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Controllable substitutional vanadium doping in wafer-scale molybdenum disulfide films

Nano Research 2023年第2期16卷 3415-3421页

作者： Jihyung Seo Eunbin Son Jiha Kim Sun-Woo Kim Jeong Min Baik Hyesung Park Department of Materials Science and Engineering Graduate School of Semiconductor Materials and Devices EngineeringGraduate School of Carbon NeutralityLow Dimensional Carbon Materials CenterUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea SKKU Institute of Energy Science and Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea

Substitutional atomic doping of transition metal dichalcogenides(TMDs)in the chemical vapor deposition(CVD)process is a promising and effective strategy for modifying their physicochemical ***,the conventional CVD method only allows narrow-range modulation of the dopant concentration owing to the low reactivity of the ***,the growth of wafer-scale monolayer TMD films with high dopant concentrations is much more ***,we report a facile doping approach based on liquid precursor-mediated CVD process for achieving high vanadium(V)doping in the MoS_(2)lattice with excellent doping uniformity and *** lateral growth of the host MoS_(2)lattice and the reactivity of the V precursor were simultaneously improved by introducing an alkali metal halide as a reaction *** metal halide promoter enabled the wafer-scale synthesis of V-incorporated MoS_(2)monolayer film with excessively high doping *** excellent wafer-scale uniformity of the highly V-doped MoS_(2)film was confirmed through a series of microscopic,spectroscopic,and electrical analyses.

关键词： doping concentration reaction promoter substitutional doping transition metal dichalcogenides wafer-scale growth

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Boosting the catalytic activity toward oxygen reduction via a heterostructure of porous iron oxide-decorated 2D NiO/NG nanosheets

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Journal of Energy Chemistry 2024年第6期93卷 669-681,I0016页

作者： Kakali Maiti Matthew T.Curnan Hyung Jun Kim Kyeounghak Kim Jeong Woo Han Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)PohangGyeongbuk 37673Republic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Department of Chemical Engineering Clean-Energy Research InstituteHanyang UniversitySeoul 04763Republic of Korea CSIR-Institute of Minerals and Materials Technology RRL CampusAcharya ViharBhubaneswarOdisha 751013India

As a noble metal substitute,two-dimensional(2D)hierarchical nano-frame structures have attracted great interest as candidate catalysts due to their remarkable advantages-high intrinsic activity,high electron mobility,and straightforward surface ***,they may replace Pt-based catalysts in oxygen reduction reaction(ORR)***,a simple method is developed to design hierarchical nano-frame structures assembled via 2D NiO and N-doped graphene(NG)*** procedure can yield nanostructures that satisfy the criteria correlated with improved electrocatalytic performance,such as large surface area,numerous undercoordinated atoms,and high defect ***,porous NG nanosheet architectures,featuring NiO nanosheets densely coordinated with accessible holey Fe_(2)O_(3) moieties,can enhance mesoporosity and balance *** improvements can facilitate charge transport and expose formerly inaccessible reaction sites,maximizing active site density *** functional theory(DFT)calculations reveal favored O_(2) adsorption and dissociation on Fe_(2)O_(3) hybrid structures when supported by 2D NiO and NG nanomaterials,given 2D materials donated charge to Fe_(2)O_(3) active *** systematic studies reveal that synergistic contributions are responsible for enriching the catalytic activity of Fe_(2)O_(3)@NiO/NG in alkaline media-encompassing internal voids and pores,unique hierarchical support structures,and concentrated N-dopant and bimetallic atomic ***,this work expands the toolbox for designing and synthesizing highly efficient 2D/2D shelled functional nanomaterials with transition metals,endeavoring to benefit energy conversion and related ORR applications.

关键词： N-doped graphene Holey Fe_(2)O_(3)nanocrystals NiO nanosheets High catalytic performance ORR

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Tailored BiVO_(4)/In_(2)O_(3)nanostructures with boosted charge separation ability toward unassisted water splitting

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Carbon Energy 2023年第6期5卷 45-59页

作者： Mi Gyoung Lee Jin Wook Yang Ik Jae Park Tae Hyung Lee Hoonkee Park Woo Seok Cheon Sol ALee Hyungsoo Lee Su Geun Ji Jun Min Suh Jooho Moon Jin Young Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Country Department of Applied Physics Sookmyung Women's UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Yonsei UniversitySeoulRepublic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwonRepublic of Korea

The development of new heterostructures with high photoactivity is a breakthrough for the limitation of solar-driven water ***,we first introduce indium oxide(In_(2)O_(3))nanorods(NRs)as a novel electron transport layer for bismuth vanadate(BiVO_(4))with a short charge diffusion ***_(2)O_(3)NRs reinforce the electron transport and hole blocking of BiVO_(4),surpassing the state-of-the-art photoelectrochemical performances of BiVO_(4)-based ***,a tannin-nickel-iron complex(TANF)is used as an oxygen evolution catalyst to speed up the reaction *** final TANF/BiVO_(4)/In_(2)O_(3)NR photoanode generates photocurrent densities of 7.1 mAcm^(−2) in sulfite oxidation and 4.2 mA cm^(−2) in water oxidation at 1.23 V versus the reversible hydrogen ***,the“artificial leaf,”which is a tandem cell with a perovskite/silicon solar cell,shows a solar-to-hydrogen conversion efficiency of 6.2%for unbiased solar water *** reveal significant advances in the photoactivity of TANF/BiVO_(4)/In_(2)O_(3)NRs from the tailored nanostructure and band structure for charge dynamics.

关键词： bismuth vanadate heterojunction indium oxide nanostructure photoelectrochemical water splitting

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Strain-magnetization property of Ni-Mn-Ga(Co,Cu) microwires

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Rare Metals 2023年第1期42卷 244-253页

作者： Zhi-Yi Ding Jia-Jie Gao Zeng-Bao Jiao Hong-Hui Wu Ai-Ying Chen Jie Zhu State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China School of Materials Science and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong999077China School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China

Magnetization associated with reversible phase transformation or rearrangement of martensite variants of two kinds of shape memory alloys under the coupling of tensile stress were *** is the austenitic Ni_(46)Mn_(28)Ga_(20)Co_(3)Cu_(3)micro wire with the [001] preferred orientation,which exhibits enhanced cyclic stability and large fully recoverable strain(> 8%) due to the stress-induced reversible martensitic transformation at room *** other is the Ni_(54)Mn_(24)Ga_(22)microwire with ferromagnetic martensitic phase,which has preferential orientation and also exhibits large tensile *** on the improved mechanical properties,the strain-magnetization effect of the two kinds of microwire under the coupling of orthogonal magnetic field and tensile stress was performed and the results indicate that the magnetization decreases with the increase of tensile ***,the magnetization mechanism related to the magnetostructural evolution under stress-magnetic coupling was *** study provides a new way for smart magnetic microwires for novel non-contact and non-destructive detection.

关键词： Ni-Mn-Ga Magnetic shape memory alloy Strain-magnetization effect Superelasticity Martensitic transformation

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Axon-like aligned conductive CNT/GelMA hydrogel fibers combined with electrical stimulation for spinal cord injury recovery

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Bioactive materials 2024年第5期35卷 534-548页

作者： Shenglian Yao Yongdong Yang Chenyu Li Kaitan Yang Xin Song Chuanhong Li Zheng Cao He Zhao Xing Yu Xiumei Wang Lu-Ning Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Department of Orthopedics Dongzhimen HospitalBeijing University of Chinese Medicine5 Hai Yun CangBeijing100700China

Rehabilitation and regenerative medicine are two promising approaches for spinal cord injury(SCI)recovery,but their combination has been *** biomaterials could bridge regenerative scaffolds with electrical stimulation by inducing axon regeneration and supporting physiological electrical signal ***,we developed aligned conductive hydrogel fibers by incorporating carbon nanotubes(CNTs)into methacrylate acylated gelatin(GelMA)hydrogel via rotating liquid bath *** electrospun CNT/GelMA hydrogel fibers mimicked the micro-scale aligned structure,conductivity,and soft mechanical properties of neural *** in vitro studies,CNT/GelMA hydrogel fibers supported PC12 cell proliferation and aligned adhesion,which was enhanced by electrical stimulation(ES).Similarly,the combination of aligned CNT/GelMA hydrogel fibers and ES promoted neuronal differentiation and axon-like neurite sprouting in neural stem cells(NSCs).Furthermore,CNT/GelMA hydrogel fibers were transplanted into a T9 transection rat spinal cord injury model for in vivo *** results showed that the incorporating CNTs could remain at the injury site with the GelMA fibers biodegraded and improve the conductivity of regenerative *** aligned structure of the hydrogel could induce the neural fibers regeneration,and the ES enhanced the remyelination and axonal *** assessments and electrophysiological results suggest that the combination of aligned CNT/GelMA hydrogel fibers and ES could significantly restore motor function in *** study demonstrates that conductive aligned CNT/GelMA hydrogel fibers can not only induce neural regeneration as a scaffold but also support ESto promote spinal cord injury *** conductive hydrogel fibers enable merging regenerative medicine and rehabilitation,showing great potential for satisfactory locomotor recovery after SCI.

关键词： Conductive hydrogel fibers CNT/GelMA Electrical stimulation NSCs differentiation Spinal cord injury

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Fabrication of a turbine disk alloy by electron beam sheet lamination and investigation on the improved high temperature creep performance

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Journal of materials science & technology 2023年第12期143卷 216-233页

作者： Xiaogang You Yi Tan Masao Takeyama Pengting Li Yi Li Huixing Zhang Hongyang Cui Chuanyong Cui Yinong Wang Jiayan Li Zhijun Zhang Gengyi Dong Wenjia Xiao Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationSchool of Materials Science and EngineeringDalian 116024China Department of Materials Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of TechnologyJapan Shi-changxu Innovation Center for Advanced Materials Chinese Academy of SciencesInstitute of Metal ResearchShenyang 110016China Department of Materials Engineering The University of British ColumbiaVancouverCanada School of Mechatronics Engineering and Automation Foshan UniversityFoshan 528225China

A turbine disk alloy was prepared by electron beam sheet lamination(EBSL),giving a refined microstruc-ture and high purity,and the microstructure-property relationship of this alloy has been *** alloy showed an outstanding creep life of 1266.3 h at 953 K/500 *** with the conventional vacuum induction melted and vacuum arc re-melted alloy,a smaller dendrite arm spacing of less than 23μm was obtained through the EBSL method,which restricted the formation of large inter-dendritic *** a result,the typical intergranular failure mode was observed in the EBSL alloy,whereas the transgranular fracture mode was dominant in the conventional *** inter-dendritic MC carbides formed from the reverse diffusion of Nb are believed to either impede grain boundary sliding or initi-ate cracks,depending on their size and *** tiny grain boundary precipitates of theδphase in the EBSL alloy could reduce the critical stress for microvoid nucleation to 161.07 MPa by decoher-ing the particle/matrix interface,or allowing vacancy condensation near theδinterface,resulting in the formation of grain boundary *** the conventional alloy,however,the larger-sized MC car-bides which were formed during the solidification process(0.36 vol.%)nucleated the microcracks within the particles,leading to the transgranular ***,the results indicated that the nanoscaleγ′andγ″precipitates contributed primarily to strengthening and coordinating intragranular deforma-tion during creep,in which the Orowan mechanism and shearing of a/6<211>partial dislocations and a/2<110>doublets were active forγ′andγ″precipitates,respectively.

关键词： Electron beam Superalloy Segregation Deformation Precipitation

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Topochemical polymerization of hydrogen-bonded organic framework for supporting ultrafine palladium nanoparticles

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science China Chemistry 2023年第7期66卷 2019-2027页

作者： Xu Ding Bin Han Baoqiu Yu Hailong Wang Jianzhuang Jiang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Topochemical polymerization of molecular crystals into porous materials is of significance due to their promising applications in the field of adsorption and catalysis,yet rarely reported due to the synthesis ***,a hydrogen-bonded organic framework(HOF-45)has been fabricated by the crystallization of a cage-like building block containing three alkynyl *** exhibits almost mesoporous structure demonstrated by single crystal X-ray diffraction ***-driven topochemical polymerization of HOF-45 with ethanedithiol covalently links alkynyl groups in HOF-45,generating a hydrogen-bond and covalentbond cross-linked material(HOF-45C).In contrast to HOF-45,cross-linked HOF-45C retains the crystalline nature and displays improved solution resistence according to the powder X-ray diffraction *** particular,HOF-45C is able to support the growth of ultrafine palladium nanoparticles with the average size of ca.1.9 nm for rapidly promoting the degradation of nitrophenol,methyl orange,and congo red with the help of NaBH_(4)as well as Suzuki-Miyaura coupling *** work inputs a new idea on the HOFs application in preparing covalent-linked porous organic materials.

关键词： hydrogen-bonded organic frameworks topochemical polymerization palladium nanoparticles nitrophenol degradation organic dyes degradation Suzuki-Miyaura coupling reaction

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Microstructures and micromechanical behaviors of high -entropy alloys investigated by synchrotron X-ray and neutron diffraction techniques: A review

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International Journal of Minerals,Metallurgy and materials 2024年第6期31卷 1333-1349页

作者： Yubo Huang Ning Xu Huaile Lu Yang Ren Shilei Li Yandong Wang Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China AnSteel Beijing Research Institute Co.Ltd. Beijing 102200China Spallation Neutron Source Science Center Dongguan 523803China Department of Physics City University of Hong KongHong Kong 999077China Institute for Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

High-entropy alloys(HEAs)possess outstanding features such as corrosion resistance,irradiation resistance,and good mechan-ical properties.A few HEAs have found applications in the fields of aerospace and *** studies on the deformation mech-anisms of HEAs can guide microstructure control and toughness design,which is vital for understanding and studying state-of-the-art structural *** X-ray and neutron diffraction are necessary techniques for materials science research,especially for in situ coupling of physical/chemical fields and for resolving macro/microcrystallographic information on ***,several re-searchers have applied synchrotron X-ray and neutron diffraction methods to study the deformation mechanisms,phase transformations,stress behaviors,and in situ processes of HEAs,such as variable-temperature,high-pressure,and hydrogenation *** this review,the principles and development of synchrotron X-ray and neutron diffraction are presented,and their applications in the deformation mechanisms of HEAs are *** factors that influence the deformation mechanisms of HEAs are also *** review fo-cuses on the microstructures and micromechanical behaviors during tension/compression or creep/fatigue deformation and the application of synchrotron X-ray and neutron diffraction methods to the characterization of dislocations,stacking faults,twins,phases,and intergrain/interphase stress *** on future developments of synchrotron X-ray and neutron diffraction and on research directions on the deformation mechanisms of novel metals are discussed.

关键词： high-entropy alloys microstructures micromechanical behaviors synchrotron X-ray diffraction neutron diffraction

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In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation

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Rare Metals 2024年第4期43卷 1557-1569页

作者： Shao-Fei Zhang Xiao-Lu Yin Jin Wang Jian-Li Kang Tian-Tian Li Jin-Feng Sun Yong-Qiang Meng Jian-Jiang Wang Dian-Long Wang Kai-Qiang Qin Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018China Key Laboratory of Advanced Ceramics and Machining Technology/Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China Electrochemical Engine Center Department of Mechanical EngineeringPennsylvania State UniversityUniversity ParkPA16802USA

Heterogeneous interfaces produced by interdomain interactions on a nanoscale performs a crucial role in boosting the properties of an electrocatalyst toward oxygen evolution reaction(OER)***,a series of dual-phase electrodes with intimately connected heterointerfaces are prepared by in situ decomposing solid solution oxide of Ni_(x)Co_(y)Fe_(100-x-y)O,which grew on Ni foam massively via an ultrafast combustion ***,with high-reaction kinetics caused by the reduction treatment at 450℃,the less electronegative Fe and Co are more oxyphilic than Ni,which facilitated their co-exsolution and formation of CoFe_2O_4/NiO oxide with enriched oxygen *** from the nanoporous framework,heterojunction structure,and oxygen defects,the self-supporting electrodes present rapid charge/mass transmission and provide abundant active sites for *** optimized sample(R-SNCF4.5)shows low overpotentials of 226 and 324 mV at 10 and100 mA·cm^(-2),a small Tafel slope(46.7 mV·dec^(-1)),and excellent *** assembled R-SNCF4.5//Pt/C/NF electrolyzer demonstrates continuous electrolysis over 50 h at a current density of 10 mA·cm^(-2),under 1.51 *** functional theory(DFT)calculations verify that the strong electronic modulation plays a critical part in the CoFe_2O_4/NiO hybrid by lowering the energy barriers for the ratedetermining steps,and Fe sites are the most active OER sites.

关键词： Rapid combustion Decomposition of solid solution oxide Dual-phase heterostructure Oxygen evolution reaction Theoretical calculation

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Atomic-scale simulations in multi-component alloys and compounds:A review on advances in interatomic potential

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Journal of materials science & technology 2023年第34期165卷 49-65页

作者： Feiyang Wang Hong-Hui Wu Linshuo Dong Guangfei Pan Xiaoye Zhou Shuize Wang Ruiqiang Guo Guilin Wu Junheng Gao Fu-Zhi Dai Xinping Mao Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering Shenzhen MSU-BIT UniversityShenzhen 518172China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Thermal Science Research Center Shandong Institute of Advanced TechnologyJinan 250103China AI for Science Institute Beijing 100084China DP Technology Beijing 100080China

Multi-component alloys have demonstrated excellent performance in various applications,but the vast range of possible compositions and microstructures makes it challenging to identify optimized alloys for specific *** overcome this challenge,large-scale atomic simulation techniques have been widely used for the design and optimization of multi-component *** capability and reliability of large-scale atomic simulations essentially rely on the quality of interatomic potentials that describe the interactions between *** work provides a comprehensive summary of the latest advances in atomic simulation techniques for multi-component *** focus is on interatomic potentials,including both conventional empirical potentials and newly developed machine learning potentials(MLPs).The fitting processes for different types of interatomic potentials applied to multi-component alloys are also ***,the challenges and future perspectives in developing MLPs are thoroughly ***,this review provides a valuable resource for researchers interested in developing optimized multicomponent alloys using atomic simulation techniques.

关键词： Multi-component alloys Atomic simulation Empirical potentials Machine learning potentials

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