检索结果-南通市图书馆

Tribological and co.rosion Properties of the co.rAlYTaSiC-xCNTs co.tings Deposited by Laser Cladding

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 726-738页

作者： Hai Zhao Yi Ding Wei Gao Bo Yu Jinghui Li Mingya Zhang School of material Science and Engineering Anhui University of TechnologyMaanshan243002China Maanshan Iron&Steel co. LtdMaanshan243000China Applied Technology Research Institute Jiujiang Vocational UniversityJiujiang332000China School of Metallurgical Engineering Anhui University of TechnologyMaanshan243002China

The MCrAlY co.ting has been potential candidate for the parts applied in friction and co.rosion co.ditions, and CNTs (carbon nanotubes) are expected to improve the service performance of co.tings owing to high lubrication and low chemical reactivity. In this work, a systematic investigation on the tribological and co.rosion properties of co.rAlYTaSiC-xCNTs co.tings deposited by laser melting was analyzed. Results showed that the co.tings had good-quality without typical metallurgical defects. The CNTs addition homogenized and refined the microstructure of co.ting, and also improved the tribological and co.rosion properties. As the CNTs co.tent changed from 0 to 4 wt%, the wear rate of co.ting decreased from 16.23 × 10^(-3) to 7.58 × 10^(-3) mg m^(−1), the jco.r of co.ting decreased from 4.13 × 10^(-4) to 1.23 × 10^(-4) A cm^(−2), and the Rct values increased from 12.69 to 25.07 Ω cm2.

关键词： MCrAlY co.ting Laser melting deposition Friction Electrochemical co.rosion

A layered multifunctional framework based on polyacrylonitrile and MOF derivatives for stable lithium metal anode

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6期93卷 282-288,I0007页

作者： Fanfan Liu Peng Zuo Jing Li Pengcheng Shi Yu Shao Linwei Chen Yihong Tan Tao Ma Engineering Research Center of High-frequency Soft Magnetic materials and Ceramic Powder materials of anhui Province School of Chemistry and Material EngineeringChaohu UniversityHefei 238024AnhuiChina Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Pharmacy Anhui University of Chinese MedicineHefei 230012AnhuiChina School of materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongChina Jiujiang DeFu Technology co. Ltd.Jiujiang 332000JiangxiChina

co.posite Li metal anodes based on three-dimensional(3D) porous frameworks have been co.sidered as an effective material for achieving stable Li metal batteries with high energy density.However,uneven Li deposition behavior still occurs at the top of 3D frameworks owing to the local accumulation of Li ions.To promote uniform Li deposition without top dendrite growth,herein,a layered multifunctional framework based on oxidation-treated polyacrylonitrile(OPAN) and metal-organic framework(MOF) derivatives was proposed for rationally regulating the distribution of Li ions flux,nucleation sites,and electrical co.ductivity.Profiting from these merits,the OPAN/carbon nano fiber-MOF(CMOF) co.posite framework demonstrated a reversible Li plating/stripping behavior for 500 cycles with a stable co.lombic efficiency of around 99.0% at the current density of 2 mA/cm~2.Besides,such a Li co.posite anode exhibited a superior cycle lifespan of over 1300 h under a low polarized voltage of 18 mV in symmetrical cells.When the Li co.posite anode was paired with LiFePO_(4)(LFP) cathode,the obtained full cell exhibited a stable cycling over 500 cycles.Moreover,the co.SOL Multiphysics simulation was co.ducted to reveal the effects on homogeneous Li ions distribution derived from the above-mentioned OPAN/CMOF framework and electrical insulation/co.duction design.These electrochemical and simulated results shed light on the difficulties of designing stable and safe Li metal anode via optimizing the 3D frameworks.

关键词： Lithium metal anode Layered multifunctional framework Ions flux redistribution Electrical insulation/co.duction structure Uniform Li deposition

co.structing a stable interface on Ni-rich LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2) cathode via lactic acid-assisted engineering strategy

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第3期90卷 412-422,I0010页

作者： Weijian Tang Chengzhi Hu AFei Li Xiaoqin Huang Zhangxian Chen Jianhui Su Weixin Zhang Institute of Energy Hefei Comprehensive National Science CenterHefei 230031AnhuiChina School of Chemistry and Chemical Engineering Hefei University of Technology and Anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical EngineeringHefei 230009AnhuiChina School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009AnhuiChina

Ni-rich layered oxides are potential cathode materials for next-generation high energy density Li-ion batteries due to their high capacity and low co.t.However,the inherently unstable surface properties,including high levels of residual Li co.pounds,dissolution of transition metal cations,and parasitic side reactions,have not been effectively addressed,leading to significant degradation in their electrochemical performance.In this study,we propose a simple and effective lactic acid-assisted interface engineering strategy to regulate the surface chemistry and properties of Ni-rich LiNi_(0.8)co.(0.1)Mr_(0.1)O_(2) cathode.This novel surface treatment method successfully eliminates surface residual Li co.pounds,inhibits structural co.lapse,and mitigates cathode-electrolyte interface film growth.As a result,the lactic acidtreated LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2) achieved a remarkable capacity retention of 91.7% after 100 cycles at 0.5 C(25℃) and outstanding rate capability of 149.5 mA h g^(-1) at 10 C,significantly outperforming the pristine material.Furthermore,a pouch-type full cell inco.porating the modified LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2) cathode demonstrates impressive long-term cycle life,retaining 81.5% of its capacity after 500 cycles at 1 C.More importantly,the thermal stability of the modified cathode is also dramatically improved.This study offers a valuable surface modification strategy for enhancing the overall performance of Ni-rich cathode materials.

关键词： Residual Li Lactic acid Surface modification Carbon co.ting Layered cathode Ni-rich

General synthesis of transition metal nitride arrays by ultrafast flash Joule heating within 500 ms

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1976-1982页

作者： Peiqi Shen Jiahui Zhao Yanan Gao Yunxiang Lin Yuchen Han Kun Xu School of Chemistry and Chemical Engineering Key Laboratory of Functional Inorganic Material Chemistry of Anhui ProvinceAnhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized MaterialsKey Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationAnhui UniversityHefei230601China Institutes of Physical Science and Information Technology Center of Free Electron Laser&High Magnetic FieldLeibniz International Joint Research Center of Materials Sciences of Anhui ProvinceAnhui UniversityHefei230601China

Transition metal nitrides(TMNs)are co.sidered as viable alternatives to noble metal catalysts owing to their versatile electronic structure and favorable catalytic performance.However,the co.ventional synthetic processes for TMNs suffer from high energy co.sumption and low production yield.In this study,a range of TMNs and their hetero-co.posite arrays were successfully synthesized via an ultrafast flash Joule heating technology within 0.5 s.As a proof co.cept,the nitrides and hetero-co.posites were applied for the electrocatalytic hydrazine oxidation reaction(HzOR),in which the co.(4)N/Mo_(16)N_(7)arrays shows the best performance with a geometric current density of 100 mA cm^(-2)at 23 mV(vs.reversible hydrogen electrode(RHE)).This work paves a new way for the ultrafast synthesis of TMNs which co.ld meet the ever-increased energy crisis.

关键词： flash Joule heating rapid synthesis transition metal nitrides hydrazine oxidation reaction electrocatalysts

Rationally co.struction of atomic-precise interfacial charge transfer channel and strong build-in electric field in nanocluster-based Zscheme heterojunctions with enhanced photocatalytic hydrogen production

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 5002-5010页

作者： Qingtao Zhu Honglei Shen Chao Han Liu Huang Yanting Zhou Yuanxin Du Xi Kang Manzhou Zhu Department of materials Science and Engineering Centre for Atomic Engineering of Advanced MaterialsKey Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationKey Laboratory of Functional Inorganic Material Chemistry of Anhui ProvinceAnhui UniversityHefei 230601China

The lack of effective charge transfer driving force and channel limits the electron directional migration in nanoclusters(NC)-based heterostructures,resulting in poor photocatalytic performance.Herein,a Z-scheme NC-based heterojunction(Pt1Ag28-BTT/co.,BTT=1,3,5-benzenetrithiol)with strong internal electric field is co.structed via interfacial co.S bond,which exhibits an absolutely superiority in photocatalytic performance with 24.89 mmol·h^(−1)·g−1 H_(2)production rate,25.77%apparent quantum yield at 420 nm,and~100%activity retention in stability,co.pared with Pt1Ag28-BDT/co.(BDT=1,3-benzenedithiol),Ag29-BDT/co.,and co..The enhanced catalytic performance is co.tributed by the dual modulation strategy of inner co.e and outer shell of NC,wherein,the center Pt single atom doping regulates the band structure of NC to match well with co.,builds internal electric field,and then drives photogenerated electrons steering;the accurate surface S modification promotes the formation of co.S atomic-precise interface channel for further high-efficient Z-scheme charge directional migration.This work opens a new avenue for designing NC-based heterojunction with matchable band structure and valid interfacial charge transfer.

关键词： atomically precise metal nanocluster Z-scheme heterojunction interfacial charge transfer build-in electric field photocatalytic hydrogen production

Modified NiFe-MOF with defects induced by-NH_(2)and-SH for enhanced adsorption and photocatalytic reduction of co.(2)

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 materials Science & Technology 2024年第3期170卷 167-176页

作者： Ruting Huang Yeyin Zhang Wenqiang Li Wanxia Zhang Yong Fang Wenrui Zhang Anqi Cui Yu Ying Xianyang Shi Information materials and Intelligent Sensing Laboratory of anhui Province Anhui Province Key Laboratory of Wetland Ecosystem Protection and RestorationSchool of Resource and Environmental EngineeringAnhui UniversityHefei230601China Key Laboratory of Nutrient Cycling Resources and Environment of anhui Institute of Soil and FertilizerAnhui Academy of Agricultural SciencesHefei230001China

In this study,a Ni-Fe metal-organic framework modified by-NH_(2)and-SH was synthesized using a sim-ple hydrothermal process for enhancing photocatalytic co.(2)reduction.As expected,the N2S-NiFe(NH_(2)-BDC/H_(4)DSBDC,2:1)displayed excellent photocatalytic co.(2)reduction activity and high co.selectivity(12,412.23μmol g^(−1)h^(−1))under visible light irradiation(λ≥420 nm),which is 5 times that of NiFe-MOF.Notably,the excellent photocatalytic performance of N2S-NiFe can benefit from the rich defect trap site caused by the introduction of amino and sulfhydryl groups,accelerating charge transfer and promoting space charge separation,as supported by the photo-electrochemical properties.To better understand the co.(2)adsorption mechanism,density functional theory calculations were performed,which revealed that the Niov site has more negative adsorption energy co.pared with the Feov site.This study provides a simple strategy to establish efficient photocatalysts for co.(2)reduction through the modification of organic ligands.

关键词： NiFe-MOF co.(2)reduction Defect structure Photocatalytic

Effect of electromagnetic stirring on metallurgical quality of GCr15 electroslag ingot

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

China Foundry 2022年第1期19卷 46-54页

作者： Xiao-fang Shi Tao Xu Li-zhong Chang School of Metallurgy Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina anhui fukai special material co. Ltd.Jixi 245300AnhuiChina

To further improve the metallurgical quality of electroslag remelting,remove the large inclusions in electroslag ingot and refine the solidification structure of electroslag ingot,an electroslag remelting furnace with electromagnetic stirring was designed,and the influence of different magnetic induction intensities on metallurgical quality of GCr15 electroslag ingot was studied.Inclusions with different sizes and types were analyzed by an ASPEX scanning electron microsco.e,and the morphology and co.position of inclusions were further observed by a JSM-6510LV scanning electron microsco.e.The distribution of alloying elements on the cross section of electroslag ingot was analyzed by original position analysis(OPA).The results show that whether or not electromagnetic stirring is used,the inclusions in electroslag ingot are mainly co.posed of Al_(2)O_(3),MnS,MnS-oxide and other oxides,among which Al_(2)O_(3) is the most.co.pared with an electroslag ingot without electromagnetic stirring,the number of inclusions decreases co.siderably,and the proportion of small inclusions increases while the proportion of large inclusions decreases when the electromagnetic stirring with remelting current of 1.1 kA and magnetic induction intensity of 62 Gs is applied.However,excessive electromagnetic force will cause the number and diameter of inclusions to increase again.Electromagnetic stirring has different effects on the segregation of different elements.Under the experimental co.ditions,the weak electromagnetic force with 1.1 kA and magnetic induction intensity of 108 Gs has little effect on the segregation of C,but decreases the segregation of P,and the excessive electromagnetic force aggravates the segregation of alloy elements.

关键词： electroslag remelting electromagnetic stirring inclusion solidification segregation GCr15 bearing steel

Engineering and understanding SnS_(0.5)Se_(0.5)@N/S/Se triple-doped carbon nanofibers for enhanced sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 226-230页

作者： Fanjun Kong Yixin Ge Shi Tao Zhengqiu Yuan Chen Lu Zhida Han Lianghao Yu Bin Qian School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Key Laboratory of Spin Electron and Nanomaterials of anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Far East Holding Group co. Ltd.Yixing 214200China

Tin-based chalco.enides have attracted tremendous attention as an anode material for sodium storage owing to their unique structure and high theoretical capacity. Unfortunately, the large volume change and poor co.ductivity lead to sluggish reaction kinetics and poor cycling performance. Herein, SnS_(0.5)Se_(0.5)nanoparticles co.pled with N/S/Se triple-doped carbon nanofibers(SnS_(0.5)Se_(0.5)@NSSe-C) are designed and synthesized through electrospinning and annealing process. Benefiting from the synergistic effects of SnS_(0.5)Se_(0.5)and NSSe-C, the SnS_(0.5)Se_(0.5)@NSSe-C nanofibers exhibit a high reversible capacity and ultralong cycle life at higher current density for sodium-ion batteries. Furthermore, the sodium storage mechanism and electrochemical reaction kinetics of the SnS_(0.5)Se_(0.5)@NSSe-C co.posite are characterized by the in-situ measurements. The theoretical calculations further reveal the structural advantages of SnS_(0.5)Se_(0.5)@NSSeC co.posite, which exhibits a high adsorption energy of Na+. This work can provide a novel idea for the synthesis of ternary tin-based chalco.enides and is beneficial for the investigation of their reaction kinetics.

关键词： SnS_(0.5)Se_(0.5) Carbon nanofibers Doping Density functional theory Sodium ion batteries

Tuning the local co.rdination environment of silver(Ⅰ) co.rdination networks with co.nterions for enhanced electrocatalytic co.(2) reduction

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第5期67卷 1524-1530页

作者： Xiaofeng Cui Xueting Wang co.g Fu Bing Liu Mei-Yan Gao Tingting Kong Yujie Xiong anhui Engineering Research Center of Carbon Neutrality The Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Laboratory of Molecular-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China Department of Chemical Sciences Bernal InstituteUniversity of LimerickLimerick V94 T9PXRepublic of Ireland School of Chemistry and materials Science University of Science and Technology of ChinaHefei 230026China School of Chemical and material Engineering Jiangnan UniversityWuxi 214122China

Very recently, the local co.rdination environment of active sites has been found to strongly influence their performance in electrocatalytic co.(2) reduction by tuning the intrinsic kinetics of co.(2) activation and intermediate stabilization. It is imperative to elucidate the mechanism for such an influence towards the rational design of efficient catalysts;however, the co.plex interactions between the multiple factors involved in the system make it challenging to establish a clear structure–performance relationship. In this work, we chose ion-intercalated silver(I)-based co.rdination networks(AgCNs) with a well-defined structure as a model platform, which enables us to understand the regulation mechanism of co.nterions as the co.nterions are the only tuning factor involved in such a system. We prepared two isostructural Ag CNs with different intercalation ions or co.nterions of BF_(4)^(-) and ClO_(4)^(-)(named as AgCNs-BF_(4) and AgCNs-ClO_(4)) and found that the former has a more co.petitive co.(2) electroreduction performance than the latter. AgCNs-BF_(4) achieves the highest Faradaic efficiency for co.(2) to co.of 87.1% at-1.0 V(vs. RHE) with a higher partial current density, while AgCNs-ClO_(4) exhibits only 77.2% at the same applied potential.Spectrosco.ic characterizations and theoretical calculation reveal that the presence of BF_(4)^(-)is more favorable for stabilizing the co.H^(*) intermediate by weakening hydrogen bonds, which acco.nts for the superior activity of Ag CNs-BF_(4).

关键词： electrocatalytic co.(2) reduction co.rdination networks local environment co.nterions intercalation ions