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Surface Adsorbed Hydroxyl: A Double-Edged Sword in Electrochemical CO2Reduction over Oxide-Derived Copper

Angewandte Chemie 2023年第31期135卷

作者： Daixing Wei Yiqing Wang Prof. Chung-Li Dong Ta Thi Thuy Nga Yuchuan Shi Jialin Wang Xiaoli Zhao Prof. Fan Dong Prof. Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Physics Tamkang University New Taipei City 25137 Taiwan Research Center for Environmental and Energy Catalysis Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China

Oxide-derived Cu (OD−Cu) featured with surface located sub-20 nm nanoparticles (NPs) created via surface structure reconstruction was developed for electrochemical CO 2 reduction (ECO 2 RR). With surface adsorbed hydroxyls (OH ad ) identified during ECO 2 RR, it is realized that OH ad , sterically confined and adsorbed at OD−Cu by surface located sub-20 nm NPs, should be determinative to the multi-carbon (C 2 ) product selectivity. In situ spectral investigations and theoretical calculations reveal that OH ad favors the adsorption of low-frequency *CO with weak C≡O bonds and strengthens the *CO binding at OD−Cu surface, promoting *CO dimerization and then selective C 2 production. However, excessive OH ad would inhibit selective C 2 production by occupying active sites and facilitating competitive H 2 evolution. In a flow cell, stable C 2 production with high selectivity of ∼60 % at −200 mA cm −2 could be achieved over OD−Cu, with adsorption of OH ad well steered in the fast flowing electrolyte.

关键词： CO2 Reduction Electrochemistry Oxide-Derived Copper Reaction Mechanisms Surface Adsorbed Hydroxyls

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Study on ash fusion behaviors and physico-chemical characteristics of semi-coke and its blended fuel with coal 35

Study on ash fusion behaviors and physico-chemical character...

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35th Annual International Pittsburgh Coal Conference, PCC 2018

作者： Yuan, Maobo Wang, Chang'an Wang, Pengqian Tao, Zichen Du, Yongbo Zhao, Lei Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China

ISBN: (纸本)1890977357

With the rapid development of coal chemical industry in China, a large number of low-volatile carbon-based fuels such as semi-coke are in urgent need of combustion and utilization, and the co-combustion with high-volatile coal shows the potential to realize the large-scale utilization of semi-coke in coal-fired power plant. Because the blending coal can hardly match the design coal, it is easy to aggravate the degree of deposition and slagging on the heating surface and affect the operation of the boiler. However, the melting behavior of ash produced by blended coal with semi-coke combustion needs further study. In this paper, the ash melting behavior and physico-chemical characteristics of semi-coke and its blended fuel with coal were experimentally studied. Firstly, the relation of ash composition and ash melting behavior was observed by comparing the ash composition and ash fusion point of semi-coke and raw coal. Secondly, the influence of blending ratio and blending mode on the ash melting behavior of semi-coke blended fuel was studied by micro-computer ash melting point meter. Finally, the microstructure and physico-chemical properties of the melted ash at the softening temperature were evaluated by scanning electron microscope (SEM) technique with X-ray spectrometer (EDS) and X-ray diffractometer (XRD) technique. The experimental results showed that the mineral composition and oxide content in the semi-coke were different from the raw coal, which led to the change of coal ash fusibility. Meanwhile, the ash fusion point of semi-coke blended fuel could not be expressed linearly by the ash fusion point of its raw coal, and the influence of blending mode including in-furnace blending and out-furnace blending on the ash fusion point could be neglected. While the microstructure and physico-chemical properties were affected by the blending mode. Compared to the in-furnace blending, the carbon content was lower in out-furnace blending. Furthermore, the blending mode h

关键词： Coal

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Cover Image, Volume 4, Number 1, January 2022

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Carbon Energy 2022年第1期4卷

作者： Chengyong Shu Qiang Tan Chengwei Deng Wei Du Zhuofan Gan Yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong Yang Xiaohua Yang Yuping Wu School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an China State Key Laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi'an Jiaotong University Xi'an China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power Sources Shanghai China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Xiao-dong Yang College of Materials Science and Engineering Huaqiao University 361021 Xiamen China. Xiaohua Yang Institute of Quantum and Sustainable Technology (IQST) School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China. Yuping Wu State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced Materials Nanjing Tech University 211800 Nanjing China. College of Materials Science and Engineering Huaqiao University Xiamen China Institute of Quantum and Sustainable Technology (IQST) School of Chemistry and Chemical Engineering Jiangsu University Zhenjiang China State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced Materials Nanjing Tech University Nanjing China

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Numerical simulation on filling process of drag reduction agent in natural gas pipeline

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Journal of Physics: Conference Series 2021年第1期1985卷

作者： Xiaoyun Yin Jiaqiang Jing Peiyu Jing Jie Sun Ying Yuan School of Oil & Natural Gas Engineering Southwest Petroleum University Chengdu China Oil & Gas Fire Protection Key Laboratory of Sichuan Province Chengdu China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

In this paper, a numerical simulation is established to model the filling process of atomized natural gas drag reduction agent (DRA) at the pipeline inlet section. The computations are on the basis of the Euler-Lagrange method with the standard k-ε turbulence model. The effects of atomizing parameters on the droplets Sauter Mean Diameter (SMD) and the adsorption performance on the wall of pipe are investigated using the validated model. The results show that nozzle diameter and nozzle angle have little effect on the SMD of DRA droplets, whereas the size of the droplets SMD reduces with the increase of atomizing pressure, and the influence of atomizing flow rate is just the opposite.

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MXene-derived Ni/TiO2-x/Ti3C2 catalyst for enhanced photothermal CO2 methanation: Unraveling the roles of photoexcited carriers

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Chemical engineering Journal 2025年 515卷

作者： Sun, Fan Xin, Yu Xing, Xueli Lou, Jiahui Wang, Qiliang Hong, Hui International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China School of Aeronautics and Astronautics University of Chinese Academy of Sciences Beijing100049 China Huaneng Clean Energy Research Institute Beijing102209 China Shandong Institute of Advanced Technology Jinan250100 China Department of Architecture and Built Environment University of Nottingham NottinghamNG7 2RD United Kingdom

Photothermal catalysis has emerged as a promising approach for CO2 conversion, which combines photo and thermal energy to drive catalytic reactions efficiently. While light can lower activation barriers and enhance reaction rates, the interplay between light and heat within the catalytic framework remains largely unexplored. In this study, we investigate the critical role of photogenerated carriers in enhancing catalytic performance under solar irradiation, unraveling their contribution to the CO2-to-CH4 conversion process. A multilayer accordion-like Ni/TiO2-x/Ti3C2 catalyst, which exhibits excellent photothermal and photoelectric response characteristics was fabricated for efficient photothermal CO2 methanation. Experimental results demonstrated that introduction of light during thermal catalysis markedly enhanced the CO2 conversion rate, with a 55 % increase achieved at 548 K. Furthermore, the required temperature for maximum CO2 conversion rate was reduced by 50 K compared to the thermal-driven process. Meanwhile, the effects of concentrated ratio and incident wavelength on CO2 conversion were also examined, revealing a synergistic effect between photogenerated carriers and thermal energy. Further characterizations, including steady-state and transient photoluminescence spectroscopy, in-situ XPS, in-situ EPR, in-situ DRITFs, were employed to elucidate the enhancement mechanisms of photogenerated carriers in the catalytic reaction. At the same time, an outdoor experimental prototype was developed to verify the feasibility of photogenerated carrier-thermal synergistically driven CO2 methanation. Our findings provide valuable insights into the role of photo-generated carriers in photothermal CO2 methanation, offering new perspectives for the design of efficient photothermal catalysts and advancing solar catalytic CO2 conversion technologies. © 2025

关键词： Activation energy

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Heat transfer characteristics in super-low finned-tube bundles of moisture separator reheaters

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Nuclear engineering and Design 2019年 341卷 368-376页

作者： Dalin Zhang Jiangtao Yu Wenxi Tian G.H. Su Suizheng Qiu State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University No. 28 Xianning West Road Xi’an 710049 China

Experimental investigation on the heat transfer characteristics of superheat vapor through a new designed moisture separator reheater with “super-low” finned-tube bundles for Generation III+ nuclear power plant, was carried out based on a 5*30 tube bundle test section. Impacts of the vapor mass flow rates are analyzed on the heat transfer characteristics of superheat vapor through the finned-tube bundle. A group of experiments are reviewed on single-phase fluid flowing across the triangular super-low finned-tube bundles whose fin heights are less than 2.75 mm and ratios of fin height to fin diameter are from 0.05 to 0.15. Combining the presented experimental data with the other open published data for single-phase turbulent gases flowing across triangular super-low finned-tube, a new heat transfer correlation is proposed for the MSRs super-low finned-tube bundles, which shows better accuracy and has wider Reynolds number range in application.

关键词： Super-low finned-tube bundle Moisture separator reheater Superheated vapor Heat transfer

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

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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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Retraction notice to “Exploration over combined impacts of modified piston bowl geometry and tert-butyl hydroquinone additive-included biodiesel/diesel blend on” [FUEL 322C (2002) 124206]

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Fuel 2025年 384卷

作者： Krupakaran Radhakrishnan Lawrence Zuohua Huang Xuan Phuong Nguyen Dhinesh Balasubramanian Vidyasagar Reddy Gangula Raghurami Reddy Doddipalli Van Vang Le Sachuthananthan Bharathy Anh Tuan Hoang Department of Mechanical Engineering Sree Vidyanikethan Engineering College Tirupati Andhra Pradesh India State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China PATET Research Group Ho Chi Minh City University of Transport Ho Chi Minh City Viet Nam Department of Mechanical Engineering Mepco Schlenk Engineering College Sivakasi India Mechanical Engineering Faculty of Engineering Khon Kaen University Khon Kaen Thailand Center for Alternative Energy Research and Development Khon Kaen University Khon Kaen Thailand Institute of Maritime Ho Chi Minh City University of Transport Ho Chi Minh City Viet Nam Institute of Engineering HUTECH University Ho Chi Minh City Viet Nam

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Revealing the unexpected promotion effect of EuO_x on Pt/CeO_2 catalysts for catalytic combustion of toluene

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Chinese Journal of Catalysis 2019年第4期40卷 543-552,M0003页

作者： Baoming Zhao Yanfei Jian Zeyu Jiang Chi He Xi’an Modern Chemistry Research Institute Xi’an 710065ShaanxiChina State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina Department of Chemistry College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Saudi Arabia National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of SciencesBeijing 101408China

Pt/Eu2O3-CeO2 materials with different Eu concentrations were prepared and applied to toluene destruction,and the remarkable promotion impact of EuOx on Pt/CeO2 can be *** characterization results reveal that the presence of EuOx significantly enhances the redox property,lattice O concentration,and Ce3+ ratio of the Pt/CeO2 material,which facilitates the dispersion and activity of Pt active sites and thus accelerates the decomposition process of *** all catalysts,a sample with an Eu content of 2.5 at.%(Pt/EC-2.5)possesses the best catalytic activity with 0.09 vol% of toluene completely destructed at 200 ℃ under a relatively high GHSV of 50000 h^-*** possible reaction pathway and mechanism of toluene combustion over Pt/Eu2O3-CeO2 samples are presented according to in-situ DRIFTS,which confirms that the toluene oxidation process obeys the Mars-van Krevelen mechanism with aldehydes and ketones as primary organic intermediates.

关键词： Pt/Eu2O3-CeO2 material Promotion effect Toluene Catalytic oxidation In-situ DRIFTS Reaction mechanism

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