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Additives to propylene carbonate-based electrolytes for lithium-ion capacitors

Rare Metals 2022年第4期41卷 1304-1313页

作者： Peng-Lei Wang xian-Zhong Sun Ya-Bin An Xiong Zhang Chang-Zhou yuan Shuang-hao Zheng Kai Wang Yan-Wei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan 250013China School of Materials Science&Engineering University of JinanJinan 250022China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

Nowadays,lithium-ion capacitors(LICs) have become a type of important electrochemical energy storage devices due to their high power and long cycle life characteristics with fast response *** one of the essential components of LICs,the electrolytes not only provide the anions and cations required during charge and discharge processes,but also supply the liquid environment for ions to migrate between anodes and cathodes in LIC *** is well accepted that propylene carbonate(PC) cannot be used as a single solvent for Li-ion electrolyte due to the failure to form stable SEI film on graphite *** this work,the compatibility of PC-based electrolyte with commercial soft carbon anode and activated carbon cathode has been validated by using the laminated pouch LIC *** effects of additives on the electrochemical properties of PC-based LICs have been systematically *** sulfite(ES) was proved to be an effective additive to promote capacity retention at high C-rate,which is superior to vinylene carbonate and fluoroethylene *** addition of 5 wt% ES plays an important role in reducing internal resistance,as well as improving electrochemical stability and low-temperature *** study is expected to be beneficial to explore robust electrolyte/additive combinations for LICs to reduce the internal resistance and to improve the lowtemperature performances.

关键词： Lithium-ion capacitors Propylene carbonate Li-ion electrolyte Ethylene sulfite Fluoroethylene carbonate Lithium bis(fluorosulfonyl)imide

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Some Results Associated with the Longest Run in a Strongly Ergodic Markov Chain

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Acta Mathematica Sinica,English Series 2013年第10期29卷 1939-1948页

作者： Ya Zhe ZHANG xian yuan WU School of Mathematical Sciences Capital Normal University

This paper discusses the asymptotic behaviors of the longest run on a countable state Markov chain. Let {Xa}a∈Z＋ be a stationary strongly ergodic reversible Markov chain on countable- state space S = {1, 2,...}. Let T C S be an arbitrary finite subset of S. Denote by Ln the length of the longest run of consecutive i＇s for i E T, that occurs in the sequence X1,..., Xn. In this paper, we obtain a limit law and a week version of an Erd6s Rdnyi type law for Ln. A large deviation result of Ln is also discussed.

关键词： Longest run Stein-Chen method Poisson approximation

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Oviposition preference, larval performance and adaptation of Trichoplusia ni on cabbage and cotton

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Insect Science 2015年第2期22卷 273-282页

作者： yuan-Xi Li Tong-xian Liu Department of Entomology College of Plant Protection Nanjing Agricultural University Nanjing State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Crop IPM for the Loess Plateau Ministry of Agriculture of China at Northwest A&F University Yangling Shaanxi China

Most female herbivores ensure to lay eggs where their offspring can develop successfully. The oviposition preferences of females affect strategies in pest management. In this study, the performance of two cohorts of Trichoplusia ni larvae on cabbage and cotton （after they had been transferred from their original host plants） were investigated. The preferences of female moth ovipositing and larval feeding on these two host plants were observed. The results indicated that plants significantly affected oviposition preference of the female adults and development and survival of larvae of T. ni. All females preferred to lay eggs on cabbage than cotton regardless from which host they originated. The detrimental effects of cotton on the development and survival of T. ni larvae originated from cabbage （CaTn） increased with the increase of the larval age when they were transferred. In addition, the host plant change did not significantly affect the development and survival of larvae of T. ni originating from cotton （CoTn）. Larvae of CaTn preferred cabbage plants as compared to cotton plants, whereas larvae of CoTn did not show a significant choice. Although the adult females preferred laying eggs on cabbage, they did not show preferences between cotton and cabbage in a Y-tube olfactometer test. The hypothesis of oviposition preference and performance of larvae was supported by the results of CaTn, whereas they not supported by those from CoTn. Based on these results, the strategy to manage this serious pest was discussed.

关键词： cabbage looper development larval choice oviposition preference

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Interfacial properties of black phosphorus/transition metal carbide van der Waals heterostructures

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Frontiers of physics 2018年第3期13卷 91-99页

作者： hao yuan Zhenyu Li Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China

Owing to its outstanding electronic properties, black phosphorus （BP） is considered as a promis- ing material for next-generation optoelectronic devices. In this work, devices based on BP/MXene （Zrn＋1CnT2, T = O, F, OH, n = 1, 2） van der Waals （vdW） heterostructures are designed via first-principles calculations. Zrn＋1CnW2 compositions with appropriate work functions lead to the for- mation of Ohmic contact with BP in the vertical direction. Low Schottky barriers are found along the lateral direction in BP/Zr2CF2, BP/Zr2CO2H2, BP/Zr3C2F2, and BP/Zr3C2O2H2 bilayers, and BP/Zr3C202 even exhibits Ohmic contact behavior. BP/Zr2CO2 is a semiconducting heterostructure with type-II band alignment, which facilitates the separation of electron-hole pairs. The band struc- ture of BP/Zr2CO2 can be effectively tuned via a perpendicular electric field, and BP is predicted to undergo a transition from donor to acceptor at a 0.4 V/A electric field. The versatile electronic prop- erties of the BP/MXene heterostructures examined in this work highlight their promising potential for applications in electronics.

关键词： BP/MXene Schottky barrier type-Ⅱ band alignment

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Heat Treatment of Spray Deposition SiCp/6066 Aluminum Matrix Composites

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Journal of Central South University 2000年第2期12卷 61-64页

作者： Gong hao-ran Li Wen-xian Department of Materials Science and Engineering Central South University of TechnologyChangsha 410083China

Heat treatment of spray deposition 10% SiCp/6066 ( φ (SiCp)=10%) composites was investigated by means of hardness measurement. The results show that heat treatment technology is influenced by the presence of SiC particles. Compared with the base alloy 6066, the composites have lower burning temperature and is burnt at 540 ℃ due to the enrichment of Mg and Cu atoms in the SiCp/6066 interfaces. As a result, solution treatment of the composites should be carried out at lower temperature. The aging parameter values such as the aging temperature, the precipitation temperature of β′ and β phases, as well as the peak aging time, become lower. The optimum heat treatment process conditions are that the composites are solution treated at 515 ℃ and aged at 165 ℃ for 5 h.

关键词： spray deposition composites solution treatment temperature aging

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Magnéli phases TinO2n-1 as novel ozonation catalysts for effective mineralization of phenol

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1978-1984页

作者： xian Mao Fanglu yuan Anqi Zhou Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for special Separation Membrane College of Chemical EngineeringNanjing Tech UniversityNanjing210009China

Magnéli phases TinO2n-1 have been demonstrated as promising environmentally friendly materials in advanced oxidation *** this study,Magnéli phases TinO2n-1 have been used as catalysts for the ozonation of phenol in aqueous solution for the first *** materials exhibited excellent catalytic ozonation activities both in phenol degradation and *** Ti4O7was added,the reaction rate was six-fold higher than that of with ozone alone,while the total organic carbon removal rate was substantially elevated from around 19.2%to 92%.By virtue of the good chemical stability of the materials,a low metal leaching of less than 0.15 mg·L^-1could effectively avoid the secondary pollution by metal *** quenching tests revealed·O2^-and ^1O2to be active oxygen species for phenol degradation at p H *** semiconductor catalysts,TinO2n-1 materials show electronic transfer *** adsorbed at B-acid sites of the catalyst surface can capture an electron from the conversion of Ti（Ⅲ）to Ti（Ⅳ）,and is thereby broken into the active oxygen *** was interesting to observe that TinO2n-1 exhibit better catalytic activity for phenol degradation and mineralization with lower n *** difference in electrical conductivity can be considered as a major factor for the catalytic *** highly conductive catalysts show a faster electron-transfer rate and better catalytic ***,significant evidences have been obtained for a single-electron-transfer mechanism of catalytic ozonation with Magnéli phases TinO2n-1.

关键词： TinO2n-1 Catalytic ozonation Conductivity B-acid sites Single-etectron-transfer

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Surface Temperature Change of U75V 60 kg/m Heavy Rail During Heat Treatment

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Journal of Iron and Steel Research International 2013年第2期20卷 33-37,67页

作者： KANG hao WU Di Zhao xian-ming State Key Laboratory of Rolling and Automation Northeastern University

The U75V 60 kg/m heavy rail samples were heated to 900 ℃ in a resistance furnace for a fixed duration of 50 min. Under this condition, the samples were austenitized totally. Then, the samples were dragged out of furnace and cooled for 25 s in the open air. After that, the samples entered into the air spraying channel, and were cooled from the top and both sides by compressed air. During this period, main technical parameters were changed such as the distance between spray nozzles and surface of rail head, air pressure, air spraying time and air temperature. So under laboratory condition, optimal heat-treating parameters of U75V 60 kg/m heavy rail were determined as the distance between spray nozzles and surface of rail head of 15 mm, air pressure of 0.26 MPa, cooling time of 80 s, and air temperature of 28 ℃. The surface temperature at different positions of heavy rail was measured before and after heat treatment, and the temperature changing law was determined. The self tempering occurred on the surface of rail head after heat treatment, and the tempering temperature became the largest （about 3 min） after heat treatment, separately 528, 524 and 536 ℃ at the center, top fillet and bottom fillet of rail head. The heavy rail was cooled in open air after heat treatment; during this period, the temperature gap on the surface of heavy rail became smaller and smaller, and was reduced to zero when being cooled for 20 min.

关键词： temperature change heavy rail heat treatment

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Targeted migration of mesenchymal stem cells modified with CXCR4 to acute failing liver improves liver regeneration

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World Journal of Gastroenterology 2014年第40期20卷 14884-14894页

作者： Hu-Cheng Ma Xiao-Lei Shi hao-Zhen Ren xian-Wen yuan Yi-Tao Ding Department of Hepatobiliary Surgery the Affiliated Drum Tower Hospital of Nanjing University Medical School Key Medical Center for Hepatobiliary Diseases of Jiangsu Province

AIM: To improve the colonization rate of transplanted mesenchymal stem cells (MSCs) in the liver and effect of MSC transplantation for acute liver failure (ALF).

关键词： Acute liver failure Cell transplantation Chemokine CXC receptor 4 Mesenchymal stem cells Cell mobilization

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A Mn-porphyrinic metal–organic framework immobilizing glucose oxidase for combined photodynamic/chemodynamic/starvation therapy

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Tungsten 2025年第1期 183-194页

作者： Xin-Ran Sun hao-Ming yuan Guo-Da Zhang Chao Wang Shu-Juan Sun Peng-Fei Shi Shandong Provincial Key Laboratory of Detection Technology for Tumor Markers School of Chemistry and Chemical Engineering Linyi University

The combination of photodynamic therapy（PDT） and chemodynamic therapy（CDT） in tumor treatment has attracted considerable ***,tumor hypoxia and glutathione（GSH） overproduction in the tumor tissue restricted the progress of their ***,a Mn-porphyrinic metal-organic framework（Mn-TCPP） was constructed by the one-pot method and further used for immobilizing glucose oxidase（GOx） to obtain GOx@*** would rapidly exhaust endogenous glucose into hydrogen peroxide（H2O2） and gluconic acid,thus shutting off the energy supply of tumor cells for starvation ***-TCPP catalyzed H2O2to produce oxygen,regulating the hypoxic tumor microenvironment and in turn improving1O2generation under laser ***,Mn-TCPP can reduce reactive oxygen species consumption owing to the redox reaction between Mn3+and GSH,thus greatly enhancing ***,benefiting from GOx-mediated starvation therapy,Mn2+produced by Mn3+reduction can react with sufficient intracellular H2O2to generate ·OH with high cytotoxicity through a Fenton-like *** treatment by GOx@Mn-TCPP under laser irradiation in vitro,the cell viability of 4T1 and A549 tumor cells reached to 20%,reflecting GOx@Mn-TCPP could give full play to the advantages of PDT/CDT/starvation *** results in vivo demonstrated that GOx@Mn-TCPP mediated synergistic cascade therapy could significantly inhibit tumor growth and improve the therapeutic effect.

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MgN_(4)掺杂石墨烯CO氧化催化活性的密度泛函研究

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原子与分子物理学报 2025年第2期42卷 57-62页

作者：袁利郑灵丹周慧颖徐先燕广州医科大学公共卫生学院广州511436 韶关学院化学与土木工程学院韶关512005

鉴于镁卟啉所呈现的催化活性,采用密度泛函理论考察了MgN_(4)结构掺杂石墨烯的CO氧化催化活性.研究发现MgN_(4)掺杂石墨烯具有良好的结构稳定性,O_(2)优先吸附在金属活性位点且不易解离.其CO氧化以Eley-Rideal(ER)机理实现,决速步能垒仅... 详细信息

鉴于镁卟啉所呈现的催化活性,采用密度泛函理论考察了MgN_(4)结构掺杂石墨烯的CO氧化催化活性.研究发现MgN_(4)掺杂石墨烯具有良好的结构稳定性,O_(2)优先吸附在金属活性位点且不易解离.其CO氧化以Eley-Rideal(ER)机理实现,决速步能垒仅为0.67 eV,与FeC_(3)、AlN_(4)掺杂石墨烯具有相当的催化活性.MgN_(4)掺杂石墨烯有望是一种具有潜在CO氧化催化活性的催化剂.

关键词： MgN_(4)掺杂石墨烯 CO氧化密度泛函理论

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