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Purely Organic Phosphorescence: Resonance‐Activated Spin‐Flipping for Efficient Organic Ultralong Room‐Temperature Phosphorescence (Adv. Mater. 44/2018)

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advanced Materials 2018年第44期30卷

作者： Ye Tao Runfeng Chen Huanhuan Li Jie Yuan Yifang Wan He Jiang Cailin Chen Yubing Si Chao Zheng Baocheng Yang Guichuan Xing Wei Huang Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing University of Posts and Telecommunications 9 Wenyuan Road Nanjing 210023 China Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (Nanjing Tech) 30 South Puzhu Road Nanjing 211816 China Henan Provincial Key‐Laboratory of Nano‐Composite and Applications Institute of Nanostructured Functional Materials Huanghe Science and Technology College Zhengzhou Henan 450006 China

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Rücktitelbild: Redox Chemistry of Molybdenum Trioxide for Ultrafast Hydrogen‐Ion Storage (Angew. Chem. 36/2018)

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Angewandte Chemie 2018年第36期130卷

作者： Xianfu Wang Yiming Xie Kai Tang Chao Wang Chenglin Yan Soochow Institute for Energy and Materials Innovations College of Physics Optoelectronics and Energy Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China

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Redox Chemistry of Molybdenum Trioxide for Ultrafast Hydrogen‐Ion Storage

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Angewandte Chemie 2018年第36期130卷

Hydrogen ions are ideal charge carriers for rechargeable batteries due to their small ionic radius and wide availability. However, little attention has been paid to hydrogen‐ion storage devices because they generally deliver relatively low Coulombic efficiency as a result of the hydrogen evolution reaction that occurs in an aqueous electrolyte. Herein, we successfully demonstrate that hydrogen ions can be electrochemically stored in an inorganic molybdenum trioxide (MoO 3 ) electrode with high Coulombic efficiency and stability. The as‐obtained electrode exhibits ultrafast hydrogen‐ion storage properties with a specific capacity of 88 mA hg −1 at an ultrahigh rate of 100 C. The redox reaction mechanism of the MoO 3 electrode in the hydrogen‐ion cell was investigated in detail. The results reveal a conversion reaction of the MoO 3 electrode into H 0.88 MoO 3 during the first hydrogen‐ion insertion process and reversible intercalation/deintercalation of hydrogen ions between H 0.88 MoO 3 and H 0.12 MoO 3 during the following cycles. This study reveals new opportunities for the development of high‐power energy storage devices with lightweight elements.

关键词： Elektrochemie Interkalation Molybdäntrioxid Ultraschnelle Prozesse Wasserstoffionenspeicher

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Back Cover: Redox Chemistry of Molybdenum Trioxide for Ultrafast Hydrogen-Ion Storage (Angew. Chem. Int. Ed. 36/2018)

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Angewandte Chemie International Edition 2018年第36期57卷

作者： Dr. Xianfu Wang Yiming Xie Kai Tang Chao Wang Prof. Chenglin Yan Soochow Institute for Energy and Materials Innovations College of Physics Optoelectronics and Energy Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China

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Revealing electronic nature of broad bound exciton bands in two-dimensional semiconducting WS2 and MoS2

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Physical Review Materials 2017年第7期1卷 074001-074001页

作者： Jingzhi Shang Chunxiao Cong Xiaonan Shen Weihuang Yang Chenji Zou Namphung Peimyoo Bingchen Cao Mustafa Eginligil Wei Lin Wei Huang Ting Yu Institute of Flexible Electronics Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi’an 710072 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 State Key Laboratory of ASIC & System School of Information Science and Technology Fudan University Shanghai 200433 China Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) National Jiangsu Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China Fujian Provincial Key Laboratory of Semiconductor Materials and Applications Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Department of Physics Xiamen University Xiamen 361005 China Key Laboratory for Organic Electronics and Information Displays (KLOEID) and Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications Nanjing 210023 Jiangsu China

Owing to unique electronic, excitonic, and valleytronic properties, atomically thin transition metal dichalcogenides are becoming a promising two-dimensional (2D) semiconductor system for diverse electronic and optoelectronic applications. In an ideal 2D semiconductor, efficient carrier transport is very difficult because of lacking free charge carriers. Doping is necessary for electrically driven device applications based on such 2D semiconductors, which requires investigation of electronic structure changes induced by dopants. Therefore probing correlations between localized electronic states and doping is important. Here, we address the electronic nature of broad bound exciton bands and their origins in exfoliated monolayer (1L) WS2 and MoS2 through monitoring low-temperature photoluminescence and manipulating electrostatic doping. The dominant bound excitons in 1L WS2 vary from donor to acceptor bound excitons with the switching from n- to p-type doping. In 1L MoS2, two localized emission bands appear which are assigned to neutral and ionized donor bound excitons, respectively. The deep donor and acceptor states play critical roles in the observed bound exciton bands, indicating the presence of strongly localized excitons in such 2D semiconductors.

关键词： Electronic structure Excitons 2-dimensional systems Optical microscopy

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C4N3H monolayer: A novel two-dimensional organic Dirac material with high Fermi velocity

arXiv

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arXiv 2017年

作者： Pan, Hongzhe Zhang, Hongyu Sun, Yuanyuan Li, Jianfu Du, Youwei Tang, Nujiang National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing University Nanjing210093 China School of Physics and Electronic Engineering Linyi University Linyi276005 China Department of Physics East China University of Science and Technology Shanghai200237 China

Searching for two-dimensional (2D) organic Dirac materials, which have more adaptable practical applications in comparing with inorganic ones, is of great significance and has been ongoing. However, only two kinds of these materials with low Fermi velocity have been discovered so far. Herein, we report the design of an organic monolayer with C4N3H stoichiometry which possesses fascinating structure and good stability in its free-standing state. More importantly, we demonstrate that this monolayer is a semimetal with anisotropic Dirac cones and very high Fermi velocity. This Fermi velocity is roughly one order of magnitude larger than that in 2D organic Dirac materials ever reported, and is comparable to that in graphene. The Dirac states in this monolayer arise from the extended π-electron conjugation system formed by the overlapping 2pz orbitals of carbon and nitrogen atoms. Our finding opens a door for searching more 2D organic Dirac materials with high Fermi velocity. Copyright © 2017, The Authors. All rights reserved.

关键词： Monolayers

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Half-metallicity in honeycomb-kagome-lattice Mg3C2 monolayer with carrier doping

arXiv

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arXiv 2017年

作者： Pan, Hongzhe Han, Yin Li, Jianfu Zhang, Hongyu Du, Youwei Tang, Nujiang National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing University Nanjing210093 China School of Physics and Electronic Engineering Linyi University Linyi276005 China Department of Physics East China University of Science and Technology Shanghai200237 China

To obtain high-performance spintronic devices with high integration density, two-dimensional (2D) half-metallic materials are eagerly pursued all along. Here, we propose a stable 2D material with a honeycomb-kagome lattice, i.e., the Mg3C2 monolayer, based on the particle-swarm optimization algorithm and first-principles calculations. This monolayer is an anti-ferromagnetic (AFM) semiconductor at its ground state. And we demonstrate that a transition from AFM semiconductor to ferromagnetic half-metal in this 2D material can be induced by carrier (electron or hole) doping. The half-metallicity arises from the 2pz orbitals of the carbon (C) atoms for the electron-doped system, and from the C 2px and 2py orbitals for the case of hole doping. Our findings highlight a new promising material with controllable magnetic and electronic properties toward 2D spintronic applications. Copyright © 2017, The Authors. All rights reserved.

关键词： Monolayers

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Electrochemical Hydrogenation with Gaseous Ammonia

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Angewandte Chemie 2018年第6期131卷

作者： Jin Li Lingfeng He Xu Liu Xu Cheng Guigen Li Institute of Chemistry and Biomedical Sciences Jiangsu Key Laboratory of Advanced Organic Materials National Demonstration Center for Experimental Chemistry Education School of Chemistry and Chemical Engineering Nanjing University Xianlin Rd. 163 Nanjing 210023 China Jiangsu Provincial Engineering Laboratory of Advanced Materials for Salt Chemical Industry College of Chemical Engineering Huaiyin Institute of Technology Jiangsu Province Huaian 223003 China State Key Laboratory Cultivation Base for TCM Quality and Efficacy Nanjing University of Chinese Medicine Nanjing China Department of Chemistry and Biochemistry Texas Tech University Lubbock TX USA

As a carbon‐free and sustainable fuel, ammonia serves as high‐energy‐density hydrogen‐storage material. It is important to develop new reactions able to utilize ammonia as a hydrogen source directly. Herein, we report an electrochemical hydrogenation of alkenes, alkynes, and ketones using ammonia as the hydrogen source and carbon electrodes. A variety of heterocycles and functional groups, including for example sulfide, benzyl, benzyl carbamate, and allyl carbamate were well tolerated. Fast stepwise electron transfer and proton transfer processes were proposed to account for the transformation.

关键词： Ammoniak Elektrochemie Hydrierungen Nachhaltige Chemie Wasserstoffspeicherung

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Hydrogen Production: Light-Driven Sustainable Hydrogen Production Utilizing TiO2Nanostructures: A Review (Small Methods 1/2019)

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Small Methods 2019年第1期3卷

作者： Jingsheng Cai Jiali Shen Xinnan Zhang Yun Hau Ng Jianying Huang Wenxi Guo Changjian Lin Yuekun Lai College of Chemical Engineering Fuzhou University Fuzhou 350116 P. R. China Soochow Institute for Energy and Materials InnovationS (SIEMIS) Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 P. R. China National Engineering Laboratory for Modern Silk College of Textile and Clothing Engineering Soochow University Suzhou 215123 P. R. China Particles and Catalysis Research Group School of Chemical Engineering The University of New South Wales Sydney NSW 2052 Australia Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Lab for Soft Functional Materials Research Department of Physics College of Physical Science and Technology Xiamen University Xiamen 361005 P. R. China State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University Xiamen 361005 P. R. China

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Kinematics and Dynamics Hessian Matrices of Manipulators Based on Screw Theory

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 226-235页

作者： ZHAO Tieshi GENG Mingchao CHEN Yuhang LI Erwei YANG Jiantao Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University

The complexity of the kinematics and dynamics of a manipulator makes it necessary to simplify the modeling ***,the traditional representations cannot achieve this because of the absence of coordinate ***,the coordinate invariant method is an important research ***,the rigid-body acceleration,the time derivative of the twist,is proved to be a screw,and its physical meaning is *** on the twist and the rigid-body acceleration,the acceleration of the end-effector is expressed as a linear-bilinear form,and the kinematics Hessian matrix of the manipulator（represented by Lie bracket）is ***,Newton-Euler＇s equation is rewritten as a linear-bilinear form,from which the dynamics Hessian matrix of a rigid body is *** formulae and the dynamics Hessian matrix are proved to be coordinate *** to the principle of virtual work,the dynamics Hessian matrix of the parallel manipulator is gotten and the detailed dynamic model is *** index of dynamical coupling based on dynamics Hessian matrix is *** the end,a foldable parallel manipulator is taken as an example to validate the deduced kinematics and dynamics *** screw theory based method can simplify the kinematics and dynamics of a manipulator,also the corresponding dynamics Hessian matrix can be used to evaluate the dynamical coupling of a manipulator.

关键词： kinematics dynamics Hessian matrix parallel manipulator screw theory

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