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Improvement on hydrogen generation properties of zr(Bh4)4·8Nh3

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Progress in Natural Science:Materials International 2021年第1期31卷 41-46页

作者： D.F.Wu l.z.Ouyang j.M.huang j.W.liu h.Wang X.S.Yang h.Shao M.zhu School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials South China University of Technology guangdong Research Institute of Rare Metals Guangdong Key Laboratory of Rare Earth Development and Application China-Australia joint laboratory for Energy & Environmental Materials Key Laboratory of Fuel Cell Technology of Guangdong Province Advanced Manufacturing Technology Research Centre Department of Industrial and Systems Engineering The Hong Kong Polytechnic University joint Key laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering (IAPME) University of Macau

hydrolysis of zr(Bh4)4·8Nh3in deionized water can generate high purity hydrogen at room ***, the sluggish hydrolysis kinetics of zr(Bh4)4·8Nh3hinders its practical use. To improve its hydrogen generation properties, the effects of magnetic stirring, changing hydrolysis solution and tuning the ammonia coordination number on the hydrolysis properties of zr(Bh4)4·8Nh3were investigated. Results show that both changing hydrolysis solution and tuning the ammonia coordination number can enhance the hydrolysis *** hydrolysis kinetics properties of zr(Bh4)4·8Nh3were significantly improved in MgCl2and *** zr(Bh4)4·8Nh3(x ≤ 8) samples were synthesized by a ball-milling method with different ammonization time(10, 60 and 180 min). Both the hydrolysis kinetics and hydrogen yield of zr(Bh4)4·8Nh3(x ≤ 8) were enhanced as the ammonia coordination number(x) decreased. Thus, tuning ammonia coordination number is an effective way to control the hydrolysis properties of zr(Bh4)4·8Nh3(x ≤ 8).

关键词： hydrogen production zr(Bh4)4·8Nh3 hydrolysis properties Ammonia coordination number

Reactive destabilization and bidirectional catalyzation for reversible hydrogen storage of liBh_(4) by novel waxberry-like nano-additive assembled from ultrafine Fe_(3)O_(4) particles

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journal of Materials Science & Technology 2024年第6期173卷 63-71页

作者： S.Wang M.h.Wu Y.Y.zhu z.l.li Y.X.Yang Y.z.l. h.F.liu M.X.Gao Department of Material Science Shenzhen MSU-BIT UniversityShenzhen 518172China State Key laboratory of Silicon and Advanced Semiconductor Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Resources Utilization and Rare Earth Development State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China Institute of Science and Technology for New Energy Xi’an Technological UniversityXi’an 710021China National Supercomputing Center in Shenzhen Shenzhen 518055China

liBh_(4) containing 18.5 wt.%h_(2) is an attractive high-capacity hydrogen storage material,however,it suffers from high operation temperature and poor ***,a novel and low-cost bifunctional additive,waxberry-like Fe_(3)O_(4) secondary nanospheres assembled from ultrafine primary Fe_(3)O_(4) nanoparticles,is synthesized,which exhibits significant destabilization and bidirectional catalyzation towards(de)hydrogenation of liBh_(4).With an optimized addition of 30 wt.% waxberry-like Fe_(3)O_(4),the system initiated dehydrogenation below 100℃ and released a total of 8.1 wt.%h_(2) to 400℃.After 10 cycles,a capacity retention of 70% was achieved,greatly superior to previously reported oxides-modified *** destabilizing and catalyzing mechanisms of waxberry-like Fe_(3)O_(4) on liBh_(4) were systematically analyzed by phase and microstructural evolutions during dehydrogenation and hydrogenation cycling as well as density functional theory(DFT)*** present work provides new insights in developing advanced nano-additives with unique structural and multifunctional designs towards liBh4 hydrogen storage.

关键词： liBh_(4) hydrogen storage Waxberry-like Fe_(3)O_(4) Destabilization Catalysis

Distribution of Be in a Ti-Based Bulk Metallic Glass Composite Containing B-Ti

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journal of Materials Science & Technology 2017年第7期33卷 708-711页

作者： l.zhang W.Q.li z.W.zhu h.M.Fu h.li z.K.li h.W.zhang A.M.Wang h.F.zhang Shenyang National laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 110016 Shenyang China

In order to obtain a glassy matrix during quenching, Be is often selected as a constituent of the compositions of Ti/zr-based bulk metallic glass composites（BMGCs）. The in situ formed β phase in Be-bearing BMGCs was reported to be Be-free. however, a thorough investigation of the distribution of Be in BMGCs is still missing to date. In this work, the distribution of Be in a Ti_（47.5）zr_（33）Cu_（5.8）Co_3Be_（12.5）（at.%） BMGC was studied by the secondary ion mass spectrometry（SIMS） and the electron energy loss spectroscopy（EElS）.It is found that Be almost totally dissolves in the glassy matrix, but a very weak intensity of Be in β phase is still detectable by SIMS, and the content of Be in β-Ti is estimated to be about 0.3 at.%. Based on the recently established two-phase quasi-equilibrium of BMGCs, the distinct solubility of Be in the glassy matrix and in β-Ti has been explained.

关键词： Bulk metallic glass(BMG) Metallic glass composite Beryllium Quasi-equilibrium

Synergistic O^(2-)/li^(+) Dual Ion Transportation at Atomic Scale

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Research 2019年第1期2019卷 1260-1267页

作者： F.Q.Meng Q.h.zhang A.Gao X.z.l.u j.N.zhang S.Y.Peng X.lu l.gu h.li Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Materials Sun Yat-Sen UniversityGuangzhou 510275China College of Materials Science and Engineering Jiangxi University of Science and TechnologyJiangxi 341000China Songshan lake Materials laboratory DongguanGuangdong 523808China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Te ion migration during electrochemical process is a fundamental scientifc issue for phase transition behavior and of technical importance for various functional devices,where cations or anions are active under electrical *** only one type of functional ion,O^(2-)or li^(+),is activated due to their diferent migration energy barriers,cooperated by the valence change of other immobile ions in the host lattice matrix,e.g.,Co^(2+)/Co^(3+)and Mn^(3+)/Mn4+redox couples,owing to the charge *** we select spinel li4Ti5O12 as anode and construct an all-solid-state battery under a transmission electron microscope;a synergistic transportation of O^(2-)and li^(+)driven by an electrical bias was directly observed at the atomic scale.A small amount of oxygen anions was extracted frstly as a result of its lowest vacancy formation energy under 2.2 V,leading to the vertical displacement of *** to 2.7 V,an ordered phase with both li-and O-defciency *** li^(+)and O^(2-)ions are simultaneously extracted out from the[liO_(4)]tetrahedra due to the electroneutrality *** migration paths of O and li have been proposed and verifed by frst-principles *** results reveal a brand new synergistic ion migration manner and may provide up-to-date insights on the transportation process of lithium ion conductors.

关键词： synergistic battery migration

Current diffusion and efficiency droop in vertical light emitting diodes

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Chinese Physics B 2019年第1期28卷 561-569页

作者： R Q Wan T li z Q liu X Y Yi j X Wang j.h.li W h zhu j M li l C Wang State Key laboratory of high Performance Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South University Semiconductor lighting Technology Research and Development Center Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences

Current diffusion is an old issue, nevertheless, the relationship between the current diffusion and the efficiency of light emitting diodes(lEDs) needs to be further quantitatively clarified. By incorporating current crowding effect(CCE) into the conventional ABC model, we have theoretically and directly correlated the current diffusion and the internal quantum efficiency(IQE), light extraction efficiency(lEE), and external quantum efficiency(EQE) droop of the lateral ***, questions still exist for the vertical lEDs(V-lEDs). here firstly the current diffusion length l_s(I) and l_s(II) have been clarified. Based on this, the influence of CCE on the EQE, IQE, and lEE of V-lEDs were investigated. Specifically to our V-lEDs with moderate series resistivity, l_s(III) was developed by combining l_s(I) and l_s(II), and the CCE effect on the performance of V-lEDs was investigated. The wall-plug efficiency(WPE) of V-lEDs ware investigated finally. Our works provide a deep understanding of the current diffusion status and the correlated efficiency droop in V-lEDs, thus would benefit the V-lEDs' chip design and further efficiency improvement.

关键词： efficiency droop vertical light emitting diodes current crowding effect current blocking layer

Phased Array Feed Experiments and Galactic hI Observations

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Research in Astronomy and Astrophysics 2023年第8期23卷 297-307页

作者： B.liu h.W.Xi D.j.Ding z.W.Wang S.h.Yu Y.zhu l.Yu X.zhang j.l.li l.j.liu Q.Su Y.Wu C.j.jin B.Peng National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Key laboratory of Radio Astronomy and Technology Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China The 54th Research Institute of China Electronic Technology Group Cooperation Shijiazhuang 050081China

The Phased Array Feed(PAF)is considered as one of the next generation receivers for radio telescopes,which can significantly enlarge the instantaneous Field-of-View of large aperture single dish radio telescopes and enable more flexible observing *** efforts on PAF development for radio telescopes have been made for more than two decades and have become more and more *** report the development of an ambient-temperature 19 element l-band PAF system and the experimental results including its far field beam pattern and system temperature measurement,which achieve the *** the aperture array beam-forming method,we demonstrate a wide-field Galactic hI observations in the radio camera *** results indicate that this system might be applicable for strong Galactic transient *** system could be directly equipped to large telescopes like the Five-hundred-meter Aperture Spherical radio Telescope(FAST)and FAST array in the future.

关键词： instrumentation detectors-techniques imaging spectroscopy-line profiles

TiS2-based saturable absorber for ultrafast fiber lasers

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Photonics Research 2018年第10期6卷 I0046-I0050页

作者： X. zhu S. ChEN M. zhANG l. ChEN Q. Wu j. zhAO Q．jIANG z．zhENG h．zhANG School of Electronic and Information Engineering Beihang University Beijing 100191 China Department of Optoelectronics Engineering Shenzhen University Shenzhen 518060 China College of health Science and Environmental Engineering Shenzhen Technology University Shenzhen 518118 China College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

We fabricate titanium disulfide(TiS2) using a liquid exfoliation method and subsequently a TiS2-based device by optically depositing the TiS2 material onto the microfiber. This device exhibits a strong nonlinear saturable absorption property with an optical modulation depth of 8.3% at 1560 nm. With the implementation of this all-fiber TiS2-based saturable absorber, we demonstrate that both mode-locking and Q-switching operation can be obtained in a turn-key all-fiber erbium-doped laser cavity. Our findings constitute the first example, to the best of our knowledge, of a TiS2-based saturable absorber for ultrashort pulse generation and highlight the great potential of such devices in two-dimensional nanomaterials-related photonics.

关键词：液体剥离方法激光器通讯技术发展现状

EFFECTS OF TREATMENT TIME ON CORROSION OF DIFFUSION-AllOYED COATINGS OF PURE MAGNESIUM

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Acta Metallurgica Sinica(English letters) 2007年第1期20卷 72-78页

作者： Y.P. Ma j. li j. zhu l. Yang Y.G. liu z.Y. li F. zhao School of Metallurgic Engineering Xi＇an University of Architecture ＆ Technology Xi＇an 710055 China

The corrosion resistance of pure magnesium with surface alloying layer obtained by a solid diffusion alloying technique has been analyzed. To establish the optimum treatment time, the experiments were performed at 480℃ for different solid diffusion time （8, 16, and 24h）. The diffusion interaction effectiveness between zn, Al mix powder and the sample surface, depending on the treatment time for diffusion at given temperatures, has an obvious influence on corrosion resistance and corrosion mechanism. Corrosion properties were studied using the constant immersion test （in 3.0% NaCl solution, temperature is （28±1）℃, and time is 96h）. Optical microscopy （OM） and EDS （energy dispersive spectrum） composition analysis were used to examine the cross-sectional microstructural characteristics of alloyed layer of treated samples. It is shown that in comparison with the untreated samples, the treated ones possess a better corrosion resistance. The Al5Mg11zn4 phase, which formed as a continuous phase due to the diffusion of Al, zn, and Mg elements and subsequent interaction on the outermost layer of diffusion alloying zones （especially the samples treated for 24h at 480℃）, was inert to the chloride solution compared with pure magnesium and acted as a corrosion barrier, and therefore the best corrosion resistance was obtained. This protective action of Al5Mg11zn4 phase was found to change with its amount, which was controlled by the diffusion time at given temperature. It was concluded that the continuous Al5Mg11zn4 phase （WP-zone） of the reacted layer in pure magnesium was beneficial from the point of view of corrosion resistance.

关键词： pure magnesium solid diffusion treatment time microstructure corrosion

Synthesis and Characterization of Tb-incorporated Apatite Nano-scale Powders

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journal of Materials Science & Technology 2012年第9期28卷 773-778页

作者： l.j. Sun P.F. Ni D.G. guo C.Q. Fang j. Wang F. Yang X.F. huang Y.z. hao h. zhu K.W. Xu State Key laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China School of Printing and Packaging Engineering Xi'an University of Technology Xi'an 710048 China Xi'an University of Arts and Science Xi'an 710065 China

Nano-scale Tb-incorporated apatite （nano-Tb-AP） particles with different Tb contents （Tb/（Tb＋Ca）） of 0%, 5%, 10% and 20% were synthesized through a simple wet chemical method in this study. The crystal structure, thermal stabilities, chemical groups, crystal morphologies and crystal sizes of the nano--Tb-AP particles were characterized by X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, and transmission electron microscopy （TEM）, respectively. It was found that lattice constants, particle sizes, crystalline and thermal stability varied with the doped Tb contents. With the increasing of Tb content, the lattice constants, particle size, length/diameter ratio, crystalline and thermal stability of nano-Tb-AP gradually decrease. Especially, almost all the 20%Tb-AP nano particles had been decomposed at 1200 ℃ while only a few of the decomposed products （β-TCP） were detected in the Tb-free nano apatite powders： This kind of nano-scale Tb-incorporated apatite exhibits an extremely potential clinic application because it integrates both the excellent biological functions of Tb element and apatite in human body.

关键词： Nano-scale powder Terbium (Tb) Wet chemical approach Apatite Biomedical materials