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Interfacial electronic coupling of V-doped Co_(2)P with high-entropy MXene reduces kinetic energy barrier for efficient overall water splitting

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Journal of Energy Chemistry 2023年第10期85卷 301-309,I0009页

作者： Wansen Ma Zeming Qiu Jinzhou Li Liwen Hu Qian Li Xuewei lv jie Dang College of Materials Science and Engineering Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New MaterialsChongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Developing efficient,low-cost non-noble metal-based bifunctional catalysts to achieve excellent hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)kinetics in alkaline media is challenging but very ***,improving the electronic structure of the catalyst to optimize the adsorption of intermediates and reduce the reaction energy barrier is the key to improve the reaction ***,a V-doped Co_(2)P coupled with high-entropy MXene heterostructure catalyst(V-Co_(2)P@HE)was prepared by a two-step electrodeposition and controlled phosphorization *** analyses of X-ray absorption spectroscopy,X-ray photoelectron spectroscopy and theoretical calculations jointly show that the introduction of V and the strong electron coupling between the two components optimize the adsorption energy of water molecules and reaction *** from the abundant active sites and optimizing intermediate adsorption energy and heterogeneous interface electronic structure,V-Co_(2)P@HE has excellent HER and OER activity and long-term stability under alkaline *** particular,when assembled as cathode and anode,the bifunctional V-Co_(2)P@HE catalyst can drive a current density of 10 mA cm^(-2)with only 1.53 *** work provides new strategies for the application of highentropy MXene and the design of novel non-noble metal-based bifunctional electrolytic water catalysts.

关键词： Transition metal phosphides High-entropy MXene HER OER

Observation of As-Grown Defects in Zn-Doped GaAs by Positron Lifetime Spectra

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Chinese Physics Letters 2000年第11期17卷 841-843页

作者： WANG Zhu WANG shao-jie CHEN Zhi-Quan Department of Physics Wuhan UniversityWuhan 430072

Positron lifetime spectra were measured for the Zn-doped p-type *** comparing the horizontal-Bridgman-method-grown and the floating-zone-method grown p-type GaAs with the liquid-encapsulation-Czochralski-grown p-type GaAs samples,positron trapping into vacancy type defects was observed in the former two grown p-type *** positron traps were detected,and the dominant ones were attributed to acceptor the in p-type GaAs.

关键词： positron attributed floating

Constructing heterostructures of ZIF-67 derived C,N doped Co_(2)P and Ti_(2)VC_(2)T_(x)MXene for enhanced OER

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Journal of Materials Science & Technology 2023年第14期145卷 74-82页

作者： Jinzhou Li Chao Chen Zepeng lv Wansen Ma Meng Wang Qian Li jie Dang College of Materials Science and Engineering Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Oxygen evolution reaction(OER)is central to technologies such as electrochemical water splitting,and developing efficient and low-cost non-precious metal electrocatalysts for OER is of great significance to reducing cell voltage and developing hydrogen production by electrochemical water ***,we prepared a carbon,nitrogen co-doped porous Co_(2)P derived from the metal-organic framework(ZIF-67),which is anchored on bimetallic MXene nanosheets(named MX@MOF-Co_(2)P).It was used as the OER catalyst and exhibited great electrocatalytic performance with very small overpotentials(246 mV at 10 mA^(-2)and 407 mV at 200 mA cm^(-2))as well as ultralow Tafel slope(28.18 mV dec^(-1)).Combining charac-terizations and theoretical calculations,it was found that the remarkable performance was from follows:the obtained MX@MOF-Co_(2)P inherited the porous structure of the pristine MOF with a large number of open active sites;carbon and nitrogen doping also modulated the electronic structure of the active center;the synergistic effect between cobalt phosphide and MXenes booted the electronic *** work represents a promising strategy for the development of non-precious metal catalysts derived from metal-organic frameworks to achieve efficient energy conversion.

关键词： Mxene mof doping cobalt phosphide electrocatalysts

Distance-Coefficient-Based Imaging Accuracy Improving Method Based on the Lamb Wave

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Chinese Physics Letters 2017年第4期34卷 55-59页

作者： shao-jie Chen shao-Ping Zhou Yong Li Yan-Xun Xiang Min-Xin Qi Key Lab of Pressure Systems and Safety (MOE) East China University of Science and Technology Shanghai 200237

An imaging accuracy improving method is established, within which a distance coefficient including location information between sparse array configuration and the location of defect is proposed to select higher signal- to-noise ratio data from all experimental data and then to use these selected data for elliptical imaging. Tile relationships among imaging accuracy, distance coefficient and residual direct wave are investigated, and then the residual direct wave is introduced to make the engineering application more convenient. The effectiveness of the proposed method is evaluated experimentally by sparse transducer array of a rectangle, and the results reveal that selecting experimental data of smaller distance coefficient can effectively improve imaging accuracy. Moreover, the direct wave difference increases with the decrease of the distance coefficient, which implies that the imaging accuracy can be effectively improved by using the experimental data of the larger direct wave difference.

关键词： Distance-Coefficient-Based Imaging Accuracy Improving Method Based on the Lamb Wave

Interaction Between Dopants and Native Defects in Zn Doped p-InP Observed by Positron Annihilation

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Chinese Physics Letters 1999年第8期16卷 586-588页

作者： CHEN Zhi-quan WANG Zhu WANG shao-jie Department of Physics Wuhan UniversityWuhan 430072

Positron lifetime spectra were measured for three Zn doped p-InP samples as a function of temperature. Interaction of Zn dopants and native P vacancies was observed under thermal activation. It is found that the formation of Zn-Vp complex has a correlation with the carrier concentration. The formation mechanism of the complex was tentatively discussed.

关键词： temperature. Defects lifetime

Microstructure and wear behaviors of TiB/TiC reinforced Ti2Ni/α(Ti) matrix coating produced by laser cladding

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Rare Metals 2020年第3期39卷 304-315页

作者： Jin-Zhong shao Jun Li Rui Song lv-Lin Bai Jia-Li Chen Cui-Cui Qu School of Materials Engineering Shanghai University of Engineering ScienceShanghai201620China

A Ti2Ni/a(Ti)matrix composite coating reinforced by TiC and TiB was prepared on a Ti6A14V substrate by laser *** microstructure of the coating was examined and *** wear behavior of the coating at various sliding speeds was investigated from the perspective of energy dissipation,and the relationship between accumulated dissipated energy(ΣE)and accumulated wear volume(ΣV)was *** indicate a good linear relationship betweenΣE andΣV at low sliding speed(0.1 m·s-1);at higher sliding speed(0.2 m·s-1),the relationship between these parameters follows a quadratic *** results may be explained from the perspective of energy transformation,wherein the friction heat and plastic deformation of the coating surface consume a substantial amount ofΣE at high sliding speed(0.2 m·s-1)and the remainder of the energy is used to produce worn coating *** wear mechanism of the coating involves a combination of microcutting and brittle debonding accompanied by oxidization of the worn surface and formation of Al2O3 adherents.

关键词： Wear behaviors Coating Laser cladding Accumulated dissipated energy

Photocatalyst/metal-free sequential C-N/C-S bond formation:Synthesis of S-arylisothioureas via photoinduced EDA complex activation

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Chinese Chemical Letters 2024年第11期35卷 361-366页

作者： Guoju Guo Xufeng Li jie Ma Yongjia Shi Jian lv Daoshan Yang College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China Zhejiang Wansheng Co.Ltd. Linhai 317000China National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass Nanjing Forestry UniversityNanjing 210037China

A photocatalyst-free visible-light-promoted three-component reaction of thianthrenium salts,isothiocyanates,and amines is presented,which affords a rapid and efficient approach to S-arylisothioureas under mild *** developed method exhibits the advantages of readily available raw materials,broad substrate scope,good functional tolerance,and operational *** is worth mentioning that the byproduct thianthrene can be recycled in quantity,ultimately maximizing the atomic economy of the reaction and avoiding chemical *** investigations support the strategy involving a photoinduced EDA complex.

关键词： Visible-light Photocatalyst-free EDA complex Thianthrenium salts S-arylisothioureas

Effect of different bottom blowing elements on stirring characteristics of molten bath in converter

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Journal of Iron and Steel Research International 2024年第2期31卷 368-376页

作者： Ming lv Shuang-ping Chen Hong-min Guo Yi-jie Hao Xiang-dong Xing School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina Shaanxi Longmen Steel Company Hancheng715405ShaanxiChina

The bottom blowing element is the key equipment to ensure the bottom blowing effect of the *** types of bottom blowing elements,dispersive type(D1),double circular seam(D2)and straight cylinder type(D3),were built,and the effects of bottom blowing element type on molten bath flow,wall erosion and furnace bottom erosion were *** was found that when the bottom blowing elements of dispersive type(D1)and double circular seam(D2)were used,the dead zone area in the lower part of the molten bath was smaller,and the high-speed zone area was larger;therefore,the stirring effect on the bottom melt was *** the straight cylinder type(D3)bottom blowing element was used,the gas penetrated the molten bath at a faster rate to reach the surface of molten bath and failed to disperse in the bottom molten bath,and the wall shear stress near the nozzle outlet was *** argon was blown by three different bottom blowing elements,the area of the wall shear stress greater than 3 Pa was 4.8,5.6 and 8.7 cm2,respectively,within 0.2 m of the bottom blowing nozzle outlet.

关键词： Converter steelmaking Bottom blowing element Molten bath stirring Wall erosion

Application of Finite Element Analysis for Investigation of Intervertebral Disc Degeneration:from Laboratory to Clinic

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Current Medical Science 2019年第1期39卷 7-15页

作者： Bin-wu HU Xiao lv Song-feng CHEN Zeng-wu shao Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Orthopaedic Surgery The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052China

Due to the ethical concern and inability to detect inner stress distributions of intervertebral disc(IVD),traditional methods for investigation of intervertebral disc degeneration(IVDD)have significant *** researchers have demonstrated that finite element analysis(FEA)is an effective tool for the research of ***,the specific application of FEA for investigation of IVDD has not been systematically elucidated *** the present review,we summarize the current finite element models(FEM)used for the investigation of IVDD,including the poroelastic non linear FEM,difTusive-reactive theory model and cell-activity coupled mechano-electrochemical theory *** further elaborate the use of FEA for the research of IVDD pathogenesis especially for nutrition and biomechanics associated etiology,and the biological,biomechanical and clinical influences of *** addition,the application of FEA for evaluation and exploration of various treatments for IVDD is also *** conclude that FEA is an excellent technique for research of IVDD,which could be used to explore the etiology,biology and biomechanics of *** the future,FEA may help us to achieve the goal of individualized precision therapy.

关键词： finite element analysis intervertebral disc degeneration biomechanics spine