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The effect of various cations/anions for MgH_(2) hydrolysis reaction

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Journal of Materials Science & Technology 2021年第14期73卷 186-192页

作者： Chongyang yuan Wei Chen Zunxian Yang Zhenguo Huang xuebin yu Department of Materials Science Fudan UniversityShanghai200433China National and Local United Engineering Laboratory of Flat Panel Display Technology Fuzhou UniversityFuzhou350002FujianChina School of Civil&Environmental Engineering University of Technology SydneyNew South Wales2007Australia

MgH_(2) is regarded as a potential hydrolysis material for the hydrogen generation due to its high theoretical hydrogen yield,abundant source on earth and environmentally friendly ***,the quickly formed passive magnesium hydroxide layer on the surface of MgH_(2) will hinder its further hydrolysis reaction,leading to sluggish reaction kinetics and low H_(2) *** this paper,we explore the improvement of different anions and cations in solutions for the hydrolysis of MgH_(2).It is found that the cations in the solution promote the reaction rate of MgH_(2) hydrolysis through the hydrolysate-induced growth effect,among which the fastest hydrogen yield can get 1664 m L/g within a few minutes in the Fe_(2)(SO_(4))_(3) *** for the anions,it enables different microstructures of the Mg(OH)_(2) hydrolysate which give rise to enhanced water ***,for the mixed 0.5 M MgCl_(2)+0.05 M MgSO_(4) solution,the water utilization rate attains the optimum value of 51.3%,much higher than that of the single MgCl_(2) or MgSO_(4) *** findings are of great significance for the application of MgH_(2) hydrolysis as hydrogen generation.

关键词： MgH_(2) Hydrolysis reaction Cations Anions Hydrogen generation

Atomic scale understanding of aluminum intercalation into layered TiS2 and its electrochemical properties

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Journal of Energy Chemistry 2020年第4期29卷 116-120页

作者： Shunlong Ju Xiaowei Chen Zunxian Yang Guanglin Xia xuebin yu Department of Materials Science Fudan UniversityShanghai 200433China Department of Physics School of ScienceJimei UniversityXiamen 361021FujianChina National and Local United Engineering Laboratory of Flat Panel Display Technology Fuzhou UniversityFuzhou 350002FujianChina

Aluminum-ion batteries (AIBs) are attracting great attentions recently because of the high volumetric capacity,natural abundance of Al and operational *** metallic A1 as anode,the development of suitable cathode materials is a key issue to build an advanced AIBs system [1,2].Up to now,various materials have been studied as cathode materials for AIBs,including graphite [3,4],metal oxides [5-7],and metal sulfides [8,9].However,few of them can meet the application requirements,and the theoretical understanding of their electrochemical mechanism is limited.

关键词： electrochemical attracting intercalation

Thermodynamics of Fe-P-C in Mn-Based Solutions

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Journal of Iron and Steel Research International 1997年第2期4卷 9-13页

作者： Chen Erbao yu xuebin Dong yuanchi Guo Shangxing East China Institute of Metallurgy University of Science and Technology in Metallurgy

The solubilities of carbon in Mn based alloys containing P have been measured at 1 400 ℃ based on X C=0.271 9-0.094 0 X Fe -1.195 4 X P. By means of thermodynamic derivation and calculation, th... 详细信息

关键词： Mn based Fe P C system activity interaction coefficient thermodynamics

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Synergistic effect of lithiophilic Zn nanoparticles and N-doping for stable Li metal anodes

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Journal of Energy Chemistry 2022年第2期31卷 439-447页

作者： Lei You Shunlong Ju Jianwen Liu Guanglin Xia Zaiping Guo xuebin yu Department of Materials Science Fudan UniversityShanghai 200433China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for Synthesis and Applications of Organic Functional MoleculesCollege of Chemistry and Chemical EngineeringHubei UniversityWuhan 430062HubeiChina School of Chemical Engineering&Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Li metal is the most ideal anode material for next-generation high energy lithium-ion *** uncontrollable growth of Li dendrites,however,hinders its practical ***,we propose the adoption of Zn nanoparticles uniformly embedded in N-doped carbon polyhedra homogeneously built on carbon cloth(Zn@NC@CC)to prevent the formation of Li *** on theoretical calculation and experimental observation,lithiophilic Zn nanoparticles and N-doping inside of the assynthesized Zn@NC play a synergistic role in enhancing the adsorption capacity with Li,thus resulting in uniform Li deposition and complete suppression of Li ***,the porous N-doped carbon polyhedras uniformly distributed on carbon cloth effectively relieves the volume change of Li upon repeated Li stripping/plating process,which contributes to preserving the structural integrity of the whole electrode and hence enhancing its long-term cycling *** from these synergistic effects,the Li-Zn@NC@CC electrode delivers a prolonged lifespan of over 1200 h at 1 mA cm^(-2) with an areal capacity of 1 mA h cm^(-2) in symmetric cells and high Coulombic efficiencies of 95.4%under an ultrahigh capacity of 12 mA h cm^(-2).Remarkably,Li-Zn@NC@CC//LiFePO_(4) full cells deliver a high reversible capacity of 110.2 mA h g^(-1) at 1 C over 200 cycles.

关键词： Li metal anodes Zn nanoparticles N-doping Synergistic effect

Stabilization of low-valence transition metal towards advanced catalytic effects on the hydrogen storage performance of magnesium hydride

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Journal of Magnesium and Alloys 2021年第2期9卷 647-657页

作者： Jian Zhang Shuai Yan Guanglin Xia Xiaojie Zhou Xianzheng Lu Linping yu xuebin yu Ping Peng Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China Department of Materials Science Fudan UniversityShanghai 200433China School of Chemistry and Biological Engineering Changsha University of Science and TechnologyChangsha 410114China College of Materials Science and Engineering Hunan UniversityChangsha 410082China

Magnesium hydride(MgH_(2))has been widely regarded as a potential hydrogen storage material owing to its high gravimetric and volumetric *** sluggish kinetics and high activation energy barrier,however,severely limit its practical *** metal oxides(TMOs)have been extensively used as catalysts to improve the hydrogen storage performance of MgH_(2),but the low-valence transition metal(TM)ions,resulting from the reduction of TMOs accompanied by the formation of inactive Mg O,have been demonstrated to be the most effective ***,we theoretically and experimentally confirm that the doping of low-valence TMs into Mg O could effectively weaken the Mg-H bonds and decrease the energy required for hydrogen desorption from MgH_(2),leading to superior catalytic activity compared to both TMOs and Mg *** particular,the apparent activation energy for the dehydrogenation of Mg(Nb)O-catalyzed MgH_(2)could be reduced to only 84.1 kJ mol^(-1),and the reversible capacity could reach around 7 wt.%after 5 cycles with a capacity retention of 96%.Detailed theoretical calculations confirm that the remarkable orbital hybridization between Mg(Nb)O and MgH_(2)promotes charge transfer from MgO to the MgH_(2)monomer,resulting in significantly weakened stability of MgH_(2),which could effectively enhance its hydrogen storage performance.

关键词： Magnesium hydride Hydrogen storage Dehydrogenation Catalysts First-principles calculations Solid-solution

One-step uniform growth of magnesium hydride nanoparticles on graphene

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Progress in Natural Science:Materials International 2017年第1期27卷 81-87页

作者： yuqin Huang Guanglin Xia Jie Chen Baoping Zhang Qian Li xuebin yu Department of Materials Science Fudan University State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Materials Genome Institute Shanghai University

A simple solvent-free method to synthesize MgH;nanoparticles（MgH;NPs） uniformly grown on graphene nanosheets（GNs） has been reported in this paper. Based on the formation of MgH;by di-n-butylmagnesium(（C;H;）;Mg) thermal decomposition under hydrogen pressure, the GNs were added as matrix to hinder the agglomeration and growing of MgH;NPs. The fabricated MgH;/GNs nanocomposites, in which MgH;NPs were homogenously growing in the graphene matrix, have been synthesized by the favorable adsorption energy between（C;H;）;Mg and GNs. Resulting from the one-step solvent-free route, the generated MgH;NPs shows high hydrogen capacity and steady hydriding and dehydriding properties, without the interference of the synthetic medium. At the same time, the size of the fabricated MgH;NPs can be controlled by adjusting the mass ratio of MgH;to graphene, the various hydrogen pressure and temperature. Attributed to smaller size effect, well uniform distribution of high density MgH;NPs, and the agglomeration blocking ability of graphene,the MgH;/GNs-40 wt% exhibits the favorite hydrogen storage performance.

关键词： Hydrogen storage Magnesium hydride Graphene Nanoparticles Nanocomposite

Small but mighty:Empowering sodium/potassium-ion battery performance with S-doped SnO_(2) quantum dots embedded in N,S codoped carbon fiber network

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Carbon Energy 2024年第5期6卷 186-200页

作者： Shengnan He Hui Wu Shuang Li Ke Liu Yaxiong Yang Hongge Pan xuebin yu Institute of Science and Technology for New Energy Xi'an Technological UniversityXi'anChina Department of Materials Science Fudan UniversityShanghaiChina Wanxiang A123 Systems Corporation HangzhouChina School of Material Science and Engineering Shanghai UniversityShanghaiChina

SnO_(2) has been extensively investigated as an anode material for sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs)due to its high Na/K storage capacity,high abundance,and low ***,the sluggish reaction kinetics,low electronic conductivity,and large volume changes during charge and discharge hinder the practical applications of SnO_(2)-based electrodes for SIBs and *** rational structures with fast charge/ion transfer and robust stability is important to overcoming these ***,S-doped SnO_(2)(S-SnO_(2))quantum dots(QDs)(≈3 nm)encapsulated in an N,S codoped carbon fiber networks(S-SnO_(2)-CFN)are rationally fabricated using a sequential freeze-drying,calcination,and S-doping *** analysis and density functional theory calculations reveal that the integration of S-SnO_(2) QDs with N,S codoped carbon fiber network remarkably decreases the adsorption energies of Na/K atoms in the interlayer of SnO_(2)-CFN,and the S doping can increase the conductivity of SnO_(2),thereby enhancing the ion transfer *** synergistic interaction between S-SnO_(2) QDs and N,S codoped carbon fiber network results in a composite with fast Na+/K+storage and extraordinary long-term ***,the S-SnO_(2)-CFN delivers high rate capacities of 141.0 mAh g^(−1) at 20 A g^(−1) in SIBs and 102.8 mAh g^(−1) at 10 A g^(−1) in ***,it delivers ultra-stable sodium storage up to 10,000 cycles at 5 A g^(−1) and potassium storage up to 5000 cycles at 2 A g^(−1).This study provides insights into constructing metal oxide-based carbon fiber network structures for high-performance electrochemical energy storage and conversion devices.

关键词： carbon fiber network heteroatom doping potassium-ion battery sodium-ion battery S-SnO_(2)quantum dot

MoS_(2)/MoO_(2) nanosheets anchored on carbon cloth for high-performance magnesium-and sodium-ion storage

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Journal of Materials Science & Technology 2023年第12期143卷 43-53页

作者： Hui Wu Zhennan Xiong Yiyang Mao Huihui Zhang Yingying Hu Jun Shen Baofeng Wang xuebin yu Department of Materials Science Fudan UniversityShanghai 200433China Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric PowerShanghai 200090China

Developing new types of rechargeable metal-ion batteries beyond lithium-ions,including alkaline ion(such as Na+,K+)and multivalent ion(such as Mg 2+,Zn 2+,Ca 2+and Al 3+)batteries,is progressing quickly towards large-scale energy storage ***,the major obstacle to their large-scale applications has been a lack of appropriate electrode materials with reversible metal ions insertion/extraction be-havior,resulting in inferior electrochemical *** we develop a well-designed MoS_(2)/MoO_(2) hybrid nanosheets anchored on carbon cloth(MoS_(2)/MoO_(2)/CC)as electrode *** rational de-sign can effectively shorten ion diffusion distance,increase electric conductivity of the electrode,and buffer volume *** from the synergistic effect of structural and compositional features,the MoS_(2)/MoO_(2)/CC electrode exhibits high initial reversible capacities(326 mA h g^(−1) at 0.1 A g^(−1) in magnesium-ion storage;1270 mA h g^(−1) at 0.1 A g^(−1) in sodium-ion storage),excellent rate capacities(57 mA h g^(−1) at 10 A g^(−1) in magnesium-ion storage;335 mA h g^(−1) at 5 A g^(−1) in sodium-ion storage)and long-term cycling stability(105 mA h g^(−1) after 600 cycle at 1 A g^(−1) in magnesium-ion storage;208 mA h g^(−1) after 600 cycles at 5 A g^(−1) in sodium-ion storage).We expect that the multi-engineering strategy will provide some valuable insights for the development of other advanced electrode materials for high-performance metal-ion batteries.

关键词： Metal-ion batteries MoS_(2)/MoO_(2)/CC Magnesium and sodium storage High reversibility

TiO_(2)@C catalyzed hydrogen storage performance of Mg-Ni-Y alloy with LPSO and ternary eutectic structure

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Journal of Magnesium and Alloys 2024年第2期12卷 767-778页

作者： Wenjie Song Wenhao Ma Shuai He Wei Chen Jianghua Shen Dalin Sun Qiuming Wei xuebin yu College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’anShaanxi 710021China Department of Materials Science Fudan UniversityShanghai 200438China School of Aeronautics Northwestern Polytechnical UniversityXi’anShaanxi 710072China Department of Mechanical Engineering&Engineering Science the University of North Carolina at CharlotteCharlotteNorth Carolina 28223United States of America

A designed Mg_(88.7)Ni_(6.3)Y_(5)hydrogen storage alloy containing 14H type LPSO(long-period stacking ordered)and ternary eutectic structure was prepared by regulating the alloy composition and *** hydrogen storage performance of the alloy was improved by adding nano-flower-like TiO_(2)@C *** decomposition of the LPSO structure during hydrogenation led to the formation of plenty of nanocrystals which provided abundant interphase boundaries and activation *** nanoscale TiO_(2)@C catalyst was uniformly dispersed on the surface of alloy particles,and the"hydrogen overflow''effect of TiO_(2)@C accelerated the dissociation and diffusion of hydrogen on the surface of the alloy *** a result,the in-situ endogenous nanocrystals of the LPSO structure decomposition and the externally added flower-like TiO_(2)@C catalyst uniformly dispersed on the surface of the nanoparticles played a synergistic catalytic role in improving the hydrogen storage performance of the Mg-based *** the addition of the TiO_(2)@C catalyst,the beginning hydrogen desorption temperature was reduced to 200℃.Furthermore,the saturated hydrogen absorption capacity of the sample was 5.32 wt.%,and it reached 4.25 wt.%H_(2) in 1 min at 200℃and 30 bar.

关键词： Hydrogen storage Mg LPSO TiO_(2)@C Synergistic catalysis