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材料科学技术（英文版）
材料科学技术（英文版）

胡壮麟

月刊

1005-0302

jmst@imr.ac.cn

024-83978208

110016

沈阳市沈河区文化路72号

材料科学技术（英文版）/Journal Journal of Materials Science & TechnologyCSCDCSTPCD北大核心EISCI
查看更多>>本刊简称《JMST》，（ISSN 1005-0302，CN 21-1315/TG）。1985年创刊。是中国科协主管，中国金属学会，中国材料研究学会和中国科学院金属研究所联合主办的国际性英文期刊，以“加强国际交流，扩大学术影响，服务经济建设”为办刊宗旨，刊登世界各国的具有创新性和较高学术水平的原始性论文，并设有物约综述、快报、简讯及国内外材料界杰出学者简介等栏目，内容包括金属材料、无机非金属材料、复合材料及有机高分子材料等。
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    Selective solar-driven CO2 reduction mediated by 2D/2D Bi2O2SiO3/MXene nanosheets heterojunction

    Kai WangQuanpeng WangKaijia ZhangGuohong Wang...
    202-208页
    查看更多>>摘要：Photocatalytic CO2 reduction reaction(CO2RR)is an environment-friendly technique for clean fuel genera-tion.Developing low-cost and efficient photocatalyst/cocatalyst systems for boosting CO2RR is still a chal-lenge.Herein,a novel Bi2O2SiO3/Ti3C2 2D/2D heterojunction photocatalysts are successfully prepared by in situ growth of Bi2O2SiO3 on the surface of ultrathin Ti3C2 nanosheets,a kind of MXenes.The observed Bi2O2SiO3/Ti3C2(BOSO/TC-2)hybrids exhibit a large interface contact area companied with enhanced CO2 adsorption capability,illustrating excellent 2D/2D interfacial charge transfer behaviors.The total yield of products obtained on the optimized BOSO/TC-2 photocatalyst is 3.8 times that of pristine Bi2O2SiO3 nanosheets and achieve near 90％selectivity for CO over CH3OH without sacrificial agents,which was higher than most all inorganic Bi-based photocatalysts.Moreover,the mechanism of enhanced photocat-alytic activity and reaction pathway was proposed in terms of the DFT study and in situ FTIR analysis.This work might provide new semiconductor/cocatalyst systems for selective CO2 photoreduction to solar fuels.
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    Photodeposition of CoOx and MoS2 on CdS as dual cocatalysts for photocatalytic H2 production

    Tingmin DiQuanrong DengGeming WangShenggao Wang...
    209-216页
    查看更多>>摘要：Photocatalytic H2 production from water splitting has a promising prospect for alleviating energy and environmental issues.However,the fast recombination of photogenerated charge carriers limits the pho-tocatalytic efficiency and its practical application.Cocatalyst engineering is an effective strategy to spa-tially separate photogenerated charge carriers.In this work,noble-metal-free MOS2 and CoOx cocatalysts are loaded on CdS nanorods by a two-step photodeposition method.The MoS2 functions as the reduc-tion cocatalyst to trap electrons and CoOx as the oxidation cocatalyst to trap holes.Transmission electron microscopy(TEM),inductively coupled plasma(ICP),X-ray photoelectron spectroscopy(XPS)and Mott-Schottky results demonstrate the effectiveness of photodeposition for loading MOS2 and CoOx dual cocata-lysts on CdS and their impact on the photochemical properties.The optimized CdS-MoS2-CoOx composite exhibits a high photocatalytic H2-production rate of 7.4 mmol g-1 h-1 and an apparent quantum effi-ciency(QE)of 7.6％at 420 nm.Further analysis on time-resolved photoluminescence(TRPL)indicates that the introduction of dual cocatalysts greatly prolongs the lifetime of photogenerated charge carriers and deceases the charge recombination rates,consequently leading to superior photocatalytic H2-production performance.This work provides a facile and effective strategy for the construction of highly efficient dual-cocatalyst-modified CdS photocatalyst for high-performance photocatalytic H2 production.
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    Martensitic twinning transformation mechanism in a metastable IVB element-based body-centered cubic high-entropy alloy with high strength and high work hardening rate

    Yuhe HuangJunheng GaoVassili VorontsovDikai Guan...
    217-231页
    查看更多>>摘要：Realizing high work hardening and thus elevated strength-ductility synergy are prerequisites for the practical usage of body-centered-cubic high entropy alloys(BCC-HEAs).In this study,we report a novel dynamic strengthening mechanism,martensitic twinning transformation mechanism in a metastable re-fractory element-based BCC-HEA(TiZrHf)87Ta13(at.％)that can profoundly enhance the work hardening capability,leading to a large uniform ductility and high strength simultaneously.Different from con-ventional transformation induced plasticity(TRIP)and twinning induced plasticity(TWIP)strengthen-ing mechanisms,the martensitic twinning transformation strengthening mechanism combines the best characteristics of both TRIP and TWIP strengthening mechanisms,which greatly alleviates the strength-ductility trade-off that ubiquitously observed in BCC structural alloys.Microstructure characterization,carried out using X-ray diffraction(XRD)and electron back-scatter diffraction(EBSD)shows that,upon straining,α"(orthorhombic)martensite transformation,self-accommodation(SA)α"twinning and me-chanical α"twinning were activated sequentially.Transmission electron microscopy(TEM)analyses re-veal that continuous twinning activation is inherited from nucleating mechanical{351}α"type Ⅰ twins within SA"{351}"<(2)11>α"type Ⅱ twinned α"variants on[351}α"twinning plane by twinning transfor-mation through simple shear,thereby accommodating the excessive plastic strain through the twinning shear while concurrently refining the grain structure.Consequently,consistent high work hardening rates of 2-12.5 GPa were achieved during the entire plastic deformation,leading to a high tensile strength of 1.3 GPa and uniform elongation of 24％.Alloy development guidelines for activating such martensitic twinning transformation strengthening mechanism were proposed,which could be important in devel-oping new BCC-HEAs with optimal mechanical performance.
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    Chemically inducing room temperature spin-crossover in double layered magnetic refrigerants Pr1.4+xSr1.6-xMn2O7(0.0≤x≤0.5)

    Akshay KumarKavita KumariMohit K.SharmaAnkush Vij...
    232-242页
    查看更多>>摘要：The height of total entropy(ST)for a magnetic refrigerant material is essentially concerned with the mag-netic and structural transitions.However,the participation of such transitions in layered materials is not well understood.Therefore,the purpose of this work is to investigate the interplay between double layer lattice with their single perovskite counterpart,to achieve optimal magnetocaloric performance.A series of self-doped Pr1.4+xSr1.6-xMn2O7(0.0≤x≤0.5)Ruddlesden-Popper(R-P)perovskite have been prepared through the solid-state sintering method.With increasing the Pr-stoichiometry,the lattice faults have in-creased and the double layer lattice dramatically disintegrates into single perovskite structure.Due to the reduction of bilayer R-P phase into single perovskite the spin crossover occurs from weak bilayer(Tc=304 K)interactions towards the strong three-dimensional(Tc=308 K)interactions respectively.This series consistently develops thermomagnetic irreversibility in zero-field cooled(ZFC)-field cooled(FC)magnetization,which is indicative of a spin-glass state.The glassy nature has been ascribed collec-tively to the lattice strain produced because of dislocations and to an antiferromagnetic phase segregated at the surface.The maximum value of temperature average entropy change(TEC)and adiabatic temper-ature(ΔTad)has enhanced nearly by 4 folds from 0.53 J kg-1 K-1,0.59 K(for x=0.0)up to 1.85 J kg-1 K-1,10 K(for x=0.5)at 2.5 T,respectively.Additionally,the room temperature relative cooling power has improved from 26.94 J/kg up to 77.84 J/kg with an applied field of 2.5 T.Our findings in this work suggest that the controlled reduction of double layer lattice into single perovskite and/or existence of both phases simultaneously in bilayer R-P manganites may be very effective in obtaining the desirable characteristics of magnetocaloric effects.
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    Hydrophobic long alkyl chain organic cations induced 2D/3D heterojunction for efficient and stable perovskite solar cells

    Xiang HeMin WangFengren CaoWei Tian...
    243-251页
    查看更多>>摘要：Designing post-formed two-dimensional(2D)perovskite on the surface of three-dimensional(3D)per-ovskite with matched energy levels and high stability is crucial for improving the performance and sta-bility of perovskite solar cells(PSCs).Herein,a long alkyl chain dodecylammonium bromide(DABr)was applied to react with excessive lead iodide(PbI2)on the grain boundary of metal halide perovskite pref-erentially,forming DA2PbI4(n=1)to constitute a clear 2D/3D heterojunction.The existence of hetero-junction increases the intensity of the built-in electric field of the device to enhance carrier separation and extraction,and the amino group of dodecylammonium cation passivates defects,which jointly con-tribute to the improvement of the power conversion efficiency(PCE)from 20.35 to 21.81％.The long alkyl chain endows the 2D perovskite with good hydrophobic properties,improving the humidity and thermal stability of the device.The unencapsulated device can maintain 64％of its initial efficiency after 1065 h storage in ambient air.
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    Optimal array alignment to deliver high performance in flexible conducting polymer-based thermoelectric devices

    Shengduo XuMeng LiMin HongLei Yang...
    252-259页
    查看更多>>摘要：Flexible thermoelectric devices(F-TEDs)show great potentials to be applied in curved surface for power generation by harvesting low-grade energy from human body and other heat sources.However,their power generation efficiency is constrained by both unsatisfactory constituent materials perfor-mance and immature device design.Here,we used an optimal alignment of vertically-aligned poly(3,4-ethylenedioxythiophene)polystyrene sulfonate(PEDOT:PSS)arrays to assemble a 2.7×3.2 cm2 F-TEDs,exhibiting a maximum power output of 10.5 μW.Such a high performance can be ascribed to the out-standing power factor of 198 μW m-1 K-2 by the synergetic effect of both high charge mobility and optimal oxidation level and the optimized array alignment that maximizes the temperature difference utilization ratio across the TE legs.Particularly,optimized leg distance of 6 mm and leg length of 12 mm are determined to realize a high temperature difference utilization ratio of over 95％and a record-high output power density of 1.21 μW cm-2 under a temperature difference of 30 K.Further,reliable bending(1000 cycles)and stability(240 h)tests indicate the outstanding mechanical robustness and environmen-tal stability of the developed F-TEDs.This study indicates our reasonable device design concept and facile material treatment techniques secure high-performance F-TEDs,serving as a reference for other flexible energy harvesting devices with wide practical applications.
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    Characteristics of β-type Ti-41Nb alloy produced by laser powder bed fusion:Microstructure,mechanical properties and in vitro biocompatibility

    Zhongjie LiJiajun QiuHao XuAnping Dong...
    260-272页
    查看更多>>摘要：Aβ-type Ti-41Nb alloy with high relative density has been successfully fabricated by laser powder bed fusion(L-PBF)using pre-alloyed powders for potential implant application.The homogeneous microstruc-ture can be achieved in L-PBF fabricated(L-PBFed)Ti-41Nb alloy but slight composition segregation was detected along molten pool boundaries.The L-PBFed alloy was dominated by typical epitaxial columnar grains with strong<001>grain orientation along building direction(BD),and cellular structure was dis-tinguished within the columnar grains.The main reasons for this microstructure can be attributed to effective thermal gradient and epitaxial growth.L-PBFed alloy exhibited higher mechanical strength com-pared with cold rolling plus annealing(CRA)alloy due to the finer grains,dislocations accumulation and different TRIP behaviors,accompanied by good ductility.It also exhibited much lower thermal conductiv-ity and better hydrophilic feature than those of CP-Ti.Besides,the L-PBFed alloy exhibited slightly better cell spread and cell proliferation rates compared with CP-Ti.Moreover,L-PBFed alloy presented better alkaline phosphatase(ALP)activities and extracellular matrix(ECM)mineralization,which suggests that the L-PBFed alloy can stimulate the osteogenic differentiation of rat bone mesenchymal stem cells.The Ti-41Nb alloy,fabricated by L-PBF,reveals a good combination of mechanical properties,physicochemical properties and biocompatibility,exhibiting the great potential as the dental implant.
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