检索结果-内蒙古大学图书馆

Zr_(2)SeB and Hf_(2)SeB:Two new MAB phase compounds with the Cr_(2)AlC-type MAX phase(211 phase)crystal structures

Journal of advanced Ceramics 2022年第11期11卷 1764-1776页

作者： Qiqiang ZHANG Yanchun ZHOU Xingyuan SAN Wenbo LI Yiwang BAO Qingguo FENG Salvatore GRASSO Chunfeng HU Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Hebei Key Lab of Optic–Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 100024China

The ternary or quaternary layered compounds called MAB phases are frequently mentioned recently together with the well-known MAX ***,MAB phases are generally referred to layered transition metal borides,while MAX phases are layered transition metal carbides and nitrides with different types of crystal structure although they share the common nano-laminated structure *** order to prove that MAB phases can share the same type of crystal structure with MAX phases and extend the composition window of MAX phases from carbides and nitrides to borides,two new MAB phase compounds Zr_(2)SeB and Hf_(2)SeB with the Cr_(2)AlC-type MAX phase(211 phase)crystal structure were discovered by a combination of first-principles calculations and experimental verification in this ***-principles calculations predicted the stability and lattice parameters of the two new MAB phase compounds Zr_(2)SeB and Hf_(2)*** they were successfully synthesized by using a thermal explosion method in a spark plasma sintering(SPS)*** crystal structures of Zr_(2)SeB and Hf_(2)SeB were determined by a combination of the X-ray diffraction(XRD),scanning electron microscopy(SEM),and high-resolution transmission electron microscopy(HRTEM).The lattice parameters of Zr_(2)SeB and Hf_(2)SeB are a=3.64398Å,c=12.63223Åand a=3.52280Å,c=12.47804Å,*** the atomic positions are M at 4f(1/3,2/3,0.60288[Zr]or 0.59889[Hf]),Se at 2c(1/3,2/3,1/4),and B at 2a(0,0,0).And the atomic stacking sequences follow those of the Cr_(2)AlC-type MAX *** work opens up the composition window for the MAB phases and MAX phases and will trigger the interests of material scientists and physicists to explore new compounds and properties in this new family of materials.

关键词： Zr_(2)SeB and Hf_(2)SeB MAB phase MAX phase first-principles calculations thermal explosion synthesis

来源：评论

学校读者我要写书评

暂无评论

Stable operation of polymer electrolyte-solid-state batteries via lonepair electron fillers

引用

Nano Research 2023年第11期16卷 12727-12737页

作者： Hongbin Liu Qing Sun Jun Cheng Hongqiang Zhang Xiao Xu Yuanyuan Li Zhen Zeng Yue Zhao Deping Li Jingyu Lu Lijie Ci State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Research Center for Carbon Nanomaterials Key Laboratory for Liquid–Solid Structural Evolution&Processing of Materials(Ministry of Education)School of Materials Science and EngineeringShandong UniversityJinan 250061China College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China

Due to the increasing demand and wide applications of lithium-ion batteries,higher requirements have been placed on the energy density and *** solid-state electrolytes have gained significant popularity due to their excellent interface compatibility and ***,their applications have been greatly restricted by the high crystallinity at room temperature,which hinders the transport of lithium ***,we utilize inorganic tubular fillers with abundant lone-pair atoms to reduce the crystallinity of the polyethylene oxide(PEO)solid-state electrolyte membrane and improve its ionic conductivity at room temperature,enabling stable operation of the *** tubular lone-pair-rich inorganic fillers play a key role in providing avenues for both internal and external charge *** surface lone-pair electrons facilitate the dissociation and transport of lithium ions,while the internally tubular electron-rich layer attracts ions into the cavities,further enhancing the ion *** 100 cycles at room temperature,the lithium battery loaded with this solid-state electrolyte membrane delivers a specific capacity of 141.6 mAh·g−1,which is 51.3%higher compared to the membrane without the fillers.

关键词： nanotube filler polymer electrolyte ion transport room temperature(RT)operation

来源：评论

学校读者我要写书评

暂无评论

Insight the long-term biodegradable Mg-RE-Sr alloy for orthopaedics implant via friction stir processing

引用

Bioactive materials 2024年第11期41卷 293-311页

作者： Yixing Zhu Mengran Zhou Weikang Zhao Yingxin Geng Yujie Chen Han Tian Yifan Zhou Gaoqiang Chen Ruizhi Wu Yufeng Zheng Qingyu Shi State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084PR China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing100084PR China Department of Orthopedics The First Affiliated Hospital of Chongqing Medical UniversityChongqing400016PR China Key Laboratory of Superlight Materials&Surface Technology(Ministry of Education) Harbin Engineering UniversityHarbin150001PR China School of Materials Science and Engineering Peking UniversityBeijing100871PR China

Magnesium alloys,noted for their substantial mechanical strength and exceptional biocompatibility,are increasingly being considered for use in biodegradable ***,their rapid degradation and significant hydrogen release have limited their applications in *** this study,a novel Mg-RE-Sr alloy was created by friction stir processing to modify its microstructure and enhance its degradation *** microstructural characterization,the friction stir processing effectively refined the grains,accelerated the re-dissolution of precipitates,and ensured a uniform distribution of these *** processed alloy demonstrated improved comprehensive properties,with an in vitro corrosion rate of approximately 0.4 mm/y and increases in ultimate tensile strength and elongation by 37%and 166%,***,in vivo experiments involving a rat subcutaneous implantation model revealed a slower degradation rate of 0.09 mm/y and a uniform degradation process,basically achieving the requirements for ideal performance in orthopaedic *** superior degradation characteristics were attributed to the synergistic effect of attenuated galvanic corrosion and the formation of a dense Y(OH)3/Y2O3 film induced by an exceptional microstructure with a highly solid-soluted matrix and uniformly refined ***,the alloys exhibited excellent biocompatibility and did not cause undesirable inflammation or produce toxic degradation *** improvements in biocompatibility and degradation characteristics indicate great promise for the use of this friction stir processed alloy in osteosynthesis systems in the clinical setting.

关键词： Magnesium alloy Friction stir processing Microstructural evolution Biodegradable Biocompatibility

来源：评论

学校读者我要写书评

暂无评论

Iron anode-based aqueous electrochemical energy storage devices: Recent advances and future perspectives

引用

Interdisciplinary materials 2022年第1期1卷 116-139页

作者： Jian Jiang Jinping Liu Chongqing Key Lab for Advanced Materials and Clean Energies of Technologies School of Materials and EnergySouthwest UniversityChongqingChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of ChemistryChemical Engineering and Life ScienceWuhan University of TechnologyWuhanChina Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbinChina

The ever-growing demands for green and sustainable power sources for ap-plications in grid-scale energy storage and portable/wearable devices have enabled the continual development of advanced aqueous electrochemical energy storage(EES)*** batteries and supercapacitors made of iron-based anodes are one of the most promising options due to the remark-able electrochemical features and natural abundance,pretty low cost and good environmental friendliness of ferruginous *** impressive ad-vances in developing the state-of-the-art ferruginous anodes and designing various full-cell aqueous devices have been made,there still remain key issues and challenges on the way to practical applications,which urgently need discussing to put forwards possible *** this review,rather than focusing on the detailed methods to optimize the iron anode,electrolyte,and device performance,we first give a comprehensive review on the charge storage mechanisms for ferruginous anodes in different electrolyte systems,as well as the newly developed iron-based aqueous EES *** deep in-sights,involving the inherent failure mechanisms and corresponding modification/optimization strategies toward iron anodes for the development of high-performance aqueous EES devices,will then be *** advances in applying iron-based aqueous EES devices for emerging fields such as flexible/wearable electronics and functionalized building materials will be further ***,future research trends and perspectives for maximizing the potential of current iron anodes and devices as well as exploiting brand-new iron-based aqueous EES systems are put forward.

关键词： aqueous batteries battolyser charge storage mechanism hybrid supercapacitors iron anode

来源：评论

学校读者我要写书评

暂无评论

Cobalt-Free BaFe_(0.6)Zr_(0.1)Y_(0.3)O_(3−δ)Oxygen Electrode for Reversible Protonic Ceramic Electrochemical Cells

引用

Transactions of Tianjin University 2023年第6期29卷 444-452页

作者： Chenghao Yang Jin Li Ao Hu Jian Pu Bo Chi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials MOE Key Laboratory for the Green Preparation and Application of Functional MaterialsFaculty of Materials Science and EngineeringHubei UniversityWuhan 430062China MOE Key Laboratory of Material Chemistry for Energy Conversion and Storage Huazhong University of Science and TechnologyWuhan 430074China

Reversible protonic ceramic electrochemical cells(R-PCECs)are ideal,high-effi ciency devices that are environmentally friendly and have a modular *** paper studies BaFe_(0.6)Zr_(0.1)Y_(0.3)O_(3−δ)(BFZY3)as a cobalt-free perovskite oxygen electrode for high-performance R-PCECs where Y ions doping can increase the concentration of oxygen vacancies with a remarkable increase in catalytic *** cell with confi guration of Ni-BZCYYb/BZCYYb/BFZY3 demonstrated promising performance in dual modes of fuel cells(FCs)and electrolysis cells(ECs)at 650℃with low polarization resistance of 0.13Ωcm^(2),peak power density of 546.59 mW/cm^(2)in FC mode,and current density of−1.03 A/cm^(2)at 1.3 V in EC *** alternative operation between FC and EC modes for up to eight cycles with a total of 80 h suggests that the cell with BFZY3 is exceptionally stable and reversible over the long *** results indicated that BFZY3 has considerable potential as an air electrode material for R-PCECs,permitting effi cient oxygen reduction and water splitting.

关键词： Protonic ceramic cells Oxygen electrode Perovskite oxides Cobalt-free Oxygen vacancies

来源：评论

学校读者我要写书评

暂无评论

Boosting Li-ion storage in Li2MnO_(3) by unequal-valent Ti4+-substitution and interlayer Li vacancies building

引用

Chinese Chemical Letters 2023年第4期34卷 564-569页

作者： Yu Tian Yuling Zhao Fanqi Meng Kaicheng Zhang Yanyuan Qi Yujie Zeng Congcong Cai Yuli Xiong Zelang Jian Yang Sun Lin Gu Wen Chena School of Materials Science and Engineering Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China C Innovation Laboratory Contemporary Amperex Technology Ltd.(CATL)Ningde 352100China Institute of Physics Chinese Academy of SciencesBeijing 100190China Sanya Science and Education Innovation Park of Wuhan University of Technology Wuhan 430070China

Lithium rich layered oxide(LRLO) has been considered as one of the promising cathodes for lithium-ion batteries(LIBs). The high voltage and large capacity of LRLO depend on Li2MnO_(3)phase. To ameliorate the electrochemical performance of Li2MnO_(3), also written as Li(Li1/3Mn2/3)O_(2), we propose a strategy to substitute Mn4+and Li+in Mn/Li transition metal layer with Ti4+, which can stabilize the structure of Li2MnO_(3)by inhibiting the excessive oxidation of O_(2)-above 4.5 V. More significantly, the unequal-valent substitution brings about the emergence of interlayer Li vacancies, which can promote the Li-ion diffusion based on the enlarged interlayer and increase the capacity by activating the Mn3+/4+redox. We designed Li0.7[Li1/3Mn2/3]0.7Ti0.3O_(2)with high interlayer Li vacancies, which presents a high capacity(290 m Ah/g at 10 m A/g) and stable cycling performance(84% over 60 cycles at 50 m A/g). We predict that this strategy will be helpful to further improve the electrochemical performance of LRLOs.

关键词： Lithium-ion batteries Li2MnO_(3) Unequal-valent Ti4+-substitution Interlayer Li vacancies Activated Mn3+/4+redox

来源：评论

学校读者我要写书评

暂无评论

分子间相互作用调控丝素蛋白/聚丙烯酰胺水凝胶的网络形貌和β片结晶,赋予水凝胶优异的黏附、应变和传感性能

引用

Science China materials 2024年第5期67卷 1533-1542页

作者：杨德桢孙传强韩哲袁宝刚潘栋陈金传许华杰刘春太申长雨 State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing Technologythe Key Laboratory of Advanced Materials Processing&Mold of Ministry of EducationZhengzhou UniversityZhengzhou450002China

丝素蛋白(SF)作为一种特殊的天然聚合物,具有优异的生物相容性、生物降解性和双亲性,是制备柔性传感器的良好候选者.然而,丝素蛋白的高结晶度和结晶不可控性使获得这种出色的仿生水凝胶传感器具有挑战性.纯SF水凝胶是脆性的,没有黏性.在... 详细信息

丝素蛋白(SF)作为一种特殊的天然聚合物,具有优异的生物相容性、生物降解性和双亲性,是制备柔性传感器的良好候选者.然而,丝素蛋白的高结晶度和结晶不可控性使获得这种出色的仿生水凝胶传感器具有挑战性.纯SF水凝胶是脆性的,没有黏性.在此,我们通过引入聚丙烯酰胺(PAM)到SF水凝胶中来解决这一问题.由于SF/PAM水凝胶具有较强的分子间相互作用,其网络形貌由欧几里得孔改变为非欧几里得孔.同时,其β片结晶很容易被抑制到纳米尺度.这些演变不仅使SF/PAM水凝胶具有优异的机械性能,而且具有出色的黏附性能.与纯PAM水凝胶相比,SF8/PAM水凝胶的拉伸强度、拉伸破坏应变、抗压强度(80%应变下)和黏附性能(在猪皮上)分别提高了133.1%、120.9%、610.8%和104.8%.此外,SF的双亲性可以使碳纳米管(CNTs)在水凝胶中分散良好.制备的CNT0.3/SF8/PAM水凝胶继承并进一步改善了上述性能.除此之外,它还表现出优异的自黏附传感性能,最大灵敏度因子高达10.13,工作应变范围超过1000%,大应变下稳定循环拉伸达500次以上.同时,六种人类活动的精确检测也得到了验证.本工作为实现高性能SF基水凝胶提供了新策略,并证实SF/PAM水凝胶在柔性可穿戴应变传感器中具有广阔的应用前景.

关键词： silk fibroin intermolecular interaction network morphology β-crystallization adhesion hydrogel strain sensor

来源：评论

学校读者我要写书评

暂无评论

Slow Photon-Enhanced Heterojunction Accelerates Photocatalytic Hydrogen Evolution Reaction to Unprecedented Rates

引用

CCS Chemistry 2023年第2期5卷 372-384页

作者： Jing Liu Yin-Hao Guo Zhi-Yi Hu Heng Zhao Ze-Chuan Yu Lihua Chen Yu Li Gustaaf Van Tendeloo Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 Wuhan Nanostructure Research Centre(NRC) Wuhan University of Technology430070 Wuhan School of Civil Engineering and Architecture Wuhan University of Technology430070 Wuhan EMAT University of AntwerpB-2020 Antwerp Laboratory of Inorganic Materials Chemistry(CMI) University of NamurB-5000 Namur

In photocatalysis,both the photogenerated charge separation and transport and the induced light utilization greatly influence *** this work,highly ordered CdS@ZnO core-shell inverse opal(CdS@ZnO-csIO)nanocomposites have been successfully designed as a model to couple the heterojunction system with the slow photon effect for photocatalytic H2 *** calculations and experimentation provide direct evidence for the slow photon effect in the CdS@ZnO-csIO *** type II heterojunction is responsible for promoting the migration and separation of photogenerated charges,and the slow photon effect is in charge of enhancing light harvesting in the CdS@ZnO-csIO *** synergy of two functions gives rise to a significantly enhanced photocatalytic H2 production rate under simulated solar light for the CdS@ZnO-csIO *** highest H2 production rate reaches 48.7 mmol g^(−1)h^(−1)under simulated solar light with the benchmark performance for all reported CdS@ZnO *** work provides proof-of-principle that coupling the heterojunction system with the slow photon effect can greatly enhance the photocatalytic activity of composite photocatalysts.

关键词： type II heterojunction slow photon effect CdS@ZnO nanocomposites 3D core-shell inverse opal nanocomposites photocatalytic H2 production

来源：评论

学校读者我要写书评

暂无评论

Boosting molecular diffusion following the generalized Murray's Law by constructing hierarchical zeolites for maximized catalytic activity

引用

国家科学评论（英文版） 2022年第12期9卷 143-156页

作者： Ming-Hui Sun Shu-Shu Gao Zhi-Yi Hu Tarek Barakat Zhan Liu Shen Yu Jia-Min Lyu Yu Li Shu-Tao Xu Li-Hua Chen Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamur B-5000Belgium Division of Analysis Sinopec Beijing Research Institute of Chemical IndustryBeijing 100013China National Engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Nanostructure Research Centre Wuhan University of TechnologyWuhan 430070China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamur B-5000Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China National Engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Diffusion is an extremely critical step in zeolite catalysis that determines the catalytic performance,in particular for the conversion of bulky *** interconnected mesopores and macropores into a single microporous zeolite with the rationalized pore size at each level is an effective strategy to suppress the diffusion limitations,but remains highly challenging due to the lack of rational design ***,we demonstrate the first example of boosting molecular diffusion by constructing hierarchical Murray zeolites with a highly ordered and fully interconnected macro-meso-microporous structure on the basis of the generalized Murray's *** a hierarchical Murray zeolite with a refined quantitative relationship between the pore size at each length scale exhibited 9 and 5 times higher effective diffusion rates,leading to 2.5 and 1.5 times higher catalytic performance in the bulky 1,3,5-triisopropylbenzene cracking reaction than those of microporous ZSM-5 and ZSM-5 nanocrystals,*** concept of hierarchical Murray zeolites with optimized structural features and their design principles could be applied to other catalytic reactions for maximized performance.

关键词： catalytic cracking generalized Murray's Law hierarchical Murray structure ordered porous hierarchy zeolites

来源：评论

学校读者我要写书评

暂无评论

Tunable Atomic-Scale Steps and Cavities Break Both Stability and Activity Limits of CoO_(x) Nanosheets to Catalyze Oxygen Evolution

引用

Renewables 2023年第4期1卷 465-473页

作者： Min Yu Xueqin Mu Weitao Meng Ziyue Chen Yu Tong Yu Ge Shiyuan Pang Shengjie Li Suli Liu Shichun Mu Key Laboratory of Advanced Functional Materials of Nanjing Nanjing Xiaozhuang UniversityNanjing 211171 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070

A highly active interface can enhance the catalytic efficiency of catalysts toward the oxygen evolution reaction(OER).However,accurately tuning their atomic interface configurations of defects with sufficient activity and stability remains a grand ***,we report on breaking the activity and stability limits of CoO_(x) nanosheets in the OER process by constructing copious high-energy atomic steps and cavities,in which S or Ce atoms simultaneously replace O or Co atoms from CoO_(x),thus achieving high-energy atomic interface Ce,O-Co_(3)S_(4) *** combining in situ characterization and density functional theory calculations,it is shown that the unique orbital coupling between Ce-4f,O(S)-2p,and Co-3d causes it to be closer to the Fermi level,leading to faster charge transfer *** importantly,the novel structure breaks the stability limit of cobalt sulfide with planar defects,which gives high catalytic activity and stability in 0.1 M KOH solutions,better than commercial RuO_(2) and IrO_(2) noble metal *** expected,Ce,O-Co_(3)S_(4) possesses much better turnover frequency activity(0.064 s^(-1))at an overpotential of 300 mV,which is ~7 times larger than that of Ce-CoO_(x)(0.009 s^(-1)).Our work presents a new perspective of designing catalysts with atomically dispersed orbital electronic coupling defects toward efficient OER electrocatalysis.

关键词： atomic replacement amorphous structures interface active centers atomic defect oxygen evolution reaction

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：