检索结果-南通市图书馆

Lithium cation-doped tungsten oxide as a bidirectional nanocatalyst for lithium-sulfur batteries with high areal capacity

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第11期98卷 406-413页

作者： Biying Wang Ke Chen Jieying Liang Zhichun Yu Da-Wei Wang Ruopian Fang School of Chemical Engineering The University of New South WalesSydneyNSW 2052Australia Faculty of materials Science and Energy Engineering Shenzhen University of Advanced TechnologyShenzhen 518055GuangdongChina institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina

Lithium-sulfur(Li-S) batteries are promising for high energy-storage applications but suffer from sluggish conversion reaction kinetics and substantial lithium sulfide(Li_(2)S) oxidation barrier,especially under high sulfur ***,we report a Li cation-doped tungsten oxide(Li_(x)WO_(x)) electrocatalyst that efficiently accelerates the S■HLi_(2)S interconversion *** incorporation of Li dopants into WO_(x) cationic vacancies enables bidirectional electrocatalytic activity for both polysulfide reduction and Li_(2)S oxidation,along with enhanced Li^(+) *** conjunction with theoretical calculations,it is discovered that the improved electrocatalytic activity originates from the Li dopant-induced geometric and electronic structural optimization of the Li_(x)WO_(x),which promotes the anchoring of sulfur species at favourable adsorption sites while facilitating the charge transfer ***,Li-S cells with the Li_(x)WO_(x) bidirectional electrocatalyst show stable cycling performance and high sulfur utilization under high sulfur *** approach provides insights into cation engineering as an effective electrocatalyst design strategy for advancing high-performance Li-S batteries.

关键词： Cation engineering Electrocatalysis Polysulfide conversion Lithium sulfide oxidation Lithium-sulfur batteries

Considerations of advanced aqueous batteries recycling:A perspective

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第6期93卷 46-54,I0002页

作者： Yun Zhao Yuqiong Kang Hao Du Feiyu Kang Baohua Li institute of materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina

*** Battery technology,serving as a basis for a rechargeable society,has developed rapidly over a century[1].The progress can be roughly divided into three stages,with the initial two mainly focusing on aqueous battery *** to 1859,research primarily focused on the conceptualization of batteries and the development of primary(non-rechargeable)cells[2].In the subsequent150 years,rechargeable battery technology emerged。

关键词： battery Battery primarily

Study on the Physiological,Cellular,and Morphological Aspects of the Postharvest Development of Cut Lily Flowers

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2021年第2期7卷 149-158页

作者： Yushan Zhang Dexin Zhong Zhanfei Liu Jiawei Gao College of materials and Food University of Electronic Science and Technology of ChinaZhongshan InstituteZhongshanGuangdong 528400China

It is of great practical significance to study the development process of cut lily for regulating flowering and *** this study,the developmental process of lily cut flower was explored from cellular,morphological,and physiological *** morphological aspect,the tepal edge grows faster than the *** midrib groove of the flowering stage is wider than that of bud *** fast-growing edge of the petals results in the midrib bending ***,the rapid growth of the stamens and stigmas also contributes to bud *** the cellular aspect,in the bud stage there were more wrinkles in the outer epidermal cell wall of the tepal than those in the inner epidermal cell wall,indicating that asymmetric structural differences exist from the beginning of lily *** a physiological aspect,from the bud cracking stage to the senescence stage,a variety of substances in the tepal cells gradually decreased,including total nitrogen,total phosphorus,total potassium,total calcium,starch,soluble sugar,and soluble protein,but not *** results indicate that the asymmetric growth caused by this structural difference is responsible for *** wrinkles in the cell wall can be regarded as indicators of senescent cells and are caused by the degradation of the cell wall and the loss of intracellular turgor *** differences in the epidermal cells between the inner and outer tepal indicated ultrastructural changes in the tepal *** bud and flowering stages are maintained by the tepals acting as a *** flowering,the tepals gradually change from a sink to a source *** of the cut lily flowers was caused by the decomposition of intracellular compounds in the tepals and the remobilization of nutrients from the tepals to the developing organs.

关键词： cut lily epidermal cell midrib tepal wrinkle

Effects of deposition parameters on microstructure and thermal conductivity of diamond films deposited by DC arc plasma jet chemical vapor deposition

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第1期19卷 131-137页

作者：瞿全炎邱万奇曾德长刘仲武代明江周克崧 School of materials Science and Engineering South China University of Technology guangdong institute of Special Equipments Inspection and Supervision Guangzhou Research institute of Non-ferrous Metals

The uniform diamond films with 60 mm in diameter were deposited by improved DC arc plasma jet chemical vapor deposition technique. The structure of the film was characterized by scanning electronic microcopy(SEM) and laser Raman spectrometry. The thermal conductivity was measured by a photo thermal deflection technique. The effects of main deposition parameters on microstructure and thermal conductivity of the films were investigated. The results show that high thermal conductivity, 10.0 W/(K·cm), can be obtained at a CH4 concentration of 1.5% (volume fraction) and the substrate temperatures of 880-920 ℃ due to the high density and high purity of the film. A low pressure difference between nozzle and vacuum chamber is also beneficial to the high thermal conductivity.

关键词：金刚石膜性能等离子喷射稳定性

Polyglutamic Acid Based Polyanionic Shielding System for Polycationic Gene Carriers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2016年第3期34卷 316-323页

作者： Jia-liang Xia 田华雨 Jie Chen Zhao-pei Guo Lin Lin Hong-yan Yang Zong-cai Feng School of Chemistry and Chemical Engineering Lingnan Normal University Research Center of Chemistry & materials Lingnan Normal University Development Center for New Materials Engineering & Technology in Universities of Guangdong Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Science

For the purpose of increasing the in vivo stability of polycation gene carriers, we prepared a kind of p H-sensitive poly（ethylene glycol）-poly（γ-benzyl-L-glutamate-co-glutamic acid）（PEG-PGA（65）, 65 denotes the molar ratio of glutamic acid in poly（γ-benzyl-L-glutamate-co-glutamic acid））. PEG-PGA（65） showed low cytotoxicity and could shield the positive charge of DNA/PEI（1：1） polyplexes efficiently. The transfection was enhanced due to the partially charge shielding in He La cell line at pH of 7.4. There was almost no transfection efficiency when the surface charge of the ternary particles turned to negative at p H of 7.4. However, the transfection efficiency recovered a lot by culturing at p H of 6.0 at the beginning of transfection. Confocal microscopic observation and flow cytometry results showed DNA/PEI polyplexes should be efficiently released and endocytosized at p H 6.0, because of the p H triggered deshielding action of PEG-PGA（65）. Due to the good biocompatibility and suitable p H triggered shielding/deshielding property, PEG-PGA（65） could be a potential shielding system for polycationic gene carriers used in vivo.

关键词： Gene delivery Shielding system PEGylation pH Sensitive

Pressure infiltration of molten aluminum for densification of environmental barrier coatings

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第1期11卷 145-157页

作者： Lin DONG Mei-Jun LIU Xiao-Feng ZHANG Xue-Shi ZHUO Jia-Feng FAN Guan-Jun YANG Ke-Song ZHOU State Key Laboratory for Mechanical Behavior ofmaterials School ofMaterials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China National Engineering Laboratory for Modern materials Surface Engineering Technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China

Environmental barrier coatings(EBCs)effectively protect the ceramic matrix composites(CMCs)from harsh engine environments,especially steam and molten ***,open pores inevitably formed during the deposition process provide the transport channels for oxidants and corrosives,and lead to premature failure of *** research work proposed a method of pressure infiltration densification which blocked these open pores in the *** results showed that it was difficult for aluminum to infiltrate spontaneously,but with the increase of external gas pressure and internal vacuum simultaneously,the molten aluminum obviously moved forward,and finally stopped infiltrating at a depth of a specific *** on the wrinkled zigzag pore model,a mathematical relationship between the critical pressure with the infiltration depth and the pore intrinsic geometry was *** infiltration results confirmed this relationship,indicating that for a given coating,a dense thick film can be obtained by adjusting the internal and external gas pressures to drive a melt infiltration.

关键词： infiltration process channel pore densification pressure assistant environmental barrier coating(EBC)

EFFECTS OF DIFFERENT FUNCTIONALIZATION SCHEMES ON THE INTERFACIAL STRENGTH OF CARBON NANOTUBE POLYETHYLENE COMPOSITE

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2015年第3期28卷 277-284页

作者： Tan Xiao Juqing Liu Huifang Xiong Architecture and Civil Engineering institute Guangdong University of Petrochemical Technology Key Laboratory of Flexible Electronics (KLOFE) & institute of Advanced materials (IAM) Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University (NanjingTech) School of Computer and Electronic Information Guangdong University of Petrochemical Technology

The mechanical performance of carbon nanotube （CNT） reinforced polymer com- posites is primarily controlled by the dispersive capacity and interracial shear strength of CNTs in polymer matrices. CNT functionalizations will improve dispersion and strengthen interracial bonding of CNTs in matrices. To understand the effects of different functionalization schemes on the interracial strength of CNT-polymer composites, pullout of the covalent, noncovalent, and mixed functionalized single-walled carbon nanotube （SWCNT） from polyethylene （PE） matrix was simulated by using molecular dynamics, respectively. The results show that the SWCNT-PE interracial shear strength is significantly improved by SWCNT functionalizations, particularly by mixed functionalization.

关键词： interracial shear strength carbon nanotubes nano composites molecular dynamics

Enhancement of blue InGaN light-emitting diodes by using AlGaN increased composition-graded barriers

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2015年第5期36卷 46-49页

作者：雷严刘志强何苗伊晓燕王军喜李晋闽郑树文李述体 guangdong Provincial Key Laboratory of Nanophotonic Functional materials and Devices Institute of Optoelectronic Materials and TechnologySouth China Normal University Center for Semiconductor Lighting Institute of SemiconductorsChinese Academy of Sciences guangdong Engineering Research Center of Optoelectronic Functional materials and Devices South China Normal University

The characteristics ofnitride-based blue light-emitting diodes （LEDs） with A1GaN composition-graded barriers are analyzed numerically. The carrier concentrations in the quantum wells （QWs）, the energy band di- agrams, the electrostatic fields, and the light output power are investigated by APSYS software. The simulation results show that the LED with AlGaN composition-graded barriers has a better performance than its AlGaN/InGaN counterpart owing to the increase of hole injection and the enhancement of electron confinement. The simulation results also suggest that the output power is enhanced significantly and the efficiency droop is markedly improved when the AIGaN barriers are replaced by AlGaN composition-graded barriers.

关键词： light-emitting diodes composition-graded barriers efficiency droop

Densely packed ultrafine SnO_(2) nanoparticles grown on carbon cloth for selective CO_(2) reduction to formate

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第8期31卷 159-166,I0005页

作者： Xuewan Wang Dan Wu Xiaomin Kang Jiujun Zhang Xian-Zhu Fu Jing-Li Luo Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060GuangdongChina School of materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205HubeiChina institute for Sustainable Energy College of SciencesShanghai UniversityShanghai 200444China

Electrochemical reduction of CO_(2) to fuels and chemicals is a viable strategy for CO_(2) utilization and renewable energy *** free-standing electrodes from robust and scalable electrocatalysts becomes highly ***,dense SnO_(2) nanoparticles are uniformly grown on three-dimensional(3D)fiber network of carbon cloth(CC)by a facile dip-coating and calcination ***,Zn modification strategy is employed to restrain the growth of long-range order of SnO_(2) lattices and to produce rich grain *** hybrid architecture can act as a flexible electrode for CO_(2)-to-formate conversion,which delivers a high partial current of 18.8 m A cm-2 with a formate selectivity of 80%at a moderate cathodic potential of-0.947 V *** electrode exhibits remarkable stability over a 16 h continuous *** superior performance is attributed to the synergistic effect of ultrafine SnO_(2) nanoparticles with abundant active sites and 3D fiber network of the electrode for efficient mass transport and electron *** sizeable electrodes hold promise for industrial applications.

关键词： Densely packed SnO_(2)nanoparticles Grain boundary Defect site Flexible electrode Electrochemical reduction CO_(2)to formate conversion