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Experimental investigation of inflow-outflow asymmetry in induced-charge electro-osmosis

Energy Storage and Saving 2024年第1期3卷 16-22页

作者： Lingqi Zhao Tianwei Lai Yingke Gao Shaohang Yan Mingzhe Liu Yu Hou State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China MOE Key Laboratory of Cryogenic Technology and Equipment Xi’an Jiaotong UniversityXi’an710049China

Induced-charge electro-osmosis(ICEO)is a research hotspot in bioengineering and analytical ***-out{1. asymmetry of ICEO was reported in the existing literatures,but systematic study on this phenomenon is *** this experimental study,we found that in strong electric fields,not only the velocity magnitude but also the vortex positions of ICEO are asymmetrical along the in{1. and out{1. directions because of the pronounced non-uniform surface electrokinetic *** the in{1. and out{1. directions,the amplitudes of velocities are unequal,ICEO maximum velocity positions change depending on the electric field intensity and sodium chloride(NaCl)***,the distances between vortex centers are *** NaCl solution concentration of 0.001.mol⋅L^(-1.,the out{1. velocity almost *** asymmetry rises with the increasing electric field *** new discoveries can direct the application of microscale devices.

关键词： Induced-charge electro-osmosis Micro-particle image velocimetry Inflow-outflow asymmetry

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Dicyanovinyl-unit-induced absorption enhancement of iridium(III) complexes in long-wavelength range and potential application in dye-sensitized solar cells

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Science China Chemistry 2015年第4期58卷 658-665页

作者： Dongdong Wang Hua Dong Xiaoyu Zhang Yong Wu Shaohua Shen Bo Jiao Zhaoxin Wu Min Gao Geng Wang Department of Applied Chemistry School of Science Xi’an Jiaotong University Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic and information Engineering Xi’An Jiaotong University Key Laboratory for Advanced Materials Institute of Fine Chemicals and Department of Chemistry East China University of Science and Technology International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

Iridium complexes with dicyanovinyl-grafted phenylpyridine/l-phenylisoquinoline as ligands are synthesized and their photo- physical, electrochemical, and sensitization properties in DSSCs are investigated. The iridium complexes present significantly enhanced absorption from 400 to 525 nm. The 1.phenylisoquinoline-based iridium complex show bathochromic-shift emission in DMSO solution compared with their phenylpyridine-based counterpart, while their absorption response and photoluminescence peak in solid show little difference despite extension of the conjugated system. Using DSSCs, the conversion efficiency of 0.62% and open-circuit current of 1.4 mA/cm2 is achieved. The poor performance is attributed to the excited-state properties of iridium complexes according to the TD-DFT calculation.

关键词： dicyanovinyl group iridium complexes absorption response dye-sensitized solar cell

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Photocatalytic water oxidation over BiVO_4 with interface energetics engineered by Co and Ni-metallated dicyanamides

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Chinese Journal of Catalysis 2018年第3期39卷 502-509页

作者： Yi Shang Fujun Niu Shaohua Shen International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049 Shaanxi China

Photocatalytic water oxidation based on semiconductors usually suffers from poor charge transfer from the bulk to the interface,which is necessary for oxygen ***,we construct a hybrid artificial photosynthesis system for photocatalytic water *** system consists of BiVO4as the light harvester,a transitional metal complex(M(dca)2,M=Co,Ni,dca:dicyanamide)as the water oxidation catalyst,and S2O82?as a sacrificial electron *** system exhibits enhanced oxygen evolution activity when M(dca)2is *** BiVO4/Co(dca)2and Bi‐VO4/Ni(dca)2systems exhibit excellent oxygen evolution rates of508.1.nd297.7μmol/(h·g)compared to the pure BiVO4which shows a photocatalytic oxygen evolution rate of252.2μmol/(h·g)during6h of photocatalytic ***(dca)2is found to be more effective than Ni(dca)2as a water oxidation *** enhanced photocatalytic performance is ascribed to the M(dca)2‐engineered BiVO4/electrolyte interface energetics,and to the M(dca)2‐catalyzed surface water *** two factors lead to a decrease in the energy barrier for hole transfer from the bulk to the surface of BiVO4,which promotes the water oxidation kinetics.

关键词： Metal complex BiVO4 Water oxidation Photocatalysis Interfacial kinetics

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Microstructures and characteristics of deep trap levels in ZnO varistors doped with Y_2O_3

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Science China(Technological Sciences) 2009年第12期52卷 3668-3673页

作者： LIU Jun 1.,HU Jun 1.,HE JinLiang 1.,LIN YuanHua 2 &LONG WangCheng 1.1.0} {1. laboratory of power Systems,Department of Electrical engineering,Tsinghua University,Beijing 1.0084,China 2state {1. laboratory of New Ceramics and Fine Processing,Department of Material Science and engineering,Tsinghua University, Beijing 1.0084,China 1. State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China 2. State Key Laboratory of New Ceramics and Fine Processing Department of Material Science and Engineering Tsinghua University Beijing 100084 China

In this paper discussions on ZnO based varistor ceramics doped with different ratios of Y2O3 are *** on the phase and microstructures of the samples indicates that an additional phase is detected in the samples doped with Y2O3,and the average grain size of the specimens decreases from about 9.2μm to 4.5μm,with an increase in the addition of Y2O3 from 0 mol%to 3 mol%.The corresponding varistor’s voltage gradient markedly increases from 462 V/mm to 2340 V/mm,while the nonlinear coefficient decreases from 22.3 to 1..5,***,the characteristics of deep trap levels in these ZnO samples are investigated by measuring their dielectric *** trap energy level and capture cross section evaluated by relaxation peak of the Cole-Cole plot vary slightly as the addition of Y2O3 *** traps may be ascribed to the intrinsic defects of ZnO lattice.

关键词： ZnO varistors Y2O3 electrical properties deep trap levels

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Laser-Synthesized Ligand-Free Cu Nanocatalysts in Electrochemical CO2 Reduction to Methane

arXiv

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arXiv 2025年

作者： Ye, Taiping Lactionov, Artyom Sozaev, Islam Popov, Anton Klimentov, Sergei Kabashin, Andrei V. Liu, Ya International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi 710049 China National Research Nuclear University MEPhI Moscow115409 Russia CNRS LP3 Aix-Marseille Université Marseille13288 France

Electrochemical CO2 reduction (eCO2R) represents a pivotal strategy for mitigating global carbon emissions while simultaneously converting renewable energy into storable chemical fuels. Copper-based catalysts have been extensively explored in this field due to their unique capability to catalyze multi-carbon products. However, the intrinsic complexity of eCO2R pathways on Cu surfaces often leads to mixed product distributions, posing a significant challenge for achieving high selectivity toward a single desired hydrocarbon. Herein, we report a breakthrough in methane selectivity using laser-synthesized, ligand-free Cu nanomaterials. Unlike conventional Cu catalysts that produce diverse products, these ligand-free nanoparticles exhibit unprecedented selectivity for methane (CH4) with a Faradaic efficiency (FE) exceeding 70% at superior overpotentials. The absence of surface ligands, a direct consequence of the ultrafast laser ablation synthesis, ensures abundant exposed active sites with tailored electronic and geometric configurations. We attribute the exceptional methane selectivity to the synergistic effects of active sites-rich surfaces and optimized *CO intermediate binding energetics, which favor the protonation pathway toward CH4 rather than C–C coupling. This work not only resolves the longstanding selectivity dilemma in Cu-catalyzed eCO2R but also establishes laser-synthesized ligand-free nanomaterials as a versatile platform for designing high-performance electrocatalysts. Copyright © 2025, The Authors. All rights reserved.

关键词： Nanoparticles

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Bacterial Cellulose Composite Solid Polymer Electrolyte With High Tensile Strength and Lithium Dendrite Inhibition for Long Life Battery

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Energy & Environmental Materials 2021年第3期4卷 434-443页

作者： Yuhan Li Zongjie Sun Dongyu Liu Shiyao Lu Fei Li Guoxin Gao Min Zhu Mingtao Li Yanfeng Zhang Huaitian Bu Zhiyu Jia Shujiang Ding Department of Applied Chemistry School of ChemistryXi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Materials and Nanotechnology SINTEF IndustryForskningsveien 1Oslo 0373Norway School of Chemistry and Chemical Engineering MOE Key Laboratory of Cluster ScienceBeijing Institute of TechnologyBeijing 100081China

The development of metallic lithium anode is restrained by lithium dendrite growth during *** solid polymer electrolyte with high mechanical strength and lithium ion conductivity could be applied to inhibit lithium dendrite *** prepare the high-performance solid polymer electrolyte,the environment-friendly and cheap bacterial cellulose(BC)is used as filler incorporating with PEO-based electrolyte owing to good mechanical properties and Li salts ***/Li TFSI/BC composite solid polymer electrolytes(CSPE)are prepared easily by aqueous mixing in *** lithium ion transference number of PEO/Li TFSI/BC CSPE is 0.57,which is higher than PEO/Li TFSI solid polymer electrolyte(SPE)(0.409).The PEO/Li TFSI/BC CSPE exhibits larger tensile strength(4.43 MPa)than PEO/Li TFSI SPE(1.34 MPa).The electrochemical window of composite electrolyte is widened 1.43 V by adding *** functional theory calculations indicate that flex of PEO chains around Li atoms is suppressed,suggesting the enhanced lithium ion *** molecular orbitals results suggest that an unfavorable intermolecular charge transfer lead to achieve higher potential for BC composite *** solid-state Li metal battery with PEO/Li TFSI/BC CSPE delivers longer cycle life for 600 cycles than PEO/Li TFSI SPE battery(50 cycles).Li symmetrical battery using PEO/Li TFSI/BC CSPE could be stable for 1.60 h.

关键词： all solid-state battery bacterial cellulose composite polymer electrolyte DFT calculations HOMO and LUMO

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Synthesis of CdS/CNTs photocatalysts and study of hydrogen production by photocatalytic water splitting

Synthesis of CdS/CNTs photocatalysts and study of hydrogen p...

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作者： Wang, Xixi Liu, Maochang Chen, Qingyun Zhang, Kai Chen, Jie Wang, Meng Guo, Penghui Guo, Liejin International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Shaanxi 710049 China

A series of CdS and CdS/CNTs photocatalysts were successfully prepared by hydrothermal method and they were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible optical absorption spectra (UV-Vis), etc. By studying their photocatalytic properties, it is found that, for CdS, photocatalysts prepared in appropriate alkaline environment presented higher hydrogen production activity, reaching 794.6 μmol h-1.g-1.the photocatalytic activity of CdS was obviously enhanced by combining it with CNTs via a special two-step hydrothermal method, and the corresponding hydrogen production rate reached 1.771.mmol h-1.g -1.the photocatalytic activity was further improved by loading co-catalyst NiS, achieving 1..1. mmol h-1.g-1. © 201., Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Cadmium sulfide

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Dynamic analysis on methanation reactor using a double-input–multi-output linearized model

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Chinese Journal of Chemical engineering 2015年第2期23卷 389-397页

作者：李星星李佳庚杨伯伦张勇 Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Northwest Research Institute of Chemical Industry

A double-input–multi-output linearized system is developed using the state-space method for dynamic analysis of methanation process of coke oven *** stability of reactor alone and reactor with feed-effluent heat exchanger is compared through the dominant poles of the system transfer *** single or double disturbance of temperature and CO concentration at the reactor inlet,typical dynamic behavior in the reactor,including fast concentration response,slow temperature response and inverse response,is revealed for further understanding of the counteraction and synergy effects caused by simultaneous variation of concentration and *** results show that the stability of the reactor loop is more sensitive than that of reactor alone due to the positive heat ***,with the decrease of heat exchange efficiency,the reactor system may display limit cycle behavior for a pair of complex conjugate poles across the imaginary axis.

关键词： Coke oven gas methanation Synthetic natural gas Double-input–multi-output linearized system Dynamic analysis Limit cycle behavior

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P-Type Chemical Doping-Induced High Bipolar Electrical Conductivities in a Thermoelectric Donor–Acceptor Copolymer

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CCS Chemistry 2021年第10期3卷 2482-2493页

作者： Jing Wang Yizhuo Wang Qing Li Zhanchao Li Kuncai Li Hong Wang Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710054 State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710054

Typically,conducting polymers transfer either electrons or *** is rare to see high bipolar(p-and n-type)electrical conductivities within a single bulk doped organic polymer without the assistant of gate ***,we report that FeCl3-doped solutionprocessable D–A copolymer poly(2,5-bis(2-octyldo decyl)-3,6-di(thiophen-2-yl)diketopyrrolo[3,4-c]pyrrole-1.4-dione-alt-thieno[3,2-b]thiophen)(DPPTTT)could exhibit a high p-type electrical conductivity of 1.0.6 S/cm and a good n-type electrical conductivity of 1..2 S/cm by engineering the doping level.

关键词： polarity switching donor-acceptor copoly mer thermoelectric organic diode p-ty pe doping

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Experimental investigation on heat transfer characteristics of high temperature air in round tube

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 200-205页

作者： Qin, Hao Wang, Chenglong Tian, Wenxi Qiu, Suizheng Su, Guanghui Department of Nuclear Science and Technology Xi'an Jiaotong University Shaanxi Xi'an710049 China Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology Xi'an Jiaotong University China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Air is widely utilized as working fluid in heat exchangers with high heat flux and high temperature, and the empirical correlations for predicting local and total heat transfer coefficients are indispensable for thermal design and optimization of the heat exchange applications. Experimental investigation on heat transfer characteristics of high temperature air in round tube is conducted. The experimental system is designed and constructed. The data processing method for obtaining wall temperature and heat transfer coefficient is introduced. The measured local and total heat transfer coefficients are compared with the widely adopted correlations, including Taylor's correlation and Gnielinski's correlation. The suggested empirical correlations obtained from the experimental data are presented, which may contribute to the design of heat exchangers concerning with high temperature air. © 2021.Xi'an Jiaotong University

关键词： Heat transfer coefficients

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