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CdS nanocrystallites sensitized ZnO nanorods with plasmon enhanced photoelectrochemical performance

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Chinese Chemical Letters 2019年第12期30卷 2363-2367页

作者： Li Cai Yuanchang Du Xiangjiu Guan Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering (MFPE) Xi’an Jiaotong University (XJTU)

A novel architecture of CdS/ZnO nanorods with plasmonic silver(Ag) nanoparticles deposited at the interface of ZnO nanorods and CdS nanocrystallites,was designed as a photoanode for solar hydrogen generation,with photocurrent density achieving 4.7 mA/cm^2 at 1.6 V(***),which is 8 and 1.7 times as high as those of pure ZnO and CdS/ZnO nanorod films,***,with optical absorption onset extended to^660 nm,CdS/Ag/ZnO nanorod film exhibits significantly increased incident photo-tocurrent efficiency(IPCE) in the whole optical absorption region,reaching 23.1% and 9.8% at 400 nm and500 nm,*** PEC enhancement can be attributed to the one-dimensional ZnO nanorod structure maintained for superior charge transfer,and the extended visible-light absorption of CdS ***,the incorporated plasmonic Ag nanoparticles could further promote the interfacial charge carrier transfer process and enhance the optical absorption ability,due to its excellent plasmon resonance effect.

关键词： ZnO nanorods Plasmonic Ag nanoparticles CdS nanocrystallites Photoelectrochemical water splitting Synergistic effect

Failure analysis of tube-burst on T91 platen superheater of 600 MW supercritical boiler

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Failure analysis of tube-burst on T91 platen superheater of ...

2020 International Conference on Artificial Intelligence and Electromechanical Automation, AIEA 2020

作者： Sun, Ke Wang, Jia'An Yan, Yu Jiang, Jiahao Deng, Lei State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'An Jiaotong University Xi'an710049 China China Huadian Electric Power Research Institute Co. Ltd. Hangzhou310030 China

ISBN: (纸本)9781728182889

In this paper, the specimen of the bursting tubes, original tube and oxide-like debris are analysed in-depth by macroscopic examination, chemical composition analysis, mechanical properties, metallographic examination, scanning electron microscopy and energy spectrum analysis etc.,. It shows that the main reason for the tube-burst is that the original oxide matters or time-original oxide matters blocks the tube, reducing the cooling effect of the steam, and resulting in a short-term overheating of the tube. It is recommended to control the internal cleanliness of boiler equipment and pipest. © 2020 IEEE.

关键词： Scanning electron microscopy

Neural network-based interface reconstruction algorithm for two-phase fluid flow

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Fundamental Research 2025年

作者： Gong, Junhua Chen, Yujie Yu, Bo Sun, Dongliang Wang, Bohong Shi, Guoyun Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China School of Petroleum Engineering Yangtze University Wuhan 430100 China National & Local Joint Engineering Research Center of Harbor Oil & Gas Storage and Transportation Technology/Zhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry Zhejiang Ocean University Zhoushan 316022 China Kunlun Digital Intelligence Technology Company Beijing 102266 China

In two-phase fluid flow, the vapor-liquid interface tends to behave as a curved shape under the influence of surface tension. Curve reconstruction favors improving the resolution of bubbles or droplets in numerical studies. Based on artificial neural network (ANN) and convolutional neural network (CNN), two curve reconstruction algorithms, namely CIR-ANN and CIR-CNN, are proposed in this study. Both algorithms can achieve high-precision prediction of the center and radius when reconstructing interfaces using a portion of a standard circle, especially for the CIR-CNN algorithm. A strict mass conservation strategy is also proposed to ensure the reliability of the neural network predictions. In comparison with interface reconstruction algorithms such as piecewise linear interface construction (PLIC) algorithm, efficient least squares volume-of-fluid interface reconstruction algorithm (ELVIRA), quadratic spline based interface (QUASI) reconstruction algorithm after the first interface correction, Circle-based Interface Reconstruction (CIR), and CIR-ANN algorithm, the proposed CIR-CNN demonstrates good advantages in static interface reconstruction, with average accuracy ratios of 48.40, 86.69, 26.34, 4.07 and 2.26. However, when capturing the bubble under a complex rotation and shear recovery flow field, the advantage of the proposed algorithms decreases due to the increased complexity of the fluid volume fraction distributions. Regarding the computational time cost of reconstructing random circular interfaces, the proposed algorithms achieve average reduction ratios of 4.16, 7.86, and 34.14, respectively, compared to the CIR, ELVIRA, and QUASI algorithms. © 2025

关键词： ANN CNN Curve reconstruction Neural network Two-phase flow

Effects of A‐Site Replacement (Sm, Y, and Pr) on Catalytic Performances of Mullite Catalysts for No Oxidation

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SSRN 2022年

作者： Chen, Lei Zhang, Chen Wu, Tiantian Huang, Boqiang Zhang, Jinping Guan, Guowei Zhang, Zaoxiao Hou, Xiaoke Hu, Chao Lu, Qiang School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'An710049 China School of Chemistry Xi'an Jiaotong University Xi'An710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'An China National Engineering Research Center of New Energy Power Generation North China Electric Power University Beijing China

Mullite is one of the most promising NO-SCO catalyst alternatives to the commercial Pt/Al 2 O 3 , and deciphering its intrinsic properties that affecting the catalytic performance is a great challenge but critical to the development of mullite catalysts. Herein, a series of Mn-based mullite nanofibers with different A‐site cations are synthesized by electrospinning method and used for catalytic NO oxidation. Activity tests show that SmMn 2 O 5 exhibits a better NO conversion rate (77.8%) than these of PrMn 2 O 5 (63.3%) and YMn 2 O 5 (57.5%) under typical experimental conditions ( GHSV=120 000 h -1 , T =325 °C ). To investigate the factors influencing the catalytic activity, various techniques including XRD, N 2 adsorption, SEM, TEM, EDX, XPS, H 2 -TPR and O 2 -TPR are employed, and the results show that abundant surface adsorbed oxygen species and good reducibility contribute greatly to the catalytic performance of SmMn 2 O 5 . DFT calculations revealed that A-site cation played the decisive role in the Fermi level relative to the Mn 3d-band centre, thus affecting the adsorption and dissociation of O 2 molecule. The present synthetic strategy offers a new viable route for the large-scale preparation of metal oxide catalysts with remarkable NO oxidation performance for practical application. © 2022, The Authors. All rights reserved.

关键词： Positive ions

Enhanced Hydrogen Production of Acidified La2nio4 in Water and Seawater by Coupled Piezo-Photocatalysis

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SSRN 2022年

作者： Ma, Xinyu Gao, Yangfei Yang, Bian Lou, Xiaojie Huang, Jianbing Ma, Lijing Jing, Dengwei International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an710049 China School of Materials Science and Engineering Xi’an University of Technology Xi’an710048 China

Photocatalytic water splitting for hydrogen production is more sustainable than traditional desalination and electrocatalysis, because of avoiding electrode corrosion and other problems. Two-dimensional perovskite oxide materials have multiple characteristics such as ferroelectric, piezoelectric and pyroelectric properties, demonstrating good light response and chemical stability, which provides a broad prospect in photo-chemical conversion. In this study, acidified La2NiO4 can greatly improve the amount of hydrogen evolution by coupling its piezocatalysis and photocatalysis. Under the full-spectrum illumination assisted with ultrasonic vibration in seawater, a recordable hydrogen production activity of 1315.44 μmol·g-1·h-1 was obtained in acidified La2NiO4 by 0.006 mol/L HCl, which more than 200 times higher than that of pure La2NiO4 (6.89 μmol·g-1·h-1) in methanol solution. It is found that the significant hydrogen production of La2NiO4 samples treated with acidification lies in the fast separation of charge carriers in comparison with those without acidification. © 2022, The Authors. All rights reserved.

关键词： Hydrogen production

Enhanced Hydrogen Production of Acidified Ruddlesden-Popper Type Perovskite Oxides in Water and Seawater by Coupled Piezo-Photocatalysis

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SSRN 2022年

作者： Ma, Xinyu Gao, Yangfei Yang, Bian Lou, Xiaojie Huang, Jianbing Ma, Lijing Jing, Dengwei International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi'An710049 China Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi'An710049 China School of Materials Science and Engineering Xi’an University of Technology Xi’an Xi'An710048 China

关键词： Hydrogen production

Modeling and prediction of ultrasonic attenuations in liquid-solid dispersions containing mixed particles with Monte Carlo method

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Particuology 2019年第2期17卷 84-91页

作者： Jianfei Gu Fengxian Fan Yunsi Li Huinan Yang Mingxu Su Xiaoshu Cai Institute of Particle and Two-Phase Flow Measurement/Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai 200093 China

We develop a theoretical model for predicting the ultrasonic attenuation in the liquid-solid system containing mixed particles. The ultrasonic attenuation coefficient is obtained by counting the number of phonons that reach the receiver. Using the Monte Carlo method (MCM), numerical simulations were performed to predict the ultrasonic attenuations with not only a single particle type but also monodisperse and polydisperse mixed particles. The simulation results for the systems with a single particle type were compared with various standard models. The results show that they agree well at relatively low particle volume concentrations (within 10%). For systems with mixed particles, the particle volume concentrati on was found to in crease to around 10%, and the variation of the ultrasonic attenuation agai nst the mixing ratio yields a nonlinear trend. Moreover, the ultrasonic attenuation is significantly affected by particle properties. The numerical results also show that both the particle type and particle size distribution should be carefully taken into account in the dispersions with polydisperse mixed particles, where the MCM can give a more direct description of the physics of sound propagation compared with the conventional models.

关键词： Ultrasound Ultrasonic attenuation Monte Carlo method Particle size measurement

Insight into the Interconversions of Three-Phase Products Through the Supercritical Water Gasification of Bark

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SSRN 2023年

作者： Ge, Hui Yi, Lei Huang, Yong Peng, Pai Cao, Wen Chen, Yunan Qi, Xingang Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'An710049 China International Institute for Innovation Jiangxi University of Science and Technology Jiangxi 341000 China Suzhou Academy Xi’an Jiaotong University No.99 Ren’ai Road Jiangsu Suzhou215123 China

The clean and efficient utilization of biomass waste for hydrogen production conforms to social development in the future. In this work, hydrogen production from supercritical water gasification (SCWG) of fir bark (FB) was investigated systematically at various reaction temperatures (500–750 °C), feedstock concentrations (5%–15%), and retention time (0–40 min). The gaseous, liquid, and solid products were analyzed comprehensively to determine the gasification mechanism. The results demonstrated that FB was the alternative feedstock for hydrogen production. The maximum CE and H2 selectivity of 95.34% and 0.99 were obtained at 700 °C-5%-40 min. High reaction temperature and prolonging retention time accelerated the conversions of phenolic compounds in liquid products and functional groups in solid products. High feedstock concentration also resulted in the bond-making between functional groups in solid products. The reaction mechanism was proposed based on the components of gaseous and liquid products and the variations of functional groups in solid products. © 2023, The Authors. All rights reserved.

关键词： Hydrogen production

Sacos-Plate: A New Thermal-Hydraulic Subchannel Analysis Code for Plate Type Fuel Assemblies

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SSRN 2023年

作者： Sun, Ruiyu Wang, Jianjun Wang, Jinshun Chen, Ronghua Jiang, Xing Tian, Wenxi Qiu, Suizheng Su, Guanghui Gui, Minyang Harbin Engineering University China School of Nuclear Science and Technology Xi’an Jiaotong University Shaanxi Xi’an710049 China Shaanxi Key Lab. of Advanced Nuclear Energy and Technology Xi’an Jiaotong University China State Key Lab. of Multiphase Flow in Power Engineering Xi’an Jiaotong University China Shanghai Nuclear Engineering Research Design Institute Shanghai China

Over the past few decades, plate-type fuel elements have been widely used in advanced research reactors, small modular pressurized water reactors, production reactors, etc., with the advantages of compact structure arrangement, good heat transfer characteristics and high fuel consumption. Currently, a thermal-hydraulic subchannel analysis code, namely SACOS-PLATE code, was newly designed to satisfy the calculation of different types of plate fuel elements under various steady-state operating conditions. Based on the original SACOS code, this updated version modifies the flow distribution model, the plate heat conduction model, the heat distribution model as well as the flow heat transfer model, and then realizes the simulation of the special thermal-hydraulic phenomena of the fuel and the rectangular flow channel. In this present study, the RA-6 experimental data was used to validate the code, and the simulation calculation was performed on the JRR-3 research reactor, which proved the good computing capability of SACOS-PLATE code. © 2023, The Authors. All rights reserved.

关键词： Plates (structural components)