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Enhanced photocataly.ic perform.nce of Bi_(4)O_(5)Br_(2)with threedim.nsionally.ordered m.croporous structure for phenol rem.val

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Nano Research 2023年第7期16卷 8871-8881页

作者： Kunfeng Zhang Hongxia chen Wenbo Pei Hongxing dai Junshan Li y.ngfa Zhu department of Chem.stry Tsinghua UniversityBeijing 100084China College of Environm.ntal engineering Henan University of TechnologyZhengzhou 450001China department of Chem.stry.and chemical engineering College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China Institute for Advanced Study Chengdu UniversityChengdu 610106China

Herein,a series of three-dim.nsionally.ordered m.croporous(3DOm.Bi_(4)O_(5)Br_(2)photocataly.ts with different m.cropore sizes were successfully.fabricated via a poly.0}thy. m.thacry.ate(Pm.A)tem.late *** photocataly.ic activity.for phenol degradation over 3DOm.Bi_(4)O_(5)Br_(2)first increased and then decreased with the rise in m.cropore ***,3DOm.Bi_(4)O_(5)Br_(2)-255(m.cropore diam.ter ca.170 nm.exhibits the best photocataly.ic activity.in the static sy.tem.which is about 4.5,7.3,and 11.9 tim.s higher than those of bulk Bi_(4)O_(5)Br_(2),Bi_(2)WO_(6),and g-C_(3)N_(4),***,high phenol conversion(75%)is also obtained over 3DOm.Bi_(4)O_(5)Br_(2)-255 in the flow sy.tem.under full spectrum.***,3DOm.Bi_(4)O_(5)Br_(2)-255 also shows strong m.neralization capacity.owing to the downward shift of valance band position(0.15 V)as com.ared with Bi_(4)O_(5)Br_(2).Total organic carbon(TOC)rem.val rate over 3DOm.Bi_(4)O_(5)Br_(2)-255(62%)is m.ch higher than that of Bi_(4)O_(5)Br_(2)(17%).The enhancem.nt in photocataly.ic perform.nce of 3DOm.Bi_(4)O_(5)Br_(2)-255 is attributable to its better phenol adsorption,O_(2)activation,and charge separation and transfer *** work com.ines the advantages of 3D structure and surface dangling bonds,providing new possibilities for designing highly.efficient photocataly.ts for pollutants rem.val.

关键词： three-dim.nsionally.ordered m.croporous structure Bi_(4)O_(5)Br_(2) O_(2)activation photocataly.is degradation

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TWO-GRID ALGORITHm.OF H^(1)-GALERKIN m.XED FINITE ELEm.NT m.THODS FOR SEm.LINEAR PARABOLIC INTEGRO-DIFFERENTIAL EQUATIONS

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Journal of Com.utational m.them.tics 2022年第5期40卷 667-685页

作者： Tianliang Hou Chunm.i Liu Chunlei dai Luoping chen y.n y.ng School of m.them.tics and Statistics Beihua UniversityJilin 132013China College of Science Hunan University of Science and EngineeringYongzhou 425199China School of m.them.tics Southwest Jiaotong UniversityChengdu 611756China Hunan Key.Laboratory.for Com.utation and Sim.lation in Science and engineering Key Laboratory of Intelligent Computing&Information Processing of Ministry of EducationSchool of Mathematics and Computational ScienceXiangtan UniversityXiangtan 411105China

In this paper,we present a two-grid discretization schem. for sem.linear parabolic integro-differential equations by.H1-Galerkin m.xed finite elem.nt *** use the lowest order Raviart-Thom.s m.xed finite elem.nts and continuous linear finite elem.nt for spatial discretization,and backward Euler schem. for tem.oral ***,a priori error estim.tes and som. superclose properties are ***,a two-grid schem. is presented and its convergence is *** the proposed two-grid schem.,the solution of the nonlinear sy.tem.on a fine grid is reduced to the solution of the nonlinear sy.tem.on a m.ch coarser grid and the solution of two sy.0}etric and positive definite linear algebraic equations on the fine grid and the resulting solution still m.intains optim.l ***,a num.rical experim.nt is im.lem.nted to verify.theoretical results of the proposed *** theoretical and num.rical results show that the two-grid m.thod achieves the sam. convergence property.as the one-grid m.thod with the choice h=H^(2).

关键词： Sem.linear parabolic integro-differential equations H^(1)-Galerkin m.xed finite elem.nt m.thod A priori error estim.tes Two-grid Superclose.

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Autotrophic Biofilters for Oxidation of Nitric Oxide

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Chinese Journal of chemical engineering 2004年第1期12卷 113-117页

作者：陈建孟陈浚 Lance Hershm.n 王家德 Daniel P.y.Chang College of Biological and Environm.ntal engineering Zhejiang University of Technology Hangzhou 310032 China department of Civil and Environm.ntal engineering University of California Davis California 95616 USA

Carbon foam.a kind of new engineering m.terial as packing m.terial was adopted in three biofilters with different pore dim.nsions and adapted autotrophic nitrite nitrobacteria to investigate the purification of nitric oxide (NO) in a gas stream. The biofilm.was developed on the surface of carbon foam. using nitrite as its only.nitric source. The m.isture in the filter was m.intained by.ultrasonic aerosol equipm.nt which can m.nim.ze the thickness of the liquid film. The liquid phase nitrification test was conducted to determ.ne the variability.and the potential of perform.nce am.ng the three carbon foam.biofilters. The investigation showed that during the NO2^-—N inlet concentration of 200 g·L^-1·m.n^-1 to 800 g·L^-1·m.n^-1, the 24PPC (pores per centim.ter) carbon foam.biofilter had the greatest potential, achieving the NO2^-—N rem.val efficiency.of 94% to 98%. The 8PPC and 18PPC carbon foam.biofilters achieved the NO2^-—N rem.val efficiency.of 15% to 21% and of 30% to 40%, respectively. The potential for this sy.tem.to rem.ve NO from.a gas stream.was shown on the basis of a steady.rem.val efficiency.of 41% to 50% which was attained for the 24PPC carbon foam.biofilter at specified NO inlet concentration of 66.97 m.·m.-3 to 267.86m.·m.-3 and an em.ty.bed residence tim. of 3.5 m.n.

关键词： nitrification biofilter carbon foam purification of nitrogen oxides airpollution control

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High-throughput reaction engineering to assess the oxidation stability.of m.X phases

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npj Com.utational m.terials 2021年第1期7卷 20-32页

作者： D.Sauceda P.Singh A.R.Falkowski y.chen T.Doung G.Vazquez m.Radovic R.Arroy.ve department of m.terials Science & engineering Texas A&M UniversityCollege StationTX 77843USA department of m.chanical engineering Texas A&M UniversityCollege StationTX 77843USA Am.s Laboratory US Department of EnergyIowa State UniversityAmesIA50011USA

The resistance to oxidizing environm.nts exhibited by.som. m.+1AXn(m.X)phases stem. from.the form.tion of stable and protective oxide lay.rs at high operating *** m.X phases are hexagonally.arranged lay.red nitrides or carbides with general form.la m.(n+1)AX_(n),n=1,2,3,where m.is early.transition elem.nts,A is A block elem.nts,and X is C/*** attem.ts to m.del and assess oxide phase stability.in these sy.tem. has been lim.ted in scope due to higher com.utational *** address the issue,we developed a m.chine-learning driven high-throughput fram.work for the fast assessm.nt of phase stability.and oxy.en reactivity.of 211 chem.stry.m.X phase m.(2)*** proposed schem. com.ines a sure independence screening sparsify.ng operator-based m.chine-learning m.del in com.ination with grand-canonical linear program.ing to assess tem.eraturedependent Gibbs free energies,reaction products,and elem.ntal chemical activity.during the oxidation of m.X *** therm.dy.am.c stability.and chemical activity.of constituent elem.nts of Ti_(2)AlC with respect to oxy.en were fully.assessed to understand the high-tem.erature oxidation *** predictions are in good agreem.nt with oxidation experim.nts perform.d on Ti_(2)*** were also able to explain the m.tastability.of Ti_(2)SiC,which could not be sy.thesized experim.ntally.due to higher stability.of com.eting *** generality.of the proposed approach,we discuss the oxidation m.chanism.of Cr_(2)*** insights of oxidation behavior will enable m.re efficient design and accelerated discovery.of m.X phases with m.intained perform.nce in oxidizing environm.nts at high tem.eratures。

关键词： stability m.X m.intained

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Preparation of Crack-free 3y.TZP/Al_2O_3 Com.osite Ceram.c Fiber by.Electroly.is-sol-gel m.thod

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chemical Research in Chinese Universities 2007年第4期23卷 377-380页

作者： LI Jian-jun JIAO Xiu-ling chen dai-rong department of Chem.stry. Shandong University Jinan 250100 P. R. China

Poly.ry.talline 3y.TZP/Al2O3 tetragonal zirconia fiber was obtained by.the py.oly.is of gel fibers using zirconium.oxy.hloride octahy.rate（ZOC） as the raw m.terial. The spinnable zirconia sol was prepared by.electroly.ing the zirco-nium.oxy.hloride octahy.rate（ZOC） solution in the presence of acetic acid and sugar（ sucrose, glucrose or fructose） , in which the m.lar ratios of CH3 COOH/ZOC and sugar/ZOC were 1.0-4.0 and 0.2-0.4, respectively. The pre- pared tetragonal zireonia fibers sintered at different tem.eratures showed sm.oth and crack-free surfaces with diam., ters of 5-10 μm. The addition of Al2O3 enhanced the sintering process and prevented the cry.tals from.growing. Therm.gravim.tric analy.is（TG）, X-ray.diffraction （ XRD ）, Fourier transform.infrared spectroscopy.FTIR）, and scanning electron m.croscope（SEm. techniques were used to characterize the prepared fibers.

关键词： Electroly.is Sol-gel Zirconia Ceram.c fiber Al2O3

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Unveiling anneal hardening in dilute Al-doped Al_(x)CoCrFem.Ni(x = 0,0.1) high-entropy.alloy.

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Journal of m.terials Science & Technology 2021年第32期91卷 270-277页

作者： Q.cheng X.D.Xu P.Xie L.L.Han J.y.He X.Q.Li J.Zhang Z.T.Li y.P.Li B.Liu T.G.Nieh m.W.chen J.H.chen Centre for High Resolution Electron m.croscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China State Key.Laboratory.of Powder m.tallurgy Central South UniversityChangsha 410083China Applied m.terials Phy.ics Department of Materials Science and EngineeringKTH-Royal Institute of TechnologyStockholm SE10044Sweden department of m.terials Science and engineering University of TennesseeKnoxvilleTN37996United States department of m.terials Science and engineering Johns Hopkins UniversityBaltimoreMD 21214USA

Anneal hardening has been one of the approaches to im.rove m.chanical properties of solid solution alloy. with the face-centered cubic(FCC) structure,whereby.a considerable strengthening can be attained by.annealing of cold-worked alloy. below the recry.tallization tem.erature(T_(rx)).m.croscopically.this hardening effect has been ascribed to several m.chanism.,*** segregation to defects(dislocation and stacking fault) and short-range chemical ordering,***,none of these m.chanism. can well explain the anneal hardening recently.observed in phase-pure and coarse-grained FCC-structured high-entropy.alloy.(HEAs).Here we report the observations,using high-resolution electron channeling contrast im.ging and transm.ssion electron m.croscopy.of profuse and stable dislocation substructures in a cold-rolled CoCrFem.Ni HEA subject to an annealing below T_(rx).The dislocation substructures are observed to be therm.lly.stable up to T_(rx),which could arise from.the chemical com.lexity.of the high-entropy.sy.tem.where certain elem.ntal diffusion retardation *** m.crostructure feature is m.rkedly.different from.that of conventional dilute solid solution alloy.,in which dislocation substructures gradually.vanish by.recovery.during annealing,leading to a strength ***,dilute addition of 2 at.% Al leads to a reduction in both m.crohardness and y.eld strength of the cold-rolled and subsequently.annealed(≤500℃) *** Al induced softening effect,could be associated with the anisotropic form.tion of dislocation substructure,resulting from.enhanced dislocation planar slip due to glide plane softening *** findings suggest that the strength of HEAs can be tailored through the anneal hardening effect from.dislocation substructure strengthening.

关键词： Annealing hardening Dislocation substructure strengthening High-entropy.alloy Solid solution structure

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Controllable sy.thesis of NiS and NiS2 nanoplates by.chemical vapor deposition

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Nano Research 2020年第9期13卷 2506-2511页

作者： chen dai Bo Li Jia Li Bei Zhao Ruixia Wu Huifang m. Xidong Duan Hunan Key.Laboratory.of Two-Dim.nsional m.terials and State Key.Laboratory.for Chem./Biosensing and Chem.m.trics College of Chem istry and Chemical EngineeringHunan UniversityChangsha 410082China Hunan Key.Laboratory.of Two-Dim.nsional m.terials Department of Applied PhysicsSchool of Physics and ElectronicsHunan UniversityChangsha 410082China

m.litipe stoichiom.tric ratio of two-dim.nsional(2D)transition m.tal dichalcogenides(Tm.Cs)attracted considerable interest for their unique chemical and phy.ical *** we developed a chemical vapor deposition(CVD)m.thod to controllably.sy.thesize ultrathin NiS and NiS2 *** tuning the growth tem.erature and the am.unts of the sulfur powder,2D nonlay.red NiS and NiS2 nanoplates can be selectively.prepared with the thickness of 2.0 and 7.0 nm.respectively.X-ray.diffraction(XRD)and transm.ssion electron m.croscopy.TEm.characterization reveal that the 2D NiS and N1S2 nanoplates are high-quality.single cry.tals in the hexagonal and cubic phase,*** transport studies show that electrical conductivities of the 2D NiS and N1S2 nanoplates are as high as 4.6 x 10^5 and 6.3 x 10^5 S·m.-1,*** electrical results dem.nstrate that the sy.thesized m.tallic NiS and NiS2 could serve as good electrodes in 2D electronics.

关键词： two-dim.nsional(2D)non-lay.rd m.terials m.lti stoichiom.tries chemical vapor deposition nickel sulfides high conductivity

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Bioinspired Construction of Ruthenium.decorated Nitrogen-doped Graphene Aerogel as an Efficient Electrocataly.t for Hy.rogen Evolution Reaction

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chemical Research in Chinese Universities 2020年第4期36卷 709-714页

作者： SHI y. dai Wenru WANG m.ng XING y.ngfang XIA Xinghua chen Wei department of Chem.stry National University of Singapore3 Science Drive 3117543Singapore State Key.Laboratory.of Analy.ical Chem.stry.for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023P.R.China National University.of Singapore(Suzhou)Research Institute Suzhou 215123P.R.China Joint School of National University.of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207P.R.China department of Phy.ics National University of Singapore117542Singapore

Rational construction of low-cost,efficient,and durable electrocataly.ts for the hy.rogen evolution reac-tion(HER)is essential to further develop water electroly.is *** by.the natural enzy.0} cataly.is with coordination environm.nts of catalvtic sites and three-dim.nsional *** construct an efficient Ru-based cataly.t anchored on the nitrogen dopant on graphene aerogel(Ru-NGA).The Ru-NGA cataly.t exhibits dram.tically.im.roved electroactivity.and stability.towards HER with a near-zero onset overpotential,a low Tafel slope of 32m.idec,and a high turnover frequency.of 5.5 s^-1 at-100 *** results show that the electronic m.dulation of m.tallic Ru nanoparticles by.nitrogen coordination weakens the affinity.of Ru towards H and hence facilitates the *** of *** research provides in-depth insights into the fundam.ntal relationship between m.tallic nanostructure and HER activity.and also guides the rational design of high-perform.nce electrocataly.ts in energy.conversion.

关键词： Ruthenium Graphene aerogel Hy.rogen evolution reaction Electronic m.dulation Electrocataly.is

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Cellulose nanofiber separator for suppressing shuttle effect and Li dendrite form.tion in lithium.sulfur batteries

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Journal of Energy.Chem.stry 2022年第4期31卷 736-744页

作者： Jingxue Li Liqin dai Zhefan Wang Hao Wang Lijing Xie Jingpeng chen Chong y.n Hong y.an Hongliang Wang chengm.ng chen Center of Biom.ss engineering/College of Agronom. and Biotechnology China Agricultural UniversityBeijing 100193China CAS Key.Laboratory.of Carbon m.terials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina Beijing Key.Laboratory.of Green chemical Reaction engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of m.ltidisciplinary.Science Beijing Institute of TechnologyBeijing 100081China University.of Chinese Academ. of Sciences Beijing 100049China

Lithium.sulfur battery.LSB) has high energy.density.but is lim.ted by.the poly.ulfides shuttle and dendrite growth during cy.ling. Herein, a free-standing cellulose nanofiber(CNF) separator is designed and fabricated in isopropanol/water suspension through vacuum.filtration progress. CNFs with abundant polar oxy.en-containing functional groups can chemically.im.obilize the poly.ulfides, and suppress the form.tion of the dendrites by.controlling the surface m.rphology.of the SEI on lithium.m.tal in LSB. The isopropanol content in a suspension can fine-tune the pore structure of the m.m.rane to achieve optim.l electrochemical perform.nce. The prepared separator display. integrated advantages of an ultrathin thickness(19 μm., lightweight(0.87 m. cm.(-2)), extrem.ly.high porosity.98.05%), and decent electroly.e affinity. As a result, the discharge capacity.of the LSB with CNF separator at the first and 100 th cy.le is 1.4 and 1.3 tim.s that of PP separator, respectively. Our research provides an environm.ntalfriendly.and facile strategy.for the preparation of m.ltifunctional separators for LSBs.

关键词： Cellulose Separator Lithium.sulfur battery Shuttle effect Growth of dendrite

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He-enhanced heterogeneity.of radiation-induced segregation in FeNiCoCr high-entropy.alloy

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Journal of m.terials Science & Technology 2022年第6期101卷 226-233页

作者： W.T.Lin G.m.y.li G.Wang J.H.Lin S.J.Zhao D.chen S.F.Liu F.L.m.ng y.R.Li F.He y.Lu J.J.Kai department of m.chanical engineering City University of Hong KongHong KongChina Institute of Nuclear&New Energy.Technology Tsinghua UniversityBeijingChina department of Phy.ics Southern University of Science and TechnologyShenzhenChina Centre for Advanced Nuclear Safety.and Sustainable Developm.nt City University of Hong KongHong KongChina School of Environm.ntal Science and engineering Southern University of Science and TechnologyShenzhenChina School of m.terials Science and engineering Shanghai UniversityShanghaiChina Nano-m.nufacturing Laboratory.Nm.) City University of Hong Kong Shenzhen Research InstituteShenzhenChina

Radiation-induced segregation(RIS) is a ty.ical non-equilibrium.process that can dram.tically.alter the behavior of defect sinks and m.terial properties under irradiation. However, RIS m.chanism. have been rarely.studied around sm.ll He bubbles owing to the technical challenges involved in direct m.asurem.nts of local chem.stry. Here, using state-of-the-art atom.probe tom.graphy. we report the RIS behavior near He bubbles in the Fe Ni Co Cr high-entropy.alloy.that indicates Co segregates m.st strongly. followed by.weaker Ni segregation, whereas Fe and Cr are depleted alm.st to the sam. degree. Exceptionally. the m.gnitude of Co segregation around He bubbles is higher than previously.m.asured values at voids and dislocation loops. Electron energy.loss spectroscopy.was used to m.asure the He density.and pressure inside individual bubbles. We dem.nstrate that He bubbles are over-pressurized at the irradiation tem.erature that could result in the vacancy.bias and the subsequent vacancy.dom.nated RIS ***-principles calculations further reveal that there are repulsive interactions between He and Co atom. that m.y.reduce the frequency.of Co-vacancy.exchange. As a result, He atom. likely.retard Co diffusion via the vacancy.m.chanism.and enhance the heterogeneity.of RIS in Co-containing m.lticom.onent alloy.. These insights could provide the basis for understanding He effects in nuclear m.terials and open an avenue for tailoring the local chemical order of m.dium.and high-entropy.alloy..

关键词： High-entropy.alloy Radiation-induced segregation He bubbles Atom.probe tom.graphy Electron energy.loss spectroscopy

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