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Activating ZnO nanorod photoanodes in visible light by Cu ion implantation

Nano Research 2014年第3期7卷 353-364页

作者： Meng Wang Feng Ren Guangxu Cai Yichao Liu Shaohua Shen Liejin Guo International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 China School of Physics and Technology Center for Ion Beam Application Wuhan University Wuhan 430072 China

Utilization of visible light is of crucial importance for exploiting efficient semiconductor catalysts for solar water splitting. In this study, an advanced ion implantation method was utilized to dope Cu ions into ZnO nanorod arrays for photoelectrochemical water splitting in visible light. X-ray diffraction （XRD） and X-ray photo-electron spectroscopy （XPS） results revealed that Cu^＋ together with a small amount of Cu^2＋ were highly dispersed within the ZnO nanorod arrays. The Cu ion doped ZnO nanorod arrays displayed extended optical absorption and enhanced photoelectrochemical performance under visible light illumination （A 〉 420 nm）. A considerable photocurrent density of 1. μA/cm^2 at 0.8 V （vs. a saturated calomel electrode） was achieved, which was about 1. times higher than that of undoped ZnO nanorod arrays. This study proposes that ion implantation could be an effective approach for developing novel visible-light-driven photocatalytic materials for water splitting.

关键词： ion implantation Cu ion doping ZnO nanorods photoanode water splitting

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Construction of Pd-M （M = Ni, Ag, Cu） alloy surfaces for catalytic applications

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Nano Research 2018年第2期11卷 780-790页

作者： Xiang Li Xixi Wang Maochang Liu Hongyang Liu Qiang Chen Yadong Yin Mingshang Jin Frontier Institute of Science and Technology (FIST) School of Chemical Engineering and Technology and State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing China Department of Chemistry University of California Riverside USA

The fabrication of ultrathin alloy shells as heterogeneous catalysts to increase the utilization efficiency and enhance the catalytic activity of metal atoms has been recognized as an effective method for the construction of efficient metal nanocatalysts, particularly noble-metal nanocatalysts. In this study, we demonstrate the successful formation of Pd-M （M = Ni, Ag, Cu） alloy shells with a tunable thickness on preformed nanoscale Pd seeds. The success of this synthesis mainly relies on the combination of the slow reduction of ＂M＂ ions and the subsequent diffusion of M ad-atoms into the surface lattice of Pd seeds. The composition of the Pd-M alloy shell is easily tuned by changing the type and amount of the added precursor, and the shell thickness is manipulated according to the reaction time. More significantl the surface structure of these alloy shells is maintained after the reaction, implying that any desired surface structure of Pd-M alloy shells can be prepared by using the appropriate starting materials. Further catalytic evaluation of the hydrogenation of chloronitrobenzenes shows that these alloy surfaces exhibit significantly improved selectivity compared to the Pd seeds. The Pd-Ni alloy surfaces exhibit much better catalytic selectivity （as high as 〉 99%） than Pd catalysts.

关键词： Pd allo3 catalyst shape control hydrogenation

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Electronic Structures and Optical Absorption Properties of Ni-doped Anatase TiO2for Photocatalysis from First-Principles Calculation 18

Electronic Structures and Optical Absorption Properties of N...

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1.th World Hydrogen Energy Conference, WHEC 201.

作者： Liu, Maochang Zhou, Zhaohui Li, Mingtao Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University 28 Xianning Street Shaanxi Xi'an710049 China

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Development of cladding oxidation analysis code [COAC] and application for early stage severe accident simulation of AP1.00

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Progress in Nuclear Energy 2015年 85卷 352-365页

作者： Mao, keyou Wang, Jun Li, Longze Zhang, Yapei Tian, Wenxi Su, Guanghui Qiu, Suizheng Corradini, Michael L. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China College of Engineering University of Wisconsin-Madison Madison 53706 United States

Abstract Clad oxidation is an important phenomenon which can affect core degradation under severe accident conditions. The oxidation process always coincides with cladding material embrittlement. The energy released from the oxidation of cladding material can accelerate the accident process, and the hydrogen released from oxidation may threaten the integrity of vessel. As a consequence, the high temperature clad solid-phase oxidation model research and its code development play an important role in reactor safety analysis. To push the research on this region, a clad solid-phase oxidation analysis code (COAC) is developed by Xi'an Jiaotong University. To verify the quality of COAC, CORA-1. is used as a benchmark. The results show that COAC does produce expected values. COAC is then applied to AP1.00 severe accident calculations. In this case, the station blackout accident (SBO) is modeled. The response of fuel rods under varying natural circulation conditions while coolant pump idle time is calculated. The calculations show that the oxidation of cladding can delay fracturing, and protect its integrity. Meanwhile, the performances of other oxidation models are explored in this paper. © 201. Elsevier Ltd.

关键词： AP1.00 Clad solid-phase oxidation models COAC Hydrogen generation rate

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Thermodynamic optimization of closed air Brayton cycle and air-ORC combined cycle

Thermodynamic optimization of closed air Brayton cycle and a...

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International Conference on power {1. 2021. ICOPE 2021

作者： Qian, Yiran Zhang, Zhuohua Yi, Jingwei Chen, Weixiong Liu, Ming Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Nuclear Power Institute of China Chengdu610213 China

In order to improve the flexibility and adaptability of small mobile nuclear power systems, air is considered as an optional working fluid of nuclear Brayton cycle system. It can avoid the shortage of working fluid under extreme conditions, and ensure the system operation with tight working fluid supply. In this study, simple regenerative cycle (SRC), intercooling regenerative cycle (IRC) and corresponding air-ORC combined cycle (SRCC and IRCC) are proposed and modeled. Thermodynamic analysis of {1. parameters is conducted. Genetic algorithm (GA) is applied for multi-parameter optimization to achieve the maximum cycle efficiency. With the increase of pressure ratio (PR), the efficiency of SRC increases firstly and then decreases. Pressure ratio corresponding to the maximum cycle efficiency increases gradually with turbine inlet temperature. The efficiency of IRC is slightly lower than that of SRC in low pressure ratio region, but IRC maintains a higher efficiency in high pressure ratio region. For SRCC, isobutane has the best performance among three selected organic working fluids. The multi-parameter optimization result indicates that the IRCC has lower cycle efficiency comparing with SRCC, and SRCC shows the optimal performance among the four configurations. © 2021.The Japan Society of Mechanical Engineers.

关键词： Efficiency

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The concentration measurement of Biomass/Pulverized Coal/Air threephase flow based on electrostatic and capacitive method 6

The concentration measurement of Biomass/Pulverized Coal/Air...

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6th World Congress in Industrial Process Tomography

作者： Zhang, Juan Hu, Hongli Dong, Jun Zhang, Xiao Xu, Tongmo State Key Laboratory of Power Equipment and Electrical Insulation Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Power Engineering and Multiphase Flow Xi’an Jiaotong University Xi’an710049 China

ISBN: (纸本)9780853163220

A system for the phase concentration measurement of biomass/pulverized coal/air threephase flow based on electrostatic sensor and capacitive sensor data fusion in pneumatic conveying fuel system at {1. stations is developed. Because electrostatic sensor is more sensitive to dilute pulverized coal, while capacitive sensor to biomass, they are used in the measurement of biomass concentration and pulverized coal concentration in biomass/pulverized coal/air threephase flow. flow regimes are identified by HHT of the electrostatic sensor output signal. Under the certain flow regime identified, the dual regression analysis method is applied to work out the biomass concentration and the pulverized coal concentration. The experiment result indicates that the system has high linearity up to 5%. © 201., International Society for Industrial Process Tomography. All rights reserved.

关键词： Biomass

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Experimental study on mercury content in flue gas of coal-fired units based on laser-induced breakdown spectroscopy

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Plasma Science and Technology 2020年第7期22卷 75-82页

作者： Kai RONG Zhenzhen WANG Ruomu HU Renwei LIU Yoshihiro DEGUCH Junjie YAN Jiping LIU State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China Graduate School of Technology Industrial and Social SciencesTokushima UniversityTokushima 770-8501Japan Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China

Accurate measurement of trace heavy metal mercury(Hg) in flue gas of coal-fired units is great significance for ecological and environmental *** gas was used to simulate the actual flue gas of a power plant in this study.A laser-induced breakdown spectroscopy(LIBS)system for Hg measurement in mixed gas was built to study the effect of mixed gas pressure,Hg concentration in mixed gas and delay time on Hg *** experimental results show that the appropriate low mixed gas pressure can obtain high Hg signal intensity and signal to noise *** Hg signal intensity and signal to noise ratio increased with the increase of Hg concentration in mixed *** Hg signal intensity and signal to noise ratio decreased with the increase in delay *** to the above results,the optimized measurement conditions can be *** Hg concentrations in mixed gas were quantitatively analyzed by the internal standard method and traditional calibration method *** relative error of prediction of the test sample obtained by the internal standard method was within 1..1.%.The relative error of prediction of the traditional calibration method was less than 1..54%.This proved that the internal standard method can improve the accuracy of quantitative analysis of Hg concentration in flue gas using LIBS.

关键词： laser-induced breakdown spectroscopy flue gas trace heavy metal quantitative analysis

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Experimental investigation on separation characteristics of axial cyclone separator

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Science China(Technological Sciences) 2023年第11期66卷 3231-3244页

作者： WANG JinZhi WANG YeChun HAN JinZai XU Qiang XIE XiangDong PAN YingXiu GUO LieJin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Xinjin Weihua Institute of Clean Energy Research Foshan 528216China Aero Engine Corporation of China(AECC)Shenyang Engine Research Institute Shenyang 110015China

Axial cyclone separator has been widely applied in chemical production as an efficient gas-liquid separation *** this study,a new axial cyclone separator with integrated swirler and exhaust pipe is designed to achieve the development goal of compact structure for advanced engine,and the distribution characteristics of swirling flow patterns as well as the variation in separation characteristics are investigated under slug flow *** on flow visualizations and fluctuation characteristics of pressure signals,three typical flow patterns,namely,slug flow,swirling intermittent flow,and swirling annular flow,in the horizontal swirling separation flow are *** is investigated how the inlet conditions affect the separation characteristic *** separation purity and extreme points of the air separation efficiency are independent of the inlet liquid flow *** separation pressure drop is quadratically related to the inlet air flow *** on the drift-flux model and other methods,the prediction methods for the air separation efficiency and pressure drop are proposed,and the prediction accuracy is within±20%,which may provide instructions for the practical application of axial cyclone separator.

关键词： axial cyclone separation gas-liquid two-phase flow flow pattern in the swirling flow separation characteristics

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Preparation and characterization of ZnO/ZnS hybrid photocatalysts via microwave-hydrothermal method

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Frontiers of Environmental Science & engineering 2008年第4期2卷 415-420页

作者： Jinglian ZHAO Liang ZHAO Xinping WANG State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Physics and Astronomy Rice UniversityHoustonTX 77005-1657USA

The photocatalytic performance of ZnO/ZnS hybrid nanocomposite was largely higher than that of the mere ZnO or ZnS nanoparticles,but the complicated procedure and misdistribution of final products limited its large-scale *** exploration of a novel synthesis route of ZnO/ZnS hybrid photocatalysts with high catalytic performance is becoming a crucial step for the large-scale application of ZnO/ZnS hybrid photocatalytic *** and characterization of nanosized ZnO/ZnS hybrid photocatalysts were studied in this *** photocatalysts were obtained via microwavehydrothermal crystallization with the help of sodium *** products were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),particle size distribution(PSD),and Fourier transformed infrared spectroscopy(FT-IR).The results indicated that so-synthesized ZnO/ZnS samples consisted of the high pure cubic(sphalerite)ZnS and hexagonal ZnO nanocrystallines with a narrow particle size *** possible formation mechanisms of ZnO/ZnS nanocrystallines were mainly attributed to the superficially protective effect of *** photocatalytic experiments demonstrated that the ZnO/ZnS photocatalysts exhibited a higher catalytic activity for the degradation of acid fuchsine than other monocomponents.

关键词： photocatalyst ZnO/ZnS sodium citrate hydrothermal microwave

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Effect of ammonium ion on the corrosion behavior of Ni 2 FeCrMo 0.2 high-entropy alloy in simulated haze solution

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Journal of Materials Research and Technology 2025年

作者： Kai Wang Qilong Zhao Yanhui Li Ruidong Li Qipeng Xu State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi’an University of Technology No.5 Jinhua South Road Xi’an 710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an 710049 China School of Chemical Engineering Northwest University No.229 Taibai North Road Xi’an 710069 China

Various constituents of PM 2.5 in haze can accelerate metal corrosion, but traditional carbon steel and stainless steel perform poorly in such complex corrosive environments, and thus developing new corrosion-resistant materials are of great importance for mitigating haze-induced corrosion. The corrosion behavior of Ni 2 FeCrMo 0.2 alloy in haze-simulating aqueous solutions containing various constituents of PM 2.5 in haze is investigated. By the coupling analysis of electrochemical experiments, corrosion morphology, and corrosion product film, the influence of NH+ 4 concentration on the corrosion mechanism related to multi-principal metal elements is revealed. The results show that the Ni 2 FeCrMo 0.2 alloy exhibits superior corrosion resistance compared with 2205 duplex stainless steel. As the NH+ 4 concentration increases, the corrosion rate increases initially but then decreases at higher NH+ 4 concentrations, and the corrosion morphology also confirms this changing trend. The corrosion prompt is primarily due to the lower solution pH caused by the hydrolysis reaction of NH+ 4. In contrast, the corrosion inhibition at higher NH+ 4concentration is attributed to the passive film on the alloy surface, which is composed of Cr, Fe, Mo, Ni, and their oxides, with the presence of Mo elements forming a unique structure that improved the density and stability of the film, thereby inhibiting the growth of corrosion pits. The changing trend of corrosion film resistance and corrosion product film thickness agrees well with this change in corrosion rate. This study provides an insightful understanding of the corrosion behavior of multi-principal alloy materials in haze environments, which is crucial for the corrosion protection design of metal equipment materials.

关键词： Haze constituents Corrosion High entropy alloy Passive film

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