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Interface engineering via molecules/ions/groups for electrocatalytic water splitting

Nano Research 2024年第9期17卷 7864-7879页

作者： Defang Ding youwen liu Fan Xia Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and Engineering Huazhong University of Science and Technology WuhanHubei 430074China

The electrochemical water splitting to produce hydrogen converts electric energy into clean hydrogen energy,which is a groundbreaking concept of energy *** achieve high efficiency,numerous strategies have been developed to enhance the performance of *** these,interface engineering with molecules/ions/groups,serves as a versatile approach for optimizing the performance of electrocatalysts in water *** the basis of numerous achievements in high-performance electrocatalysts engineered through molecules/ions/groups at interface,a comprehensive understanding of these advancements is crucial for guiding future ***,after providing a concise overview of the background,the interface engineering via molecules/ions/groups for electrocatalytic water splitting is demonstrated from three ***,the engineering of electronic state of electrocatalysts by molecules/ions/groups at interface to reduce the Gibbs free energy of the corresponding ***,the modification of local microenvironment surrounding electrocatalysts via molecules/ions/groups at interface to enhance the transfer of reactants and ***,the protection of electrocatalysts with molecule/ion/group fences improves their durability,including protecting active sites from leaching and defending them against harmful *** fundamental principles of these three aspects are outlined for each,along with pertinent ***,several research directions and challenges are proposed.

关键词： electrocatalyst water splitting interface engineering molecules/ions/groups

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Sequential reactant water management by complementary multisite catalysts for surpassing platinum hydrogen evolution activity

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Nano Research 2024年第3期17卷 1232-1241页

作者： Yu Lin Defang Ding Shicheng Zhu Qunlei Wen Huangjingwei Li Zhen Li youwen liu Yi Shen China Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430078China State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Alkaline hydrogen evolution reaction(HER)offers a near-zero-emission approach to advance hydrogen ***,the activity limited by the multiple reaction steps involving H_(2)O molecules transfer,absorption,and activation still unqualified the thresholds of economic ***,we proposed a multisite complementary strategy that incorporates hydrophilic Mo and electrophilic V into Ni-based catalysts to divide the distinct steps on atomically dispersive sites and thus realize sequential regulation of the HER *** Isotopic labeled in situ Raman spectroscopy describes 4-coordinated hydrogen bonded H_(2)O to be free H_(2)O passing the inner Helmholtz plane in the vicinity of the catalysts under the action of hydrophilic Mo ***,potential-dependent electrochemical impedance spectroscopy(EIS)reveals that electrophilic V sites with abundant 3d empty orbitals could activate the lone-pair electrons in the free H_(2)O molecules to produce more protic hydrogen,and dimerize into H_(2) at the Ni *** the sequential management of reactive H_(2)O molecules,NiMoV oxides multisite catalysts surpass Pt/C hydrogen evolution activity(49 mV@10 mA∙cm^(-2) over 140 h).Profoundly,this study provides a tangible model to deepen the comprehension of the catalyst–electrolyte interface and create efficient catalysts for diverse reactions.

关键词： hydrogen evolution activity complementary multisite catalysts sequential reactive water management interfacial water molecules

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关节翻修领域热点问题:感染、康复护理、骨缺损及假体松动

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中国组织工程研究 2025年第9期29卷 1963-1971页

作者：梁浩博王泽宇马文龙刘浩刘又文河南中医药大学骨伤学院河南省郑州市450016 河南省洛阳正骨医院(河南省骨科医院) 河南省洛阳市471000

背景:随着国内人口老龄化进展,关节置换手术的数量不断增长,与之对应的是关节翻修手术的数量也随之增加。定性、定量分析关节翻修领域的研究现状、研究热点和研究前沿具有重要意义。目的:通过文献计量学方法对近20年来关节翻修领域相关... 详细信息

背景:随着国内人口老龄化进展,关节置换手术的数量不断增长,与之对应的是关节翻修手术的数量也随之增加。定性、定量分析关节翻修领域的研究现状、研究热点和研究前沿具有重要意义。目的:通过文献计量学方法对近20年来关节翻修领域相关文献进行可视化分析,探索该领域的研究热点与动态趋势,以期为进一步研究提供参考。方法:计算机检索中国知识资源总库(CNKI)、中文科技期刊数据库(VIP)、中国学术期刊数据库(万方数据)2003-01-01/2022-12-31收录的关节翻修的相关文献,使用Note Express(3.***.0.9588)软件剔除重复数据,并采用CiteSpace(6.2.R6)、VOS viewer(1.6.20)和Excel(2016)软件对发文量、作者及机构合作网络、关键词共现、突现及聚类绘制科学知识图谱。结果与结论:①共纳入文献1806篇,近20年该领域年发文量总体态势趋于稳定;②对合作网络分析可知,发文量最多和中介中心性最高的作者是周一新,发文量最多的机构是周一新任职的北京积水潭医院,而中介中心性最高的机构是中国人民解放军总医院;③对关键词分析可知,关节翻修领域的研究热点主要集中在髋关节、感染、康复护理、骨缺损和假体松动等方面;④对关节翻修领域的文献进行可视化分析有利于理清研究脉络,为研究学者们提供研究思路及方法,并揭示该领域的研究态势和前沿热点。

关键词：关节翻修髋关节假体关节置换 CiteSpace VOS viewer 文献计量学可视化分析

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A WEDGE DISCLINATION DIPOLE INTERACTING WITH A COATED CYLINDRICAL INHOMOGENEITY

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Acta Mechanica Solida Sinica 2015年第1期28卷 62-73页

作者： Yingxin Zhao Qihong Fang youwen liu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University College of Mechanical and Vehicle Engineering Hunan University

A three-phase composite cylinder model is utilized to study the interaction of a wedge disclination dipole with a coated cylindrical inhomogeneity. The explicit expression of the force acting on the wedge disclination dipole is calculated. The motilities and the equilibrium po- sitions of the disclination dipole near the coated inhomogeneity are discussed for various material combinations, relative thicknesses of the coating layer and the features of the disclination dipole. The results show that the material properties of the coating layer have a major part to play in alteringi the strengthening effect or toughening effect produced by the coated inhomogeneity.

关键词： three-phase composite disclination dipole coating layer complex variable function method

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镍基合金车削表面粗糙度理论分析与实验研究

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机械工程师 2024年第1期 142-145页

作者：陈刚刘有文李红安徽天航机电有限公司安徽芜湖241000

高温合金GH4169具有良好的机械性能,广泛应用于航空、精密装配等领域。在精密车削加工中难以保证零件表面粗糙度要求。为了研究切削参数对加工表面粗糙度的影响关系,根据正交试验数据,运用极差与方差分析出切削三要素对加工表面粗糙度... 详细信息

高温合金GH4169具有良好的机械性能,广泛应用于航空、精密装配等领域。在精密车削加工中难以保证零件表面粗糙度要求。为了研究切削参数对加工表面粗糙度的影响关系,根据正交试验数据,运用极差与方差分析出切削三要素对加工表面粗糙度的影响关系,预测出表面粗糙度与切削三要素之间的最优模型,对分析表面粗糙度与切削三要素之间的响应关系,基于最优预测模型,运用多目标线性规划模型优化参数,得出在切削GH4169过程中的最优参数,为以后加工GH4169奠定了理论基础。

关键词：正交实验粗糙度预测模型 GH4169

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INTERACTION OF A DISLOCATION DIPOLE WITH A MODE III INTERFACE CRACK

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Acta Mechanica Solida Sinica 2007年第1期20卷 50-56页

作者： Jin Bo Fang Qihong liu youwen College of Civil Engineering Hunan University Changsha 410082 China College of Mechanics and Aerospace Hunan University Changsha 410082 China

Interaction between a screw dislocation dipole and a mode III interface crack is investigated. By using the complex variable method, the closed form solutions for complex potentials are obtained when a screw dislocation dipole lies inside a medium. The stress fields and the stress intensity factors at the tip of the interface crack produced by the screw dislocation dipole are given. The influence of the orientation, the dipole arm and the location of the screw dislocation dipole as well as the material mismatch on the stress intensity factors is discussed. The image force and the image torque acting on the screw dislocation dipole center are also calculated. The mechanical equilibrium position of the screw dislocation dipole is examined for various material property combinations and crack geometries. The results indicate that the shielding or anti-shielding effect on the stress intensity factor increases abruptly when the dislocation dipole approaches the tip of the crack. Additionally, the disturbation of the interface crack on the motion of the dislocation dipole is also significant.

关键词： dislocation dipole interface crack image force image torque

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A SCREW DISLOCATION IN A THREE-PHASE COMPOSITE CYLINDER MODEL WITH INTERFACIAL RIGID LINES

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Acta Mechanica Solida Sinica 2005年第4期18卷 283-294页

作者： Fang Qihong liu youwen Jiang Chiping Department of Engineering Mechanics Hunan University Changsha 410082 China Solid Mechanics Research Center Beijing University of Aeronautics and Astronautics Beijing 100083 China

The problem of the elastic interaction between a screw dislocation and a three-phase circular inclusion with interracial rigid lines （anti-cracks） is investigated. An efficient and concise method for the complex multiply connected region is developed, with which explicit series form solutions of the complex potentials in the matrix, and the interphase layer and inclusion regions are derived. Based on the complex potentials, the image force on the screw dislocation is then calculated by using the Peach-Koehler formula. The equilibrium position of the dislocation is discussed in detail for various rigid line geometries, interphase layer thicknesses and material property combinations. The main results show that the interracial rigid lines exert a significant perturbation effect on the motion of the screw dislocation near the circular inclusion surrounded by an interphase layer.

关键词： screw dislocation interfacial rigid lines interphase layer complex potential method,image force

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光纤扫描式李萨如轨迹近眼显示系统设计

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光学精密工程 2024年第9期32卷 1273-1282页

作者：吴彤杨翔宇邹谨聪刘友文王玲王吉明路元刚赫崇君南京航空航天大学航天学院空间光电探测与感知工业和信息化部重点实验室江苏南京211106 南京航空航天大学物理学院江苏南京211106 杭州电子科技大学自动化学院浙江杭州310018

为了进一步小型化头戴式显示装置(Head-worn Display,HWD),提出一种基于非对称光纤悬臂梁(Asymmetrical Fiber Cantilever,AFC)的李萨如轨迹扫描近眼显示系统,以及李萨如轨迹上的像素划分准则。研究了该系统的扫描轨迹、图像重建能力、... 详细信息

为了进一步小型化头戴式显示装置(Head-worn Display,HWD),提出一种基于非对称光纤悬臂梁(Asymmetrical Fiber Cantilever,AFC)的李萨如轨迹扫描近眼显示系统,以及李萨如轨迹上的像素划分准则。研究了该系统的扫描轨迹、图像重建能力、显示分辨率和显示帧速率的影响因素。根据高分辨率、高帧速率指标设计了正交谐振频率组成,确定了非对称光纤悬臂梁的结构参数。研制的显示单元实物直径为2 mm,长度为19 mm。谐振频率下的分辨率为160×120 pixel,帧速率为10 Hz,图像重建误差率为0.002%,最高分辨率能够达到290×220 pixel,最高帧速率为95 Hz。基于显示单元实物搭建了光纤扫描式近眼显示系统,使用相机模拟人眼观察记录了该显示系统的实验结果,验证了基于非对称光纤悬臂梁的HWD显示性能及其未来应用潜力。

关键词：近眼显示头戴式显示装置李萨如轨迹非对称光纤悬臂梁像素划分

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Chemical-vapor-deposition-grown 2D transition metal dichalcogenides:A generalist model for engineering electrocatalytic hydrogen evolution

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Nano Research 2023年第1期16卷 101-116页

作者： Yang Zhao Jiazhao Huang Jianqiang Chen youwen liu Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074China

Two-dimensional(2D)transition metal dichalcogenides(TMDs)have proved to possess exceptional catalytic performance for hydrogen evolution and are considered to be an appropriate substitute for commercial Pt-based ***,chemical vapor deposition(CVD)is an extremely important technique for acquiring controllable and high-purity TMDs for electrocatalysis and modern electronic ***,researchers have made significant achievements in synthesizing TMDs used for electrocatalytic hydrogen evolution by CVD ranging from dynamic mechanism exploration to performance *** this review,we present the recent progress based on electrocatalytic hydrogen evolution implemented by CVDgrowth TMDs nanosheets and unveil the structural–activity ***,in synthesis,diverse factors covering precursor,substrate,temperature settings,and atmosphere will affect the quality and surface morphology of ***,we present the current research status of the CVD-grown 2D TMDs for engineering electrocatalytic hydrogen evolution,including intrinsic performance exploring,morphology engineering,composition adjusting,phase engineering,and vertically-oriented structure ***,the future prospects and challenges of CVD in 2D TMDs electrocatalysis are provided.

关键词： chemical vapor deposition two-dimensional(2D)transition metal dichalcogenides electrochemistry hydrogen evolution on-chip electrocatalysis

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Trajectory engineering via a space-fractional Schrodinger equation with dynamic linear index potential

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Chinese Physics B 2020年第5期29卷 229-234页

作者： Yunji Meng youwen liu Haijiang Lv School of Information Engineering Huangshan UniversityHuangshan 245041China College of Science Nanjing University of Aeronautics and AstronauticsNanjing 211106China

We theoretically and numerically study the propagation dynamics of a Gaussian beam modeled by the fractional Schrodinger equation with different dynamic linear potentials. For the limited case α = 1(α is the Lévy index) in the momentum space, the beam suffers a frequency shift which depends on the applied longitudinal modulation and the involved chirp. While in the real space, by precisely controlling the linear chirp, the beam will exhibit two different evolution characteristics: one is the zigzag trajectory propagation induced by multi-reflection occurring at the zeros of spatial spectrum,the other is diffraction-free propagation. Numerical simulations are in full accordance with the theoretical results. Increase of the Lévy index not only results in the drift of those turning points along the transverse direction, but also leads to the delocalization of the Gaussian beam.

关键词： trajectory engineering space-fractional Schrodinger equation dynamic linear index potential

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