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Ultrathin nanobelts-assembled Chinese knot-like 3D TiO2 for fast and stable lithium storage

Nano Research 2018年第4期11卷 2116-2128页

作者： Qili wu Shiman He Xianfeng Yang Jingling Yang Gaoren Li Yuying Meng Shengfu Tong Liqiang Mai Mingmei wu MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of Chemistry Sun Yat-Sen University Guangzhou 510275 China Analytical and Testing Center South China University of Technology Guangzhou 510640 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Nanostructured TiO2 has applications in solar cells, photocatalysts, and fast- charging, safe lithium ion batteries （LIBs）. To meet the demand of high-capacity and high-rate LIBs with TiO2-based anodes, it is important to fine-tune the nanoarchitecture using a well-controlled synthesis approach. Herein, we report a new approach that involves epitaxial growth combined with topotactic conversion to synthesize a unique type of three-dimensional （3D） TiO2 nano- architecture that is assembled by well-oriented ultrathin nanobelts. The whole nanoarchitecture displays a 3D Chinese knot-like morphology; the core consists of robust perpendicular interwoven nanobelts and the shell is made of extended nanobelts. The nanobelts oriented in three perpendicular [001]A directions facilitate Li＋ penetration and diffusion. Abundant anatase/TiO2-B interfaces provide a large amount of interfacial pseudocapacitance. A high and stable capacity of 130 mA.h.g-1 was obtained after 3,000 cycles at 10 A·g-1 （50 C）, and the high-rate property of our material was greater than that of many recently reported high-rate TiO2 anodes. Our result provides, not only a novel synthesis strategy, but also a new type of 3D anatase TiO2 anode that may be useful in developing long-lasting and fast-charging batteries.

关键词： three-dimensional (3D) nanoarchitectures ultrathin nanobelts TiO2 lithium ion storage ultrahigh rate battery

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New Method for Universal Models Composed of Arbitrary Boson Modes with Arbitrary Two-Body Interactions

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Chinese Physics Letters 2001年第4期18卷 476-478页

作者： YANG Xiao-Xue wu Ying Department of Physics Huazhong University of Science and TechnologyWuhan 430074

We propose a new method for the energy eigenvalue problem for boson systems with either weak or strong two-body *** is also shown that this method is particularly simple and effective to obtain the explicit analytical expressions of energy eigenvalues and eigen-states for interacting harmonic oscillators especially when the number of the oscillators is huge.

关键词： eigenvalue harmonic method

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A molecular sieve-containing protective separator to suppress the shuttle effect of redox mediators in lithium-oxygen batteries

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Nano Research 2023年第7期16卷 9453-9460页

作者： Xinbin wu Huiping wu Shundong Guan Ying Liang Kaihua Wen Huanchun Wang Xuanjun Wang Ce-Wen Nan Liangliang Li State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China High-Tech Institute of Xi’an Xi’an 710025China

Lithium-oxygen(Li-O_(2))batteries have a great potential in energy storage and conversion due to their ultra-high theoretical specific energy,but their applications are hindered by sluggish redox reaction kinetics in the charge/discharge *** mediators(RMs),as soluble catalysts,are widely used to facilitate the electrochemical processes in the Li-O_(2)batteries.A drawback of RMs is the shuttle effect due to their solubility and mobility,which leads to the corrosion of a Li metal anode and the degradation of the electrochemical performance of the ***,we synthesize a polymer-based composite protective separator containing molecular *** nanopores with a diameter of 4Åin the zeolite powder(4A zeolite)are able to physically block the migration of 2,2,6,6-tetramethylpiperidinyloxy(TEMPO)molecules with a larger size;therefore,the shuttle effect of TEMPO is *** the assistance of the zeolite molecular sieves,the cycle life of the Li-O_(2)batteries is significantly extended from~20 to 170 cycles at a current density of 250 mA·g^(-1)and a limited capacity of 500 mAh·g^(-1).Our work provides a highly effective approach to suppress the shuttle effects of RMs and boost the electrochemical performance of Li-O_(2)batteries.

关键词： lithium-oxygen batteries redox mediators shuttle effects protective separators zeolite molecular sieves

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First Record of the Genus Wijayarana (Anura, Ranidae) from Yunnan, China

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Asian Herpetological Research 2023年第1期14卷 116-120,I0006页

作者： Dongyi wu Junkai HUANG Yunhe wu Xiaolong LIU Jing CHE Zhiyong YUAN Key Laboratory of Freshwater Fish Reproduction and Development Ministry of EducationSouthwest UniversityChongqing 400715China Key Laboratory for Conserving Wildlife with Small Populations in Yunnan Southwest Forestry UniversityKunming 650224YunnanChina Key Laboratory of Rare and Endangered Animal Ecology Guangxi ProvinceCollege of Life ScienceGuangxi Normal UniversityGuilin 541001GuangxiChina State Key Laboratory of Genetic Resources and Evolution Yunnan Key Laboratory of Biodiversity and Ecological Conservation of Gaoligong MountainKunming Institute of ZoologyChinese Academy of SciencesKunming 650223YunnanChina Southeast Asia Biodiversity Research Institute Chinese Academy of SciencesYezinNay Pyi Taw 05282Myanmar

Dear Editor,e family Ranidae is one of the largest and most families of amphibians(Che et al.,2007),with 64 recognized genera and429 species(Frost,2022).However,the systematics and natural history of some ranid groups have not been *** such example is the taxonomic relationship between Sylvirana,H ylarana and other closely-related taxa(Che et al.,2007;Pyron and Wiens,2011;Oliver et al.,2015).China has a large diversity of ranid frogs,with 146 speciesbelonging to 7 genera,and48 species belonging to 7 genera in the southern province of Yunnan(AmphibiaChina,2022).

关键词： Genus Frost genera

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Analysis on Origin of Oscillation of H Moment in High-Energy hh Collision

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Chinese Physics Letters 2000年第11期17卷 792-794页

作者： wu Tao ZHOU Dai-Cui Institute of Particle Physics Huazhong Normal UniversityWuhan 430079

Multiplicity distributions of negative binomial distribution(NBD)and modified NBD are obtained from a birth process model with an *** ratio of factorial cumulant moment to factorial moment,i.e.,H moment is calculated from different multiplicity distributions of NBD,modified NBD and the three fireball model,which shows an oscillatory behavior when there is a truncation of *** oscillation of H moment is related to the common character of the truncated multiplicity distributions.

关键词： multiplicity moment factorial

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AUREA maintains the balance between chlorophyll synthesis and adventitious root formation in tomato

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Horticulture Research 2020年第1期7卷 770-780页

作者： Junqing wu Jie Cheng Chunmiao Xu Shilian Qi Wenru Sun Shuang wu College of Horticulture FAFU-UCR Joint Center for Horticultural Biology and MetabolomicsHaixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhou 35002 FujianChina

Flooding tolerance is an important trait for tomato *** this study,we obtained a recessive mutant exhibiting highly enhanced submergence *** analyses showed that this resistant to flooding(rf)mutant displays slightly chlorotic leaves and spontaneous initiation of adventitious roots(ARs)on *** mutation was mapped to the phytochromobilin synthase gene AUREA(AU),in which a single amino acid substitution from asparagine to tyrosine *** addition to the classic function of AU in phytochrome and chlorophyll biogenesis in leaves,we uncovered its novel role in mediating AR formation on *** further observed temporal coincidence of the two phenotypes in the rf mutant:chlorosis and spontaneous AR formation and revealed that AU functions by maintaining heme ***,our grafting results suggest that heme might play roles in AR initiation via long-distance transport from leaves to *** results present genetic evidence for the involvement of the AU–heme oxygenase-1–heme pathway in AR initiation in *** fruit production and yield in the rf mutant are minimally impacted,the mutation identified in this study may provide a target for biotechnological renovation of tomato germplasm in future breeding.

关键词： maintain synthesis coincidence

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Boosting cationic and anionic redox activity of Li-rich layered oxide cathodes via Li/Ni disordered regulation

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Journal of Energy Chemistry 2025年第1期 533-543页

作者： Zewen Liu Zhen wu Hao Wang Xudong Zhang Yuanzhen Chen Yongning Liu Shengwu Guo Shenghua Chen Yanli Nan Yan Liu State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University School of Materials Science and Engineering Xi'an University of Architecture and Technology Hefei Advanced Computing Center Operation Management Corp Ltd Network Information Center Xi'an Jiaotong University

Lithium-rich layered oxides （LLOs） are increasingly recognized as promising cathode materials for nextgeneration high-energy-density lithium-ion batteries （LIBs）.However,they suffer from voltage decay and low initial Coulombic efficiency （ICE） due to severe structural degradation caused by irreversible O ***,we introduce a three-in-one strategy of increasing Ni and Mn content,along with Li/Ni disordering and TM–O covalency regulation to boost cationic and anionic redox activity simultaneously and thus enhance the electrochemical activity of *** target material,Li1.2Ni0.168Mn0.558Co0.074O2（L1）,exhibits an improved ICE of 87.2%and specific capacity of 293.2 mA h g-1and minimal voltage decay of less than 0.53 m V cycle-1over 300 cycles at 1C,compared to Li1.2Ni0.13Mn0.54Co0.13O2（Ls）(274.4 mA h g-1for initial capacity,73.8%for ICE and voltage decay of 0.84 mV/cycle over 300 cycles at 1C).Theoretical calculations reveal that the density of states （DOS） area near the Fermi energy level for L1 is larger than that of Ls,indicating higher anionic and cationic redox reactivity than ***,L1 exhibits increased O-vacancy formation energy due to higher Li/Ni disordering of 4.76%（quantified by X-ray diffraction Rietveld refinement） and enhanced TM–O covalency,making lattice O release more difficult and thus improving electrochemical *** increased Li/Ni disordering also leads to more Ni2+presence in the Li layer,which acts as a pillar during Li+de-embedding,improving structural *** research not only presents a viable approach to designing low-Co LLOs with enhanced capacity and ICE but also contributes significantly to the fundamental understanding of structural regulation in high-performance LIB cathodes.

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Sulfuric acid leaching of low-grade refractory tantalum–niobium and associated rare earths minerals in Panxi area of China

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Rare Metals 2015年第3期34卷 202-206页

作者： Biao wu He Shang Jian-Kang Wen National Engineering Laboratory of Biohydrometallurgy General Research Institute for Nonferrous Metals

By mineral liberation analyzer （MLA） automated quantitative system, the niobium-tantalum ore in this study was classified as refractory mineral of low-grade which was mainly composed of fergusonite, polycrase, ilmenorutile, and bastnasite. Most of niobium and rare earth metals were dis- seminated in these minerals （particle sizes of 95 % rare earth elements 〈40 μm）, which cannot be concentrated through traditional floatation process and treated by the current hydrofluoric acid leaching in industry application. It is nec- essary to develop a new approach to recovery these valuable metals. In this study, an improved method is proposed to extract these metals, which includes acid roasting and sulfuric acid leaching. The influence of mineralogy, acid concentra- tion, leaching temperature, leaching time, and liquid to solid ratio was experimentally studied. It is observed that after the ground ore （-74 μm） was roasted at 350 ℃ for 2 h with sulfuric acid （18.4 mol.L- 1） in the ore to acid mass ratio of 1：1, and then the roasting residue reacted with 25 % sulfuric acid at 90 ℃ for 2 h, the recovery rate of rare earth elements reaches 〉90 %, and the leaching extent of niobium can reach 84 %.

关键词： Niobium-tantalum Rare earth Refractory Low-grade Roasting Sulfuric acid leaching

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Acting mechanism of F,K,and Na in the solid phase sintering reaction of the Baiyunebo iron ore

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 137-142页

作者： Zhi-zhong Hao Sheng-li wu Yi-ci Wang Guo-ping Luo Hu-lin wu Xiang-guang Duan School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Iron Plant Baotou Iron and Steel Company Baotou 014010 China School of Material and Metallurgy Inner Mongolia University of Science and Technology Baotou 014010 China Technical Center Baotou Iron and Steel Company Baotou 014010 China

The effect of F,K,and Na on the solid phase reaction of the Baiyunebo iron ore was investigated by differential thermal analysis （DTA） and X-ray diffraction（XRD）.It has been identified that alkaline elements K and Na in the Baiyunebo ore instigate the formation of low melting point compounds Na2SiO3 and Na2O·Fe2O3 and the generation of molten state in the solid phase *** F in the Baiyunebo ore facilitates the formation of cuspidine compound 3CaO·2SiO2·CaF2 in the solid phase *** cuspidine compound is kept in solid as one of the final products through the entire sintering process due to its high melting *** the sintering process,CaF2and SiO2 react with CaO first and form 3CaO·2SiO2·CaF2 and 3CaO·2SiO2,so the formation of ferrites,Na2O·Fe2O3,and 2CaO·Fe2O3 is inhibited.

关键词： iron ore solid phase sintering alkaline elements reaction temperature reaction product mechanism

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渗透压–应力耦合作用下砂岩渗透率与变形关联性三轴试验研究

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岩石力学与工程学报 2013年第6期32卷 1203-1213页

作者：俞缙李宏陈旭蔡燕燕武娜穆康华侨大学岩土工程研究所福建厦门361021 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 大连理工大学土木与水利学院辽宁大连116024

为了探讨渗透压–应力耦合作用下岩石渗透率与变形的关联性,采用岩石伺服三轴试验系统,在不同围压和渗透压条件下,利用稳态法对砂岩全应力–应变过程进行渗透率试验研究。根据试样渗透率变化与其破坏过程的对应关系,分析全应力–应变过... 详细信息

为了探讨渗透压–应力耦合作用下岩石渗透率与变形的关联性,采用岩石伺服三轴试验系统,在不同围压和渗透压条件下,利用稳态法对砂岩全应力–应变过程进行渗透率试验研究。根据试样渗透率变化与其破坏过程的对应关系,分析全应力–应变过程中试样渗透率随其脆性、延性变化的特点及渗透率–轴向应变和渗透率–体积应变之间的关联性。试验结果表明:(1)在渗透压–应力耦合作用下,试样初始渗透率、峰值强度随着围压与渗透压的改变而改变。(2)在渗流场–应力场耦合作用下连续加载的全应力–应变过程中,渗透率先随着轴向应变的增大而逐渐减小,进入弹塑性阶段后,渗透率变化曲线随围压变化呈现增大、持平及减小3个不同趋势。其中,渗透率曲线持平的现象为三轴渗透试验研究中的新现象。(3)围压较高时,若形成局部压缩带,则试样进入弹塑性阶段后,渗透率的变化趋势是由岩石微裂隙的萌生、扩展与岩石骨架颗粒压碎这2个主要因素共同决定的。(4)岩石微裂隙的萌生、扩展对渗透率增大起积极作用,岩石骨架颗粒压碎形成的压缩带对渗透率增大起抑制作用。(5)岩石进入塑性阶段后,随围压增大,渗透率由上升趋势转变为下降趋势的现象先于脆–延转换的临界状态发生。(6)岩石的体积应变对渗透率有一定影响,在脆–延转换阶段存在体积应变增大而渗透率减小的现象,这需要其他能够更精确地测量体积应变变化的试验进一步验证。

关键词：岩石力学渗透压–应力耦合渗透率三轴压缩压缩带全应力–应变过程脆–延转换

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