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Flat Zn depositi.n at battery anode via an ultrathin robust interlayer

nano Research 2024年第9期17卷 8104-8111页

作者： Yizhou Wang Jianyu Chen Zibo Chen qian He Zhengnan ti.n Jin Zhao Yanwen Ma Husam n.Alshareef Materials Science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia State Key Laboratory of Organic Electronics and Informati.n Displays(KLOEID)and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Suzhou Vocati.nal Institute of Industrial Technology Suzhou 215104China

Rechargeable aqueous zinc(Zn)ion batteries(AZIBs)using low-cost and safe Zn metal anodes are considered promising candidates for future grid-scale energy storage systems,but the Zn dendrite problem severely hinders the further prospects of *** Zn depositing behaviors toward horizontal alignment is highly effective and thus has received huge ***,such a strategy is usually based on previous substrate engineering,which requires complex preparati.n or expensive ***,it is essential to develop a novel soluti.n that can realize horizontally aligned Zn flake depositi.n via easy operati.n and low ***,we report an ultrathin and robust Kevlar membrane as the interlayer to mechanically suppress Zn dendrite *** to the randomly distributed flaky dendrites in the control group,the deposited Zn sheets would grow into parallel alignment with the existence of such *** the dendrites are effectively suppressed,Zn||Cu asymmetric,Zn||Zn symmetric,and Zn||MnO_(2)full batteries using Kevlar interlayer deliver significantly improved cycling ***,the Zn||MnO_(2)pouch cell using a Kevlar interlayer delivers stable cycling performance and shows stable operati.n during multi-angle *** believe this work provides a new possibility for regulating Zn depositi.n from a crystallographic perspective.

关键词： Zn metal anodes Zn dendrites aqueous Zn ion batteries dendrite suppression (002)crystal plane

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Recent progress in MnBi2nTe3n+1 intrinsic magnetic topological insulators: crystal growth, magnetism and chemical disorder

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nati.nal Science Review 2024年第2期11卷 65-80页

作者： Chaowei Hu tiema qian ni ni Department of Physics and Astronomy and California nano Systems Institute University of California-Los Angeles

The search for magnetic topological materials has been at the forefront of condensed matter research for their potential to host exotic states such as axion insulators, magnetic Weyl semimetals, Chern insulators,etc. To date, the MnBi2nTe3n+1family is the only group of materials showcasing van der Waals-layered structures, intrinsic magnetism and non-trivial band topology without trivial bands at the Fermi level. The interplay between magnetism and band topology in this family has led to the proposal of various topological phenomena, including the quantum anomalous Hall effect, quantum spin Hall effect and quantum magnetoelectric effect. Among these, the quantum anomalous Hall effect has been experimentally observed at record-high temperatures, highlighting the unprecedented potential of this family of materials in fundamental science and technological innovati.n. In this paper, we provide a comprehensive review of the research progress in this intrinsic magnetic topological insulator family, with a focus on single-crystal growth, characterizati.n of chemical disorder, manipulati.n of magnetism through chemical substituti.n and external pressure, and important questi.ns that remain to be conclusively answered.

关键词： MnBi2Te4 magnetic topological insulator magnetism tuning antiferromagnetism ferromagnetism pressure chemical doping

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Existence and asymptotics of normalized soluti.ns for the logarithmic Schrödinger system

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Science China Mathematics 2024年第9期67卷 2019-2048页

作者： qian Zhang Wenming Zou Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China

This paper is concerned with the following logarithmic Schrodinger system:{-Δu_(1)+ω_(1)u_(1)=u_(1)u_(1)logu_(1)^(2)+2p/p+q|u_(2)|^(q)|u_(1)|^(p-2)u_(1),-Δu_(2)+ω_(2)u_(2)=u_(2)u_(2)log u_(2)^(2)+2q/p+q|u_(1)|^(p)|u_(2)|^(q-2)u_(2),∫_(Ω)|u_(i)|^(2)dx=ρ_(i),i=1,2,(u_(1),u_(2))∈H_(0)^(1)(Ω;R^(2)),where Ω=R^(n)or Ω■R^(n)(n≥3)is a bounded smooth domain,andω_(i)R,μ_(i),ρ_(i)>0 for i=1,***,p,q≥1,and 2≤p+q≤2^(*),where 2^(*):=2n/*** using a Gagliardo-nirenberg inequality and a careful estimati.n of u log u^(2),firstly,we provide a unified proof of the existence of the normalized ground state soluti.n for all 2≤p+q≤2^(*).Secondly,we consider the stability of normalized ground state ***,we analyze the behavior of soluti.ns for the Sobolev-subcritical case and pass to the limit as the exponent p+q approaches 2^(*).notably,the uncertainty of the sign of u log u^(2)in(0,+∞)is one of the difficulties of this paper,and also one of the motivati.ns we are interested *** particular,we can establish the existence of positive normalized ground state soluti.ns for the Brézis-nirenberg type problem with logarithmic perturbati.ns(i.e.,p+q=2^(*)).In additi.n,our study includes proving the existence of soluti.ns to the logarithmic type Bréis-nirenberg problem with and without the L^(2)-*** ∫_(Ω)|u_(i)|^(2)dx=ρ_(i)(i=1,2)by two different methods,*** results seem to be the first result of the normalized soluti.n of the coupled nonlinear Schrodinger system with logarithmic perturbati.ns.

关键词： logarithmic Schrodinger system Brézis-nirenberg problem normalized soluti.n existence and stability behavior of soluti.ns

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The homogenous growth of Co-based coordinati.n compound on graphene nanosheet for high-performance K-organic battery and its reacti.n mechanism

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Rare Metals 2024年第4期43卷 1622-1634页

作者： qian-qian Peng Yi-ting Wang Shuo Qi Yao Xiao Yong Wang Shuang-qiang Chen School of Environmental and Chemical Engineering Shanghai UniversityShanghai200444China School of Chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China

Metal coordinati.n compounds(MCCs)are gaining popularity for potassium-ion batteries(PIBs)owing to their tuneable structure,multiple reacti.n sites,low cost and unique ***,they are generally subjected to intrinsic features of the sluggish ionic diffusion coefficient,low electronic conductivity and slow ***,a new MCC material of cobalt-1,3,5-trioxy-2,4,6-triamino-benzo(Co-TB)coordinati.n compound was synthesized and homogenously grown on the surface of graphene nanosheets(GnS),forming a Co-TB@GnS composite with enhanced electronic conductivity and flexible *** from the overall enhanced conductivity,high surface area and abundant activated K-storage sites,Co-TB@GnS electrodes have exhibited superior cycling performance with high reversible capacities(312 mAh·g^(-1)after 100 cycles at 100 mA·g^(-1),224 mAh·g^(-1)after 500 cycles at 1 A·g^(-1))and better rate performances compared with the pure Co-TB compound when served as PIB's ***,multiple in-situ measurement techniques have jointly confirmed that the organic functi.nal groups(C=O,C=n and C=C of benzene rings)and Co^(2+)in Co-TB are the main reversible K-storage sites,including in-situ Fourier transform infrared spectroscopy(FtiR)and X-ray diffracti.n(XRD),and partial capacity contributi.n is originated from GnS by the apparent K-storage behavior in the in-situ XRD pattern,proving the possibility of K-storage for metal-organic materials.

关键词： Metal coordinati.n compounds Potassiumion battery Cobalt coordinati.n compound K-storage mechanism

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Selective n-Methylati.n of n-Methylaniline with CO_(2) and H_(2) over Cu/In_(2)O_(3) Catalyst

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Chinese Journal of Chemistry 2024年第3期42卷 276-282页

作者： Huan Zheng Bo qian Lin He State Key Laboratory for Oxo Synthesis and Selective Oxidati.n Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouGansu730000 China University of Chinese Academy of Sciences Beijing100049 China

n-Methylati.n of amines with CO_(2) and H2 is a potential approach for CO_(2) utilizati.n because n-methylated amines can be used as solvents and organic intermediates. In_(2)O_(3)-supported Cu (Cu/In_(2)O_(3)) acts as an effective heterogeneous catalyst for n-methylati.n reacti.n of n-methylaniline (MA) with CO_(2) and H_(2),showing higher n,n-dimethylaniline (DMA) selectivity than other supported Cu catalysts. On one hand,the dispersion of Cu can be improved by the defective In_(2)O_(3) support. On the other hand,In_(2)O_(3) support is active in the dissociative adsorpti.n of CO_(2) through C—O bond breaking. In additi.n,the H_(2) dissociati.n ability of In_(2)O_(3) can also be enhanced by Cu. The combinati.n of Cu and In_(2)O_(3) is effective in the activati.n of CO_(2),the adsorpti.n of intermediate n-methylformanilide (MFA),the hydrogenati.n of MFA to DMA and the prohibiti.n of C—n bond cleavage side reacti.ns,thereby enhancing the reacti.n rate of MA conversion and the selectivity to DMA.

关键词： n-Methylati.n CO_(2) Cu/In_(2)O_(3) Supported catalysts Heterogeneous catalysis

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Experimental distillati.n of tripartite quantum steering with an optimal local filtering operati.n

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Photonics Research 2024年第3期12卷 552-562页

作者： qian-XI ZHAnG XIAO-XU FAnG HE LU School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Shenzhen Research Institute of Shandong University Shenzhen 518057China

Multipartite Einstein-Podolsky-Rosen(EPR)steering admits multipartite entanglement in the presence of uncharacterized verifiers,enabling practical applicati.ns in semi-device-independent *** applicati.ns generally require stronger steerability,while the unavoidable noise weakens steerability and consequently degrades the performance of quantum informati.n ***,we propose the local filtering operati.n that can maximally distill genuine tripartite EPR steering from n copies of three-qubit generalized Greenberger-Horne-Zeilinger states,in the context of two semi-device-independent *** optimal filtering operati.n is determined by the maximizati.n of assemblage *** and numerical results indicate the advantage of the proposed filtering operati.n when n is finite and the steerability of initial assemblages is ***,a proof-of-principle demonstrati.n of two-copy distillati.n is realized with the optical *** advantage of the optimal local filtering operati.n is confirmed by the distilled assemblage in terms of higher assemblage fidelity with perfectly genuine tripartite steerable assemblages,as well as the greater violati.n of the inequality to witness genuine tripartite steerable *** results benefit the distillati.n of multipartite EPR steering in practice,where the number of copies of initial assemblages is generally finite.

关键词： filtering distillati.n optimal

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Direct Conversion of Methane to Propylene

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Research 2024年第2期2023卷 463-472页

作者： Yunpeng Hou Yuxiang Lan Chao qian Shaodong Zhou College of Chemical and Biological Engineering Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyZhejiang University310027 HangzhouP.R.China Zhejiang Provincial Innovati.n Center of Advanced Chemicals Technology Institute of Zhejiang University-Quzhou324000 QuzhouP.R.China

nonoxidative coupling of methane exhibits promising prospect in that it affords value-added hydrocarbons and hydrogen with high atom ***,challenge remains in direct,selective conversion of methane to more valuable hydrocarbons like *** current work presents a catalyst with well-dispersed Ta atoms anchored by graphitic C_(3)n_(4)-supported *** a catalyst is able to convert methane selectively to ethylene and propylene at a relatively low temperature(350℃).The concepti.n of the active center and constructi.n of the catalyst have been described,and the origins of the catalytic performance are discussed.

关键词： methane catalyst hydrocarbons

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Preparati.n of K-doped g-C_(3)n_(4) composite loaded on magnetic attapulgite and its degradati.n performance for malachite green

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Chinese Journal of Chemical Engineering 2024年第7期71卷 110-121页

作者： Aishun Ma Hanlin qian Hongxia Liu Sili Ren Jiangxi Key Laboratory of Mining&Metallurgy Environmental Polluti.n Control Jiangxi University of Science and TechnologyGanzhou 341000China Jiangxi Provincial Key Laboratory of Low-Carbon Processing and Utilizati.n of Strategic Metal Mineral Resources Jiangxi University of Science and TechnologyGanzhou 341000China

Visible-light-driven photocatalysis is a promising technology for the treatment of dye *** this work,a novel photocatalyst of K-doped g-C_(3)n_(4) loaded on magnetic attapulgite(ATP)(Kω-g-C_(3)n_(4)@ATP-Fe_(3)O_(4))with excellent visible light photocatalytic properties and stability were successfully prepared and *** removal efficiency of Kω-g-C_(3)n_(4)@ATP-Fe_(3)O_(4) for malachite green(MG)was studied,and the degradati.n mechanism was analyzed and *** was found that the K_(5)-g-C_(3)n_(4)@ATP-Fe_(3)O_(4) photocatalyst possessed excellent degradati.n efficiency of over 98.0%for the MG dye wastewater under optimal ***,the K_(5)-g-C_(3)n_(4)@ATP-Fe_(3)O_(4) materials possessed good recyclability with a removal rate over 82%after 4 *** visible light conditi.n,the K_(5)-g-C_(3)n_(4)@ATP-Fe_(3)O_(4) photocatalyst produce radicals of·OH and O_(2)^(-)to degrade the MG dyes,which was supported by electron paramagnetic resonance(EPR)and radical trapping *** additi.n,the LC-MS analysis interpreted the degradati.n pathways and intermediates of MG in the *** findings in this work indicate that the prepared photocatalytic material has excellent degradati.n efficiency for MG and can be applied in dye wastewater treatment.

关键词： Photocatalyst Malachite green K-doped g-C_(3)n_(4) Degradati.n

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Highly efficient photocatalytic conversion of CO_(2) into CH_(4) over Cu single atom promoted heterojuncti.n:The effect of uplifted d-band center

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Chinese Chemical Letters 2024年第2期35卷 484-488页

作者： Hao Zhang qian Liu Zhurui Shen School of Materials Science and Engineering Nankai UniversityTianjin 300350China

Photoreducti.n of CO_(2) to solar fuels has caused great interest,but suffers from low catalytic efficiency and poor ***,we designed a S-scheme heterojuncti.n(Cu-tiO_(2)/WO_(3))with Cu single atom to significantly boost the photoreducti.n of CO_(2).notably,the developed Cu-tiO_(2)/WO_(3) achieved the solardriven conversion of CO_(2) to CH_(4) with an evoluti.n rate of 98.69μmol g^(−1) h^(−1),and the electron selectivity of CH_(4) reached 88.5%.The yield was much higher than those of pristine WO_(3),tiO_(2)/WO_(3) and Cu-tiO_(2) *** and theoretical analysis suggested that the S-scheme heterojuncti.n accelerated charge migrati.n and inhibited the recombinati.n of electron-hole ***,the charge separati.n effect of the heterojuncti.n meliorated the positi.n of the *** uplifted d-band centers of Cu and ti on Cu-tiO_(2)/WO_(3) not only improved the electron interacti.n between Cu single atoms and substrate-tiO_(2),accelerated the adsorpti.n and activati.n of CO_(2) on the active sites of Cu single atom,but also optimized the Gibbs free energies of CH 4 formati.n pathway,leading to excellent selectivity toward CH_(4).This work provides new insights into the design of photocatalyst systems with high photocatalytic performance.

关键词： Cu single atom Heterojuncti.n CO_(2)photoreducti.n d-band center DFT

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Combined effect of WS_(2) and ti_(3)C_(2)T_(x) MXene favors oil-based ultra-low fricti.n on rough steel-steel interface at elevated temperatures

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Science China(Technological Sciences) 2024年第7期67卷 1991-2002页

作者： LIU YangQin CHEn Lei WAnG Yang qian LinMao Tribology Research Institute State Key Laboratory of Rail Transit Vehicle SystemSchool of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China Key Laboratory of Advanced Technologies of Materials(Ministry of Educati.n) Research Institute of Frontier ScienceSouthwest Jiaotong UniversityChengdu 610031China

The lubricati.n performance of liquids is severely restricted and is degraded in high-temperature environments. Stable and reliable lubricati.n in high temperature environments has been a long-standing goal in various industrial fields. In this study,WS_(2)and ti_(3)C_(2)T_(x)MXene nanoflakes were used as oil-based lubricant additives to generate ultra-low fricti.n and even superlubricity(fricti.n coefficient of ~0.007) at elevated temperatures(400℃), which has hitherto not been achieved by both individual pristine materials, WS_(2)and ti_(3)C_(2)T_(x)MXene. Viscosity and thermogravimetric characterizati.n revealed improvements in the high-temperature rheological properties and thermal stability of the lubricating base oil, indicating improved loadbearing and continuous lubricati.n capabilities at elevated temperatures. X-ray photoelectron spectroscopy, transmission electron microscopy, and atomic force microscopy demonstrated that the formati.n of an iron/titanium/tungsten-rich oxide lubricious thin film at the sliding interface reduced the interfacial shear stress, which was responsible for the observed fricti.n and wear reducti.ns at high contact pressures(> 1.1 GPa). Although the titanium/tungsten oxide film was gradually removed after prolonged sliding, a sufficiently thick iron oxide film maintained a low fricti.n coefficient for at least 2 h. The improved surface quality facilitates the achievement of ultra-low fricti.n and reduced wear. The proposed lubricati.n methodology has a broad utilizati.n potential as a wear-reducti.n strategy across various industrial fields at elevated temperatures.

关键词： ultra-low fricti.n high-temperature wear reducti.n lubricating additive tungsten disulfide MXene

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