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Dual-Defect Engineering Strategy Enables High-Durability Rechargeable Magnesium-Metal Batteries

Nano-Micro Letters 2024年第9期16卷 449-461页

作者： Fuyu Chen Bai‑Qing Zhao Kaifeng Huang xiu‑fen Ma Hong‑Yi li Xie Zhang Jiang Diao Jili Yue Guangsheng Huang Jingfeng Wang Fusheng Pan National Innovation Center for Lndustry‑Education Integration of Energy Storage Technology School of Materials Science and EngineeringChongqing UniversityChongqing 400044People’s Republic of China National Magnesium Alloy Material Engineering Technology Research Center Chongqing UniversityChongqing 400044People’s Republic of China Materials and Energy Division Beijing Computational Science Research CenterBeijing 100193People’s Republic of China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044People’s Republic of China

Rechargeable magnesium-metal batteries(RMMBs)are promising next-generation secondary batteries;however,their development is inhibited by the low capacity and short cycle lifespan of *** various strategies have been devised to enhance the Mg^(2+)migration kinetics and structural stability of cathodes,they fail to improve electronic conductivity,rendering the cathodes incompatible with magnesium-metal ***,we propose a dual-defect engineering strategy,namely,the incorporation of Mg^(2+)pre-intercalation defect(P-Mgd)and oxygen defect(Od),to simultaneously improve the Mg^(2+)migration kinetics,structural stability,and electronic conductivity of the cathodes of *** lamellar V_(2)O_(5)·nH_(2)O as a demo cathode material,we prepare a cathode comprising Mg_(0.07)V_(2)O_(5)·1.4H_(2)O nanobelts composited with reduced graphene oxide(MVOH/rGO)with P-Mgd and *** Od enlarges interlayer spacing,accelerates Mg^(2+)migration kinetics,and prevents structural collapse,while the P-Mgd stabilizes the lamellar structure and increases electronic ***,the MVOH/rGO cathode exhibits a high capacity of 197 mAh g^(−1),and the developed Mg foil//MVOH/rGO full cell demonstrates an incredible lifespan of 850 cycles at 0.1 A g^(−1),capable of powering a light-emitting *** proposed dual-defect engineering strategy provides new insights into developing high-durability,high-capacity cathodes,advancing the practical application of RMMBs,and other new secondary batteries.

关键词： Rechargeable magnesium-metal batteries Dual-defect engineering Vanadium-based cathode High durability Lamellar structure

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The Bipolar Quantum Drift-diffusion Model

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Acta Mathematica Sinica,English Series 2009年第4期25卷 617-638页

作者： xiu Qing CHEN li CHEN School of Sciences Beijing University of Pos~s and Telecommunications Beijing 100876 P. R. China Department of Mathematical Sciences Tsinghua University Beijing 100084 P. R. China

A fourth order parabolic system, the bipolar quantum drift-diffusion model in semiconductor simulation, with physically motivated Dirichlet-Neumann boundary condition is studied in this paper. By semidiscretization in time and compactness argument, the global existence and semiclassical limit are obtained, in which semiclassieal limit describes the relation between quantum and classical drift-diffusion models, Furthermore, in the case of constant doping, we prove the weak solution exponentially approaches its constant steady state as time increases to infinity.

关键词： quantum drift-diffusion fourth order parabolic system weak solution semiclassical limit,exponential decay

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Derivations and Automorphisms of the Positive Part of the Two-parameter Quantum Group U_(r,s)(B_3)

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Acta Mathematica Sinica,English Series 2017年第2期33卷 235-251页

作者： Min li xiu ling WANG School of Sciences Tianjin University of Science and Technology School of Mathematical Sciences and LPMC Nankai University

We compute the derivations of the positive part of the two-parameter quantum group Ur,s（B3） and show that the Hochschild cohomology group of degree 1 of this algebra is a three- dimensional vector space over the base field C. We also compute the groups of （Hopf） algebra automorphisms of the augmented two-parameter quantized enveloping algebra Ur,s（B3）.

关键词： Two-parameter quantum group ore extension hochschild cohomology group (Hopf) al- gebra automorphism

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Substitution effects on the hydrogen storage behavior of AB2 alloys by first principles

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Frontiers of physics 2011年第2期6卷 214-219页

作者： fen li Ji-jun ZHAO li-xian SUN Key Laboratory of Materials Modification by Laser Ion and Electron Beams （Dalian University of Technology） Ministry of Education Dalian 116024 China College of Advanced Science and Technology Dalian University of Technology Dalian 116024 China Materials and Thermochemistry Laboratory Dalian Institute of Chemical Physics Dalian 1160237 China

The hydrogen storage behavior of the TiCr2 and ZrCr2 alloys substituted with the third components （Zr, V, Fe, Ni） have been studied using first-principles calculations. The change of the hydrogen absorption energies caused by metal doping is arising from the charge transfer among the doped alloys interior. Zr and V atoms devoted abundant electrons, leading to a great enhancement of the H absorption energy, while Fe and Ni atoms always accepted electrons, yielding a remarkable decrease of the H absorption energy. The hydrogen diffusion energy barrier is closely correlated with the geometry effect rather than the electronic structure.

关键词： alloy hydrogen storage doping first-principles

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FVS SCHEME FOR SEVERE TRANSIENT FLOW IN PIPE NETWORKS

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Journal of Hydrodynamics 2005年第5期17卷 621-628页

作者： GENG Yan-fen WANG Zhi-li JIN Sheng State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian116024 China Nanjing Hydraulic Research Institute Nanjing 210024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China

An efficient numerical method with first and second order accuracy is developed by the flux split technology to simulate the water hammer problem in single and multiple pipe networks under severe transient conditions. The finite volume formulation ensures that both schemes conserve mass and momentum and produces physically realizable shock fronts. The conception of the fictitious cell at the junction is developed. The typical water hammer problem and the experi ment with friction and the comprehensive orbicular network with control valve and pressure relief valve and surge tank are implemented to test the numerical method. Strong numerical evidences show that the proposed scheme has several desirable properties, such as, accurate, efficient, robust, high shock resolution, conservative and stable for Courant number.

关键词： pipe networks water hammer flux vector splitting fictitious cell finite volume method

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Synthesis and Anti-inflammatory Action of (η-C_5H_5)_2Ti(Sal)_2 and (η-C_5H_5)_2Ti(Clo)_2

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Chemical Research in Chinese Universities 2006年第1期22卷 6-10页

作者： li xiu-juan ZENG Zheng-zhi College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China

Two new complexes （Cp）2Ti （Sal）2 and（Cp）2Ti（Clo）2 （Cp=Cyclopentadienyl η^5-C5H5 ）, have been synthesized in anhydrous THF by the reaction of HSal（o-hydroxybenzoic acid, salicylate acid） or HClo[N-（ m-chloro-phenyl） anthranili acid, acidum clofenamicum] with （Cp）2TiCl2 and characterized by means of elemental analyses, IR, H NMR, ^13C NMR, UV and molar conductivity. In complex （Cp）2Ti（Sal）2 or（Cp）2Ti（Clo）2, the oxygen atom of the carboxyl group coordinates to Ti（Ⅳ） in a monodentate manner. The inhibitory action of the complexes on mouse ear tumefaction caused by croton oil and rat foot granulation growth caused by cotton balls is higher than that of the corresponding ligands HSal, HClo and [ （Cp）2TiCl2 ], whereas their toxicity is lower than those of the free ligands.

关键词： Salicylate acid N-(m-Chlorophenyl) anthranilic acid Cyclopentadienyltitanium complexes Anti-in-flammatory

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Mechanism of oxidation of low rank coal by nitric acid

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Journal of Coal Science & Engineering(China) 2012年第4期18卷 396-399页

作者： SHI Kai-yi TAO xiu-xiang HONG fen-fen HE Huan JI Yong-hua li Ji-lan Department of Chemistry and Chemical Engineering Liupanshui Normal UniversityLiupanshui 553004China School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221008China

The pretreatment of low rank coal with nitric acid oxidation can promote its bio-liquefaction. However, the detailed mechanism of which remains an unresolved problem. In the present work, the characteristics of Fushun coal before and after oxidation by nitric acid were investigated combined with elemental composition, pore volume and pore size, Zeta potential, FT-IR, and 13C solid NMR spectrum analysis. The results show that the inorganic substance inlaid in coal are dissolved by ni- tric acid, which results in the decrease of coal ash content and increase of pore volume and pore size. Furthermore, there exist obvious chemical reactions between nitric acid and the functional groups of coal including aromatic ring carboxylation, side chain alkyl of aromatic ring oxidation and aromatic ring nitration. Among these reactions, some led to the increase in content of carboxyl, aliphatic carbon connected with O and humic acid carbon, while others caused the reduction of aromaticity, methyl carbon, substituted aryl carbon and side chain.

关键词： oxidation low rank coal nitric acid mechanism

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Effects of nitrogen dioxide and its acid mist on reactive oxygen species production and antioxidant enzyme activity in Arabidopsis plants

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Journal of Environmental Sciences 2015年第8期27卷 93-99页

作者： Xiaofang liu fen Hou Guangke li Nan Sang College of Environment and Resource Research Center of Environment and Health Shanxi University College of Environmental Science and Engineering Nankai University

Nitrogen dioxide（NO2） is one of the most common and harmful air pollutants. To analyze the response of plants to NO2 stress, we investigated the morphological change, reactive oxygen species（ROS） production and antioxidant enzyme activity in Arabidopsis thaliana（Col-0） exposed to 1.7, 4, 8.5, and 18.8 mg/m3NO2. The results indicate that NO2 exposure affected plant growth and chlorophyll（Chl） content, and increased oxygen free radical（O2-）production rate in Arabidopsis shoots. Furthermore, NO2 elevated the levels of lipid peroxidation and protein oxidation, accompanied by the induction of antioxidant enzyme activities and change of ascorbate（As A） and glutathione（GSH） contents. Following this, we mimicked nitric acid mist under experimental conditions, and confirmed the antioxidant mechanism of the plant to the stress. Our results imply that NO2 and its acid mist caused pollution risk to plant systems. During the process, increased ROS acted as a signal to induce a defense response, and antioxidant status played an important role in plant protection against NO2/nitric acid mist-caused oxidative damage.

关键词： Nitrogen dioxide Nitric acid mist Arabidopsis thaliana Reactive oxygen species Antioxidant system

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A Finite Difference Scheme for Solving the Undamped Timoshenko Beam Equations with Both Ends Free

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 691-704页

作者： Fu-le li Zong-hu xiu College of Science and Information Qingdao Agricultural University

In this paper, a boundary feedback system of a class of non-uniform undamped Timoshenko beam with both ends free is considered. A linearized three-level difference scheme for the Timoshenko beam equations is derived by the method of reduction of order on uniform meshes. The unique solvability, unconditional stability and convergence of the difference scheme are proved by the discrete energy method. The convergence order in maximum norm is of order two in both space and time. The validity of this theoretical analysis is verified experimentally.

关键词： Timoshenko beam nonhomogeneous undamped partial differential equation finite difference

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PAHs in aquatic sediment in Hangzhou, China: Analytical methods, pollution pattern, risk assessment and sources

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Journal of Environmental Sciences 2005年第5期17卷 748-755页

作者： ZHU li-zhong CAI Xue-fen WANG Jing Department of Environmental Science Zhejiang University Hangzhou 310028 China Women＇s Hospital School of Medicine Zhejiang University Hangzhou 310006 China Zhejiang Provincial Environmental Monitoring Centre Hangzhou 310012 China

Eleven surface sediment samples, from Hangzhou section of Qiantang River and Jinghang Canal, west Lake the inland river were collected to investigate 17 polycycUc aromatic hydrocarbons（PAHs） pollution in aquatic sediments of Hangzhou. Accelerated solvent extraction（ASE） was used to extract PAHs from sediments with satisfactory recoveries. It was found that the total PAHs in the sediments ranged from 308.4 to 3037 ng/g dw, and PAHs pollution in sediments from Jinghang Canal were the heaviest. Lowest effect level（LEL） and severe effect level （SEL） sediment quality guidelines were introduced to perform risk assessment for PAHs pollution in aquatic sediments. Only one sample in Jinghang Canal had adverse impact on benthic organism. 2-3 ring PAHs had a noticeable contribution to total PAHs, especially NA, PHEN. A quantity method was used to determine the major source, the results showed petroleum origin was the chief source to PAHs pollution in all sediments with the exception of sediments from Jinghang Canal where combustion sources had a larger contribution.

关键词： PAHs ASE sediment source risk assessment

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