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Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

Journal of Energy Chemistry 2025年第01期 385-396页

作者： Mingming Zhang Hanyu Wu qi chen Jiaxin Yang Bonan Liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of NH3/O2and the production of N2/H2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of NH3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for OH and O（1S）.However,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

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Kinetic roles of vibrational excitation in RF plasma assisted methane pyrolysis

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Journal of Energy Chemistry 2019年第12期28卷 188-197页

作者： Jintao Sun qi chen School of Mechanical Electronic and Control Engineering Beijing Jiaotong University

A combined experimental and simulational work was carried out in this paper to investigate the kinetic effects of non-equilibrium excitation by direct electron impact on low temperature pyrolysis of CH4 in a RF dielectric barrier *** attention was placed on the vibrational chemistry of CH4 and some other important products including H2,C2H2,C2H4,C2H6 and C3H8 largely produced in CH4/He discharge under an intermediate reduced electric field ranging 51-80 Td.A detailed kinetic mechanism incorporating a set of electron impact reactions,electron-ion recombination reactions,negative ions attachment reactions,charge exchange reactions,reactions involving vibrationally excited molecules and the relaxation process of vibrationally excited species was assembled and experimentally *** modeling results showed a reasonable agreement with the experimentally measured results in terms of CH4 conversion and products production including C2 hydrocarbons and hydrogen.A linear increasing trend of methane conversion with increasing plasma power input was discovered,which suggested a strong dependence of molecular excitation on energy *** the CH4/He mole ratio and the reactor temperature play significant roles in CH4 conversion and major products *** experimental results showed that the selectivity of value-added products C2H4 and H2 keeps essentially unchanged with increasing energy input,mostly because the contribution CH4 ionization and He excitation effectively compete with vibrational excitation and dissociation of CH4 molecule with the E/N value *** calculated results showed that the typical relaxation time of vibrational states is comparable to the gas-kinetics time in a CH4/He discharge mixture,thus the vibrationally excited molecules can significantly accelerate chemical reactions through an effective decrease of activation *** path flux analysis revealed that the vibrationally excited molecules CH4(v)and H2(v)enhanced

关键词： Non-equilibrium plasma Methane pyrolysis Vibrational excitation Path flux analysis Sensitivity analysis

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Improving intrinsic stability for perovskite/silicon tandem solar cells

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 85-105页

作者： Tailai Xu Yihua chen qi chen School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China

Monolithic hybrid halide perovskite/crystalline silicon(c-Si)tandem solar cells have demonstrated their great potential to surpass the theoretical efficiency limit of single-junction ***,the stability of perovskite sub-cells is inferior to that of the c-Si solar cells that have been commercialized,casting serious doubt about the lifetime of the entire *** device operation,light and heat are inevitable,which requires special ***,we review the current understandings of the intrinsic stability of perovskite/c-Si tandems upon light and/or heat ***,we summarize the recent understandings regarding light facilitated ion migration,materials decomposition,and phase *** addition,the reverse bias effect on the stability of tandem modules caused by uneven illumination is ***,this review also summarizes the thermalinduced degradation and mismatch issue,which underlines the system design of perovskite/c-Si ***,recent strategies to improve the intrinsic stability of perovskite/c-Si tandems under light and/or heat are reviewed,such as composition engineering,crystallinity enhancement,interface modification,material optimization,and device structure *** last,we present several potential research directions that have been overlooked,and hope those are helpful for future research on perovskite based tandem solar cells.

关键词： perovskite c-Si tandem solar cell light stability thermal stability photovoltaic module

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MOFs in Emerging Solar Cells

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Chinese Journal of Chemistry 2023年第6期41卷 695-709页

作者： Jie Dou qi chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Centerof Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing100081China Bejing Instituteof Technology Chongqing Innovation Center Chongqing 404100China

Metal-organic framework(MOF)materials have attracted intense scientific interest in the solar cell research community owing to their unique physiochemical properties and various preparation *** photovoltaic performance and stability of resultant optoelectronic devices can also be improved by adopting MOF *** review pays close attention to the summary and generalization of recent representative achievements in solar cells by utilizing MOFs,including dye-sensitized solar cells,perovskite solar cells,organic solar cells,and so on.

关键词： MOFs Synthetic methods Solar cells Photochemistry Sustainable chemistry Green chemistry

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Zinc Stannate Nanostructures for Energy Conversion

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Chinese Journal of Chemistry 2021年第2期39卷 367-380页

作者： Jie Dou qi chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing100081 China Beijing Institute of Technology Chongqing Innovation Center Chongqing 4004100Beijing100081 China

To date,ternary metal oxide semiconductor materials have attracted extensive attention worldwide due to their unique optoelectronic *** a classical ternary oxide,Zn2SnO4 is featured with the high electron mobility,wide band gap,negligible visible light absorption and tailorable electronic band ***,it is an ideal material for practical use in solar cells,lithium batteries,sensors,and *** this review,we summarize the recent research progress of this material with the focus on the synthesis methods,nanostructures,and the resulting effects on the crystal structure,optical properties,and photoelectrochemical ***,their potential applications in different devices are highlighted and carefully discussed.

关键词： Zinc stannate Synthesis design Nanostructures Applications Energy conversion

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Dilatometric Investigation on Isothermal Transformation after Hot Deformation

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Journal of Iron and Steel Research International 2003年第4期10卷 46-48页

作者： chen Ying chen qi-an Central Iron and Steel Research Institute

The method of liquid solid roll bonding to produce bush material was described and used for producing a new bush material AlSn 8Si 2 5 Pb 2Cu 0 8 Cr 0 2 . The results show that the aluminum alloy solidifies so fast during the process of liquid solid roll bonding that the microstructure of alloy is made up of fine dendrite. The distributions of tin, silicon, lead, copper and chromium are uniform and dispersive, and the diffusion layer between aluminum alloy and steel is jagged. The stripped surface of steel is accompanied with matrix aluminum alloy, and the bonding strength of the interface between steel and aluminum alloy is near the strength of the matrix aluminum alloy.

关键词： advanced bush strip liquid solid roll bonding bonding strength

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Overview of deep structures under the Changbaishan volcanic area in Northeast China

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Science China Earth Sciences 2019年第6期62卷 935-952页

作者： qi-Fu chen Yinshuang AI Yun chen Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Institutions of Earth Science Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences

The Changbaishan volcano is an active and considerably hazardous volcano located on the border of China and North Korea. This paper summarizes a series of geophysical surveys as well as seismological and volcano-observational networks around the Changbaishan volcanic area. We characterize deep structures related to the Changbaishan volcanic area. The prominent low-velocity anomalies and low-resistance bodies associated with the magma system under the Changbaishan volcano were detected in the crust and upper mantle, and high-velocity anomalies were imaged within the mantle transition zone,suggesting that the origin of the Changbaishan volcano is related to the subducted Pacific slab. However, there exist a few major obstacles for comprehensively elucidating the deep structure of the Changbaishan volcano as well as for the preparedness for and response toward future volcanic unrest and activity. It is essential to collect data from both China and Korean Peninsula to image the deep structure beneath the Changbaishan volcanic area. A multi-disciplinary approach comprising seismological investigations, deformation information from GNSS and InSar, and gravity and magnetotelluric surveying is a reliable manner for imaging high-resolution structures and fluid movement for the spatial distribution and variation of the volcanic magma *** effective volcano-monitoring network system is considerably important to improve hazard assessments and characterize the potential future eruption of the Changbaishan volcano.

关键词： Changbaishan volcano Deep structure Geophysical observation

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Evaluation of 3D crustal seismic velocity models in southwest China:Model performance,limitation,and prospects

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Science China Earth Sciences 2024年第2期67卷 604-619页

作者： Xin WANG Ling chen qi-Fu chen Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China

Southwest China is a tectonically and seismically active region,witnessing strong deformation due to the collision between the Indian and Eurasian *** the subsurface velocity structure of this region is thus important in understanding the tectonics and geodynamic processes of continental collision and in mitigating seismic *** studies have provided various 3D seismic velocity models in southwest ***,discrepancies exist among these models,and less effort has been made to quantify the reliability and accuracy of these existing velocity *** this study,we use regional 3D waveform simulation to evaluate the performance of various regional crustal 3D velocity models in reproducing observed *** particularly focus on two recent earthquake sequence in the region,the 2021 Yunnan Yangbi MS_(6.4) earthquake sequence and the 2022 Sichuan Luding MS_(6.8) earthquake *** tested 3D velocity models include the Southwest China Community Velocity model V1.0,the Unified Seismic Tomography Models for Continental China Lithosphere V2.0,the adjoint full waveform tomography model of the crustal and upper mantle beneath Eastern Tibetan Plateau,and the shallow seismic structure model beneath continental *** results show that the tested 3D velocity models generally capture well long-period(<0.2 Hz)waveforms,indicating that the 3D models adequately resolve overall large-scale subsurface ***,the 3D synthetics show discrepancies in higher frequencies(0.05–0.3 Hz)and the performance of the 3D velocity models varies from region to region,suggesting that smaller scale heterogeneities are not well *** shallow velocity structures(<10 km)can improve the waveform fitting,emphasizing the importance of incorporating shallow structures in waveform *** full-waveform tomography model shows a slighter better performance than the other models,especially for the body-waves,highlighting the advantages

关键词： Southwest China Seismic tomography models Shallow Structures Waveform simulation Model evaluation

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Simulation of thermoacoustic waves by a pressure-based algorithm for compressible flows

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Acta Mechanica Sinica 2012年第3期28卷 819-824页

作者： Wei Li qi-Sheng chen Key laboratory of Microgravity Institute of MechanicsChinese Academy of Sciences15 Beisihuan West Road100190 BeijingChina

A modified SIMPLEC method which can solve compressible flows at low Mach number is introduced and used to study thermoacoustic waves induced by a rapid change of temperature at a solid wall and alternating- direction flows generated by thermoacoustic effects in a ta- pered resonator. The results indicate that the algorithm adopted in this paper can be used for calculating com- pressible flows and thermoacoustic waves. It is found that the pressure and velocity in the resonator behave as stand- ing waves, and the tapered resonator can suppress high- frequency harmonic waves as observed in a cylindrical res- onator.

关键词： Compressible flow Thermoacoustic wave Resonator. SIMPLEC

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Synthesis of Star Polymeric Ionic Liquids and Use as the Stabilizers for High Internal Phase Emulsions

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Chinese Journal of Polymer Science 2017年第1期35卷 54-65页

作者： qi-jing chen 安泽胜 Institute of Nanochemistry and Nanobiology College of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China

A series of well-defined core cross-linked star （CCS） polymeric ionic liquids （PILs） were synthesized via a three- step approach. First, the styrenic imidazole-based CCS polymer （S-PVBnIm） was prepared by the RAFT-mediated heterogeneous polymerization in a water/ethanol solution, followed by the quaternization of S-PVBnIm with bromoalkanes and anion exchange. The CCS polymers were characterized by gel permeation chromatography （GPC）, nuclear magnetic resonance （NMR） spectroscopy, Fourier transform infrared spectroscopy （FTIR）, thermal gravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The obtained CCS polymers were used as the effective emulsifiers for oil-in-water high internal phase emulsions （HIPEs）. Multiple oils with different polarity including n-dodecane, undecanol, toluene and octanol were emulsified using 0.5 wt% S-PVBnIm aqueous solution under the acidic condition to form HIPEs with long-term stabilities. The excellent emulsification properties of CCS PILs were demonstrated by HIPE formation for a variety of oils. The properties of HIPEs in terms of emulsion type and oil droplet size were characterized by the confocal laser scanning microscopy （CLSM）. The intriguing capability of CCS PILs to stabilize HIPEs of various oils holds great potentials for the practical applications.

关键词： Star polymers Poly(ionic liquids) Emulsions

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