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Preface:special issue in honor of Professor Lixin Dai on the occasion of his 100th birthday

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Science China Chemistry 2023年第10期66卷 2719-2720页

作者： Yong Tang Li-jun wan State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 200032China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Science(BNLMS)Institute of ChemistryChinese Academy of SciencesUniversity of Chinese Academy of SciencesBeijing 100190China

*** Dai,a luminary in the field of chemistry,was born in Beijing on November 13,*** remarkable journey through the world of science began at Beijing Yuying Middle School in 1936 and continued as he pursued his secondary education in *** 1942,he embarked on his academic path by enrolling in the Department of Chemistry at the University of *** the next year,he transferred to Zhejiang University in Guizhou Province.

关键词： transferred continued Guizhou

Scalable and controllable synthesis of 2D high-proportion 1T-phase MoS_(2)

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Nano Research 2020年第11期13卷 2933-2938页

作者： Xiang Gao Liukang Xiong Jiabin Wu jun wan Liang Huang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Materials Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

Two-dimensional molybdenum disulfide(2D MoS_(2))is considered as a promising candidate for many applications due to its unique structure and ***,the controllable synthesis of large-scale and high-quality 2D 1T-phase MoS_(2)is still a ***,we present the scalable and controllable synthesis of 2D MoS2 from 2H to 1T@2H phase by using K_(2)SO_(4)salt as a simultaneous high-temperature sulfur source and *** as-synthesized 1T@2H-2D MoS_(2)exhibits a high yield and can be easily assembled into freestanding electrode with high specific capacitance of 434 F/g at a scan rate of 1 mV/s in LiClO_(4)ethylene carbonate/dimethyl carbonate(EC/DMC).Moreover,various single-crystal 2D transition metal sulfides(WS_(2),PbS,MnS and Ni_(9)S_(8))and 2D S-doped carbon can be synthesized using this *** believe that this study may provide a new sight for scalable and controllable synthesis of other 2D materials beyond 2D MoS_(2).

关键词： two-dimensional material MoS_(2) 1T phase scalable synthesis controllable synthesis

Preface:special topic on rechargeable battery technology

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Science China Chemistry 2024年第1期67卷 1-3页

作者： Yu-Guo Guo Qiang Zhang jun Chen Li-jun wan CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Frontiers Science Center for New Organic Matter Renewable Energy Conversion and Storage Center(RECAST)Haihe Laboratory of Sustainable Chemical TransformationsKey Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China

Rechargeable batteries play a major role in the transition from fossil energy to renewable energy and are considered the key-enabling decarbonization technology for several industries,including electronics,transportat... 详细信息

关键词： battery artificial technology

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Insights into the nitride-regulated processes at the electrolyte/electrode interface in quasi-solid-state lithium metal batteries

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Journal of Energy Chemistry 2022年第4期31卷 780-786页

作者： Jing wan wan-Ping Chen Gui-Xian Liu Yang Shi Sen Xin Yu-Guo Guo Rui Wen Li-jun wan Key Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Gel polymer electrolytes(GPEs)are one of the promising candidates for high-energy-density quasi-solid-state lithium metal batteries(QSSLMBs),for their high ionic conductivity and excellent interfacial *** comprehension of dynamic evolution and structure-reactivity correlation at the GPE/Li interface becomes ***,in situ electrochemical atomic force microscopy(EC-AFM)provides insights into the LiNO_(3)-regulated micromechanism of the Li plating/stripping processes upon cycles in GPE-based LMBs at *** additive LiNO_(3)induces the formation of amorphous nitride SEI film and facilitates Li^(+) ion *** stabilizes a compatible interface and regulates the Li nucleation/growth at steady *** deposited Li is in the shape of chunks and tightly *** Li dissolution shows favorable reversibility,which guarantees the cycling performance of *** situ AFM monitoring provides a deep understanding into the dynamic evolution of Li deposition/dissolution and the interphasial properties of tunable SEI film,regulating the rational design of electrolyte and optimizing interfacial establishment for GPE-based QSSLMBs.

关键词： In-situ electrochemical atomic force microscopy Gel polymer electrolyte Solid electrolyte interphase Lithium deposition/dissolution Quasi-solid-state lithium metal batteries

Policy and Practice Progress of Watershed Eco-compensation in China

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Chinese Geographical Science 2007年第2期17卷 179-185页

作者： ZHANG Huiyuan LIU Guihuan wanG Jinnan wan jun Chinese Academy for Environmental Planning Beijing 100012 China

The ecological protection of the watersheds in China is being confronted with a lot of problems such as soil and water erosion, water pollution at present. Therefore watershed eco-compensation is becoming a question of common interest. Based on the analyses of the major problems and their origins in the watershed protection in China, the paper discusses the concerned policies including relative rules and laws, financial policies and water right transaction policies. Simultaneously the paper reviews the practices carried out in China, including the ecological construction project in the western China, the trans-provincial eco-compensation practice and the small watershed eco-compensation practice. According to the present situation of eco-compensation practices and the future policy requirement, this paper finally puts forward four key problems to be solved in the watershed eco-compensation of China in the future.

关键词： watershed eco-compensation ecological protection

Molecular cloning and characterization of the putative Halloween gene Phantom from the small brown planthopper Laodelphax striatellus

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Insect Science 2015年第6期22卷 707-718页

作者： Shuang Jia Pin-jun wan Guo-Qing Li Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests College of Plant Protection Nanjing AgriculturalUniversity Nanjing 210095 China

Ecdysteroid hormone 20-hydroxyecdysone plays fundamental roles in in- sect postembryonic development and reproduction. Several cytochrome P450 mono- oxygenases （CYPs）, encoded by the Halloween genes, have been documented to be involved in ecdysteroidogenesis in representative insects in Diptera, Lepidoptera and Orthoptera. Here the putative Halloween gene Phantom （Phm, cyp306al） from a hemipteran insect species, the small brown planthopper Laodelphax striatellus, was cloned. LsPHM shows five insect conserved P450 motifs, that is, Helix-C, Helix-I, Helix-K, PERF and heme- binding motifs. Temporal and spatial expression patterns of LsPhm were evaluated by quantitative polymerase chain reaction. Through the fourth-instar and the early fifth-instar stages, LsPhm showed two expression peaks in day 2 and days 4-5 fourth-instar nymphs, and three troughs in day 1 and 3 fourth instars and day 1 fifth instars. On day 5 of the fourth-instar nymphs, LsPhm clearly had a high transcript level in the thorax where the prothoracic glands were located. Dietary introduction of double-stranded RNA （dsRNA） of LsPhm at the nymph stage successfully knocked down the target gene, decreased expres- sion level ofecdysone receptor （LsEcR） gene and caused a higher nymphal mortality rate and delayed development. Ingestion of 20-hydroxyecdysone on LsPhm-dsRNA-exposed nymphs did not increase LsPhm expression level, but almost completely rescued the LsEcR mRNA level, and relieved the negative effects on survival and development. Thus, our data suggest that the putative LsPhm encodes a ftmctional 25-hydroxylase that catalyzes the biosynthesis of ecdysteroids in L. striatellus.

关键词： double-stranded RNA ecdysteroidogenesis Laodelphax striatellus perfor-mance Phantom

In situ analysis of dynamic evolution of the additive-regulated cathode processes in quasi-solid-state lithium-metal batteries

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Science China Chemistry 2023年第10期66卷 2921-2928页

作者： Jian-Xin Tian Hui-Juan Guo Jing wan Gui-Xian Liu Rui Wen Li-jun wan CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The implementation of high-energy-density storage devices can be facilitated by the built-in situ cathode electrolyte interphase(CEI)between Ni-rich cathodes and gel polymer electrolytes,as it improves interfacial compatibility and enhances *** the interphase processes of cathode materials,including the structural evolution and the formation of cathode electrolyte interphase upon charging/discharging,is crucial for the design of solid-state lithium ***,we employed in situ atomic force microscopy(AFM)to investigate the effects of lithium difluoro(oxalato)borate(Li DFOB)on the dynamic evolution of the cathode *** the presence of Li DFOB,the adhesion of nanoparticles and a thin amorphous film on the cathode surface resulted in the formation of a homogeneous CEI,inducing the production of LixPFyas ***,the stable CEI formed between the cathode and electrolyte helps maintain the integrity of the composition and structure,reduces interfacial resistance,and improves the cycle stability of the *** visualization of in situ AFM in quasi-solid-state lithium-metal batteries provides valuable insights into the distinct nanostructures and growth dynamics of Li DFOB-mediated CEI on the LiNi_(6)Co_(2)Mn_(2)O_(2) cathode,thus offering a universal and convenient technique for interfacial analysis and a mechanistic understanding of solid-state batteries.

关键词： atomic force microscopy electrochemistry interfacial dynamics solid-state lithium batteries cathode electrolyte interphase

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Improved Algorithm for Broadcast Scheduling of Minimal Latency in Wireless Ad Hoc Networks

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Acta Mathematicae Applicatae Sinica 2010年第1期26卷 13-22页

作者： Wei-ping Shang Peng-jun wan Xiao-dong Hu Department of Mathematics Zhengzhou University Zhengzhou 450052 China Department of Computer Science Illinois Institute of Technology Chicago IL 60616 USA Institute of Applied Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

A wide range of applications for wireless ad hoc networks are time-critical and impose stringent requirement on the communication latency. One of the key communication operations is to broadcast a message from a source node. This paper studies the minimum latency broadcast scheduling problem in wireless ad hoc networks under collision-free transmission model. The previously best known algorithm for this NP-hard problem produces a broadcast schedule whose latency is at least 648（rmax/rmin）^2 times that of the optimal schedule, where rmax and rmin are the maximum and minimum transmission ranges of nodes in a network, respectively. We significantly improve this result by proposing a new scheduling algorithm whose approximation performance ratio is at most （1 ＋ 2rmax/rmin）^2＋32, Moreover, under the proposed scheduling each node just needs to forward a message at most once.

关键词： Broadcast latency wireless ad hoc networks approximation algorithm

Effect of cations in ionic liquids on the electrochemical performance of lithium-sulfur batteries

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Science China Chemistry 2014年第11期57卷 1564-1569页

作者： YAN Yang YIN YaXia GUO YuGuo wan Li-jun Beijing National Laboratory for Molecular Science Institute of Chemistry Chinese Academy of Sciences (CAS)

Lithium-sulfur(Li-S) battery is a promising choice for the next generation of high-energy rechargeable batteries, but its application is impeded by the high dissolution of the polysulfides in commonly used organic electrolyte. Room temperature ionic liquids(RTILs) have been considered as appealing candidates for the electrolytes in Li-S batteries. We investigated the effect of cations in RTILs on the electrochemical performance for Li-S batteries. Ex situ investigation of lithium anode for Li-S batteries indicates that during the discharge/charge process the RTIL with N-methyl-N-propylpyrrolidine cations(P13) can effectively suppress the dissolution of the polysulfides, whereas the RTIL with 1-methyl-3-propyl imidazolium cation(PMIM) barely alleviates the shuttling problem. With 0.5 mol L-1 LiTFSI/P13 TFSI as the electrolyte of Li-S battery, the ketjen black/ sulfur cathode material exhibits high capacity and remarkable cycling stability, which promise the application of the P13-based RTILs in Li-S batteries.

关键词： lithium-sulfur batteries electrolyte P13TFSI PMIMTFSI polysulfides