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Polyacrylate modified Cu electrode for selective electroch.mical CO_(2) reduction tow.rds multicarbon products

Science Bulletin 2024年第15期69卷 2395-2404页

作者： Yuch.an Sh. Kaini Zh.ng chung-Li Dong Ta Th. Th.y Nga Miao w.ng Daixing w.i Jialin w.ng Yiqing w.ng Sh.oh.a Sh.n International Research.Center for Renew.ble Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Ph.sics Tamkang UniversityNew Taipei City 25137China

h.gh.y selective production of value-added multicarbon(C^(2+))products via electroch.mical CO_(2) reduction reaction(eCO_(2)RR)on polycrystalline copper(Cu)remains ***,th. facile surface modification using poly(α-eth.l cyanoacrylate)(PECA)is presented to greatly enh.nce th. C^(2+)selectivity for eCO_(2)RR over polycrystalline Cu,w.th.Faradaic efficiency(FE)tow.rds C^(2+)products increased from30.1%for th. Cu electrode to 72.6%for th. obtained Cu-PECA electrode at-1.1 V *** h.drogen electrode(Rh.).Given th. w.ll-determined FEs tow.rds C^(2+)products,th. partial current densities for C^(2+)production could be estimated to be-145.4 mA cm~(-2)for th. Cu-PECA electrode at-0.9 V *** in a h.memade flow.***-situ spectral ch.racterizations and th.oretical calculations reveal th.t PECA featured w.th.electron-accepting-C≡N and-COOR groups decorated onto th. Cu electrode could inh.bit th. adsorption of^(*)h.intermediates and stabilize th.^(*)CO intermediates,given th. redistributed interfacial electron density and th. raised energy level of d-band center(E_(d))of Cu active sites,th.s facilitating th. C-C coupling and th.n th. C^(2+)selective *** study is believed to be guidable to th. modification of electrocatalysts and electrodes w.th.polymers to steer th. surface adsorption beh.viors of reaction intermediates to realize practical eCO_(2)RR tow.rds value-added C^(2+)products w.th.h.gh.activity and selectivity.

关键词： Electroch.mical CO_(2)reduction Polymer modification Electron transfer C_(2+)products

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Ch.racterization of h.avy petroleum fraction by positive-ion electrospray ionization FT-ICR mass spectrometry and collision induced dissociation: Bond dissociation beh.vior and aromatic ring arch.tecture of basic nitrogen compounds

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Science Ch.na Ch.mistry 2013年第7期56卷 874-882页

作者： Zh.NG LinZh.u Zh.NG Yah. Zh.O SuoQi XU Ch.nMing chung Keng h. Sh. Quan State Key Laboratory of h.avy Oil Processing China University of Petroleum

Th.s paper examined th. bond dissociation beh.vior and aromatic ring arch.tecture of basic nitrogen compounds in Sudan h.avy petroleum fraction. Both.broadband and quadrupole isolation modes positive-ion electrospray ionization （ESI） Fourier transform ion cyclotron resonance mass spectrometry （FT-ICR MS） coupled w.th.collision induced dissociation （CID） tech. niques w.re used to ch.racterize a low.sulfur crude oil derived vacuum residuum （VR）. Th. appropriate CID operating condi- tion w.s selected by comparing th. molecular w.igh. distributions of th. basic nitrogen compounds under various CID operat- ing conditions. Both.odd- and even-electron fragment ions w.re observed from th. mass spectrum, indicating th.t th. h.tero- lyric and h.molytic bond cleavages occurred simultaneously during th. CID process. Th. odd-electron fragment ions w.re predominant in each.class species, indicating preferential h.terolytic bond cleavages. At th. optimal CID condition, th. alkyl groups decomposed deeply and just left th. aromatic cores of th. nitrogen compounds. No Significant variation in double bond equivalent （DBE） value w.s observed betw.en th. fragment and parent ions, revealing th.t th. domination of single core structure.

关键词： FT-ICR MS CID h.avy oil molecular structure

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Ch.lcogen h.teroatoms doped nickel-nitrogen-carbon single-atom catalysts w.th.asymmetric coordination for efficient electroch.mical CO_(2)reduction

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Ch.nese Journal of Catalysis 2024年第9期64卷 54-65页

作者： Jialin w.ng Kaini Zh.ng Ta Th. Th.y Ng Yiqing w.ng Yuch.an Sh. Daixing w.i chung-Li Dong Sh.oh.a Sh.n International Research.Center for Renew.ble Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina Department of Ph.sics Tamkang UniversityNew Taipei City 25137TaiwanChina

Th. electronic configuration of central metal atoms in single-atom catalysts(SACs)is pivotal in electroch.mical CO_(2)reduction reaction(eCO_(2)RR).h.rein,ch.lcogen h.teroatoms(e.g.,S,Se,and Te)w.re incorporated into th. symmetric nickel-nitrogen-carbon(Ni-N4-C)configuration to obtain Ni-X-N3-C(X:S,Se,and Te)SACs w.th.asymmetric coordination presented for central Ni *** th.se obtained Ni-X-N3-C(X:S,Se,and Te)SACs,Ni-Se-N3-C exh.bited superior eCO_(2)RR activity,w.th.CO selectivity reach.ng~98%at-0.70 V versus reversible h.drogen electrode(Rh.).Th. Zn-CO_(2)battery integrated w.th.Ni-Se-N3-C as cath.de and Zn foil as anode ach.eved a peak pow.r density of 1.82 mw.cm-2 and maintained remarkable rech.rgeable stability over 20 ***-situ spectral investigations and th.oretical calculations demonstrated th.t th. ch.lcogen h.teroatoms doped into th. Ni-N4-C configuration w.uld break coordination symmetry and trigger ch.rge redistribution,and th.n regulate th. intermediate beh.viors and th.rmodynamic reaction path.0}ys for eCO_(2)***,for Ni-Se-N3-C,th. introduced Se atoms could significantly raise th. d-band center of central Ni atoms and th.s remarkably low.r th. energy barrier for th. rate-determining step of*COOh.formation,contributing to th. promising eCO_(2)RR performance for h.gh.selectivity CO production by competing w.th.h.drogen evolution reaction.

关键词： Electroch.mical CO_(2)reduction reaction Ch.lcogen h.teroatoms Single-atom catalysts Asymmetric coordination CO production

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Carbon monoxide decreases interleukin-1β levels in th. lung th.ough.th. induction of pyrin

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Cellular & Molecular Immunology 2017年第4期14卷 349-359页

作者： Seul-Ki Kim Yeonsoo Joe Yingqing Ch.n Jinh.un Ryu Jeong-h.e Lee Gyeong Jae Ch. Stefan w. Ryter h.n Taeg chung Department of Biological Sciences University of Ulsan Ulsan 680-749 Republic of Korea Department of Anatomy School of Medicine and Institute of Health Sciences Gyeongsang National University Jinju 660-701 Republic of Korea Department of Path.logy School of Medicine and Institute of Health Sciences Gyeongsang National University Jinju 660-701 Republic of Korea Joan and Sanford I. w.ill Department of Medicine New York-Presbyterian Hospital Division of Pulmonary and Critical Care Medicine Weill Cornell Medical Center New York NY USA

Carbon monoxide （CO） can act as an anti-inflammatory effector in mouse models of lung injury and disease, th.ough.th. dow.regulation of pro-inflammatory cytokines production, th.ugh.th. underlying mech.nisms remain unclear. Th. nucleotide-binding oligomerization domain-, leucine-rich.region-, and pyrin domain-containing-3 （NLRP3） inflammasome is a protein complex th.t regulates th. maturation and secretion of pro-inflammatory cytokines, including interleukin-1β （IL-1β）. In th.s report, w. sh.w.th.t th. CO-releasing molecule （CORM-2） can stimulate th. expression of pyrin, a negative regulator of th. NLRP3 inflammasome. CORM-2 increased th. transcription of pyrin in th. h.man leukemic cell line （Th.-1） in th. absence and presence of lipopolysacch.ride （LPS）. In Th.-1 cells, CORM-2 treatment dose-dependently reduced th. activation of caspase-1 and th. secretion of IL-lp, and increased th. levels of IL-IO, in response to LPS and adenosine 5＇-triph.sph.te （ATP）, an NLRP3 inflammasome activation model. Genetic interference of IL-10 by small interfering RNA （siRNA） reduced th. effectiveness of CORM-2 in inh.biting IL-1β production and in inducing pyrin expression. Genetic interference of pyrin by siRNA increased IL-lp production in response to LPS and ATP, and reversed CORM-2-dependent inh.bition of caspase-1 activation. CO inh.lation （250 ppm） in vivo increased th. expression of pyrin and IL-10 in lung and spleen, and decreased th. levels of IL-1β induced by LPS. Consistent w.th.th. induction of pyrin and IL-10, and th. dow.regulation of lung IL-1β production, CO provided protection in a model of acute lung injury induced by intranasal LPS administration. Th.se results provide a novel mech.nism underlying th. anti-inflammatory effects of CO, involving th. IL-10-dependent upregulation of pyrin expression.

关键词： anti-inflammatory effects carbon monoxide (CO) IL-1β inflammasome pyrin

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Th.rmal transformation of acid compounds in h.gh.TAN crude oil

引用

Science Ch.na Ch.mistry 2013年第7期56卷 848-855页

作者： YANG BaiBing XU Ch.nMing Zh.O SuoQi h.U Ch.ng Samuel chung Keng h. Sh. Quan State Key Laboratory of h.avy Oil Processing China University of Petroleum

Th. Liaoh. crude oil w.th.h.gh.total acid number （TAN） w.s subjected to th.rmal reaction at 300 ℃ to 500℃. Reaction products w.re collected and analyzed by negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry （ESI FT-ICR MS） to determine acid compounds in th. crude oil. Th. double-bond equivalence （DBE） versus carbon number w.s used to ch.racterize th. oxygenated components in th. feed and reaction products. Th. 02 class w.ich.mainly corresponds to naph.h.nic acids decarboxylated at 350-400℃, resulting in a sh.rply decrease in TAN. Ph.nols （O1 class） are more th.rmally stable th.n carboxylic acids. Carboxylic acids w.re also th.rmally cracked into smaller molecular size acids, evidenced by th. presence of acetic acid, propanoic acid, and butyric acid in th. liquid product. Th.se small acid species are strong acids likely responsible for corrosion problems in refineries.

关键词： naph.h.nic acid TAN ESI FT-ICR MS th.rmal cracking

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Bifurcations of limit cycles in a Z_6-equivariant planar vector field of degree 5

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Science Ch.na Math.matics 2002年第7期45卷 817-826页

作者：李继彬 h.S.Y.Ch.n K.w.chung Sch.ol of Science Kunming University of Science and Technology Kunming 650093 China Department of Math.matics City University of Hong Kong Hong Kong Hong Kong

A concrete numerical example of Z6-equivariant planar perturbed h.miltonian polynomial vector fields of degree 5 h.ving at least 24 limit cycles and th. configurations of compound eyes are given by using th. bifurcation th.ory of planar dynamical systems and th. meth.d of detection functions. Th.re is reason to conjecture th.t th. h.lbert number h.2k + 1) ? (2k + I)2 - 1 for th. perturbed h.miltonian systems.

关键词： h.lbert’s 16th.problem limit cycle equivariant vector field meth.d of detection function polynomial system

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食物回收等级制度帮助处理剩余食物（英文）

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英语画刊(高中版) 2024年第1期 12-14页

作者： Daisy chung Ally J.Levine Clare Trainor

每天,世界各个角落都会丢弃大量的剩余食物,比如吃不完的饭菜、发霉的面包和不能吃的果皮果核等。这不仅造成食物浪费,还会导致环境问题日益严重。h.mans grow.and w.ste food at a staggering(令人吃惊的)*** devote h.lf th. earth.s...

每天,世界各个角落都会丢弃大量的剩余食物,比如吃不完的饭菜、发霉的面包和不能吃的果皮果核等。这不仅造成食物浪费,还会导致环境问题日益严重。h.mans grow.and w.ste food at a staggering(令人吃惊的)*** devote h.lf th. earth.s h.bitable land to food production,w.ile ultimately tossing one-th.rd of th.t food.

关键词：

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Effect of Polarization Dependent Loss on Polarization-Multiplexed Transmission System

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光学学报 2003年第S1期23卷 641-642页

作者： h. C. Ji J. h. Lee K. J. Park Y. C. chung Department of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 KoreaDepartment of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 KoreaDepartment of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 KoreaNEC corporation Networking Research Laboratories Kawasaki JapanDepartment of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Korea

w. report on th. effects of th. polarization-dependent loss (PDL) on th. polarization-multiplexed system. Th. result sh.w. th.t th. PDL of 0.9 dB could cause 1-dB pow.r penalty. Unlike PMD, th. effect of PDL w.s not d... 详细信息

关键词： PDL as of Effect of Polarization Dependent Loss on Polarization-Multiplexed Transmission System on

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Molecular ch.racterization of polar h.teroatom species in oilsands bitumen-derived vacuum residue fractions by Fourier transform ion cyclotron resonance mass spectrometry

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Petroleum Science 2019年第5期16卷 1196-1207页

作者： Fang Zh.ng w.rren chung Eusebio Palmisano Dah.i Dong Quan Sh. Zh.ming Xu Keng h.chung State Key Laboratory of h.avy Oil Processing China University of PetroleumBeijing 102249China w.ll Resources Inc EdmontonCanada Cenovus Energy Inc CalgaryCanada Qingdao Institute of Bioenergy and Bioprocess Tech.ology Chinese Academy of SciencesQingdao 266101China

A Canadian in situ oilsands bitumen-derived vacuum residue(VR)w.s subjected to supercritical fluid extraction and fractionation(SFEF)into 13 extractable fractions and an unextractable end-cut and ch.racterized by positive-and negative-ion electrospray ionization(ESI)Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS).Th. results of negative-ion ESI FT-ICR MS sh.w.d th.t th. N1 class species w.s th. most abundant and th. multifunctional group compounds,such.as N1 O1,N1 O2,N1 S1,N1 S2,and N2 class species became abundant as th. SFEF fraction became *** positive-ion ESI mode,th. relative abundance of N1 class species decreased gradually in th. h.avy SFEF fractions w.ile th.t of multifunctional group compounds *** relative abundance of N4 V1 O1 increased dramatically in h.avy fractions and th. *** distributions of polar h.teroatom species of VR derived from oilsands bitumen w.re similar w.th.th.se of VR derived from th. Venezuela Orinoco extra h.avy oil.

关键词： Molecular ch.racterization Canadian oilsands bitumen SFEF ESI FT-ICR MS

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Is quantum capacitance in graph.ne a potential h.rdle for device scaling？

引用

Nano Research 2014年第4期7卷 453-461页

作者： Jaeh. Lee h.un-Jong chung David h. Seo Jaeh.ng Lee h.ungch.ol Sh.n Sunae Seo Seongjun Park Sungw.o h.1}ng Kinam Kim Samsung Advanced Institute of Tech.ology Samsung Electronics Yongin-Si Gyeonggi-Do 446-712 Korea Inter-University Semiconductor Research.Center (ISRC) School of Electrical Engineering and Computer Science Seoul National University Seoul 151-742 Korea Division of Quantum Ph.ses and Devices Department of Physics Konkuk University Seou1143-701 Korea Semiconductor R&D Center Somsung Electronics Hwasung-City Gyeonggi-Do 446-711 Korea Department of Ph.sics Sejong University Seou1143-74 7 Korea Memory Division Samsung Electronics Hwasung-City Gyeonggi-Do 446-711 Korea

Transistor size is constantly being reduced to improve performance as w.ll as pow.r consumption. For th. ch.nnel length.to be reduced, th. corresponding gate dielectric th.ckness sh.uld also be reduced. Unfortunately, graph.ne devices are more complicated due to an extra capacitance called quantum capacitance （CQ） w.ich.limits th. effective gate dielectric reduction. In th.s w.rk, w. analyzed th. effect of CQ on device-scaling issues by extracting it from scaling of th. ch.nnel length.of devices. In contrast to previous reports for metal-insulator- metal structures, a practical device structure w.s used in conjunction w.th.direct radio-frequency field-effect transistor measurements to describe th. graph.ne ch.nnels. In order to precisely extract device parameters, w. reassessed th. equivalent circuit, and concluded th.t th. on-state model sh.uld in fact be used. By careful consideration of th. underlap region, our device modeling w.s sh.w. to be in good agreement w.th.th. experimental data. CQ contributions to equivalent oxide th.ckness w.re analyzed in detail for varying impurity concentrations in graph.ne. Finally, w. w.re able to demonstrate th.t despite contributions from CQ, graph.ne＇s h.gh.mobility and low.voltage operation allow. for ~raph.ne ch.nnels suitable for next generation transistors.

关键词： graph.ne equivalent circuit quantum capacitance intrinsic delay

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