiency of the CuInS2/R-TiO2 NTs were increased to 92.6% and 10.71%, respectively. This study sheds light on the charge transport kinetics of CuInS2/R-TiO2 NTs heterostructures for application in efficient PEC water splitting.

关键词： CuInS2/R-TiO2 NTs heterojunction Photoelectrochemical properties Charge transport kinetics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：