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Copper fluoride as a low-cost sodium-ion battery cathode with high capacity

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Chinese Chemical Letters 2022年第3期33卷 1435-1438页

作者： Yiming Dai Qiujie Chen Chenchen Hu Yangyang Huang Wangyan Wu Mingliang Yu Dan Sun Wei Luo Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Haixi Institute Xiamen Institute of Rare Earth MaterialsChinese Academy of SciencesXiamen 361021China

Sodium-ion batteries (SIBs) are promising alternatives to lithium-ion batteries (LIBs) for large-scale energy storage considering the abundance and low cost of Na-containing resources. However, the energy density of SIBs has been limited by the typically low specific capacities of traditional intercalation-based cathodes. Metal fluorides, in contrast, can deliver much higher capacities based on multi-electron conversion reactions. Among metal fluorides, CuF_(2) presents a theoretical specific capacity as high as 528 mAh/g while its Na-ion storage mechanism has been rarely reported. Here, we report CuF_(2) as a SIB cathode, which delivers a high capacity of 502 mAh/g but suffers from poor electrochemical reversibility. As a solution, we adjust the cell configuration by inserting a carbon-coated separator, which hinders the transportation of dissolved Cu ions and improves the reversibility of the CuF_(2) cathode. By using in-situ XRD measurements and theoretical calculation, we propose that a one-step conversion reaction occurs during the discharge process, and a reconversion reaction competes with the oxidization of Cu to dissolved Cu ion during the charge process.

关键词： Sodium-ion battery Copper fluoride Cathode Energy density Conversion reaction

Synergistic effects of peroxydisulfate on UV/O_(3) process for tetracycline degradation:Mechanism and pathways

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Chinese Chemical Letters 2024年第10期35卷 408-413页

作者： Fengrui Yang Debing Wang Xinying Zhang Jie Zhang Zhichao Wu Qiaoying Wang State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological SecuritySchool of Environmental Science and EngineeringTongji UniversityShanghai 200092China Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology College of Environment&Safety EngineeringFuzhou University.Fuzhou 350108China

Tetracycline(TC)as a typical emerging pollutant is becoming a serious threat to the environment and human health.A combined advanced oxidation technology of UV/Ozone(O_(3))/peroxydisulfate(PDS)process was developed to explore an efficient and economic treatment process of TC in ***,the reactive sites and transformation pathways of TC were explored and the toxicity of the intermediates was quantified with a quantitative structure-activity relationship(QSAR)*** degradation performance of TC was substantially enhanced in UV/O_(3)/PDS process with a kobsof 0.0949 min-1,which was 2.3 times higher than UV/O_(3)and 3.2 times than sole *** results demonstrated that there was a superior synergistic effect of PDS on UV/O_(3)processes for the degradation of *** paramagnetic resonance(EPR)analysis and quenching experiments show that·OH,SO_(4)·-,O_(2)·-and1O_(2)all contributed to TC degradation in the UV/O_(3)/PDS process and exhibited a synergistic effect,which inhibited the generation of harmful *** addition,the UV/O_(3)/PDS system can effectively degrade TC in a wide range of substrate concentrations and pH,and also showed excellent adaptability to various concentrations of anions(Cl-and HCO_(3)-).This study proves the feasibility of UV/O_(3)/PDS process for treating TC contaminated wastewater with complicated water matrix.

关键词： UV/ozonation/peroxydisulfate Synergistic effect Tetracycline Degradation Wastewater

Selective Ni-catalyzed cross-electrophile coupling of alkynes,fluoroalkyl halides,and vinyl halides

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Chinese Chemical Letters 2022年第8期33卷 4074-4078页

作者： Yubei Dai Fang Wang Shengqing Zhu Lingling Chu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-Dimension MaterialsCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China

We report a Ni-catalyzed three-component cross-electrophile coupling of alkynes with alkenyl halides and fluoroalkyl halides to generate fluoroalkyl-incorporated 1,*** mild and operationally simple protocol is distinguished by its broad substrate scope and excellent chemo-,regio-,and stereo-selectivity,offering a new and organometallic agent-free platform for the construction of fluoroalkyl-incorporated diene *** mechanistic studies have been conducted to probe the potential reaction pathway.

关键词： Fluoroalkylation Cross-electrophile coupling Nickel catalysis Difunctionalization Alkynes

Engineering a flexible and mechanically strong composite electrolyte for solid-state lithium batteries

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Journal of Energy Chemistry 2020年第7期29卷 187-190,I0006页

作者： Tengrui Wang Ruiqi Zhang Yongmin Wu Guannan Zhu Chenchen Hu Jiayun Wen Wei Luo Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China SAIC Motor Corporation Ltd Shanghai 201804China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China

Lithium-ion batteries(LIBs)have greatly facilitated our daily lives since 1990s[1,2].To meet the ever-increasing demand on energy density,Li metal is seen as the ultimate anode because of its ultra-high specific capacity(3860 m Ah/g)and the lowest electrochemical potential(-3.04 V *** standard hydrogen electrode)[3–6].However,issues of Li metal anode,such as Li dendrite formation and large volume change during plating/stripping。

关键词： Solid-state batteries Solid polymer electrolytes Blending Li6.5La3Zr1.5Ta0.5O12 Mechanical strength

Graphene-nickel nitride hybrids supporting palladium nanoparticles for enhanced ethanol electrooxidation

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Journal of Energy Chemistry 2021年第4期30卷 48-54页

作者： Tong Wu Xiao Wang Ahmet Emrehan Emre Jinchen Fan Yulin Min Qunjie Xu Shigang Sun shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai Engineering Research Center of Energy-Saving in Heat Exchange SystemsShanghai University of Electric PowerShanghai 200090China Department of Chemical Engineering and Biointerfaces Institute University of MichiganAnn Arbor 48109MIUnited States shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

Electrocatalysts for ethanol oxidation reaction(EOR)are generally limited by their poor durability because of the catalyst poisoning induced by the reaction intermediate carbon monoxide(CO).Therefore,the rapid oxidation removal of CO intermediates is crucial to the durability of EOR-based ***,in order to effectively avoiding the catalyst CO poisoning and improve the durability,the graphene-nickel nitride hybrids(AG-Ni_(3)N)were designed for supporting palladium nanoparticles(Pd/AG-Ni_(3)N)and then used for ethanol *** density functional theory(DFT)calculations demonstrated the introduction of AG-Ni_(3)N depresses the CO absorption and simultaneously promotes the adsorption of OH species for CO oxidation *** fabricated Pd/AG-Ni_(3)N catalyst distinctively exhibits excellent electroactivity with the mass catalytic activity of 3499.5 m A mg^(-1) on EOR in alkaline media,which is around 5.24 times higher than Pd/C(commercial catalyst).Notably,the Pd/AG-Ni_(3)N hybrids display excellent stability and durability after chronoamperometric measurements with a total operation time of 150,000 s.

关键词： Graphene Pd nanoparticles Nickel nitride Ethanol electrooxidation

Catalytic asymmetric synthesis of 1,4-enynes

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Chinese Chemical Letters 2023年第8期34卷 18-27页

作者： Han-Yu Lu Zhi-Tao He CAS Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesShanghai 200032China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China

1,4-Enyne units are ubiquitous skeletons in biologically active molecules and natural ***,they represent versatile building blocks for abundant downstream derivatizations via controllable modifications of both alkene and alkyne units ***,great efforts have been made to establish efficient protocols to achieve optically active 1,*** the enormous application potential of enantioenriched 1,4-enyne units but no related review on this topic has been described,here we aim to provide a comprehensive summary on the catalytic methods established for enantioselective constructions of these intriguing *** to the reaction types,this review is divided into five parts,including asymmetric allylic substitution,asymmetric propargylic substitution,asymmetric alkynylallylic substitution,asymmetric hydroalkynylation and asymmetric 1,2-addition of alkynes to conjugated imines or ketones.

关键词： 1,4-Enynes Catalytic reaction Asymmetric synthesis

Chalcogenide Ovonic Threshold Switching Selector

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Nano-Micro Letters 2024年第5期16卷 1-40页

作者： Zihao Zhao Sergiu Clima Daniele Garbin Robin Degraeve Geoffrey Pourtois Zhitang Song Min Zhu National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China University of Chinese Academy of Sciences Beijing 100029People’s Republic of China IMEC Kapedreef 75LeuvenBelgium

Today’s explosion of data urgently requires memory technologies capable of storing large volumes of data in shorter time frames,a feat unattain-able with Flash or *** Optane,commonly referred to as three-dimensional phase change memory,stands out as one of the most promising *** Optane with cross-point architecture is constructed through layering a storage element and a selector known as the ovonic threshold switch(OTS).The OTS device,which employs chalcogenide film,has thereby gathered increased attention in recent *** this paper,we begin by providing a brief introduction to the discovery process of the OTS ***,we summarize the key elec-trical parameters of OTS devices and delve into recent explorations of OTS materials,which are categorized as Se-based,Te-based,and S-based material ***,we discuss various models for the OTS switching mechanism,including field-induced nucleation model,as well as several carrier injection ***,we review the progress and innovations in OTS mechanism ***,we highlight the successful application of OTS devices in three-dimensional high-density memory and offer insights into their promising performance and extensive prospects in emerging applications,such as self-selecting memory and neuromorphic computing.

关键词： Non-volatile memory Ovonic threshold switch(OTS) Chalcogenide Selector

Enantioselective and stereodivergent hydromonofluoroalkylation of conjugated and remote diene

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Chinese Chemical Letters 2023年第12期34卷 159-165页

作者： Qi-Ying Liao Chao Ma Yu-Chao Wang Shao-Qian Yang Jiang-Shan Ma Zhi-Tao He College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China CAS Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesShanghai200032China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China

Because of the widespread applications of optically active alkyl fluorides in medicinal and agro chem-icals,enantioselective and even stereodivergent construction of alkyl fluorides remains highly desirable but ***-metal-catalyzed asymmetric hydrofluoroalkylation of readily available di-enes represents a novel route to achieve this goal,yet receives scarce *** we report an intrigu-ing palladium-catalyzed enantioselective hydromonofluoroalkylation reaction of conjugated *** monosubstituted and internal dienes proceed well with the transformation and furnish alkyl fluorides in generally>80%yield and>90%ee.A stereodivergent hydromonofluoroalkylation protocol via Pd/Cu co-catalysis is also established for the access to all four stereoisomers of corresponding moieties bear-ing a fully-substituted F-stereogenic center and vicinal tertiary carbon *** addition,asymmetric migratory hydromonofluoroalkylation of skipped dienes is developed to realize the direct allylic C-H flu-oroalkylation.A compound library of enantioenriched cyclic fluorides is thus built to highlight the trans-formation potential of present methodology.

关键词： Hydromonofluoroalkylation Enantioselective Stereodivergent 1,3-Diene Remote diene

Surface-enhanced Raman Scattering on 2D Nanomaterials:Recent Developments and Applications

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Chinese Journal of Chemistry 2021年第3期39卷 745-756页

作者： Tingting Zheng Yan Zhou Enduo Feng Yang Tian shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of ChemistrySchool of Chemistry and Molecular EngineeringEast China Normal UniversityDongchuan Road 500Shanghai 200241China State Key Laboratory of Precision Spectroscopy East China Normal UniversityDongchuan Road 500Shanghai 200241China

Surface enhanced Raman spectroscopy(SERS)has emerged as a highly powerful and sensitive tool for molecular *** the various factors that affect SERS performance,substrate material is the most *** first observed in 1974,noble metals have been the most common substrates for ***,their increasing defects including low selectivity,weak uniformity,and poor stability are all obstacles to these noble metal-based SERS ***,due to the unique layer-dependent optical properties and a very large surface-to-volume ratio,two-dimensional(2D)nanomaterials are found to be promising candidates to overcome the shortcomings of a conventional metallic SERS ***,we concentrate on the latest development and applications of SERS-active 2D nano-materials in our group as well as in other related research *** enhancement mechanism of the SERS effect and the development of various SERS-active 2D nanomaterials have been discussed in ***,the latest development in 2D nanomaterial-SERS based analytical applications from trace detection of small organic pollutants and macromolecular biomarkers to in-situ cytosensing and in-situ theranostic analysis is introduced.

关键词： Raman spectroscopy 2D nanomaterials Heterostructures Reaction mechanisms SERS sensing