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Coupling Sb_(2)WO_(6)microflowers and conductive polypyrrole for efficient potassium storage by enhanced conductivity and K^(+) diffusivity

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Journal of Energy Chemistry 2024年第2期89卷 250-258,I0007页

作者： Ruiqi Tian Hehe Zhang Zeyu Yuan Yuehua Man jianlu sun Jianchun Bao Ming-Sheng Wang Xiaosi Zhou School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023JiangsuChina State Key Lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005FujianChina

Although metal oxide compounds are considered as desirable anode materials for potassium-ion batteries(PIBs)due to their high theoretical capacity,the large volume variation remains a key issue in realizing metal oxide anodes with long cycle life and excellent rate property.In this study,polypyrroleencapsulated Sb_(2)WO_(6)(denoted Sb_(2)WO_(6)@PPy)microflowers are synthesized by a one-step hydrothermal method followed by in-situ polymerization and coating by pyrrole.Leveraging the nanosheet-stacked Sb_(2)WO_(6)microflower structure,the improved electronic conductivity,and the architectural protection offered by the PPy coating,Sb_(2)WO_(6)@PPy exhibits boosted potassium storage properties,thereby demonstrating an outstanding rate property of 110.3 m A h g^(-1)at 5 A g^(-1)and delivering a long-period cycling stability with a reversible capacity of 197.2 m A h g^(-1)after 500 cycles at 1 A g^(-1).In addition,the conversion and alloying processes of Sb_(2)WO_(6)@PPy in PIBs with the generation of intermediates,K_(2)WO_(4)and K_(3)Sb,is determined by X-ray photoelectron spectroscopy,transmission electron microscopy,and exsitu X-ray diffraction during potassiation/depotassiation.Density functional theory calculations demonstrate that the robust coupling between PPy and Sb_(2)WO_(6)endues it with a much stronger total density of states and a built-in electric field,thereby increasing the electronic conductivity,and thus effectively reduces the K^(+)diffusion barrier.

关键词： Sb_(2)WO_(6) Polypyrrole coating Anode Potassium-ion battery In-situ TEM observation

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Templated synthesis of imine-based covalent organic framework hollow nanospheres for stable potassium-ion batteries

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Chinese Chemical Letters 2023年第7期34卷 274-278页

作者： jianlu sun Ruiqi Tian Yuehua Man Yating Fei Xiaosi Zhou School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023China

Covalent organic frameworks(COFs), as highly tunable porous crystalline materials, have promising applications in potassium-ion batteries(PIBs) due to their abundant charge carrier transport channels and excellent structural stability. However, the excessive stacking of interlayer electron clouds makes it difficult to expose internal active sites. Strategies to design functional COFs with controllable morphology and copious active sites are promising but still challenging. Herein, by utilizing the condensation between1,3,5-triformylbenzene(TFB) and p-phenylenediamine(PPD) and using amino-modified SiO_(2) nanospheres as templates, we synthesize core-shell NH_(2)-SiO_(2)@TP-COF. Through NaOH etching of NH_(2)-SiO_(2)@TP-COF, we obtain imine-based TP-COF hollow nanospheres, which shows excellent potassium storage performance when applied to the anode for PIBs. Ex-situ analysis and density functional theory calculations reveal that C=N groups and benzenes are active sites for K^(+) storage.

关键词： Potassium ion batteries Anode Covalent organic framework Templated synthesis Hollow nanospheres

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Coupling Ternary Selenide SnSb_(2)Se_(4) with Graphene Nanosheets for High-Performance Potassium-Ion Batteries

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Energy & Environmental Materials 2023年第4期6卷 280-288页

作者： Ruiqi Tian Liping Duan Yifan Xu Yuehua Man jianlu sun Jianchun Bao Xiaosi Zhou School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023China

Although chalcogenide anodes possess higher potassium storage capacity than intercalated-based graphite,their drastic volume change and the irreversible electrochemical reactions still hinder the effective electron/ion transfer during the potassiation/depotassiation process.To solve the above problems,this article proposes the synthesis of a lamellar nanostructure where graphene nanosheets are embedded with SnSb_(2)Se_(4)nanoparticles(SnSb_(2)Se_(4)/GNS).In the product,fine monodisperse SnSb_(2)Se_(4)nanoparticles are coupled with graphene nanosheets to form a porous network framework,which can effectively mitigate the drastic volume changes during electrode reactions and guarantee efficient potassium-ion storage through the synergistic interactions among multiple elements.Various electrochemical analyses prove that SnSb_(2)Se_(4)inherits the advantages of the binary Sb2Se3 and SnSe while avoiding their disadvantages,confirming the synergistic effect of the ternary–chalcogenide system.When tested for potassium storage,the obtained composite delivers a high specific capacity of 368.5 mAh g^(-1)at 100 mA g^(-1)and a stable cycle performance of 265.8 mAh g^(-1)at 500 mA g^(-1)over 500 cycles.Additionally,the potassium iron hexacyanoferrate cathode and the SnSb_(2)Se_(4)/GNS anode are paired to fabricate the potassium-ion full cell,which shows excellent cyclic stability.In conclusion,this strategy employs atomic doping and interface interaction,which provides new insights for the design of high-rate electrode materials.

关键词： anode ex situ XRD potassium-ion battery SnSb_(2)Se_(4) synergistic effect

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Recent Advances in Covalent Organic Framework Electrode Materials for Alkali Metal-Ion Batteries

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CCS Chemistry 2023年第6期5卷 1259-1276页

作者： jianlu sun Yifan Xu Yanqi Lv Qichun Zhang Xiaosi Zhou1 School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023 Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SAR 999077 Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongKowloonHong Kong SAR 999077

Owing to the shortcomings of traditional electrode materials in alkalimetal-ion batteries(AIBs),such as limited reversible specific capacity,low power density,and poor cycling performance,it is particularly important to develop new electrode materials.Covalent organic frameworks(COFs)are crystalline porous polymers that incorporate organic building blocks into their periodic structures through dynamic covalent bonds.COFs are superior to organic materials because of their high designability,regular channels,and stable topology.Since the first report of D_(TP)-A_(NDI)-COF as a cathode material for lithium-ion batteries in 2015,research on COF electrode materials has made continuous progress and breakthroughs.This review briefly introduces the characteristics and current challenges associated with COF electrode materials.Furthermore,we summarize the basic reaction types and active sites according to the categories of covalent bonds,including B–O,C=N,C–N,and C=C.Finally,we emphasize the perspectives on basic structure and morphology design,dimension and size design,and conductivity improvement of COFs based on the latest progress in AIBs.We believe that this review provides important guidelines for the development of high-efficiency COF electrode materials and devices for AIBs.

关键词： covalent organic frameworks alkali metal-ion batteries electrochemically active sites synthesis strategies high efficiency

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Construction of CoS_(2) nanoparticles embedded in well-structured carbon nanocubes for high-performance potassium-ion half/full batteries

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Science China Chemistry 2021年第8期64卷 1401-1409页

作者： Yifan Xu jianlu sun Yanan He Jianbo Li Jianzhi Xu Yingying sun Jiaying Liao Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing210023China

Metal sulfides have been widely investigated as promising electrode materials for potassium-ion batteries(PIBs)due to their high theoretical capacities.However,the practical application of metal sulfides in PIBs is still hindered by their intrinsic shortcomings of low conductivity and severe volume changes during the potassiation/depotassiation process.Herein,a simple template-based two-step annealing strategy is proposed to impregnate CoS_(2) nanoparticles in the well-structured carbon nanocubes(denoted CoS_(2)/CNCs)as an advanced anode material for PIBs.The ex-situ XRD measurements reveal the K+storage mechanism in CoS_(2)/CNCs.Benefiting from the unique structures,including abundant active interfacial sites,high electronic conductivity,and significantly alleviated volume variation,CoS_(2)/CNCs present a high specific capacity(537.3 mAh g^(−1) at 0.1 A g^(−1)),good cycling stability(322.4 mAh g^(−1) at 0.5 A g^(−1) after 300 cycles),and excellent rate capability(153.1 mAh g^(−1) at 5 A g^(−1)).Moreover,the obtained nanocomposite shows superior potassium storage properties in K-ion full cells when it is coupled with a KVPO4F cathode.

关键词： CoS_(2)nanoparticles carbon nanocubes potassium-ion batteries anode full cell

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Construction of CoS;nanoparticles embedded in well-structured carbon nanocubes for high-performance potassium-ion half/full batteries

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Science China Chemistry 2021年

作者： Yifan Xu jianlu sun Yanan He Jianbo Li Jianzhi Xu Yingying sun Jiaying Liao Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University

Metal sulfides have been widely investigated as promising electrode materials for potassium-ion batteries（PIBs） due to their high theoretical capacities. However, the practical application of metal sulfides in PIBs is still hindered by their intrinsic shortcomings of low conductivity and severe volume changes during the potassiation/depotassiation process. Herein, a simple template-based two-step annealing strategy is proposed to impregnate CoS;nanoparticles in the well-structured carbon nanocubes（denoted CoS;/CNCs） as an advanced anode material for PIBs. The ex-situ XRD measurements reveal the K+storage mechanism in CoS;/CNCs. Benefiting from the unique structures, including abundant active interfacial sites, high electronic conductivity, and significantly alleviated volume variation, CoS;/CNCs present a high specific capacity(537.3 m Ah g;at0.1 A g;), good cycling stability(322.4 mAh g;at 0.5 A g;after 300 cycles), and excellent rate capability(153.1 m Ah g;at5 A g;). Moreover, the obtained nanocomposite shows superior potassium storage properties in K-ion full cells when it is coupled with a KVPO;F cathode.

关键词： CoS nanoparticles carbon nanocubes potassium-ion batteries anode full cell

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Characterization of atomic defects on the photoluminescence in two-dimensional materials using transmission electron microscope

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InfoMat 2019年第1期1卷 85-97页

作者： Jiayan Zhang Ye Yu Peng Wang Chen Luo Xing Wu Ziqi sun jianlu Wang Wei Da Hu Guozhen Shen Department of Electronic Engineering Shanghai Key Laboratory of Multidimensional Information ProcessingEast China Normal UniversityShanghaiChina State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyGardens PointBrisbaneAustralia State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijingChina

Two-dimensional material(2D)that possesses atomic thin geometry and remarkable properties is a star material for the fundamental researches and advanced applications.Defects in 2D materials are critical and fundamental to understand the chemical,physical,and optical properties.Photoluminescence arises in 2D materials owing to various physical phenomena including activator/dopant-induced luminescence and defect-related emissions,and so forth.With the advanced transmission electron microscopy(TEM)technologies,such as aberration correction and low voltage technologies,the morphology,chemical compositions and electronic structures of defects in 2D material could be directly characterized at the atomic scale.In this review,we introduce the applications of state-of-the-art TEM technologies on the studies of the role of atomic defects in the photoluminescence characteristics in 2D material.The challenges in spatial and time resolution are also discussed.It is proved that TEM is a powerful tool to pinpoint the relationship between the defects and the photoluminescence characteristics.

关键词： defects optoelectronic photoluminescence transmission electron microscopy two-dimensional material

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Large-area high quality PtSe2 thin film with versatile polarity

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InfoMat 2019年第2期1卷 260-267页

作者： Wei Jiang Xudong Wang Yan Chen Guangjian Wu Kun Ba Ningning Xuan Yangye sun Peng Gong Jingxian Bao Hong Shen Tie Lin Xiangjian Meng jianlu Wang Zhengzong sun National Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina University of Chinese Academy of Sciences BeijingChina Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghaiChina Department of Chemistry Shanghai UniversityShanghaiChina

Two-dimensional(2D)materials have attracted increasing attention for their outstanding structural and electrical properties.However,for mass-production of field effect transistors(FETs)and potential applications in integrated circuits,large-area and uniform 2D thin films with high mobility,large on-off ratio,and desired polarity are needed to synthesize firstly.Here,a transfer-free growth method for platinum diselenide(PtSe2)films has been developed.The PtSe2 films have been synthesized with various thicknesses in centimeter-sized scale.Typical FET made from a few layer PtSe2 show p-type unipolar,with a high field-effect hole mobility of 6.2 cm^(2) V^(−1) s^(−1) and an on-off ratio of 5×10^(3).The versatile semimetal-unipolar-ambipolar transition in synthesized PtSe2 films is also firstly observed as the thickness thinning.This work realizes the large-scale preparation of PtSe2 with prominent electrical properties and provides a new strategy for polarity's modulation.

关键词： 2D materials large-area platinum diselenide polarity

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A Study of Histology and Enzymatic Histochemistry on Rabbit's Retina in Acute Ocular Hypertension

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眼科学报 1994年第3期10卷 144-150页

作者： Weirong sun, Shumei Wang, Guiqiu Zhao, jianlu Gao, Fangyi LiuThe Department of Ophthalmology, The Affilliated Hospital of Qingdao Medical College Qingdao 266003, China Department of Ophthalmology Affilliated Hospital of Qingdao Medical College China.

The changes of activities of enzymes relating to energy metabolism in rabbit's retina in acute ocular hypertension were observed. The activities of succinate dehydrogenase and adenosine triphosphatase were found to be reduced, while the activities of the lactatic dehydrognease and glucose-6-phosphatase increased. The results revealed the metabolic disturbance of energy in retina after acute ocular hypertension might be the underlying factors relating to the defects of the functions and structures of the...

关键词： acute ocular hypertension retina enzymes histochemistry

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Preparation of La0.67Ca0.23Sr0.1MnO3 thin films with interesting electrical and magnetic properties via pulsed-laser deposition

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Science China(Physics,Mechanics & Astronomy) 2017年第2期60卷 72-75页

作者： Shuai Xue XiaoLin Zhao jianlu Wang BoBo Tian Hai Huang CaiMin Meng Lan Liu Lei Ye JingLan sun XiangJian Meng XiaoDong Zhang JunHao Chu Department of Applied Physics Donghua University Shanghai 201620 China National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China University of Chinese Academy of Sciences Beijing 100049 China Department of Electronics Engineering The Chinese University of Hong Kong Hong Kong China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China

Manganese oxides with a perovskite-type Re_(1-x)D_xMnO_3(Re:heavy rare-earth elements,D:divalent alkali metal)structure have attracted interest because of the complex interaction between their electrons,lattices,and spins[1-5].Generally,manganese oxides with the structure Re_(1-x)D_xMnO_3 have special properties.For example,the half-metallic manganites,such as La_(2/3)Sr_(1/3)MnO_3 and La_(2/3)Ca_(1/3)MnO_3,wherein the conduction electrons are completely spin polarized。

关键词： La2/3Ca1/3MnO3 沉积薄膜脉冲激光磁学性能钙钛矿型锰氧化物制备电学自旋极化

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