检索结果-南通市图书馆

Strengthen metal-oxygen covalency of CoFe-layered double hydroxide for efficient mild oxygen evolution

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第1期15卷 162-169页

作者： Dazhong Zhong Tan li Dong Wang lina li Jiancheng Wang Genyan Hao Guang liu Qiang zhao Jinping li College of Chemistry and Chemical Engineering Taiyuan University of TechnologyShanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan 030024China School of Environment and Energy South China University of TechnologyGuangzhou 51006China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteShanghai 200000China Key Laboratory of Coal Science and Technology Taiyuan University of TechnologyMinistry of Education and Shanxi ProvinceTaiyuan 030024China

Oxygen evolution reaction(OER)is crucial for hydrogen production as well as other energy storage ***-layered double hydroxide(CoFe-OH)has been widely considered as one of the most efficient electrocatalysts for OER in basic aqueous ***,it still suffers from low activity in neutral *** paper describes partially oxidized CoFe-OH(PO-CoFe-OH)with enhanced covalency of M-O bonds and displays enhanced OER performance under mild *** studies reveal the suitably enhanced M-O covalency in PO-CoFe-OH shifts the OER mechanism to lattice oxygen oxidation mechanism and also promotes the rate-limiting deprotonation,providing superior OER *** just requires the overpotentials of 186 and 365 mV to drive the current density densities of 1 and 10 mA·cm^(-2) in 0.1 M KHCO_(3) aqueous solution(pH=8.3),*** provides a new process for rational design of efficient catalysts for water oxidation in mild conditions.

关键词： lattice oxygen oxidation metal-oxygen covalency neutral oxygen evolution reaction

Nanomaterial libraries and model organisms for rapid high-content analysis of nanosafety

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

National Science Review 2018年第3期5卷 365-388页

作者： Yiye li Jing Wang Feng zhao Bing Bai Guangjun Nie André E.Nel Yuliang zhao CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Division of Nano Medicine Department of Medicine and California Nano Systems Institute University of California

Safety analysis of engineered nanomaterials(ENMs) presents a formidable challenge regarding environmental health and safety, due to their complicated and diverse physicochemical *** large amounts of data have been published regarding the potential hazards of these materials, we still lack a comprehensive strategy for their safety assessment, which generates a huge workload in decision-making. Thus, an integrated approach is urgently required by government, industry, academia and all others who deal with the safe implementation of nanomaterials on their way to the marketplace. The rapid emergence and sheer number of new nanomaterials with novel properties demands rapid and high-content screening(HCS), which could be performed on multiple materials to assess their safety and generate large data sets for integrated decision-making. With this approach, we have to consider reducing and replacing the commonly used rodent models, which are expensive, time-consuming, and not amenable to high-throughput screening and analysis. In this review, we present a ‘library Integration Approach’ for high-content safety analysis relevant to the ENMs. We propose the integration of compositional and property-based ENM libraries for HCS of cells and biologically relevant organisms to be screened for mechanistic biomarkers that can be used to generate data for HCS and decision analysis. This systematic approach integrates the use of material and biological libraries, automated HCS and high-content data analysis to provide predictions about the environmental impact of large numbers of ENMs in various categories. This integrated approach also allows the safer design of ENMs, which is relevant to the implementation of nanotechnology solutions in the pharmaceutical industry.

关键词： analysis method nanosafety assessment library integration approach high-content screening nanomaterials

Engineering sulfur vacancies for boosting electrocatalytic reactions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第9期34卷 34-44页

作者： Xianxu Chu Yueyu liao lu Wang Junru li Hui Xu Henan Key Laboratory of Biomolecular Recognition and Sensing College of Chemistry and Chemical EngineeringShangqiu Normal UniversityShangqiu 476000China Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation CenterChangzhou UniversityChangzhou 213164China

Transition metal sulfides are demonstrated to play an increasingly important role in boosting the deployment of ecofriendly electrocatalytic energy conversion *** is also widely recognized that the introduction of vacancies is now becoming an important and valid approach to promote the electrocatalytic *** this review,the significance of sulfur vacancies on the enhancement of catalytic performance via four main functionalities,including tuning the electronic structure,tailoring the active sites,improving the electrical conductivity,and regulating surface reconstruction,is comprehensively *** effective strategies for the sulfur vacancy engineering,such as plasma treatment,heteroatom doping,and chemical reduction are also comprehensively ***,recent achievements in sulfur vacancy fabrication on various hotspot electrocatalytic reactions are also systematically ***,a summary of the recent progress and challenges of this interesting field are organized,which hopes to guide the future development of more efficient metal sulfide electrocatalysts.

关键词： Sulfur vacancy Electrocatalytic reactions Functionalities Surface properties Energy conversion

Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980℃

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 857-862页

作者： Ye-Bing Hu li Zhang Cong-Qian Cheng Peng-Tao zhao Guang-Ping Guo Jie zhao School of Materials Science and Engineering DalianUniversity of TechnologyDalian 116024China Beijing Institute of Aeronautical Materials Beijing 100095China

The isothermal oxidation behavior of the nickel-based superalloy DZ125 was investigated at 980 ~C through SEM/EDX and XRD. The weight loss process exhibited three periods--initial, transient and steady stages, which corre- spond to the formation of three layers on the surface. The outer layer was composed of NiO, whereas the intermediate layer mainly consisted of spinels and was accompanied with Ta-rich oxide. Alumina was evident as the inner continuous layer close to the substrate. The first formation of alumina was responsible for the initial stage of weight loss, and the formation of NiO and intermediate layer may dramatically affect on the transient and steady stage, respectively. The oxide scales effect on growth mechanism was discussed.

关键词： Nickel-based Superalloy Oxidation Alumina

Different oxidation routes for lattice oxygen recovery of double-perovskite type oxides LaSrFeCoO6 as oxygen carriers for chemical looping steam methane reforming

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2017年第3期26卷 501-509页

作者： Kun zhao Yang Shen Zhen Huang Fang He Guoqiang Wei Anqing Zheng Haibin li Zengli zhao Key Laboratory of Renewable Energy Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640GuangdongChina Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640GuangdongChina University of Chinese Academy of Sciences Beijing 100049China

Double-perovskite type oxide LaSrFeCoO（LSFCO） was used as oxygen carrier for chemical looping steam methane reforming（CL-SMR） due to its unique structure and reactivity. Two different oxidation routes,steam-oxidation and steam-air-stepwise-oxidation, were applied to investigate the recovery behaviors of the lattice oxygen in the oxygen carrier. The characterizations of the oxide were determined by X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）, hydrogen temperature-programmed reduction（H-TPR） and scanning electron microscopy（SEM）. The fresh sample LSFCO exhibits a monocrystalline perovskite structure with cubic symmetry and high crystallinity, except for a little impurity phase due to the antisite defect of Fe/Co disorder. The deconvolution distribution of XPS patterns indicated that Co,and Fe are predominantly in an oxidized state(Feand Fe) and(Coand Co), while O 1s exists at three species of lattice oxygen, chemisorbed oxygen and physical adsorbed oxygen. The double perovskite structure and chemical composition recover to the original state after the steam and air oxidation, while the Co ion cannot incorporate into the double perovskite structure and thus form the CoO just via individual steam oxidation. In comparison to the two different oxidation routes, the sample obtained by steam-oxidation exhibits even higher CHconversion, CO and Hselectivity and stronger hydrogen generation capacity.

关键词： Double-perovskite Chemical looping Lattice oxygen Oxidizing agent Redox

A Differential Game Based Approach Against Objective Function Attack in Cognitive Networks

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2018年第4期27卷 879-888页

作者： FENG Guangsheng liN Junyu zhao Qian WANG Huiqiang LYU Hongwu zhao Xiaoyu HAN Jizhong li Bingyang College of Computer Science and Technology Harbin Engineering University Institute of Information Engineering Chinese Academy of Sciences School of Computer and Information Engineering Harbin University of Commerce

We study the problem of defense strategy against Objective function attack(OFA) in Cognitive networks(CNs), where the network can be operated at the optimal state by adapting the parameters of its objective function. An OFA attacker can disrupt the parameter adaptation by interfering measures, which results in some operating parameters of the objective function deviating from their optimal settings. We first model the interactive process between the OFA attacker and defense system using differential game theory, and propose a defense strategy by introducing a new metric, namely, threat factor. Then,we obtain the optimal defense strategy by proving the existence of the saddle point of the proposed model. Moreover,this defense strategy is scale-free such that it can conquer a large number of OFAs in a decentralized way. Finally, we conduct extensive simulations to show that the proposed approach is effective.

关键词： Cognitive networks Objective function Operating parameter Saddle point

Secondary Aggregation Induced by Volatile Additive for Improved Exciton Diffusion and Charge Separation in High Efficiency Organic Photovoltaic Devices

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第22期42卷 2825-2832页

作者： Yufeng Ge Xuewu li Mingxu Zhou Peng lu Xiaotao Hao School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinanShandong 250100China schoolof Physics National Demonstration Center for Experimental Physics EducationShandong University JinanShandong 250100 China ARC Centre of Excelence in Exciton Science Schoolof ChemistryThe Universityof MebourneParkvilleVictoria 31Australia

Comprehensive Summary The morphology of the active layer plays a crucial role in the performance of organic *** volatile additives are commonly used to manipulate the morphology,their mechanism of action remains poorly *** this study,we conducted a systematic exploration of the mechanism of the traditional volatile additive 1-CN in film formation kinetics of typical PM6:Y6 *** found that 1-CN induces a secondary aggregation effect,improving film morphology and promoting face-on crystalline *** elucidating its impact on exciton dynamics,we established a link between morphology optimization and increased exciton diffusion length and accelerated charge *** findings unveil the unique mechanism of action of volatile additive,providing a new perspective for improving the morphology and enhancing the performance of organic photovoltaic devices.

关键词： Organic photovoltaics Volatile additive Exciton diffusion Charge separation Hole transfer Morphology control Photophysics Kinetics π-πStacking Time-resolved spectroscopy Adsorption

Microstructure and mechanical properties of transient liquid phase bonding Ti_(3)SiC_(2) ceramic to SUS430 steel using an Al interlayer

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 Iron and Steel Research International 2024年第10期31卷 2475-2488页

作者： Jing-xiang zhao Xi-chao li Jing Shi Qiang Cheng Bin Xu Ming-yue Sun li-li Zheng College of Mechanical and Electrical Engineering Qingdao UniversityQingdao266071ShandongChina National Engineering Research Centre for Intelligent Electrical Vehicle Power System(Qingdao) Qingdao UniversityQingdao266071ShandongChina School of Materials Science and Engineering Ocean University of ChinaQingdao266100ShandongChina Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina

Ti_(3)SiC_(2) ceramic and SUS430 ferritic stainless steel were welded by the transient liquid phase(TLP)diffusion bonding method using an Al interlayer at 850-1050℃ in *** evolution of phase and morphology at the interface and bonding strength were systematically *** results show that Ti_(3)SiC_(2) and SUS430 were well bonded at 900-950℃.Three reaction zones were observed at the *** the joint interface area adjacent to alloy,the alloy completely reacted with liquid Al to form Al_(86)Fe_(14).At Ti_(3)SiC_(2)/Al interface,Ti and Si diffused outward from Ti_(3)SiC_(2) into the molten Al to form Fe_(3)Al+Al_(5)FeSi+TiAl_(3) *** to Ti_(3)SiC_(2) matrix,Ti_(3)Si(Al)C_(2)+TiCx zone was formed by the loss of *** evolution mechanism of TLP-bonded joints was discussed based on the interface microstructure and product *** addition,the tensile strength of the joint increased with increasing bonding *** corresponding maximum value of 59.7 MPa was obtained from SUS430/Al(10μm)/Ti_(3)SiC_(2) joint prepared at 950℃.

关键词： Ti_(3)SiC_(2)ceramic SUS430 ferritic stainless steel Transient liquid phase bonding technique Microstructure Mechanical property

Hydraulic role in differential stomatal behaviors at two contrasting elevations in three dominant tree species of a mixed coniferous and broad-leaved forest in low subtropical China

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

Forest Ecosystems 2023年第1期10卷 102-112页

作者： liwei Zhu Tianyu Fu Jie Du Weiting Hu Yanqiong li Xiuhua zhao Ping zhao South China Botanical Garden Chinese Academy of SciencesGuangzhou510650China

Quantifying the variation in stomatal behavior and functional traits of trees with elevation can provide a better understanding of the adaptative strategies to a changing climate. In this study, six water-and carbon-related functional traits were examined for three dominant tree species, Schima superba, Pinus massoniana and Castanopsis chinensis, in a mixed coniferous and broad-leaved forest at two elevations(70 and 360 m above sea level,respectively) in low subtropical China. We hypothesized that trees at higher elevations would develop more efficient strategies of stomatal regulations and greater water transport capacity to cope with more variable hydrothermal conditions than those at lower elevations. Results show that the hydraulic conductivity did not differ between trees at the two elevations, contrary to our expectation. The C. chinensis trees had greater values of leaf mass per unit area(LMA), and the S. superba and C. chinensis trees had greater values of wood density(WD),relative stem water content(RWC), and ratio of sapwood area to leaf area(Hv) at the 360-m elevation than at 70-m elevation. The mean canopy stomatal conductance was greater and more sensitive to vapor deficit pressure at360 m than at 70 m for both S. superba and C. chinensis, while stomatal sensitivity did not differ between the two contrasting elevations for P. massoniana. The midday leaf water potential(ψL) in P. massoniana was significantly more negative at 360 m than at 70 m, but did not vary with increasing elevation in both S. superba and C. *** in Hvcan be related to the differential stomatal behaviors between the two elevations. The variations of stomatal behavior and ψLwith elevation suggested the isohydric strategy for the two broad-leaved species and the anisohydric strategy for the conifer species. The species-specific differences in LMA, WD, RWC, and Hvbetween the two elevations may reflect conservative resource use strategies at the higher elevation. Our find

关键词： Sap flux Stomatal conductance Leaf water potential Vapor pressure deficit Elevation Low subtropical China