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Study on the hydrogen storage property of(TiZr0.1)xCr1.7-yFeyMn0.3(1.05 ＜ x ＜ 1.2, 0.2 ＜ y ＜ 0.6) alloys

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Progress in Natural Science:Materials International 2018年第4期28卷 470-477页

作者： Jigang li li Xu Xiaojing Jiang xingguo li College of Chemistry and Molecular Engineering Peking University Material Laboratory of State Grid Corporation of China State Key laboratory of Advanced Transmission Technology Global Energy Interconnection Research InstituteState Grid Corporation of China

The hydrogen storage of(TiZr0.1)xCr1.7-yFeyMn0.3(1.05 详细信息

The hydrogen storage of(TiZr0.1)xCr1.7-yFeyMn0.3(1.05line was not obvious when the(TiZr)super-stoichiometry exceeded ***(TiZr0.1)1.1Cr1.1Fe0.6Mn0.3alloy had the best comprehensive properties about the maximum and reversible hydrogen storage capacity was 1.79 and 1.45 wt%*** cell parameters a,c and unit cell volume of(TiZr0.1)1.1Cr1.7-yFeyMn0.3(0.2≤y≤0.6)alloys increased as the ratio of Fe/Cr content *** hydrogenation and dehydrogenation plateau pressure decreased from 4.5,3.4–1.0,0.9 MPa respectively and the maximum hydrogen storage capacity increased from 1.79 to 2.0 wt%as the Fe content reduced from 0.6 to 0.2 at274 *** maximum and the reversible hydrogen storage capacity were about 2.0 and 1.65 wt%as the ratio of Fe/Cr was 0.13(ie,(TiZr0.1)1.1Cr1.5Fe0.2Mn0.3alloy),its relative molar enthalpy of dissociation hydrogen was24.30 kJ/mol H2.

关键词： Hydrogen storage alloy Ti-Cr type Laves phase PCT Plasma arc melting

A review of rare-earth oxide films as high k dielectrics in MOS devices——Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

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Journal of Rare Earths 2021年第2期39卷 121-128页

作者： Shuan li Youyu lin Siyao Tang lili Feng xingguo li Beijing National Lnboratory of Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School of Chemical&Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Recently,rare-earth oxide films have attracted more and more attention as gate dielectrics in metaloxide-semiconductor(MOS)devices,showing the advantages of high dielectric constant(k value),large band gap(Eg)and outstanding physical and chemical stability in contact with silicon *** paper reviews the recent development of rare earth oxide-based gate dielectric *** at the problem that k value of rare earth oxides(REOs)is generally inversely proportio nal to the band gap value,one of the biggest technical obstacles of high k films,we reviewed three strategies reported in recent papers,namely doping modification,nitriding treatment and multilayer composite,which can provide some insights for long-term development of MOS devices in integrated circuit(IC).

关键词： Rare earth Thin film Oxides High k dielectric Metal-oxide-semiconductor

Significantly improved high k dielectric performance:Rare earth oxide as a passivation layer laminated with TiO_(2) film

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Journal of Rare Earths 2023年第9期41卷 1376-1384,I0004页

作者： Shuan li Weipeng Wang Youyu lin linlin Wang xingguo li Beijing National Laboratory of Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory of Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

In order to achieve a super gate dielectric performance,rare earth oxides featuring for large band gap,good thermodynamic stability and relatively high k value were selected to be laminated with TiO_(2)film to prepare bilayer dielectric *** an example,the microstructure,morphology,band gap structure and electrical performance of TiO_(2)-Y_(2)O_(3)bilayer films were systematically *** show that stacking sequence of TiO_(2)and Y_(2)O_(3)sublayers has a significant impact on the dielectric performance and Y_(2)O_(3)film as a passivation layer can effectively improve electrical ***,the electrical behaviors analysis of TiO_(2)-Y_(2)O_(3),Y_(2)O_(3)-TiO_(2),Y_(2)O_(3)and TiO_(2)samples was carried out by impedance spectra and equivale nt *** result shows that TiO_(2)-Y_(2)O_(3)/Si sample holds the largest internal re sistance of 74665Ωamong four ***,the most outstanding properties of Pt/TiO_(2)-Y_(2)O_(3)/Si capacitor are achieved by varying the thickness of sublayers and annealing temperature.500℃-annealed bilayer film with 17 nm-TiO_(2)and 3-nm Y_(2)O_(3)displays a k value of 28.24,which is more than 1.4 times that of current commercial HfO_(2).Further,Schottky emission was determined to be leakage current transport mechanism for TiO_(2)-Y_(2)O_(3)bilayer *** by this result,the electrical performance of more general Pt/TiO_(2)-REOs/Si MOS capacitors(RE=Sc,La,Ce,Gd and Pr)was *** combination of TiO_(2)film and REOs passivation layer with the satisfying performance provides promising candidates for future Si-based integrated circuit(IC).

关键词： Rare earth oxides Gate dielectric Thin film Sputtering Passivation layer

Hydrogen storage properties of(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1M0.1(M=Ni,Fe,Cu) alloys easily activated at room temperature

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Progress in Natural Science:Materials International 2017年第6期27卷 652-657页

作者： Peng liu Xiubo Xie li Xu xingguo li Tong liu Key Laboratory of Aerospace Materials and Performance (Ministry of Education) School of Materials Science and Engineering Beihang University State Grid Smart Grid Research Institute Future Science and Technology City Changping 3. Beijing National Laboratory for Molecular Sciences (BNLMS) The State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University

The(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1M0.1(M=Ni, Fe, Cu) alloys with a single C14-type Laves phase have been fabricated by arc melting. They are able to be easily activated by one hydrogen absorption and desorption cycle under 4 MPa hydrogen pressure and vacuum at room temperature. Partial substitution of M for Mn results in the increase of hydrogenation and dehydrogenation capacities in an order of Ni < Fe < Cu. M elements increase the absorption and desorption plateau pressure in an order of(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Cu0.1<(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Fe0.1<(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Ni0.1. The(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Cu0.1alloy has reversible hydrogen capacities of 1.81 wt% at 273 K and 1.58 wt% at 318 K with formation enthalpy(ΔHab) of-20.66 kJ mol-1and decomposition enthalpy(ΔHde) of 27.37 kJ mol-1. The differences in the hydrogen storage properties can be attributed to the increase of the interstitial size for hydrogen accommodation caused by the increase of unit cell volumes in the order of(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Ni0.1<(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Fe0.1<(Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Cu0.1.

关键词： Titanium-manganese based alloy Laves phase Unit cell volume Activation properties Hydrogen storage properties

Synthesis and dehydrogenation properties of NaZn(BH4)3·en and NaZn(BH4)3·2en(en= ethylene diamine)

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Journal of Energy Chemistry 2020年第3期29卷 233-236页

作者： Yong Wu Yue Qi Jie Zheng xingguo li Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Two new hydrogen storage compounds,Na Zn(BH4)3·en and Na Zn(BH4)3·2en(en=ethylene diamine)are synthesized by a solution *** can release 6.4 wt%and 6.3 wt%pure hydrogen below 200℃,respectively,demonstrating the potential to be used as hydrogen ***,their dehydrogenation products,thermodynamics and kinetics are well characterized and *** shows that the stronger Zn-N interactions and the Hδ+–Hδ-interactions are significant for their stability below 100℃,relatively low decomposition temperatures and elimination of gas impurities.

关键词： Borohydride Ethylene diamine Hydrogen storage

Hydrogen generation from NaBH_(4) for portable proton exchange membrane fuel cell

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Materials Reports(Energy) 2024年第1期4卷 69-78页

作者： Bingxue Sun xingguo li Jie Zheng Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871PR China

Sodium borohydride(NaBH_(4)) is considered as the most potential hydrogen storage material for portable proton exchange membrane fuel cells(PEMFC)because of its high theoretical hydrogen ***,the slow and poor kinetic stability of hydrogen generation from NaBH_(4) hydrolysis limits its *** are two main factors influencing the kinetics stability of hydrogen generation from NaBH_(4).One factor is that the alkaline byproducts(NaBO_(2)) of the hydrolysis reaction can increase the pH of the solution,thus inhibiting the reaction *** mainly happens in the NaBH_(4) solution hydrolysis *** factor is that the monotonous increase in reaction temperature leads to uncontrollable and unpredictable hydrolysis rates in the solid NaBH_(4) hydrolysis *** is due to the excess heat generated from this exothermic reaction in the initial reaction of NaBH_(4) *** this perspective,we summarize the latest research progress in hydrogen generation from NaBH_(4) and emphasize the design principles of catalysts for hydrogen generation from NaBH_(4) solution and solid state NaBH_(4).The importance of carbon as catalyst support material for NaBH_(4) hydrolysis is also highlighted.

关键词： NaBH_(4)hydrolysis Hydrogen generation Catalyst Kinetics Carbon support materials

Modeling and analysis of ground target radiation cross section

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Chinese Science Bulletin 2008年第9期53卷 1444-1449页

作者： SHI Xiang LOU GuoWei li xingguo Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai 200050 China Research Institute of MMW and light Wave Near-sensing Technology Nanjing University of Science and Technology Nanjing 210094 China

Based on the analysis of the passive millimeter wave (MMW) radiometer detection, the ground target radiation cross section is modeled as the new token for the target MMW radiant characteristics. Its ap- plication and actual testing are discussed and analyzed. The essence of passive MMW stealth is target radiation cross section reduction.

关键词：微波模型模拟辐射交叉断面辐射计

Perspectives and challenges of hydrogen storage in solid-state hydrides

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Chinese Journal of Chemical Engineering 2021年第1期34卷 1-12页

作者： Zhen Chen Zhongliang Ma Jie Zheng xingguo li Etsuo Akiba Hai-Wen li International Research Center for Hydrogen Energy Kyushu University744 Motooka Nishi-kuFukuoka 819-0395Japan School of Chemistry and Chemical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211816China Beijing National Laboratory for Molecular Science College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China International Institute for Carbon-Neutral Energy Research Kyushu University744 Motooka Nishi-kuFukuoka 819-0395Japan Platform of Inter/Transdisciplinary Energy Research Kyushu University744 Motooka Nishi-kuFukuoka 819-0395Japan

Hydrogen has been widely considered as a clean energy carrier that bridges the energy producers and energy consumers in an efficient and safe way for a sustainable *** can be stored in a gas,liquid and solid states and each method has its unique *** compressed hydrogen and liquefied hydrogen are mature technologies for industrial applications,appropriate measures are necessary to deal with the issues at high pressure up to around 100 MPa and low temperature at around 20 *** from those technologies,storing hydrogen in solid-state hydrides can realize a more compact and much safer approach that does not require high hydrogen pressure and cryogenic *** this review,we will provide an overview of the majormaterial groups that are capable of absorbing and desorbing hydrogen *** main features on hydrogen storage properties of each material group are summarized,together with the discussion of the key issues and the guidance of materials design,aiming at providing insights for new material development as well as industrial applications.

关键词： Hydrogen Hydrogen storage Hydride Hydrogen energy Renewable energy Environment

Plasma-processed homogeneous magnesium hydride/ carbon nanocomposites for highly stable lithium storage

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Nano Research 2018年第5期11卷 2724-2732页

作者： Xinghua Chang Xinyao Zheng Yanru Guo Jun Chen Jie Zheng xingguo li Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Academy for Advanced and Interdisciplinary Studies Peking University Beijing 100871 China

Magnesium hydride （MgH2） is a high-capacity anode material for lithium ion batteries, which suffers from poor cycling stability. In this stud）~ we describe a thermal plasma-based approach to prepare homogeneous MgH2/C nanocomposites with very high cycling stability. In this process, magnesium evaporation is coupled with carbon generation from the plasma decomposition of acetylene, leading to a homogeneous Mg/C nanocomposite, which can be easily converted to MgH2/C by hydrogenation. The MgH2/C nanocomposite achieves a high reversible capacity of up to 620 mAh·g^-1 after 1,000 cycles with an ultralow decay rate of only 0.0036% per cycle, which represents a significantly improved performance compared to previous results.

关键词： magnesium hydride anode lithium-ion batteries thermal plasma nanocomposite