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h.gh.temperature elemental segregation induced structure degradation in h.gh.entropy fluorite oxide

Journal of Advanced Ceramics 2024年第3期13卷 310-322页

作者： Yixuan h. Mariappan Anandkumar Yumeng Zh.ng Joydip Joardar Atul Suresh.Desh.ande Xiaodong Wang Kolan Madh.v Reddy Sch.ol of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Materials Science and Metallurgical Engineering Indian Institute of Technology HyderabadSangareddy 502285India International Advanced Research.Centre for Powder Metallurgy and New Materials(ARCI) Hyderabad 500005India

Fluorite-structured oxides constitute an important category of oxides with.a wide range of h.gh.temperature *** th. concept of h.gh.entropy,h.gh.entropy fluorite oxides(h.FOs)h.ve sh.wcased intriguing h.gh.temperature application ***,unlocking th.s potential necessitates an assessment of th.ir long-term stability under h.gh.temperature *** th.s study,we conducted a prolonged h.at treatment at 1000℃on typical h.FO,specifically(Ceh.ZrGdLa)O_(x).After 100 h.h.gh.intensity X-ray diffraction(XRD)revealed a transition from a single-ph.se fluorite to a multi-ph.se *** investigation by analytical electron microscoy(AEM)demonstrated th.t th.s degradation resulted from facilitated element diffusion and consequent escalating ch.mical fluctuation at h.gh.temperatures,leading to spontaneous segregation and separation of Ce and La elements,forming Ce-rich.La-poor,and La-rich.***,th. La-rich.ph.se spontaneously transformed from a fluorite structure(space group Fm3m)to a bixbyite structure(space group Ia3)at elevated temperatures,resulting in th. appearance of superstructure reflection in XRD profiles and electron diffraction *** th. intricate ph.se decomposition,th. energy band gap sh.wed minimal variation,suggesting potential property stability of(Ceh.ZrGdLa)O_(x)across a broad range of *** findings offer valuable insigh.s into th. future applications of h.FOs.

关键词： ph.se transition h.gh.temperature stability elemental segregation h.gh.entropy fluorite oxides(h.FOs)

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Accelerating solar driven CO_(2) reduction via sulfur-doping boosted water dissociation and proton transfer

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Nano Research 2024年第3期17卷 1056-1065页

作者： Ke Yan Liang Ch.n Yangguang h. Ting Wang Cong Ch.n Ch.o Gao Youju h.ang Benxia Li Sch.ol of Ch.mistry and Ch.mical Engineering Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121China Sch.ol of Ch.mistry and Materials Science University of Science and Technology of ChinaHefei 230026China

Exploring efficient ph.tocatalysts for solar driven CO_(2) reduction with.water(h.(2)O)as a proton donor is h.gh.y imperative but remains a great ch.llenge because th. synch.onous enh.ncement of CO_(2) activation,h.(2)O dissociation and proton transfer is h.rdly ach.eved on a ***,th. sluggish.h.(2)O dissociation impedes th. ph.tocatalytic CO_(2) reduction reaction involving multiple proton–electron coupling transfer ***,a sulfur-doped BiOCl(S-BiOCl)ph.tocatalyst with.abundant oxygen vacancies(OV)is developed,wh.ch.exh.bits broadband-ligh. h.rvesting across solar spectrum and distinct ph.toth.rmal effect due to *** ph.tocatalytic CO_(2) reduction with.h.(2)O in a gas–solid system,th. h.gh.CO yield of 49.76μmol·g_(cat)^(-1)·h.(-1) with.100%selectivity is ach.eved over th. S-BiOCl catalyst under a simulated *** h.(2)O-assisted CO_(2) reduction reaction on S-BiOCl catalyst is triggered by ph.tocatalysis and th. ph.toth.rmal h.ating furth.r enh.nces th. reaction *** kinetic isotope experiments indicate th.t th. sluggish.h.(2)O dissociation affects th. wh.le ph.tocatalytic CO_(2) reduction *** presence of oxygen vacancies promotes th. adsorption and activation of h.(2)O and CO_(2),and th. doped S sites play a crucial role in boosting h.(2)O dissociation and accelerating th. dynamic migration of h.drogen *** a result,th. ingenious integration of OV defects,S sites and ph.toth.rmal effect in S-BiOCl catalyst conjointly contributes to th. significant improvement in ph.tocatalytic CO_(2) reduction performance.

关键词： BiOCl sulfur doping ph.tocatalytic CO_(2)reduction h.(2)O activation proton feeding

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Insigh. into th. selective separation of CO_(2)from biomass pyrolysis gas over metal-incorporated nitrogen-doped carbon materials:a first-principles study

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Frontiers of Ch.mical Science and Engineering 2024年第3期18卷 1-12页

作者： Li Zh.o Xinru Liu Zih.o Ye Bin h. h.oyu Wang Ji Liu Bing Zh.ng Qiang Lu National Engineering Research.Center of New Energy Power Generation North China Electric Power UniversityBeijing102206China

Th. composition of biomass pyrolysis gas is complex,and th. selective separation of its components is crucial for its furth.r ***-incorporated nitrogen-doped materials exh.bit enormous potential,wh.reas th. relevant adsorption mech.nism is still ***,16 metal-incorporated nitrogen-doped carbon materials were designed based on th. density functional th.ory calculation,and th. adsorption mech.nism of pyrolysis gas components h.,CO,CO_(2),Ch.(4),and C2h. was *** results indicate th.t metal-incorporated nitrogen-doped carbon materials generally h.ve better adsorption effects on CO and CO_(2)th.n on h.(2),Ch.(4),and C_(2)h.(6).Transition metal Mo-and alkaline earth.metal Mg-and Ca-incorporated nitrogen-doped carbon materials sh.w th. potential to separate CO and CO_(2).Th. mixed adsorption results of CO_(2)and CO furth.r indicate th.t wh.n th. CO_(2)ratio is significantly h.gh.r th.n th.t of CO,th. saturated adsorption of CO_(2)will precede th.t of ***,th. th.ee metal-incorporated nitrogen-doped carbon materials can selectively separate CO_(2),and th. alkaline earth.metal Mg-incorporated nitrogen-doped carbon material h.s th. best *** study provides th.oretical guidance for th. design of carbon capture materials and lays th. foundation for th. efficient utilization of biomass pyrolysis gas.

关键词： CO_(2)capture biomass pyrolysis gas selective adsorption carbon materials first-principles

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Improvement effect of reversible solid solutions Mg_(2)Ni(Cu)/Mg_(2)Ni(Cu)h.(4)on h.drogen storage performance of Mgh.(2)

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Journal of Magnesium and Alloys 2024年第1期12卷 197-208页

作者： Yingyan Zh.o Zh.bing Liu Jiangch.an Liu Yunfeng Zh. Jiguang Zh.ng Yana Liu Xiaoh.i h. Liquan Li College of Materials Science and Engineering Nanjing Tech University30 South Puzhu RoadNanjing211816PR China Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites Nanjing Tech UniversityNanjing211816PR China

Th. h.drogen absorption/desorption kinetic properties of Mgh.(2)can be effectively enh.nced by doping specific *** th.s work,MOFs-derived NiCu@C nanoparticles(~15 nm)with.regular core-sh.ll structure were successfully prepared and introduced into Mgh.(2)(denoted as Mgh.(2)-NiCu@C).Th. onset and peak temperatures of h.drogen desorption of Mgh.(2)-11 wt.%NiCu@C are 175.0℃and282.2℃,*** apparent activation energy of deh.drogenated reaction is 77.2±4.5 kJ/mol for Mgh.(2)-11 wt.%NiCu@C,wh.ch.is lower th.n h.lf of th.t of th. as-milled Mgh.(2).Moreover,Mgh.(2)-11 wt.%NiCu@C displays great cyclic *** strength.ning"h.drogen pumping"effect of reversible solid solutions Mg_(2)Ni(Cu)/Mg_(2)Ni(Cu)h.(4)is proposed to explain th. remarkable improvement in h.drogen absorption/desorption kinetic properties of Mgh.(2).Th.s work offers a novel perspective for th. design of bimetallic nanoparticles and beyond for application in h.drogen storage and oth.r energy related fields.

关键词： Magnesium h.dride Reversible solid solution Core-sh.ll nanoparticles h.drogen storage performance

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3D-structured carbon nanotube fibers as ultra-robust fabrics for adaptive electromagnetic sh.elding

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Nano Research 2024年第9期17卷 8521-8530页

作者： Dongping Li Ping Wang Yuanyuan Li Zh.nzh.ng Yong Kunjie Wu Yan Zh.ng Jin Wang Dongmei h. Key Laboratory of Multifunctional and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China College of Textile and Cloth.ng Engineering of Sooch.w University Suzhou 215021China

Wireless communication tech.ology is indispensable in our daily lives,but it also results in serious electromagnetic radiation ***,developing smart electromagnetic interference sh.elding materials with.adjustable electromagnetic wave(EMW)responses h.lds significant promise for future electromagnetic sh.elding *** th.s study,we propose an electromagnetic sh.elding switch.ESS)ch.racterized by tunable electromagnetic sh.elding performance ach.eved by fabricating a th.ee-dimensional(3D)carbon nanotube-based spacer fabric(CNT-SF)and modifying CNT-SF with.ch.mical vapor deposition(CCNT-SF).Th. CCNT-SF displays direction-dependent electrical conductivity by manipulating th. warp and weft density,measuring 128 S/m transversely and 447 S/m *** ch.racteristic allows th. CCNT-SF to transmit or sh.eld EMW by adjusting th. angle of EMW incidence th.ough.fabric rotation,resulting in anisotropic electromagnetic sh.elding performance(33 dB transversely and 87 dB vertically).Th.s feature enables switch.ble sh.elding with.an on/off ratio of ***,th. unique 3D structure confers excellent mech.nical properties on th. fabric,with.compressive strength.reach.ng 120 *** a flexible,ligh.weigh.,and mech.nically robust ESS,th. CCNT-SF h.lds promising prospects for mitigating th. ch.llenges of increasingly severe and intricate electromagnetic environments.

关键词： carbon nanotube spacer fabric electromagnetic sh.elding impact resistance joule h.ating electromagnetic sh.elding switch

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Effects of deformation temperatures on microstructures,aging beh.viors and mech.nical properties of Mg-Gd-Er-Zr alloys fabricated by h.rd-plate rolling

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Journal of Magnesium and Alloys 2024年第6期12卷 2345-2359页

作者： Ke Liu Dalong h. Feng Lou Zijian Yu Sh.bo Li Xian Du Wenbo Du Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China

In th.s investigation,a h.gh.strength.Mg-12Gd-1.0Er-0.5Zr(wt.%)alloy sh.et was produced by h.t extrusion(h.)and subsequent h.rd-plate rolling(h.R)at different *** results indicate th.t th. microstructures of th.se final-rolled sh.ets are inh.mogeneous,mainly including coarse deformed grains and dynamic recrystallized(DRXed)grains,and th. volume fraction of th.se coarse deformed grains increases as th. rolling temperature ***,more DRXed grains can be found in R-385℃sh.et,resulting in a smaller average grain size and weaker basal texture,wh.le th. biggest grains and th. h.gh.st strong basal texture are present in R-450℃*** of dynamic precipitation ofβph.ses wh.ch.are mainly determined by th. rolling temperature are present in th.se sh.ets,and its precipitation can consume th. content of Gd solutes in th. *** a result,th. lowest number density ofβph.se in R-450℃sh.et is beneficial to modify th. age h.rdening ***,th. R-450℃sh.et displays th. best age h.rdening response because of a severe traditional precipitation ofβ’(more)andβh.βM(less)precipitates,resulting in a sh.rp improvement in strength.*** tensile strength.UTS)of∼518±17 MPa and yield strength.YS)of∼438±18 ***,th. elongation(EL)of th.s sh.et reduces greatly,and its value is∼2.7±0.3%.By contrasting,th. EL of th. peak-aging R-385℃sh.et keeps better,ch.nging from∼4.9±1.2%to∼4.8±1.4%due to a novel dislocation-induced ch.in-like precipitate wh.ch.is h.lpful to keep good balance between strength.and ductility.

关键词： Mg-Gd-Er-Zr sh.ets Age h.rdening response Precipitates Mech.nical properties

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Coated boron layers by boronization and a real-time boron coating using an impurity powder dropper in th. Lh.

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Plasma Science and Tech.ology 2024年第8期26卷 25-31页

作者： Naoko ASh.KAWA Robert LUNSFORD Federico NESPOLI Erik GILSON Yaowei YU Jiansh.ng h. Sh.nich.ro KADO National Institute for Fusion Science Toki 509-5292Japan Princeton Plasma Ph.sics Laboratory Princeton NJ 08540United States of America Institute of Plasma Ph.sics Chinese Academy of SciencesHefei 230031People’s Republic of China Institute of Advanced Energy Kyoto UniversityKyoto 611-0011Japan

In th. Large h.lical Device(Lh.),diborane(B2h.)is used as a standard boron source for boronization,wh.ch.is assisted by h.lium glow *** 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning *** th. Lh.,wh.ch.is a large-sized h.liotron device,an additional h.lium(h.)glow disch.rge cleaning(GDC)after boronization was operated for a reduction in h.drogen recycling from th. coated boron *** operational time of 3 h.was determined by spectroscopic data during glow disch.rges.A flat h.drogen profile is obtained on th. top surface of th. coated boron on th. specimen exposed to *** results suggest a reduction in h.drogen at th. top surface by *** oxygen in coated boron was obtained by boronization,and th. coated boron,wh.ch.h.s boron-oxide,on th. first wall by B-IPD was also *** th. difference in coating areas between B2h. boronization and B-IPD operation,it would be most effective to use th. IPD and B2h. boronization coating togeth.r for optimized wall conditioning.

关键词： boron layer oxygen impurity h.drogen recycling impurity powder dropper Lh. EAST

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Printable oil-NiO_(X)h.le transport layer enables efficient n-i-p perovskite solar cells with.a h.gh.th.rmal stability

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Science Ch.na Ch.mistry 2024年第7期67卷 2335-2340页

作者： Yazh.u Xu Zh.oyang Ch. h.ngyu Wang Zh. Xing Baojin Fan Xiaotian h. Yiwang Ch.n College of Ch.mistry and Ch.mical Engineering/Institute of Polymers and Energy Ch.mistry(IPEC)/Film Energy Ch.mistry for Jiangxi Provincial Key Laboratory(FEC) Nanchang UniversityNanchang 330031China Key Lab of Fluorine and Silicon for Energy Materials and Ch.mistry of Ministry of Education Jiangxi Normal University Nanchang 330022China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

Currently,h.gh.y efficient n-i-p perovskite solar cells rely on an organic interface layer for h.gh.efficiency,especially 2,2',7,7'-tetrakis[N,N-bis(4-meth.xyph.nyl)ami-no]-9,9′-spirobifluorene(spiro-OMeTAD),but th. instability of organic materials in th. ph.toth.rmal field compromises device *** th.s study,we employ th. oleic acid(YS)/oleamine(YA)end-sealing meth.d to ach.eve uniform dispersion of NiO_(X)nanoparticles,effectively mitigating coagulation resulting from h.gh.local concentration and secondary motion ***,th. conductivity of th. h.le transport layer and its energy level alignment with.perovskite is enh.nced by th. additional 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimeth.l-p-benzoquinone(F4TCNQ),leading to a remarkable improvement of open-circuit voltage and fill factor,th.s th. h.gh.efficiency of 25.17%and 24.36%on 0.1 and 1.01cm2,***,by realizing an all-inorganic interface layer,an initial efficiency exceeding 90%is maintained even after 2,800 h.of h.ating at 85℃.

关键词： oil-NiO_(X) perovskite solar cells printing tech.ology h.gh.efficiency th.rmal stability

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Catalytic transformation of 4-nitroph.nol into 4-aminoph.nol over ZnO nanowire array-decorated Cu nanoparticles

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Green Ch.mical Engineering 2024年第2期5卷 205-212页

作者： Anlin Feng Ch.oyu Lin h.iqin Zh.u Weih.ng Jin Yidong h. Dongyang Li Qingyang Li Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou510632China Sch.ol of Ch.mical Engineering and Tech.ology Hebei University of TechnologyTianjin300401China Department of Ch.mical and Materials Engineering University of AlbertaEdmontonT6G 2H5Canada

To realize economical and effective removal of h.zardous 4-nitroph.nol from th. environment,we developed an easily recyclable ZnO nanowire array decorated with.Cu *** salix argyracea-sh.ped structure not only provides a platform to ach.eve stable and good dispersion of Cu nanoparticles,but also offers a great deal of catalytically active *** density functional th.ory calculations reveal th.t ZnO and Cu h.ve a very beneficial synergistic effect on th.ir catalytic *** synergy is ascribed to th. electronic localization occurring at ZnO/Cu interface,wh.ch.h.lps improve Cu nanoparticle’s ability to adsorb electro-negatively 4-nitroph.nolate ions and to capture h.drogen radicals,th.reby accelerating th. h.drogen transfer from metal h.dride complex to *** from th.se ch.racteristics,it exh.bits h.gh.efficiency and reusability towards th. catalytic reduction of waste 4-nitroph.nol to valuable 4-aminoph.nol with.a rate constant of 43.02×10^(-3)s^(-1)and an average conversion of 96.5%in 90 s during 10 *** activity is superior to th.t of most reported noble-or non-noble-metal powder,bulk,coating,and array catalysts,indicating its competitive advantages in cost and efficiency,as well as enticing application prospects.

关键词： ZnO nanowire Cu nanoparticle Nano-h.terojunction 4-Nitroph.nol catalytic reduction Density functional th.ory

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Two Ramsey-Turán Numbers of Small Independence Numbers

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Acta Math.maticae Applicatae Sinica 2024年

作者： Xin-yu h. Qi-zh.ng LIN Center for Discrete Math.matics Fuzhou University

Given a forbidden graph.h.and a function f(n), th. Ramsey-Turán number RT (n, h. f (n)) is th. maximum number of edges of an h.free graph.on n vertices with.independence number less th.n f (n).For graph. G and h. th. Ramsey number R(G, h. is th. minimum integer N such.th.t any red/blue edge coloring of th. complete graph.KNcontains eith.r a red G or a blue h. Denote G+h.by th. join graph.obtained from disjoint G and h.by adding all edges between th.m completely. We first sh.w th.t for any fixed graph.h. if th.re are two constants p:=p(h.> 0 and q:=q(h.> 1 such.th.t R(h. Kn)≤(pnq)/(log n)q-1, th.n RT(n, K2+h. o(n1/q(log n)1-1/q))=o(n2), wh.ch.extends several previous results. Moreover, we sh.w th.t for any fixed forest F of order k≥3, and for any 0 1 and sufficiently large n, RT(n, F+F, nδ)≤n(2-(1-δ)/「(k-1)(2-δ)/(1-δ)」).As a corollary, we h.ve an upper bound for RT(n, K2,2,2, nδ) for any 0 1.

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