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Continuous synthesis of few-layer MoS_(2) with highly electrocatalytic hydrogen evolution

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Green Energy & Environment 2021年第6期6卷 858-865页

作者： Meng Shao Peican wang yimeng wang Baoguo wang Yundong wang Jianhong Xu The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China

As one of the most promising alternative fuels,hydrogen is expected with high *** electrolysis of water is regarded as the cleanest and most efficient method of hydrogen *** disulfide(MoS_(2))is deemed as one of the most promising alternatives HER catalysts owing to its high catalytic activity and low *** continuous production and efficient preparation become the key problems in future industrial *** this work,we first developed a continuous micro-reaction approach with high heat and mass transfer rates to synthesize few-layer MoS_(2)nanoplates with abundant active *** defective MoS_(2)ultrathin nanoplates exhibit excellent HER performance with an overpotential of 260 m V at a current density of 10 m A cm^(-2),small Tafel slope(53.6 m V dec^(-1))and prominent durability,which are comparable to most reported MoS_(2)based *** the existence of continuous devices,it's suitable for the synthesis of MoS_(2)as highperformance electrocatalysts for the industrial water *** novel preparation method may open up a new way to synthesize all two-dimension materials toward HER.

关键词： MoS_(2) Micro-reactor Ultrathin Nanoplates Hydrogen evolution reaction

Mechanism of corrosion behavior induced by precipitates under plastic compressive stress in Mg-Gd-Y alloys

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Journal of Rare Earths 2024年第12期42卷 2183-2195页

作者： Lele Liu Ping wang yimeng wang Weiming Li Min Xu Haoyan Xue School of Materials and Chemical Engineering Xi'an Technological University

Through independently developed stress-loading equipment, stress corrosion tests on Mg-Gd-Y alloy were conducted in a 3.5 wt% NaCl solution. The effects of plastic compressive stress on the corrosion behavior of the alloy were thoroughly investigated using scanning electron microscopy（SEM） and transmission electron microscopy（TEM） among other microscopic analysis techniques. The results indicate that the alloy mainly consists of a-Mg grains, Mg24Y5phase, Mg5Gd phase, and LPSO phase. The corrosion behavior of the Mg-Gd-Y alloy is significantly influenced by the microstructure of the interface between the precipitates and the matrix, the potential difference, and the stress state. In the unstressed state, the Mg24Y5phase first induces corrosion at the edges of the a-Mg grain boundaries, which then spreads internally. Upon the application of plastic stress, the corrosion-inducing capability of the LPSO phase on a-Mg grains notably increases. This discovery provides new insights into the mechanisms by which plastic compressive stress affects the corrosion behavior of Mg-Gd-Y alloys and offers an important basis for the theoretical research and anti-corrosion design in the engineering applications of this alloy.

关键词： Plastic compressive stress Mg-Gd-Y alloy Precipitate phases LPSO Corrosion induction mechanisms Rare earths

Pore-pressure and stress-coupled creep behavior in deep coal:Insights from real-time NMR analysis

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International Journal of Mining Science and Technology 2024年第1期34卷 77-90页

作者： Wenhao Jia Hongwei Zhou Senlin Xie yimeng wang Xinfeng Hu Lei Zhang School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China College of Safety and Emergency Management Engineering Taiyuan University of TechnologyTaiyuan 030024China

Understanding the variations in microscopic pore-fracture structures(MPFS) during coal creep under pore pressure and stress coupling is crucial for coal mining and effective gas treatment. In this manuscript, a triaxial creep test on deep coal at various pore pressures using a test system that combines in-situ mechanical loading with real-time nuclear magnetic resonance(NMR) detection was ***-scale quantitative characterization, online real-time detection, and visualization of MPFS during coal creep influenced by pore pressure and stress coupling were performed using NMR and NMR imaging(NMRI) techniques. The results revealed that seepage pores and microfractures(SPM) undergo the most significant changes during coal creep, with creep failure gradually expanding from dense primary pore fractures. Pore pressure presence promotes MPFS development primarily by inhibiting SPM compression and encouraging adsorption pores(AP) to evolve into SPM. Coal enters the accelerated creep stage earlier at lower stress levels, resulting in more pronounced creep deformation. The connection between the micro and macro values was established, demonstrating that increased porosity at different pore pressures leads to a negative exponential decay of the viscosity coefficient. The Newton dashpot in the ideal viscoplastic body and the Burgers model was improved using NMR experimental results, and a creep model that considers pore pressure and stress coupling using variable-order fractional operators was developed. The model’s reasonableness was confirmed using creep experimental data. The damagestate adjustment factors ω and β were identified through a parameter sensitivity analysis to characterize the effect of pore pressure and stress coupling on the creep damage characteristics(size and degree of difficulty) of coal.

关键词： Real-time monitoring Pore pressure-stress coupling Microscopic pore-fracture structure Variable-order fractional creep model Deep coal

Photocatalytic degradation of tetracycline hydrochloride with visible light-responsive bismuth tungstate/conjugated microporous polymer

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Chinese Journal of Chemical Engineering 2022年第1期35卷 488-496页

作者： Fenghongkang Pan yimeng wang Kaiqing Zhao Jun Hu Honglai Liu Ying Hu State Key Laboratory of Chemical Engineering and School of Chemistry&Molecular Engineering East China University of Science and TechnologyShanghai 200237China Prinbury Biopharm Co. LtdShanghai 201203China

Conjugated microporous polymer(CMP)is an emerging organic semiconductor withπ-conjugated skeletons,and the bandgap of CMP can be flexibly modulated to harvest visible *** on the diversity and adjustability of monomers in CMP,we designed and synthesized donor-accepter(D-A)type BTNCMP through Sonogashira-Hagihara cross-coupling polymerization,further in-situ constructing series of inorganic/organic Z-scheme BW/BTN-n composite in the presence of Bi_(2)WO_(6).After optimization,the tetracycline hydrochloride(C0=10 mg·L^(-1))degradation efficiency reached 84%with BW/BTN-2 as catalyst in 90 min under visible light irradiation,the apparent rate constant k1 is 0.017 min^(-1),which is 1.7 and 5.7 times higher than bare Bi_(2)WO_(6) and BTN-CMP.X-ray photoelectron spectra and UV-Vis diffuse spectra showed that the enhanced photocatalytic activity originated from the tight heterojunction between Bi_(2)WO_(6) and BTN-CMP,which can extend the light absorption range and facilitate the separation and transport of photogenerated charges in the interface of *** active species trapping experiments and electron spin resonance technique revealed that h+was the dominant active species during the photodegradation process of tetracycline hydrochloride(TCH).The present study demonstrated the feasibility to construct inorganic/organic composite for the photocatalytic degradation of environmental pollutants.

关键词： Photochemistry Degradation Visible light response Pollution Inorganic/organic heterojunction composite

Design and Manufacture of Bionic Porous Titanium Alloy Spinal Implant Based on Selective Laser Melting(SLM)

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Computer Modeling in Engineering & Sciences 2020年第9期124卷 1099-1117页

作者： Xiaojun Chen Di wang Wenhao Dou yimeng wang Yongqiang Yang Jianhua wang Jie Chen School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China Hospital of Orthopedics Guangzhou General Hospital of Guangzhou Military CommandGuangzhou510010China

In order to meet the clinical requirements of spine surgery,this paper proposed the exploratory research of computer-aided design and selective laser melting(SLM)fabrication of a bionic porous titanium spine *** structural design of the spinal implant is based on CT scanning data to ensure correct matching,and the mechanical properties of the implant are verified by simulation analysis and laser selective melting *** surface roughness of the spinal implant manufactured by SLM without post-processing is Ra 15μm,and the implant is precisely jointed with the photosensitive resin model of the upper and lower *** surface micro-hardness of the implant is HV 373,tensile strengthσ_(b)=1238.7 MPa,yield strengthσ_(0.2)=1043.9 MPa,the elongation is 6.43%,and the compressive strength of porous structure under 84.60%porosity is 184.09 MPa,which can meet the requirements of the reconstruction of stable *** with the traditional implant and intervertebral fusion cage,the bionic porous spinal implant has the advantages of accurate fit,porous bionic structure and recovery of patients,and the ion release experiment proved that implants manufactured by SLM are more suitable for clinical application after certain *** elastic modulus of the sample is improved after heat treatment,mainly because the microstructure of the sample changes fromα’phase toα+βdual-phase after heat *** addition,the design of high-quality bionic porous spinal implants still needs to be optimized for the actual needs of doctors.

关键词： Selective laser melting(SLM) titanium spinal implant bionic porous

Direct growth of Fe3O4-MoO2 hybrid nanofilm anode with enhanced electrochemical performance in neutral aqueous electrolyte

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Progress in Natural Science:Materials International 2016年第3期26卷 258-263页

作者： Ruizhi Li Xin Ba yimeng wang Wenhua Zuo Chong wang Yuanyuan Li Jinping Liu School of Chemistry Chemical Engineering and Life Science and State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology Institute of Nanoscience and Nanotechnology Department of Physics Central China Normal University School of Optical and Electronic Information Huazhong University of Science and Technology

To enhance the electrochemical energy storage performance of supercapacitors（SCs）, the current researches are general directed towards the cathode materials. However, the anode materials are relatively less studied. In the present work, Fe3O4-MoO2（FO-MO） hybrid nano thin film directly grown on Ti substrate is investigated, which is used as high-performance anode material for SCs in Li2SO4electrolyte with the comparison to pristine Fe3O4nanorod array. The areal capacitance of FO-MO hybrid electrode was initially found to be 65.0 m F cm-2at 2 m Vs-1and continuously increased to 260.0% after 50 cycles of activation. The capacitance values were considerably comparable or higher than many reported thinfilm iron oxide-based anodes in neutral electrolyte. With the protection of MoO2shell, the FO-MO electrode developed in this study also exhibited excellent cyclic stability（increased to 230.8% after 1000cycles）. This work presents a promising way to improve the electrochemical performance of iron oxidebased anodes for SCs.

关键词： Magnetite MoO2 Supercapacitor Binder-free anode Hybridization

Spatio-temporal evolution of pore and fracture structures in coal induced by initial damage and creep behavior:A real-time NMR-based approach

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International Journal of Mining Science and Technology 2024年第10期34卷 1409-1425页

作者： Lei Zhang yimeng wang Mingzhong Gao Wenhao Jia Senlin Xie Wei Hou Xiangyu wang Hao Zhang College of Safety&Emergency Management Engineering Taiyuan University of TechnologyTaiyuan 030024China School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Shenzhen UniversityShenzhen 518060China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Applied Science Taiyuan University of Science and TechnologyTaiyuan 030024China

Understanding the impact of mining disturbances and creep deformation on the macroscopic deformation and the microscopic pore and fracture structures(MPFS)of coal is paramount for ensuring the secure extraction of coal *** study conducts cyclic loading-unloading and creep experiments on coal using a low-field nuclear magnetic resonance(NMR)experimental apparatus which is equipped with mechanical loading units,enabling real-time monitoring the *** experiments indicated that cyclic loading-unloading stress paths initiate internal damage within coal *** identical creep stress conditions,coal samples with more initial damages had more substantial instantaneous deformation and creep deformation during the creep *** undergoing nearly 35 h of staged creep,the total strains for coal samples CC01,CC02,and CC03 reach 2.160%,2.261%,and 2.282%,*** the creep stage,the peak area ratio of seepage pores and microfractures(SPM)gradually diminishes.A higher degree of initial damage leads to a more pronounced compaction trend in the SPM of coal *** the porosity evolution of SPM during the creep process,this study proposes a novel fractional derivative model for the porosity evolution of *** efficacy of the proposed model in predicting porosity evolution of SPM is substantiated through experimental ***,an analysis of the impact mechanisms on key parameters in the model was carried out.

关键词： Coal Microscopic pore and fracture structures Initial damage Creep behavior Fractional porosity model of seepage pores and microfractures Nuclear magnetic resonance

Current observation and analysis based on mooring systems in the Andaman Sea

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Journal of Oceanology and Limnology 2024年第2期42卷 484-491页

作者： yimeng wang Jingsong GUO Dapeng QU Zhixin ZHANG Chalermrat SANGMANEE Varintha VASINAMEKHIN Binghuo GUO First Institute of Oceanography and Key Laboratory of Marine Science and Numerical ModelingMinistry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Shandong Key Laboratory of Marine Science and Numerical Modeling Qingdao 266061China Phuket Marine Biological Center Department of Marine and Coastal ResourcesPhuket 83000Thailand Marine and Coastal Resources Research&Development Institute Department of Marine and Coastal ResourcesBangkok 10210Thailand

The basic structure and intraseasonal evolution of currents in the southeastern Andaman Sea was analyzed based on data collected in 2017 from two subsurface moorings(C1 and C5).Periodic variation in the upper ocean currents of the Andaman Sea was investigated by combining observational and satellite *** observations show that rapid changes of current speed and direction occurred in May and June,with a significant increase in current velocity at the C1 *** the second half of the year,southward flow dominated at the C1 mooring,and alternating northward and southward flows were evident at the C5 mooring during the same period but the northward flow prevailed in boreal *** addition,analysis of the power spectra of the upper currents revealed that the tidal period at both moorings is primarily semidiurnal with weaker energy than that of the low-frequency *** upper ocean currents at the C1 and C5 moorings exhibited intraseasonal variation of 30-60 d and 120 d,while the zonal current at the C1 mooring exhibited a notable period of approximately 180 *** analysis indicated that the variability of currents in the Andaman Sea is influenced primarily by equatorial Kelvin waves and Rossby wave ***,our results suggest that equatorial Kelvin waves from the eastern Indian Ocean entered the Andaman Sea in the form of Wyrtki Jets and propagated primarily along two distinct pathways during the observation *** addition to coastal boundary Kelvin waves,it was found that a branch of the Wyrtki Jet that directly enters the Andaman Sea and flows northward along the slope of the continental shelf,and reflected Rossby wave packets by topography.

关键词： mooring observation Wyrtki Jet Rossby waves intraseasonal variation

Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth

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International Journal of Mining Science and Technology 2023年第11期33卷 1339-1350页

作者： Hongwei Zhou Mingyuan Lu Heping Xie Wenhao Jia Ruidong Peng yimeng wang Bocen Chen Pengfei Jing School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen 518060China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock *** investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and reconstruction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and nonuniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ *** results are compared with existing experimental data to validate the models and calibrate the numerical *** extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are *** influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is *** results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruction methods on the elastic modulus of conventional cores at different *** in-situ pore pressurepreserved test exhibits lower peak stress and peak strain compared to the other three tests,and sandstone subjected to non-uniform pore pressure is more prone to plastic damage and ***,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth.

关键词： In-situ pore pressure-preserved environment Numerical simulation approach Deep in-situ rock mechanics In-situ stress restoration and reconstruction