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Preparation of Co/CoOx Derived from a Lowtemperature Etching of ZIF-67 for Oxygen Reduction and Oxygen Evolution Catalytic Reaction

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Journal of Wuhan University of technology(materials Science) 2023年第6期38卷 1255-1261页

作者： TAN Shifeng TU Wenmao PAN Hongfei ZHANG Haining State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Fuel Cells Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China

Catalysts consisting of Zeolite imidazolyl ester skeleton-67(ZIF-67)and graphene oxide(GO)were fabricated through a solvothermal method,followed by etching ZIF-67 with oxygen-rich functional groups on GO in a reduction atmosphere at 400℃.During this process,an open type of cobalt metal center was formed by the partial vaporization and oxidation of ZIF-67,further reducing to Co and partially combining with oxygen species to amorphous *** from the rich functional N,and metal/oxides active centers derived from the calcination process,the synthesized Co/CoOx@NSG-400 showed a low OER overpotential of 10 mA·cm^(-2) at 298 mV,and an ORR half-wave potential of 0.8 V,which demonstrated its excellent bifunctional catalytic *** a controllable calcination strategy with high yields could be expected to pave the way for synthesizing low-cost and efficient bifunctional electrocatalysts.

关键词： oxygen evolution reaction oxygen reduction reaction bifunctional electrocatalyst ZIF-67

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3D-printable Boron Nitride/Polyacrylic Hydrogel Composites with High Thermal Conductivities

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Journal of Wuhan University of technology(materials Science) 2024年第5期39卷 1303-1310页

作者： DAI Jialei XUE Bingyu QIAN Qi HE Wenhao ZHU Chenglong LEI Liwen WANG Kun XIE Jingjing Hubei Longzhong Laboratory Xiangyang 441000China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Polyacrylic acid(PAA)hydrogel composites with different hexagonal boron nitride(h-BN)fillers were synthesized and successfully 3D-printed while their thermal conductivity was systematically *** the content of h-BN increasing from 0.1 wt%to 0.3 wt%,the thermal conductivity of the 3D-printed composites has been ***,through the shear force given by the 3D printer,a complete thermal conductivity path is obtained inside the hydrogel,which significantly improves the thermal conductivity of the h-BN hydrogel *** maximum thermal conductivity is 0.8808 W/(m·K),leading to a thermal conductive enhancement of 1000%,compared with the thermal conductivity of pure PAA *** study shows that using h-BN fillers can effectively and significantly improve the thermal conductivity of hydrogelbased materials while its 3D-printable ability has been maintained.

关键词： hydrogel composites boron nitride 3D printing thermal conductivity

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Finite Element Analysis of Thermal Stresses in Ceramic/Metal Gradient Thermal Barrier Coatings

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Journal of Wuhan University of technology(materials Science) 2005年第3期20卷 44-47页

作者：明平顺肖金生 School of Automotive Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

This paper studied the thermal stresses of ceramicl metal gradient thermal barrier coating which combines the conceptions of ceramic thermal barrier coating （TBC） and functionally gradient material （FGM）. Thermal stresses and residual thermal stresses were calculated by an ANSYS finite element analysis software. Negative thermal expansion coefficient method was proposed and element birth and death method was applied to analyze the residual thermal stresses which have non-uniform initial temperature field. The numerical results show a good agreement with the analytical results and the experimental results.

关键词： functionally gradient material thermal barrier coating thermal stress finite element analysis ANSYS

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Enhanced Thermoelectric Performance of Non-equilibrium Synthesized Fe0.4Co3.6Sb12-xGex Skutterudites via Randomly Distributed Multi-scaled Impurity Dots

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Journal of Wuhan University of technology(materials Science) 2018年第4期33卷 772-777页

作者：章嵩 HU Xuan 杨梅君 CHENG Hong TU Rong ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China The Center for Materials Research and Analysis Wuhan University of TechnologyWuhan 430070China

The p-type Ge doped Fe0.4Co3.6Sb12-xGex skutterudites with multi-scaled impurity dots（500 nm-2 mm） were successfully prepared by using melt-quenching（MQ） and subsequent spark plasma sintering（SPS） technique. Compared with traditional method, the new technology significantly shortened the processing time from several days to less than 24 hours. The phase of impurity dots was demonstrated to be CoSb through analysis of X-ray diffraction（XRD） and energy-dispersive spectrum（EDS）. Impurity dots were induced by Ge substitution of Sb in the non-equilibrium synthesized process. Due to the abandonment of the long reaction of annealing crystallization, a few of Ge atoms would fail to substitute Sb site of skutterudite in this non-equilibrium synthesized process, leading to that the multi-scaled impurity dots randomly distributed in the matrix of skutterudite Fe0.4Co3.6Sb12-xGex. The combination of multi-scaled impurity dots scattering long wavelength heat-carrying phonons and the point defect scattering short and middle wavelength heat-carrying phonons dramatically made the 22.2% reduction of lattice thermal conductivity. As a result, compared with unsubstituted sample of Fe0.4Co3.6Sb12, the maximum ZT value was increased by 30.5%. Thus, the two marked features of this new synthesis process, the shortened preparation time and the enhanced thermoelectric performance, would make a promising commercial application in the future.

关键词： multi-scaled impurity dots Sb site substitution p-type thermoelectric transport properties

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Structural Evolution of Graphene Oxide and Its Thermal Stability During High Temperature Sintering

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Journal of Wuhan University of technology(materials Science) 2022年第3期37卷 342-349页

作者： HU Lanxin WANG Aiyang WANG Weimin School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The thermal reduction of graphene oxide(GO)was performed by a tube furnace at different temperatures,and its structure evolution was investigated in *** results showed that the oxygen-containing functional groups on the carbon plane surface of GO gradually decomposed as the temperature increase,and the reduced graphene oxide(rGO)powder was obtained at 800℃.Then,rGO powder was sintered under 30 MPa at 1800℃using spark plasma sintering(SPS)and hot-pressing(HP)to evaluate its structural stability at high *** defect densities of rGO were reduced after high-temperature *** edge flatness and sp^(2) hybrid carbon plane structure were reconstructed *** results demonstrate that the lamellar structure of rGO maintains the structural integrity during high-temperature sintering without obvious deterioration,which provides experimental and theoretical supports for GO reinforced ceramics.

关键词： graphene oxide ceramics structure evolution thermal stability sintering

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High efficiency dual-band coding reflection metasurface in terahertz bands

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Optics Communications 2025年 587卷

作者： Chen, Ge Han, Weijia Liang, Wendong Chen, Bingxuan Zhang, Bohan Wei, Guochao Zhu, Wei Wang, Shengxiang State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China School of Mathematical and Physical Sciences Wuhan Textile University Wuhan430200 China School of Physical Science and Technology Northwestern Polytechnical University Xi'an710072 China

Here, we introduce a Terahertz (THz) dual-band coding reflective metasurface based on the Pancharatnam-Berry (PB) phase theory. The coding metasurface is consisted of a metal layer with hollow opening resonant ring on top of a double I-shaped deformation structure as the modified Polyimide (MPI) dielectric layer with a bottom reflective layer. It is capable of independent operation at two specific frequency bands of 0.33 THz and 0.51 THz. The high frequency double I-shaped deformation structure and the low frequency openwork resonant ring in the metal layer could be rotated and adjusted by PB phase theory to realize the continuous phase control from 0 to 2π. The coded cell at specific angles could construct coding arrays, achieving the modulation of wavefront. Due to the introduction of various encodings, the proposed metasurface enables to play a role as a vortex light generator at 0.33 THz, while it can act as a Radar Cross-section (RCS) reduction device to suppress the specular reflection of THz circularly polarized light at 0.51 THz. The simulated results show that the coding metasurface can work independently in low-frequency mode and high-frequency mode. In addition, the flexibility of the MPI layer indicates that the proposed metasurface has great potential for the integration of devices in the field of 6G communication and invisible coating. © 2025

关键词： Terahertz waves

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High infrared emissivity and heat dissipation ability of SiC/Edge-oxidized Graphene/ PVDF-HFP coatings near room temperature

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Carbon 2025年 242卷

作者： Yu, Xiaoxiao Zhang, Yu Nie, Xiaolei Song, Wei Chen, Lisha Li, Haotian Zhu, Wanting He, Danqi Liu, Mingrui Wei, Ping Zhao, Wenyu Zhang, Qingjie State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu 528000 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China

High infrared emissivity and excellent thermal conduction capability are crucial for the heat dissipation performance of heat dissipation coatings, which are applicable in the thermal management of modern electronic components. Herein, SiC nanowires/Edge-oxidized graphene/polyvinylidene fluoride hexafluoropropylene (SiC NWs/EOG/PVDF-HFP) composite coatings with three-dimensional thermal conductivity network structure were successfully prepared by the in-situ growth of SiC NWs between EOG layers through high-temperature carbothermal reduction reaction. The out-of-plane thermal diffusivity of the SiC NWs/EOG/PVDF-HFP composite coating was increased by 27 %, as compared with that of the EOG/PVDF-HFP coating, which was originating from the enhanced phonon conduction in the vertical direction by the in-situ growth of SiC NWs. The stacking faults and twin crystals generated by SiC NWs, the structural defects introduced by EOG, and the multi-scale surfaces and interfaces introduced by EOG and SiC NWs have jointly improved the infrared emissivity, enabling the SiC NWs/EOG/PVDF-HFP composite coating achieved an emissivity of 0.92. The copper plate coated with SiC NWs/EOG/PVDF-HFP coating achieved a temperature drop benefit of 9.3 °C, increasing by 126 %, 93 % and 78 %, respectively, as compared with that of the copper plate coated with EOG/PVDF-HFP coating, the copper plate coated with mechanically compounded SiC/EOG/PVDF-HFP coating, and the copper plate coated with mechanically compounded SiC NWs-EOG/PVDF-HFP coating. These findings highlight the great potential of the SiC NWs/EOG/PVDF-HFP composite coatings for application in the thermal management of electronic devices. © 2025 Elsevier Ltd

关键词： Stacking faults

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Titanium nitrides as novel reactants for in-situ synthesis of TiB_(2)-based composites with improved properties

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Journal of materials Science & technology 2023年第14期145卷 48-55页

作者： Ji Zou Huayue Liang Jingjing Liu Weimin Wang Fan Zhang Wei Ji Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

A novel in-situ reactive approach based on the reactions among TiN,aluminum and boron has been developed to synthesize TiB_(2)-based composites including TiB_(2)-h BN(TB)and TiB_(2)-h BN-AlN(TBA).Fully dense ceramics with fine-grained microstructure were successfully obtained via spark plasma sintering at 1850℃/60 MPa/5 *** analysis suggests h BN flakes were homogenously distributed in the TiB_(2)*** AlN,however,they were elongated into plate-like grains during sintering,in which lots of defects in terms of stacking faults and twinning structures were *** mechanical and thermophysical properties of as-sintered ceramics were comprehensively investigated and ***-corporating AlN significantly improved the flexure strength,hardness,fracture toughness and thermal conductivity of TiB_(2)-h BN *** electrical conductivity of TB(3.06×10^(6)S/m)is larger than that of TBA(2.35×10^(6)S/m)at room temperature,but the value(6×10^(5)S/m)was lower than that of TBA(6.9×10^(5)S/m)at 1173 *** on the measurement of electrical and thermal conductivity,electron and phonon contributions to thermal conductivities of TB and TBA were calculated and their temperature dependences were illustrated.

关键词： Borides Microstructure Spark plasma sintering Mechanical property Thermo-physics property

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Solute segregations at the space-charge layers of stabilized zirconia: An opportunity for ameliorating conductivity

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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 1996年第5期16卷 575-578页

作者： Guo, X State Key Laboratory for Synthesis and Processing of Advanced Materials Wuhan University of Technology Wuhan Hubei Province 430070 People's Republic of China

According to a space-charge theory analysis, the space-charge potential of YSZ is negative, which corresponds to a V-0(..) depletion in the space-charge layer. An extremely low grain-boundary conductivity of the high-purity YSZ is thus explained. Under the condition that the bulk property is ensured by the optimal dopant additions, an idea of increasing the grain-boundary conductivity by the segregations of solutes with positive effective charge is put forward. The most likely driving force for the segregations is the elastic strain energy. And the feasibility of this idea has been proved by some experimental and theoretical results.

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Thermodynamics aided design of hBN-capsulated diboride powders from novel nitrate precursors for high entropy ceramics

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Journal of materials Science & technology 2024年第11期178卷 133-142页

作者： Hailing Yang Ji Zou Zhimin Xiong Jingjing Liu Weimin Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China

Hexagonal BN-coated powders have been widely used in various engineering sectors,however,their pro-ductions are restricted by the complexity of gas-solid *** this study,guided by thermodynamics,a novel approach to synthesize Layer-structured hexagonal BN(hBN)-coated high entropy diboride pow-ders in vacuum was developed,using metal salt Zr(NO_(3))4·5H_(2)O,HfCl_(4),NbC_(15),TaC_(15),C_(16)H_(36)O_(4)Ti,boric acid,and sucrose as raw *** adjusting the ratio of carbon to metal source(C/M),powders only consisting of two boride solid solutions and hBN were finally obtained,under an optimal process-ing condition of C/M=5.5 and synthesis temperature of 1400 ℃.Parts of hBN were found to coat on high-entropy metal diborides ceramic(HEB)particles,corresponding formation mechanism for core-shell structured powders was investigated,together with the liquid precursor assisted boro/carbothermal re-duction *** from as-synthesized core-shell powders,(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))B2-11 vol%hBN ceramics were densified at 1900 ℃ under 50 MPa without holding,with a high relative density of 97.3%.

关键词： High entropy boride Boro/carbothermal reduction Sol-gel Core-shell powders Densification

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