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Science China Materials 2023年第2期66卷 603-613页

作者：卯连连邓豪李明涛沈少华 International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China

为了缓解氧化铁光阳极内部和表面的电荷复合,本文引入了一种界面电荷调控策略,利用界面内建电场(IEF)促进电荷的空间分离.水热生长的钛掺杂氧化铁(Hem)纳米棒通过简单的两步浸渍涂层过程,以石墨相氮化碳(g-C_(3)N_(4))和小的三氧化钼(Mo... 详细信息

为了缓解氧化铁光阳极内部和表面的电荷复合,本文引入了一种界面电荷调控策略,利用界面内建电场(IEF)促进电荷的空间分离.水热生长的钛掺杂氧化铁(Hem)纳米棒通过简单的两步浸渍涂层过程,以石墨相氮化碳(g-C_(3)N_(4))和小的三氧化钼(MoO_(3))团簇进行修饰.与原始的Hem相比,得到的Hem/C_(3)N_(4)/MoO_(3)表现出显著增强的光电化学分解水性能,相对于可逆氢电极,在1.23 V时,光阳极电流密度从0.3 mA cm^(-2)显著提高到1.6 mA cm^(-2),入射光子-电流转换效率在300 nm时达到18.4%.结果表明,在Hem/C_(3)N_(4)/MoO_(3)异质结中引入IEF是通过调控界面电荷特性实现的,此界面电荷特性是由Hem/C_(3)N_(4)界面的TypeⅡ能带排列和光阳极表面增强的能带弯曲所引起的,IEF能显著促进电荷的空间分离.研究这一界面电荷调控过程能为基于氧化铁的光阳极和其他半导体器件提供一种简单有效的策略,通过缓解载流子传输动力学的瓶颈,促进电荷的空间分离,实现高效的太阳能转换.

关键词：太阳能转换阳极电流密度半导体器件能带弯曲入射光子石墨相氮化碳载流子传输氢电极

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A novel synthetic method of porous and nanoflower-like Al_(2)O_(3)/MoS_(2)catalyst for reduction of SO_(2)to elemental sulfur

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Nano Research 2023年第5期16卷 6076-6084页

作者： Yiqian Yang Jiayuan Yu Yu Chen Gang Wang Chunshan Li Erqiang Wang Zhijian Peng School of Engineering and Technology China University of GeosciencesBeijing 100083China CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex SystemsBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

MoS_(2)nanoflowers are favored for their potential in the production of elemental sulfur due to abundant surface area and good catalytic performance for reducing SO_(2).A novel synthetic strategy of porous Al_(2)O_(3)supported on the MoS_(2)with nanoflower structure was *** effects of preparation concentration,calcination atmosphere,Al_(2)O_(3)contents on the growth of catalysts with nanoflower structure were systematically studied via X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),Fourier transform infrared(FTIR)spectroscopy,Brunauer–Emmett–Teller(BET).The surface area was increased to 295.502 m^(2)/g and the amount of Lewis acid on the surface of the Al_(2)O_(3)/MoS_(2)catalyst was increased by adjusting the ratio of Al/*** porous and nanoflower structures of Al_(2)O_(3)/MoS_(2)catalysts promoted the sulfur selectivity without inhibiting the catalytic performance of MoS_(2).The conversion of SO_(2)and the selectivity of sulfur were 100%and 92%after 100 h life evaluation.

关键词： porous catalyst nanoflower reduction of SO_(2) sulfur production hydrogen

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Data-Driven Surrogate Model for the Dynamic Characteristics of Supercritical Units

Data-Driven Surrogate Model for the Dynamic Characteristics ...

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2024 Boao New Power System International Forum - Power System and New Energy Technology Innovation Forum, NPSIF 2024

作者： Dong, Shuai Zheng, An Jiang, Junyao Gao, Wei Liu, Ming Huaneng Yimin Coal-Power Co. Ltd. Hulunbuir021130 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9798331504557

Coal-fired power generation units are characterized by large inertia, strong coupling, and high delay, making dynamic characteristic modeling inherently complex and computationally intensive. To address this, this paper utilizes GSE software to explore the dynamic characteristics of supercritical units. Data-driven approaches are then employed to develop surrogate model for these dynamics, comparing neural networks and support vector regression methods in the process. The study indicates that the surrogate model achieves a relative prediction error of less than 1% for live steam temperature, reheater steam outlet temperature, and power output. For live steam pressure and reheater steam outlet pressure, the model maintains a relative error within 10%. © 2024 IEEE.

关键词： Support vector regression

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Comparison of Dynamical System Scaling and Hierarchical Two-Tiered Scaling applications with Definite Solution Analogy Theory to the passive residual heat removal system of Fluoride-Salt-cooled high-Temperature Advanced Reactor 20

Comparison of Dynamical System Scaling and Hierarchical Two-...

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20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023

作者： Li, Xinyu Zhang, Dalin Zhou, Xingguang Lv, Xindi Jiang, Dianqiang Wu, Zhiyuan Li, Sijun Tian, Wenxi Qiu, Suizheng Su, G.H. 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 Xi'an710049 China

ISBN: (纸本)9780894487934

The Passive Residual Heat Removal System (PRHRS) of Fluoride-Salt-cooled high-Temperature Advanced Reactor (FuSTAR) has already been designed and scaled by the Hierarchical Two-Tiered Scaling (H2TS).However, considering the difficulties to identify the distortion of the dynamic response, the Dynamical System Scaling(DSS) method was also adopted for comparison in this ***, based on the dimensionless governing equations without any common assumptions of the natural cycle process in PRHRS, the Definite Solution Analogy Theory (DSAT) was put forward in this study to calibrate dimensionless numbers based on differential *** the parameters of geometric and thermohydraulics were re-evaluated by the DSS method and compared with those from the H2TS *** results show that H2TS and DSS are equivalent in experimental design results under the constraint of *** H2TS method is better at accurately quantifying the deviation item by item, while the DSS method can find the most suitable experimental structure more quickly. © 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.

关键词： Hierarchical systems

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利用三元合金保护和催化的硅光阳极与廉价硅太阳能电池相结合实现12.0%的太阳能制氢效率

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engineering 2023年第6期25卷 128-137,M0006页

作者：何凌云洪欣王亦清邢众航耿嘉峰郭鹏慧苏进展沈少华 International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China

n型硅(n-Si)表面在水溶液中容易被氧化和钝化,导致其在光电化学(PEC)分解水的析氧反应(OER)动力学缓慢。本工作通过欠电位沉积成功地在p^(+)n-Si基底上电沉积了三金属Ni_(0.9)Fe_(0.05)Co_(0.05)保护层。制备的Ni_(0.9)Fe_(0.05)Co_(0.0... 详细信息

n型硅(n-Si)表面在水溶液中容易被氧化和钝化,导致其在光电化学(PEC)分解水的析氧反应(OER)动力学缓慢。本工作通过欠电位沉积成功地在p^(+)n-Si基底上电沉积了三金属Ni_(0.9)Fe_(0.05)Co_(0.05)保护层。制备的Ni_(0.9)Fe_(0.05)Co_(0.05)/p^(+)n-Si光阳极具有优异的稳定性和PEC水氧化活性,具有相对低的OER起始电位(相对于可逆氢电极电势(RHE)仅为0.938 V),并且在1.23 V ***电位时具有较高的光电流密度(33.1 m A·cm^(-2)),显著优于Ni/p^(+)n-Si光阳极。工作证明了Fe在Ni层的掺杂会在Ni_(0.9)Fe_(0.05)Co_(0.05)/p^(+)n-Si界面处产生较大的能带弯曲,促进界面电荷分离。此外,Co的加入会产生丰富的Ni^(3+)和氧空位(Ov),作为活性位点可以加速OER动力学过程,协同促进PEC过程中的水氧化的活性。令人鼓舞的是,通过将Ni_(0.9)Fe_(0.05)Co_(0.05)/p^(+)n-Si光阳极连接到廉价的硅太阳能电池上,所制备的集成光伏/PEC(PV/PEC)器件实现了无偏压下高达12.0%的太阳制氢能量转换效率。这项工作提供了一种简单的方法来设计高效、稳定的n-Si基光阳极,并对其构效关系有了深刻的理解;这种方法制备的材料在集成低成本PV/PEC器件用于无辅助太阳能驱动水分解方面具有巨大的潜力。

关键词：欠电位沉积电极电势阳极连接硅太阳能电池能量转换效率太阳能制氢能带弯曲光阳极

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Boosting electrochemical reduction of CO_(2)to CO using molecule-regulated Ag nanoparticle in ionic liquids

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Green Energy & Environment 2025年第4期10卷 813-820页

作者： Fangfang Li Kuilin Peng Chongyang Jiang Shaojuan Zeng Xiangping Zhang Xiaoyan Ji Energy Engineering Division of Energy ScienceLuleåUniversity of TechnologyLuleå97187Sweden Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China College of Chemical Engineering and Environment China University of PetroleumBeijing102249China

Electrochemical reduction of CO_(2)is a promising approach to convert CO_(2)to high-valued chemicals and ***,developing efficient electrocatalysts featuring desirable activity and selectivity is still a big *** this work,a strategy of introducing functionalized molecules with desirable CO_(2)affinity to regulate Ag catalyst for promoting electrochemical reduction of CO_(2)was ***,3-mercapto-1,2,4-triazole was introduced onto the Ag nanoparticle(Ag-m-Triz)for the first time to achieve selectively converting CO_(2)to carbon monoxide(CO).This Ag-m-Triz exhibits excellent performance for CO_(2)reduction with a high CO Faradaic efficiency(FECO)of 99.2%and CO partial current density of 85.0 mA cm^(-2)at-2.3 V ***/Ag^(+) in H-cell when combined with the ionic liquid-based electrolyte,30 wt%1-butyl-3-methylimidazolium hexafluorophosphate([Bmim][PF6])-65 wt%acetonitrile(AcN)-5 wt%H2O,which is 2.5-fold higher than the current density in Ag-powder under the same *** studies confirm that the significantly improved performance of Ag-m-Triz originates from(i)the stronger adsorption ability of CO_(2)molecule and(ii)the weaker binding energy to form the COOH*intermediate on the surface of Ag-m-Triz compared with the Ag-powder catalyst,which boosts the conversion of CO_(2)to *** research provides a facile way to regulate electrocatalysts for efficient CO_(2)reduction by introducing functionalized molecules.

关键词： CO_(2)reduction CO Electrochemical Molecule-regulated Silver Ionic liquid

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Energy budget of cold and hot gas-solid fluidized beds through CFD-DEM simulations

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Particuology 2024年第6期89卷 153-171页

作者： Lei Bi Yunpeng Jiao Chunjiang Liu Jianhua Chen Wei Ge School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Direct energy budget is carried out for both cold and hot flow in gas–solid fluidization ***,the energy paths are proposed from thermodynamic *** consumption means total power input to the specific system,and it can be decomposed into energy retention and energy *** retention is the variation of accumulated mechanical energy in the system,and energy dissipation is the energy converted to heat by irreversible *** based on the Computational Fluid Dynamics-Discrete Element Method(CFD-DEM)framework,different energy terms are quantified from the specific flow elements of fluid cells and particles as well as their interactions with the *** order to clarify the energy budget,it is important to identify which system is studied:the particle-fluid system or the particle *** the cold flow,the total energy consumption of the particle sub-system can well indicate the onset of bubbling and turbulent,while the variation of local energy consumption terms can reflect the evolution of heterogeneous *** the hot flow,different heat transfer mechanisms are analyzed and the solver is modified to reproduce the experimental *** impact of the heat transfer mechanisms and heat production on energy consumption is also *** proposed budget method has proven to be energy-conservative and easy to conduct,and it is hopeful to be applied to other multiphase flow systems.

关键词： Energy budget Gas-solid fluidization CFD-DEM Regime transition Heat transfer mechanism

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Influence of active and passive equipment for advanced pressurized water reactor on thermal hydraulic and source term behavior in severe accidents

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Energy Storage and Saving 2023年第1期2卷 392-402页

作者： Jishen Li Bin Zhang School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China

Extensive studies have been carried out on the behavior of core degradation and fission products of common pressurized water reactors(PWRs).However,few of them have investigated the relationship between thermal hydraulic and fission product behavior in advanced passive *** to the impact of thermal hydraulic be-haviors in different accident sequences on the release and transportation of fission products,an integrated severe accident analysis(ISAA)code with highly coupled thermal hydraulic and source term calculations is required to simultaneously analyze thermal hydraulic and source term *** advanced passive PWRs,important safety systems that may affect the behavior of the core and fission products should be *** is therefore necessary to simulate the thermal hydraulic and fission product behavior of advanced passive *** this study,the ISAA code is adopted to simulate the occurrence of a hypothetical double ended cold leg LBLOCA of HPR1000 in three scenarios of equipment *** results show that the high-temperature fuel rods and cladding ma-terials exhibit delayed failure at the lower position of the active core,whereas earlier failure at higher position during the *** and passive equipment affects fuel temperature,the oxidation conditions of the fuel,the interaction of fission products and structural materials,and the state of the fuel,thereby affecting the release of fission products in the ***1000 only relies on passive equipment to relieve the core degradation in severe accidents,realize the in-vessel retention of melt,and eliminate the ex-vessel release possibility of fission *** is hoped that the results can provide references for HPR1000 to formulate the severe accident management guidelines(SAMG).

关键词： Nuclear safety LBLOCA Severe accident Source term HPR1000 Active and passive equipment

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Experimental investigation on the gravity driven discharge of cohesive particles from a silo with two outlets

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Particuology 2024年第6期89卷 11-21页

作者： Li Dai Zhulin Yuan Fengxian Fan Conghui Gu School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212100China

An experimental study on the gravity driven discharge of cohesive particles from a silo with two outlets was *** discharge behaviors under the conditions that a single outlet was open and two outlets were open were investigated by varying the moisture content of the particles and the filling height of the particles in the *** results show that the discharge rate of the cohesive particles increases gradually at the beginning,then almost keeps constant,and finally drops *** discharge rate in case of two openings is around 1.1–1.6 times that in case of a single *** filling height leads to lower discharge rate in case of a single opening but results in higher discharge rate in case of two ***,the avalanche dynamics in case of a single opening was examined,and the mixing behavior of the cohesive particles was *** is observed that the discharge flow is promoted by the avalanche phenomenon in the silo,generating a general trend that the normalized mass of discharge increases with the filling height at higher moisture *** case of a single opening,the transition from mass flow to funnel flow favors the particle mixing,resulting in an increasing mixing index as the moisture content *** general,a better performance of mixing can be achieved in case of a single opening compared with in case of two *** study provides vital information for fundamental understanding of the gravity driven discharge of cohesive particles from the silo with multiple outlets.

关键词： Cohesive particles Moisture content Discharge rate Avalanche Mixing

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Fluidization thermal decomposition of sodium fluosilicate

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Chinese Journal of Chemical engineering 2023年第5期57卷 329-337页

作者： Feng Pan Sugang Ma Yu Ge Chuanlin Fan Qingshan Zhu State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences(CAS)Beijing 100190China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

To break through the thermodynamic limitation that sodium fluosilicate only can be completely decomposed at high temperature,the technology of pre-decomposition under SiF_(4) atmosphere and deep decomposition under air condition at lower temperature was *** hydrolysis reaction of sodium fluosilicate can be effectively restrained when drying under vacuum or low *** decomposition results of sodium fluosilicate indicate that temperature has a very significant effect on its *** decomposition ratio can reach 79.4%at 600℃ for 1 h,and 99.6% at 700℃ for 1 h under air condition,*** velocity and the type of inert gas have no significant effect on its *** particles affect its decomposition performance due to agglomeration,while coarse particles have good thermal decomposition performance without significant *** decomposition reaction process in fluidized bed satisfies the classical Avrami Erofe'EV model,with the reaction order of 1.5 and the activation energy of 61.35 kJ·mol^(-1).

关键词： Sodium hexafluorosilicate Preparation Silicon tetrafluoride Absorption Fluidized bed

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