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Elucidation of the last steps of photo-ammonification:analytical method development and mechanism elucidation

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 101-106页

作者： Yingjing Miao Hui Wang chunpeng yang Ruochun Zhang Hao Zhang Peizhe Sun School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China School of Earth System Science Tianjin UniversityTianjin 300072China

The mechanisms underlying the photo-ammonification of nitrogenous organic compounds(NOCs)remain unclear,partly due to the analytical challenges of small NOC *** study introduced a simple methodology for accurately and simultaneously quantifying multiple small NOCs during ammonification *** developed method employed phenyl isothiocyanate as derivatization reagents,followed by high-performance liquid chromatography analysis to measure primary and secondary amines,amides,as well as NH4+over variable photo-ammonification *** our experimental setup,vacuum ultraviolet(VUV)irradiation serves as the controlled reaction environment to simulate harsh photo-ammonification *** NOCs,including pyridine,N,N-dimethylformamide,and acrylonitrile,were chosen due to their structural diversity and environmental relevance as model *** method was able to achieve excellent nitrogen mass balance,and revealed that the last steps of photo-ammonification involved oxidation of nitrogen-adjacent carbon to amide followed by the cleavage of N-C *** novel method may also help quantitative investigation of nitrogen transformations in different environmental contexts.

关键词： Ammonification NOCs Amines Nitrogen mass balance

Interfacial high-concentration electrolyte for stable lithium metal anode:Theory,design,and demonstration

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Nano Research 2023年第6期16卷 8321-8328页

作者： Haotian Lu chunpeng yang Feifei Wang Lu Wang Jinghong Zhou Wei Chen Quan-Hong yang Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and Technologyand Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Department of Chemistry National University of SingaporeSingapore 117543Singapore State-Key Laboratory of Chemical Engineering East China University of Science of TechnologyShanghai 200237China

Lithium metal anodes hold great potential for high-energy-density secondary ***,the uncontrollable lithium dendrite growth causes poor cycling efficiency and severe safety concerns,hindering lithium metal anode from practical *** components play important roles in suppressing lithium dendrite growth and improving the electrochemical performance of long-life lithium metal anode,and it is still challenging to effectively compromise the advantages of the conventional electrolyte(1 mol·L^(−1)salts)and high-concentration electrolyte(>3 mol·L^(−1)salts)for the optimizing electrochemical ***,we propose and design an interfacial high-concentration electrolyte induced by the nitrogen-and oxygen-doped carbon nanosheets(NO-CNS)for stable Li metal *** NO-CNS with abundant surface negative charges not only creates an interfacial high-concentration of lithium ions near the electrode surface to promote chargetransfer kinetics but also enables a high ionic conductivity in the bulk electrolyte to improve ionic *** from the interfacial high-concentration electrolyte,the NO-CNS@Ni foam host presents outstanding electrochemical cycling performances over 600 cycles at 1 mA·cm^(−2) and an improved cycling lifespan of 1,500 h for symmetric cells.

关键词： lithium metal anode dendrite growth interfacial high-concentration electrolyte surface negative charge

Effect of internal defects on tensile strength in SLM additively-manufactured aluminum alloys by simulation

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Chinese Journal of Aeronautics 2023年第10期36卷 485-497页

作者： Xin SONG Bowen FU Xin CHEN Jiazhen ZHANG Tong LIU chunpeng yang Yifan YE School of Mechanical Power Engineering Harbin University of Science and TechnologyHarbin 150080China COMAC Beijing Aircraft Technology Research Institute Beijing 102211China

This research investigates the effect of internal defects on the tensile strength of Selective Laser Melting(SLM)additively-manufactured aluminum alloy(AlSi10Mg)test parts used for civil aircraft light weight design.A Finite Element Analysis(FEA)model containing internal defects was established by combining test data and the stress concentration factor comparison *** effect of variation in the number,location and shape of defects on the finite element results was *** results show that it is reasonable to use spherical defect *** finite element modeling and analysis methods are also applied to the study of the effect of internal defects on tensile strength in additive manufacturing of other metallic *** to the FEA results of single defects at different scales,the formula for calculating the weakening degree of tensile strength applicable to the defective area of less than 15%was *** result of the procedure is reliable and *** research results can guide the selection of process parameters for the additive manufacturing of aluminum ***,the research results can promote the application of metal additive manufacturing in designing light-weight civil aircraft structures.

关键词： Additive manufacturing Internal defects Tensile strength Elasticity FEA Simulation experiments

维普期刊数据库

Bilayer separator enabling dendrite-free zinc anode with ultralong lifespan >5000 h

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Green Energy & Environment 2024年第4期9卷 771-776页

作者： Lu Wang Feifei Wang Zhe Ding Yingxin Liu Ziyi Zhang chunpeng yang Kian Ping Loh Quan-Hong yang Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou350207China Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China Department of Chemistry National University of Singapore117543Singapore Institute of Process Engineering Chinese Academy of SciencesBeijing100190China

Aqueous zinc(Zn)batteries with Zn metal anodes are promising clean energy storage devices with intrinsic safety and low ***,Zn dendrite growth severely restricts the use of Zn *** effectively suppress Zn dendrite growth,we propose a bilayer separator consisting of commercial butter paper and glassfiber *** dense cellulose-based butter paper(BP)with low zincophilicity and high mechanical properties prevents the pore-filling behavior of deposited Zn and related separator piercing,effectively suppressing the Zn dendrite *** a result,the bilayer separators endow the ZnjjZn symmetrical batteries with a superlong cycling life of Zn anodes(over 5000 h)at 0.5 mA cm^(-2) and the full batteries enhanced capacity retention,demonstrating the advancement of the bilayer separator to afford excellent cyclability of aqueous metal batteries.

关键词： Zn battery Bilayer separator Butter paper Zn metal anode Zn dendrite

维普期刊数据库

Garnet/polymer hybrid ion-conducting protective layer for stable lithium metal anode

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Nano Research 2017年第12期10卷 4256-4265页

作者： chunpeng yang Boyang Liu Feng Jiang Ying Zhang Hua Xie Emily Hitz Liangbing Hu Department of Materials Science and Engineering University of Maryland College Park Maryland 20742 USA

Rechargeable Li metal batteries using Li metal anodes have attracted worldwide interest because of their high energy density. The critical barriers limiting their commercial application include uncontrolled dendritic Li growth and the unstable Li-electrolyte interface. Considerable efforts have been directed towards solving these problems, e.g., modifying the electrolyte, creating artificial interfacial layers for the Li metal, and constructing three-dimensional structures for the Li metal. However, stabilizing the Li metal interface remains challenging because of the highly reactive nature of the Li metal. In this study, we utilize a Li-ion conducting hybrid film comprising a garnet-type ion conductor and a poly（ethylene oxide）-based polymer electrolyte as a protective layer to stabilize the Li-electrolyte interface and mitigate the growth of Li dendrites. The hybrid ion-conducting layer can block Li dendrites from proliferating and accommodate Li volume expansion because of its robust mechanical properties. Moreover, the ion-conducting layer allows Li deposition only underneath it, rather than on the surface, functioning as a permanent protective layer to ensure the stability of the Li metal over a long cycling life. The dendrite-inhibiting effect of the ion-conducting protective layer is visually evidenced by in situ microscopy using planar batteries. The protective Li metal anode exhibits excellent cycling stability and low voltage hysteresis （-15 mV at 0.2 mA-cm-2） for a cycle life as long as 1,000 h. It also shows a high Coulombic efficiency （-99.5%） in a full cell against a LiFePO4 cathode, exhibiting promise for application in Li metal batteries. Our results imply that the ion-conducting protective layer markedly improves the metal anode, yielding safe, long-life, and high-energy-density batteries.

关键词： Li metal battery Li dendrites garnet solid-state electrolyte interface protection ion-conductingmembrane

Remark on Risk Perception with Overconfidence

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Journal of Systems Science and Information 2008年第3期6卷 221-226页

作者： chunpeng yang School of Economics and Commerce South China University of Technology Guangzhou 510006China

Some financial experiments find that individuals＇ risk perception in favor of shortfall measures like LPMs. This paper provides an individuals＇ risk perception model and a risk perception model with overconfidence according to results of financial experiments and shows that investors＇ psychology could influence individuals＇ risk perceptions, and further, investors＇ psychology could influence investment decisions.

关键词： lower partial moments risk perception overconfidence

Uncovering the critical impact of the solid electrolyte interphase structure on the interfacial stability

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InfoMat 2022年第3期4卷 98-108页

作者： Zhenglin Hu Chen Wang Chao Wang Bingbing Chen chunpeng yang Shanmu Dong Guanglei Cui Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdaoChina

Solid electrolyte interphase(SEI)plays a critical role in determining the interfacial stability,which in turn impacts the plating/stripping process of the lithium metal *** research has been focused on the composition of SEI and its contribution to the interfacial ***,we illustrate the significance of SEI structure,in a comprehensive comparison of a diluted electrolyte(1 M LiTFSI-PC)and a super-concentrated electrolyte(8 M LiTFSI-PC).Illustrated by in situ optical and atomic force microscope observation,homogeneous plating on lithium anode is achieved in the concentrated ***,x-ray photoelectron spectroscopy and molecular dynamics simulations reveal that,contrary to the general understanding,the components of SEI is nearly identical for lithium anode cycled in both two *** characterizations demonstrate the structure of SEI is quite *** concentrated electrolyte,a compact structure of SEI layer can be obtained,mainly due to the reduced solubility and outstanding formation kinetics of the interfacial *** work provided a new understanding to the excellent performance of super-concentrated electrolyte in lithium metal battery.

关键词： lithium anode lithium dendrite solid electrolyte interphase super-concentrated electrolyte

S-harmonic Function and RieszDecomposition Theorem of Superprocesses

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应用数学 1998年第2期 27-31页

作者： yang chunpeng(Department of Mathematics, Zhengzhou University, Zhengzhou 450052 )

In this paper we studided S-harmonic function and the Riesz decomposition theorem for a class of superprocesses by probabilistic methods.

关键词： S-harmonic function S-excessive function S-potential Recived

Sieving carbons promise practical anodes with extensible low-potential plateaus for sodium batteries

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National Science Review 2022年第8期9卷 118-126页

作者： Qi Li Xiangsi Liu Ying Tao Jianxing Huang Jun Zhang chunpeng yang Yibo Zhang Siwei Zhang Yiran Jia Qiaowei Lin Yuxuan Xiang Jun Cheng Wei Lv Feiyu Kang Yong yang Quan-Hong yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin University Nanoyang Group Joint School of National University of Singapore and Tianjin UniversityInternational Campus of Tianjin University Haihe Laboratory of Sustainable Chemical Transformations State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University Shenzhen Key Laboratory for Graphene-Based Materials Engineering Laboratory for Functionalized Carbon MaterialsTsinghua Shenzhen International Graduate SchoolTsinghua University

Non-graphitic carbons are promising anode candidates for sodium-ion batteries, while their variable and complicated microstructure severely limits the rational design of high-energy carbon anodes that could accelerate the commercialization of sodium-ion batteries, as is the case for graphite in lithium-ion ***, we propose sieving carbons, featuring highly tunable nanopores with tightened pore entrances, as high-energy anodes with extensible and reversible low-potential plateaus(<0.1 V). It is shown that the tightened pore entrance blocks the formation of the solid electrolyte interphase inside the nanopores and enables sodium clustering to produce the plateau. Theoretical and spectroscopic studies also show that creating a larger area of sodiophilic pore surface leads to an almost linearly increased number of sodium clusters, and controlling the pore body diameter guarantees the reversibility of sodium cluster formation,producing a sieving carbon anode with a record-high plateau capacity of 400 mAh g–1. More excitingly, this approach to preparing sieving carbons has the potential to be scalable for modifying different commercial porous carbons.

关键词： sodium-ion batteries sieving carbons low-potential plateau pore entrance diameter pore surface area