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Laser stripping of Ag shell from Au@Ag nanoparticles

Rare Metals 2021年第12期40卷 3454-3459页

作者： De-Zhi Zhu Jian-Feng Yan Zhen-Wei Liang Jia-Wang Xie Hai-Lin Bai Key Laboratory for Advanced Materials Processing Technology Ministry of Education of ChinaState Key Laboratory of TribologyDepartment of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Metallic nanoparticles(NPs)are a class of important materials with widespread applications due to their chemical stability and high photothermal conversion *** is essential to post-control the morphology and structure of metallic NPs for practical *** processing of metallic NPs has been widely *** of previous studies on the reshaping process have been related to the single metallic NPs,and no attempt has been made to separate the components in bimetallic ***,the stripping of Ag shell from Au@Ag NPs based on ultrafast laser excitation was *** experimental work combined spectrum and microscopy analysis showed the structure transformation of Au@Ag *** the electric field simulation,the stripping of the Ag shell may arise from the electric field effect.

关键词： red image Laser stripping of Ag shell from Au@Ag nanoparticles

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A machine learning approach to predict coefficient of friction of laser cladding high-entropy alloy coatings

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Journal of materials Research and technology 2025年 36卷 8240-8253页

作者： Yawen Pan Bingquan Xu Junjun Wang Jian Peng Zhigang Xu Qiang Shen Chuanbin Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Engineering Research Center of Environmental Materials and Membrane Technology of Hubei Province Wuhan Institute of Technology Wuhan 430074 PR China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou Guangdong 521000 PR China

Traditional method for evaluating the coefficient of friction (COF) of laser cladding high-entropy alloy (HEA) coatings, relying on extensive experiments, is costly and inefficient. To address these limitations, this study proposed an efficient machine learning (ML) approach. Random Forest, Gradient Boosting Decision Tree, and XGBoost models were developed as base models to predict the COF of HEA coatings. Feature engineering and a voting strategy were employed to enhance model accuracy and generalization ability, yielding substantial improvements in performance. The optimal model achieved a testing R 2 of 0.97. A satisfactory agreement was achieved between the predicted COFs and the experimental measurements as well as their trend. Additionally, the impact of each feature on the COF was clarified using SHAP (Shapley Additive Explanations). The results indicate that this ML approach is a promising tool for predicting the COF of HEA coatings and can serve as a valuable aid in the design and optimization of coatings.

关键词： High-entropy alloy coating Laser cladding Machine learning Tribology Wear Coefficient of friction

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Locally Off-Centered Ge Atoms Contribute to High Thermoelectric Performance of Globally Averaged Cubic MnGeTe2 Alloys

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SSRN 2024年

作者： Mei, Qicai Xie, Chenghao Cui, Jingjing Liao, Chengyun Li, Songlin Tang, Xinfeng Tan, Gangjian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China International School of Materials Science & Engineering Wuhan University of Technology Wuhan430070 China

Exploring high-performance and environment-benign thermoelectric materials free of phase change during their service is a long-standing challenge. Herein a maximum ZT of 1.4 at 878 K is reported for non-toxic Sb-doped MnGeTe2 alloys with a consistent cubic rock salt structure above room temperature. Pristine MnGeTe2 is a heavily self-doped p-type semiconductor with its hole density (pH) exceeding 1021 cm-3. Due to the strong contribution of localized 3d orbitals from Mn to the valence band maxima lying along the Γ–K direction with a high valley degeneracy of 4 , MnGeTe2 features a superb density of states (DOS) effective mass (m* ~ 10 me), endowing it a large Seebeck coefficient of ~105 μV K-1 at 300 K despite its over high pH. Moreover, Ge atoms are locally discordant in MnGeTe2 and displaced ∼0.33 Å off the octahedron center, inducing soft polar phonons that effectively scatter the heat carrying acoustic phonons and enable a low lattice thermal conductivity (κlat ~0.57 W m-1 K-1 at 871 K). Sb doping not only efficiently neutralizes the excess pH of MnGeTe2 leading to high Seebeck coefficient (> 250 μV K-1), but further drops κlat to ~0.49 W m-1 K-1 by reinforced point defect scattering. Our work highlights the significance of local off-centering atoms in developing high-performance bulk thermoelectric materials. © 2024, The Authors. All rights reserved.

关键词： Germanium alloys

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将硅纳米颗粒限域在多壳层空心球:一种提升循环稳定性的有效策略

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Science China materials 2023年第6期66卷 2199-2206页

作者：杜寰余若翰谭兴念吴劲松赵东元麦立强周亮 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Nanostructure Research Center(NRC) Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory(LZL) Wuhan University of TechnoologyXiangyang 441106China

单质硅是一种有潜力的高容量锂离子电池负极材料.然而,受限于充放电过程中巨大的体积膨胀,其循环性能并不理想.在这个工作中,我们设计了一种独特的三组分复合负极材料(Si/Cr_(2)O_(3)/C),其中Si纳米颗粒被限域在碳包覆的氧化铬多层空心... 详细信息

单质硅是一种有潜力的高容量锂离子电池负极材料.然而,受限于充放电过程中巨大的体积膨胀,其循环性能并不理想.在这个工作中,我们设计了一种独特的三组分复合负极材料(Si/Cr_(2)O_(3)/C),其中Si纳米颗粒被限域在碳包覆的氧化铬多层空心球(MSHSs)中.得益于Cr_(2)O_(3)/C基体的体积变化缓冲能力与优异的结构稳定性,将Si纳米颗粒封装在MSHSs中可以有效地提高其电化学性能.合理的结构设计赋予了Si/Cr_(2)O_(3)/C三组分复合材料高的可逆容量(在100 mA g^(-1)的电流密度下,比容量为1351 mA h g^(-1))和稳定的循环性能(在500 mA g^(-1)的电流密度下,循环300次后比容量保持在716 mA h g^(-1)).这一工作提出了一种多壳层空心结构设计的新思路,以解决硅基负极材料循环性差的瓶颈.

关键词：硅基负极材料充放电过程硅纳米颗粒循环稳定性空心结构电化学性能有效策略空心球

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Site-specific fabrication of gold nanocluster-based fluorescence photoswitch enabled by the dual roles of albumin proteins

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Aggregate 2023年第1期4卷 268-276页

作者： Wencheng Zhong Xiaojian Yan Shaohua Qu Li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’anChina Northwestern Polytechnical University Chongqing Technology Innovation Center ChongqingChina NPU-QMUL Joint Research Institute of Advanced Materials and Structures(JRI-AMAS) Northwestern Polytechnical UniversityXi’anChina

Fluorescence photoswitch is becoming increasingly desirable for many applications,but its controllable fabrication still remains challenging *** this paper,a new strategy is proposed to fabricate fluorescence photoswitch by harnessing dual roles of albumin proteins as both photochrome carriers and biotemplates of *** an example,we demonstrated the successful fabrication of a fluorescence photoswitch by incorporating both the photochromic diarylethene dye(CMTE)and red-emitting fluorescent gold nanoclusters(AuNCs)into the specific domains of bovine serum albumin(BSA)in a highly controllable *** spectral and photophysical characterisation showed that CMTE well-retains the photochromic properties within the CMTE–BSA–AuNC construct,although its photoconversion rate is slightly *** from previously reported photoswitches,the fluorescence of the present system is mainly modulated via the inner filter effect(IFE)mechanism,which exhibits high switching efficiency with an on-off ratio up to 90%,reversible fluorescence response and good antifatigue *** work provides a new,generable albumin protein-assisted strategy of fabricating advanced fluorescence photoswitch,which can find wide applications in biological,optical and information fields.

关键词： albumin protein fluorescence switch gold nanoclusters inner filter effect photochrome

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Significant capacitance enhancement induced by cyclic voltammetry in pine needle-like Ni-Co-Cu multicomponent electrode

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Journal of materials Science & technology 2021年第19期78卷 100-109页

作者： Liqianyun Xu Liuyang Zhang Bei Cheng Jiaguo Yu Ahmed A.Al-Ghamdi S.Wageh State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou.450001China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia

Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor ***,simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably *** discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated *** areal capacitance of the treated sample rockets up to 6.13 F cm^(-2)at 2 m A cm^(-2),almost 13 times higher than the untreated ***,the resistance is substantially reduced by cyclic voltammetry ***,the Coulombic efficiency and stability are concurrently *** reasons behind this treatment are mulled over and reasonable hypothesis is *** study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials.

关键词： Cyclic voltammetry Ni-Co-Cu ternary composite Ion exchange Supercapacitor

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A facile approach to fabricating graphene/waterborne epoxy coatings with dual functionalities of barrier and corrosion inhibitor

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Journal of materials Science & technology 2022年第17期112卷 263-276页

作者： Suyun Liu Xuewan Wang Qi Yin Xiongzhi Xiang Xian-Zhu Fu Xian-Zong Wang Jing-Li Luo Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China

A facile and environmentally-friendly method is developed to prepare graphene/waterborne epoxy(WEP)composite *** graphene nanosheets are produced with electrochemical-exfoliation in the solution containing surfactants,cetyl trimethyl ammonium bromide(CTAB)and sodium dodecyl sulfate(SDS).The nanosheets containing solution thus formed are subjected to a quick dialysis and then directly used as a diluent for WEP without any further *** preparation method overcomes the commonly identified problems of aggregations and‘corrosion promotion’effect associated with graphene,and increases the impedance of the composite coatings by more than two orders of *** analysis of anticorrosion performance suggested that the presence of surfactants not only improves the dispersibility of graphene nanosheets but also endows the composite coatings with both barrier and corrosion inhibition *** strategy reported herein may pave the path to the large-scale production of graphene anticorrosion coatings.

关键词： Electrochemical-exfoliation graphene Waterborne epoxy coatings Anticorrosion Inhibition

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Achieving enhanced thermoelectric and mechanical performance in p-type bismuth telluride through constrained hot deformation

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Ceramics International 2025年

作者： Chen, Quansheng Ji, Chen Yu, Jian Hua, Lin Zhao, Wenyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Jiujiang University Jiujiang332005 China Hubei Key Laboratory of Advanced Technology for Automobile Components Wuhan University of Technology Wuhan430070 China

Bi2Te3-based alloys remain the only commercially available thermoelectric (TE) materials. However, their practical applications are severely constrained by the inferior mechanical performance of the zone melting (ZM) ingot. Herein, a simple constrained hot deformation (CHD) technology was developed to prepare the p-type Bi0.5Sb1.5Te3 polycrystalline materials derived from ZM ingots. It was discovered that the deformation process has negligible impact on the phase composition, but can efficiently refine the grains to approximately 5 μm through the dynamic recrystallization and simultaneously introduce high-density dislocations. Although the donor-like effect induced by deformation would obviously deteriorate the electrical conductivity, the recovery effect triggered by high deformation temperature can effectively optimize the carrier concentration and thus alleviate the degradation of power factor. The material deformed at 773 K maintains a relatively high power factor ∼3.33 mW K−2 m−1 at 300 K, together with a significantly decreased lattice thermal conductivity ∼0.59 W m−1 K−1, and an improved zT ∼1.1 was obtained ultimately. More importantly, the deformed materials show a significant improvement in mechanical performance due to the grain refinement. A maximum average Vickers hardness of 0.67 GPa was achieved for the material deformed at 723 K, which is ∼40 % higher than that of the ZM ingot. Our work indicates the simple CHD is an efficient technology to synergistically enhance both TE and mechanical properties of Bi2Te3-based ZM ingot. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Polycrystalline materials

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Boosting Oxygen Evolution Reaction Performance on NiFe‑Based Catalysts Through d‑Orbital Hybridization

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Nano-Micro Letters 2025年第1期17卷 281-292页

作者： Xing Wang Wei Pi Sheng Hu Haifeng Bao Na Yao Wei Luo State Key Laboratory of New Textile Materials and Advanced Processing Technology Key Laboratory of New Textile Materials and Applications of Hubei ProvinceSchool of Materials Science and EngineeringWuhan Textile UniversityWuhan 430200People’s Republic of China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072People’s Republic of China

Anion-exchange membrane water electrolyzers(AEMWEs)for green hydrogen production have received intensive attention due to their feasibility of using earth-abundant NiFe-based *** introducing a third metal into NiFe-based catalysts to construct asymmetrical M-NiFe units,the d-orbital and electronic structures can be adjusted,which is an important strategy to achieve sufficient oxygen evolution reaction(OER)performance in ***,the ternary NiFeM(M:La,Mo)catalysts featured with distinct M-NiFe units and varying d-orbitals are reported in this *** and theoretical calculation results reveal that the doping of La leads to optimized hybridization between d orbital in NiFeM and 2p in oxygen,resulting in enhanced adsorption strength of oxygen intermediates,and reduced rate-determining step energy barrier,which is responsible for the enhanced OER *** critically,the obtained NiFeLa catalyst only requires 1.58 V to reach 1 A cm^(−2) in an anion exchange membrane electrolyzer and demonstrates excellent long-term stability of up to 600 h.

关键词： NiFe-based catalysts d-orbital coupling Oxygen evolution reaction Anion exchange membrane electrolyzer

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Two-dimensional vanadium carbide for simultaneously tailoring the hydrogen sorption thermodynamics and kinetics of magnesium hydride

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Journal of Magnesium and Alloys 2022年第4期10卷 1051-1065页

作者： Chenglin Lu Haizhen Liu Li Xu Hui Luo Shixuan He Xingqing Duan Xiantun Huang Xinhua Wang Zhiqiang Lan Jin Guo Guangxi Novel Battery Materials Research Center of Engineering Technology Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured MaterialsGuangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related TechnologySchool of Physical Science and TechnologyGuangxi UniversityNanning530004China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co.Ltd.Beijing102209China Department of Materials Science and Engineering Baise CollegeBaise533000GuangxiChina Department of Materials Science and Engineering Zhejiang UniversityHangzhou310027China

Magnesium hydride(MgH_(2))is a potential material for solid-state hydrogen ***,the thermodynamic and kinetic properties are far from practical application in the current *** this work,two-dimensional vanadium carbide(V_(2)C)MXene with layer thickness of 50−100 nm was fist synthesized by selectively HF-etching the Al layers from V_(2)AlC MAX phase and then introduced into MgH_(2) to improve the hydrogen sorption performances of MgH_(2).The onset hydrogen desorption temperature of MgH_(2) with V_(2)C addition is significantly reduced from 318℃ for pure MgH_(2) to 190℃,with a 128℃ reduction of the onset *** MgH_(2)+10 wt%V_(2)C composite can release 6.4 wt%of H_(2) within 10 min at 300℃ and does not loss any capacity for up to 10 *** activation energy for the hydrogen desorption reaction of MgH_(2) with V_(2)C addition was calculated to be 112 kJ mol^(−1) H_(2) by Arrhenius’s equation and 87.6 kJ mol^(−1) H_(2) by Kissinger’s *** hydrogen desorption reaction enthalpy of MgH_(2)+10 wt%V_(2)C was estimated by van’t Hoff equation to be 73.6 kJ mol^(−1) H_(2),which is slightly lower than that of the pure MgH_(2)(77.9 kJ mol^(−1) H_(2)).Microstructure studies by XPS,TEM,and SEM showed that V_(2)C acts as an efficient catalyst for the hydrogen desorption reaction of MgH_(2).The first-principles density functional theory(DFT)calculations demonstrated that the bond length of Mg−H can be reduced from 1.71A for pure MgH_(2) to 2.14A for MgH_(2) with V_(2)C addition,which contributes to the destabilization of MgH_(2).This work provides a method to significantly and simultaneously tailor the hydrogen sorption thermodynamics and kinetics of MgH_(2) by two-dimensional MXene materials.

关键词： Hydrogen storage MgH_(2) V_(2)C Catalyst DFT

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