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mixed phase sodium manganese oxide as cathode for enhanced aqueous zinc-ion storage

Chinese Journal of Chemical Engineering 2020年第8期28卷 2214-2220页

作者： Xinyu Wang Xinghua Qin Qiongqiong Lu Mingming Han Ahmad Omar Daria Mikhailova Institute of Materials and Technology Dalian Maritime UniversityDalian 116026China Leibniz Institute for Solid State and Materials Research(IFW)Dresden e.V. Helmholtzstraße 2001069 DresdenGermany School of Materials Science and Engineering Central South UniversityChangsha 410083China

Aqueous zinc-ion batteries have been regarded as a promising alternative to large-scale energy storage, due to associated low-cost, improved safety and environmental friendliness. However, a high-performance cathode material for both rate capability and specific capacity is still a challenge. One kind of the more promising candidates are sodium manganese oxide(NMO) materials, although they suffer from individual issues and need to be further improved. Herein, we present a novel mixed phase NMO material composed of nearly equal amounts of Na(0.55)Mn2O4 and Na(0.7)MnO(2.05). The structured configuration with particle size of 200–500 nm is found to be beneficial towards improving the ion diffusion rate during the charge/discharge process. Compared with Na(0.7)MnO(2.05) and Na(0.55)Mn2O4, the mixed phase NMO demonstrates an enhanced rate capability and excellent long-term cycling stability with a capacity retention of 83% after 800 cycles. More importantly, the system also delivers an impressive energy density and power density, as 378 W·h·kg^-1 at 68.7 W·kg^-1, or 172 W·h·kg^-1 at 1705 W·kg^-1. The superior electrochemical performance is ascribed to the fast Zn^2+ diffusion rate because of a large ratio of capacitive contribution(63.9% at 0.9 m V·s^-1). Thus, the mixed phase route provides a novel strategy to enhance electrochemical performance, enabling mixed phase NMO as very promising material towards large-scale energy-storage applications.

关键词： Aqueous zinc-ion battery Sodium manganese oxide mixed phase High energy density

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Enhanced photodynamic therapy of mixed phase TiO2（B）/anatase nanofibers for killing of HeLa cells

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Nano Research 2014年第11期7卷 1659-1669页

作者： Shuchao Zhang Dongjiang Yang Dengwei Jing Hongwei Liu Long Liu Yi Jia Meihua Gao Liejin Guo Ziyang Huo Department of Blood Transfusion the Affifiated Hospital of Medical College Qingdao University Oingdao 266003 China Department of Immunology Medical College of Qingdao University Qingdao266000 China Collaborative Innovation Centre for Marine Biomass Fibers Materials and Textiles of Shandong Province College of Chemical and Environmental Engineering Qingdao University Qingdao China Queensland Micro- and Nanotechnology Centre (QMNC) Griffith University Nathan Brisbane QLD 4111 Australia International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering College of Chemistry Chemical and Environmental Engineering Xi'an Jiaotong University Xi'an 710049 China Australian Centre for Microscopy and Microanalysis (ACMM) the University of Sydney Sydney NSW 2006 Australia

Photodynamic therapy （PDT）, which is a procedure that uses photosensitizing drug to apply therapy selectively to target sites, has been proven to be a safe treatment for cancers and conditions that may develop into cancers. Nano-sized TiO2 has been regarded as potential photosensitizer for UV light driven PDT. In this study, four types of TiO2 nanofibers were prepared from proton tri-titanate （H2T3O7） nanofiber. The as-obtained nanofibers were demonstrated as efficient photosensitizers for PDT killing of HeLa cells. MTT assay and flow cytometry （FCM） were carried out to evaluate the biocompatibility, percentage of apoptotic cells, and cell viability. The non-cytotoxicity of the as-prepared TiO2 nanofibers in the absence of UV irradiation has also been demonstrated. Under UV light irradiation, the TiO2 nanofibers, particularly the mixed phase nanofibers, displayed much higher cell-killing efficiency than Pirarubicin （THP）, which is a common drug to induce the apoptosis of HeLa cells. We ascribe the high cell- killing efficiency of the mixed phase nanofibers to the bandgap edge match and stable interface between TiO2（B） and anatase phases in a single nanofiber, which can inhibit the recombination of the photogenerated electrons and holes. This promotes the charge separation and transfer processes and can produce more reactive oxygen species （ROS） that are responsible for the killing of HeLa cells.

关键词： photodynamic therapy titanium oxides (TiO2) nanomaterials apoptosis mixed phase

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Influence of carbon and yttrium co-doping on the photocatalytic activity of mixed phase TiO_2

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Chinese Journal of Catalysis 2017年第10期38卷 1688-1696页

作者： Honglin Gao Jianmei Liu Jin Zhang Zhongqi Zhu Genlin Zhang Qingju Liu nano Materials & Technology Yunnan University Kunming 650091 Yunnan China School of Materials Science and Engineering Yunnan Key Laboratory for Micro Kunming 650091 Yunnan China

mixed phase TiO2photocatalysts doped with C and Y were synthesized by a sol‐gel *** effects of C and Y doping and annealing temperatures on the structural and optical properties,and photocatalytic activity were *** found that both C and Y doping can broaden the absorption spectrum of TiO2to the visible light region and inhibit recombination of photogenerated electron/hole *** incorporation of Y into the TiO2lattice inhibited growth of crystalline grains,which increased the specific surface area and enhanced the photocatalytic *** photocatalytic performance of the samples was investigated in the photocatalytic degradation of methyl blue under visible light *** rate of methyl blue degradation over the(C,Y)‐co‐doped TiO2sample was much higher than those of undoped TiO2,C‐TiO2,and Y‐***,the apparent first‐order rate constant of the co‐doped sample was3.5times as large as that of undoped mix phase TiO2under the same experimental *** enhanced photocatalytic activity can be attributed to the synergic effect of(C,Y)‐co‐doping and the formation of an appropriate crystalline structure.

关键词： Titanium dioxide Co‐doping mixed phase phase control Visible light photocatalysis

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Exciton optical absorption in asymmetric ZnO/ZnMgO double quantum wells with mixed phases

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Chinese Physics B 2020年第7期29卷 456-463页

作者： Zhi-Qiang Han Li-Ying Song Yu-Hai Zan Shi-Liang Ban School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China

The optical absorption of exciton interstate transition in Zn1-xlMgxlO/ZnO/Zn1-xcMgxcO/ZnO/Zn1-xrMgxrO asymmetric double quantum wells(ADQWs)with mixed phases of zinc-blende and wurtzite in Zn1-xMgxO for 0.37mixed phases are taken into account by our weight model of *** states of excitons are obtained by a finite difference method and a variational procedure in consideration of built-in electric fields(BEFs)and the Hartree *** optical absorption coefficients(OACs)of exciton interstate transition are obtained by the density matrix *** results show that Hartree potential bends the conduction and valence bands,whereas a BEF tilts the bands and the combined effect enforces electrons and holes to approach the opposite interfaces to decrease the Coulomb interaction effects between electrons and ***,the OACs indicate a transformation between direct and indirect excitons in zinc-blende ADQWs due to the quantum confinement *** are two kinds of peaks corresponding to wurtzite and zinc-blende structures respectively,and the OACs merge together under some special *** computed result of exciton interband emission energy agrees well with a previous *** conclusions are helpful for further relative theoretical studies,experiments,and design of devices consisting of these quantum well structures.

关键词： quantum well mixed phase exciton transition direct and indirect exciton optical absorption

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Synthesis and electrochemical properties of Mn-substituted high-capacity nickel hydroxide

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Rare Metals 2022年第6期41卷 1977-1982页

作者： Hao Lei Yang Pan Rong-Gui Guo Jing Zhang Xue Han Li-Min Yu Wen-Quan Jiang Research Institute of Rare Earth Metallurgical Materials and Applied Technology General Research Institute for Nonferrous MetalsBeijing 100088China

Nickel hydroxide is widely used as cathode materials in nickel-metal secondary *** this work,Mn-substituted nickel hydroxide samples with a special α/βmixed phase structure were synthesized by chemical co-precipitation *** physical properties were char-acterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),differential scanning calorimetry(DSC)and field emission scanning electron microscopy(FE-SEM).The results show that the structure of the samples and the amount of intercalated anions and water molecules are highly related to the content of the Mn *** electrochemical performances were characterized by charge/discharge tests and electrochemi-cal cycle *** results demonstrate that the Mn-sub-stituted samples with a α/β mixed phase structure perform a much higher discharge capacity than normal β-nickel *** specific discharge capacity reaches 330 mAh·g^(-1) after 50 cycles of charge/discharge in charging rate of 0.2C under ambient ***-while,the samples show no capacity loss in electrochem-ical cycles,which indicates that the mixed phase nickel hydroxide maintains high structure stability.

关键词： Nickel hydroxide Cathode material Nickel-metal battery mixed phase Electrochemical performance

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High-throughput structure determination of polycrystalline functional materials:a platform for automated 3DED/MicroED data collection

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Science China Chemistry 2024年第12期67卷 4158-4166页

作者： Zhenghan Zhang Zhengyin Liang Chao Ma Cong Lin Jian Li State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 99077China

Structure determination plays the most crucial role in the discovery of novel functional materials,because only by knowing the intrinsic structures can we accurately and completely understand their properties and ***,most new materials are obtained in polycrystalline form or even as mixtures with multiple phases when first synthesized,presenting significant challenges in their structure determination and phase ***,the developed three-dimensional electron diffraction(3DED/MicroED)has provided a promising solution to overcome these *** this study,we have constructed a state-of-the-art 3DED/MicroED data acquisition equipment by integrating a hybrid-pixel detector with a script developed for Serial EM,and thus successfully developed an automated 3DED/MicroED method for the high-throughput structure *** demonstrate its effectiveness,a multiphase sample with complex porous structures is employed,showcasing that individual phases and their structures can be identified and determined,*** remarkable finding is the identification of an impurity metal-organic framework(MOF)that is completely invisible to traditional powder X-ray diffraction in a supposedly“pure”commercial MOF ***,our method also enables the atomic-resolution structure determination of flexible covalent organic framework materials,which are highly sensitive to electron ***,a new microporous aluminoborate is discovered using this rapid structure determination *** experimental results highlight the enormous potential of our 3DED/MicroED method in the field of new materials discovery,offering a powerful tool for the structure determination of polycrystalline functional materials.

关键词： 3DED/MicroED high-throughput structure determination mixed phase porous materials

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Ternary-phase layered cathodes toward ultra-stable and highrate sodium ion storage

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Rare Metals 2024年第4期43卷 1589-1598页

作者： Wen-Ji Yin Pei-Dan Su Qi Lu Xiao-Qiong Li Ji-Ming Peng Teng-Fei Zhou Ge-Meng Liang Yu-Liang Cao Hong-Qiang Wang Qing-Yu Li Si-Jiang Hu Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin541004China Institutes of Physical Science and Information Technology Anhui UniversityHefei230601China Department of Chemistry and Pharmaceutical Sciences Guilin Normal CollegeGuilin541199China College of Chemistry and Chemical Engineering Huanggang Normal UniversityHuanggang438000China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaide5005Australia Engineering Research Center of Organosilicon Compounds and Materials of Ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China

With the shortage of lithium resources,sodiumion batteries(SIBs)are considered one of the most promising candidates for lithium-ion batteries.P2-type and O3-type layered oxides are one of the few cathodes that can access high energy ***,they usually exhibit structural change,capacity decay,and slow Na ion ***,we present layered ternary-phase cathodes with P2,P3 and O3 phases by a lattice doping strategy,which is demonstrated by X-ray diffraction(XRD)*** the characteristics of P2,P3 and O3 phases,the layered composites show performance improvement during long-term battery *** particular,Na_(0.7)Li_(0.1)Co_(0.3-)Fe_(0.3)Mn_(0.3)O_(2)(NLCFM)delivers a reversible capacity of120.1 mAh·g^(-1)at 0.1C(1.0C=175 mA·g^(-1))with a superior capacity retention of 72.5%after 1000 cycles *** work offers insights into the development of advanced cathode materials for SIBs.

关键词： Sodium-ion battery Cathode material Layered oxides Lattice doping mixed phase

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On a Ginzburg-Landau Type Energy with Discontinuous Constraint for High Values of Applied Field

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Chinese Annals of Mathematics,Series B 2011年第1期32卷 15-26页

作者： Hassen AYDI Université de Monastir Institut Supérieur d'Informatique de MahdiaKm 4Réjiche5121 MahdiaTunisie

In the presence of applied magnetic fields H such that |lnε|《H《1/ε2,the author evaluates the minimal Ginzburg-Landau energy with discontinuous *** expression is analogous to the work of Sandier and Serfaty.

关键词： Ginzburg-Landau functional mixed phase Discontinuous constraint

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