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A novel mullite anti-gyroid/SiC gyroid ceramic metastructure based on digital light processing 3D printing with enhanced electromagnetic wave absorption and mechanical properties

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Journal of Advanced ceramics 2024年第8期13卷 1212-1222页

作者： Chaoyang Wang Xiao Chen Zhicheng Wang Jjalin Bai Jie Tang Yulong She Zhengren Huang Yong Yang State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

Sic-based composites are widely used as electromagnetic wave absorbers due to their excellent dielectric ***,the constraints associated with structural design and the intricacies of the preparation process hinder their broader *** this study,novel mullite anti-gyroid/SiC gyroid metastructures are designed to integrate the mechanical and electromagnetic wave(EMW)absorption properties of composite *** anti-gyroid/SiC gyroid composites are fabricated utilizing a combination of digital light processing(DLP)three-dimensional(3D)printing and precursor infiltration and pyrolysis(PiP)*** the modulation of structural units,the electromagnetic parameters can be effectively regulated,thus improving the impedance matching characteristics of the *** structural composites show outstanding EMW absorption properties,with a minimum reflection loss of-54 dB at a thickness of 1.9 mm and an effective absorption bandwidth of 3.20 GHz at a thickness of 2.2 ***,the PIP process significantly enhances the mechanical properties of the composites;compared with those of the mullite/SiC ceramics,the flexural strength of the composites is improved by 3.69-5.85 times(13.28±1.15 MPa vs.(49.05±1.07)-(77.78±3.72)MPa),and the compressive strength is improved by 4.59-13.58 times(8.55±0.90 MPa vs.(39.02±1.63)-(116.13±2.58)MPa).This approach offers a novel and effective method for fabricating structural composites with an expanded range of higher electromagnetic wave absorption properties and improved mechanical properties.

关键词： mullite anti-gyroid/SiC gyroid metastructures digital light processing(DLP) precursor infiltration and pyrolysis(PIP) electromagnetic waveabsorption

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Doping-induced charge transfer in conductive polymers

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Chinese Chemical Letters 2024年第1期35卷 45-51页

作者： Siyi Luo Zhen Xu Fei Zhong Hui Li Lidong Chen State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Molecular doping has become a widely used method to modulate the electric performance of organic semiconductors(OSC).highly effective charge transfer during molecular doping is desired to achieve ideal electrical *** types of charge transfer mechanisms are widely accepted in molecular doping process:integer charge transfer(ICT)and charge transfer complex(CTC).In this review,fundamental principles of two mechanisms are revisited and the characterization methods are *** key points for the formation of two mechanisms are highlighted from aspects of molecular structure and process ***,the strategies to improve the proportion of ICT are ***,the challenges and perspectives for future developments in the molecular doping of polymer semiconductors are provided.

关键词： Molecular doping Charge transfer Integer charge transfer Charge transfer complex Conjugated polymer

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Elevating the comprehensive thermal properties of rare-earth cerates through high-entropy design

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Journal of Materiomics 2024年第5期10卷 1126-1136页

作者： Zhaoxuan Zhang Yiling Huang Fan Peng Wei Zheng Caifen Jiang Xuemei Song Yi Zeng School of Microelectronics Shanghai UniversityShanghai201800China The State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of ScienceShanghai200050China

In the rapidly evolving aerospace sector,the quest for sophisticated thermal barrier coating(TBC)materials has *** materials are primarily sought for their superior comprehensive thermal characteristics,which include a low thermal conductivity coupled with a high coefficient of thermal expansion(CTE)that synergizes with the *** our study,we adopt a solid-state method to synthesize a series of high-entropy rare-earth cerates:La_(2)Ce_(2)O_(7)(1RC),(La_(1/2)Nd_(1/2))2Ce_(2)O_(7)(2RC),(La_(1/3)Nd_(1/3)Sm_(1/3))_(2)Ce_(2)O_(7)(3RC),(La_(1/4)Nd_(1/4)Sm_(1/4)Eu_(1/4))_(2)Ce_(2)O_(7)(4RC),and(La_(1/5)Nd_(1/5)Sm_(1/5)Eu_(1/5)Gd_(1/5))_(2)Ce_(2)O_(7)(5RC),all sintered at 1,600℃ for 10 *** thoroughly examine their phase structure,morphology,elemental distribution,and thermal *** in-depth analysis of the phonon scattering mechanisms reveals that 4RC and 5RC exhibit exceptional thermal properties:high CTEs of 13.00×10^(−6) K^(−1) and 12.77×10^(−6) K^(−1) at 1,400℃,and low thermal conductivities of 1.55 W/(m·K)and 1.68 W/(m·K)at 1,000℃,*** to other TBC systems,4RC and 5RC stand out for their excellent thermal *** study significantly contributes to the development of high-entropy oxides for TBC applications.

关键词： Thermal barrier coatings(TBCs) Comprehensive thermal properties Coefficient of thermal expansion Thermal conductivity Phonon scattering mechanisms

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Suppressing the donor-like effect via fast extrusion engineering for high thermoelectric performance of polycrystalline Bi_(2)Te_(2.79)Se_(0.21)

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Journal of Materiomics 2023年第2期9卷 345-352页

作者： Xusheng Liu Tong Xing Pengfei Qiu Tingting Deng Peng Li Xuewen Li Xiaoya Li Xun Shi State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Key Lab for Light-weight Materials Nanjing Tech UniversityNanjing211816China

Bi2Te3-based alloys are the most mature commercial thermoelectric(TE)materials for the cooling application near room ***,the poor mechanical properties of the commercial zone melting(ZM)ingot severely limits the further ***,due to the donor-like effect,the robust polycrystalline n-type bulks usually have low TE performance near room ***,based on the commercial ZM ingots,a high figure of merit(zT)of 1.0 at 320 K and good mechanical properties are achieved via the hot *** dynamic recrystallization in the hot-extrusion process can suppress the donor-like effect and refine the large ZM grains into fine-equiaxed ***,the obtained polycrystalline Bi2Te2.79Se0.21 has good preferential orientation and high carrier mobility(m).The high m and the weaken donor-like effect maintain the high power factor(PF)of 43.1 mW cm^(-1)K^(-2)in the hot-extruded ZM *** to the enhanced phonon scattering,the total thermal conductivity ktot decreased to 1.35 W·m^(-1)·K^(-1).To demonstrate the good mechanical properties of the extruded ZM sample,micro TE dices with the cross sections of 300μm×300 mm and 200μm×200 mm are successfully cut from the extrusion *** study provided a fast and low-cost extrusion technique to improve the TE and mechanical properties of the commercial ZM ingot at room temperature.

关键词： Thermoelectric Bismuth telluride Donor-like effect Hot extrusion

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Microstructural tailoring,mechanical and thermal properties of SiC composites fabricated by selective laser sintering and reactive melt infiltration

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Journal of Advanced ceramics 2023年第4期12卷 830-847页

作者： Xiao Chen Jie Yin Longzhi Huang Sea-Hoon Lee Xuejan Liu Zhengren Huang State Key Lab of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Extreme Materials Institute Korea Institute of Materials ScienceChangwon 51508Republic of Korea

Poor flowability of printable powders and long preparation cycles are the main challenges in the selective laser sintering(SLS)of chopped carbon fiber(C_(f))reinforced silicon carbide(SiC)composites with complex *** this study,we develop an efficient and novel processing route in the fabrication of lightweight SiC composites via the SLS of phenolic resin(PR)and Cr powders with the addition of a-SiC particles combined with the one-step reactive melt infiltration(RMI).The effects of a-SiC addition on the microstructural evolution of the C_(f)/SiC/PR printed bodies,C_(f)/SiC/C green bodies,and derived SiC composites were *** results indicate that the added a-SiC particles play an important role in enhancing the flowability of raw powders,reducing the *** the reliability of the C/SiC/C green bodies,and contributing to improving the microstructure homogeneity and mechanical properties of the SiC *** maximum density,flexural strength,and fracture toughness(Kic)of the SiC composites are 2.749±0.006 g·cm^(3),266±5 MPa,and 3.30±0.06 MPa-m,*** coefficient of thermal expansion(CTE,a)of the SiC composites is approximately 4.29×10^(-6)K^(-1)from room temperature(RT)to 900℃,and the thermal conductivity(x)is in the range of 80.15-92.48 W·m^(-1)·K^(-1)at *** high-temperature strength of the SiC composites increase to 287±18 MPa up to 1200℃.This study provides a novel as well as feasible tactic for the preparation of high-quality printable powders as well as lightweight,high-strength,and high-x SiC composites with complex structures by the SLS and RMI.

关键词： chopped carbon fiber(C_(f)) microstructural tailoring selective laser sintering(SLS) mechanical properties thermal properties

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Anion-tuned nickel chalcogenides electrocatalysts for efficient 2e−ORR towards H_(2)O_(2)production in acidic media

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Nano Research 2023年第4期16卷 4729-4735页

作者： Qingjia Sun Guanxing Xu Bingyan Xiong Lisong Chen Jianlin Shi Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Institute of Eco-Chongming Shanghai 202162China State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

Electrocatalytic 2e−oxygen reduction reaction(2e−ORR)is a promising approach to producing H_(2)O_(2) at ambient temperature and pressure especially in acidic media,which,however,is hindered by the high cost of precious metal-based ***,the development of efficient earth-abundant electrocatalysts and reaction mechanism exploration for H_(2)O_(2) production by 2e−ORR in acidic solution are critically important but remain challenging at *** this work,NiSe_(2)has been developed as a novel and high-performance 2e−ORR electrocatalyst in acidic media,moreover,using nickel chalcogenides as the models,the influence of different anion species(Se_(2)^(2−),S22−,and O^(2−))on 2e−ORR electrocatalytic performance of the catalysts has been *** synthesized NiSe_(2)exhibits outstanding 2e−ORR performance of high selectivity(90%)and long-term durability(12 h).The maximum H_(2)O_(2) concentration of NiSe_(2)reaches 988 ppm,which is the highest among all the reported transition metal *** work demonstrates a novel point of view in anion tuning for designing high-efficiency transition-metal-based electrocatalysts for 2e−ORR.

关键词： hydrogen peroxide oxygen reduction reaction electrosynthesis anions

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Fabrication of AION transparent ceramics with Si_(3)N_(4) sintering additive

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Journal of Advanced ceramics 2023年第7期12卷 1361-1370页

作者： Liqiong An Rongwei Shi Xiaojian Mao Buhao Zhang Jianmin Li Jian Zhang Shiwei Wang College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Faculty of Engineering University of NottinghamNottingham NG72RDUK

In this paper,Si_(3)N_(4) was used as a novel solid-state sintering additive to prepare AION transparent ceramics with high transparency and flexural strength via the pressureless pre-sintering and hot isostatic pressing(HIP)method at a relatively low HIP temperature(1800℃).The effect of Si_(3)N_(4) content on the phase,microstructure,optical property,and flexural strength was *** experimental results showed that a Si element was homogenously distributed in both pre-sintered and HIPed AION *** densification enhanced,the grain grew with the increasing Si_(3)N_(4) content in the pre-sintered AION ceramics,and all the samples became pore-free after HIP,which favor *** AION ceramics doped with 0.10 wt%Si_(3)N_(4) had the highest transmittance of 83.8%at 600 nm and 85.6%at 2000 nm(4 mm in thickness),with flexural strength of 404 MPa,which were higher than those of the previous reports.

关键词： transparent ceramics alumina oxynitride(AION) sintering additive Si_(3)N_(4) hot isostatic pressing(HIP)

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Investigation of improving the thermophysical properties and corrosion resistance of RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates by component design with RE doping

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Journal of Advanced ceramics 2024年第6期13卷 842-860页

作者： Zeyu Chen Yiling Huang Zhaoxuan Zhang Wei Zheng Xuemei Song Yaran Niu Yi Zeng The State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Inorganic Coating Materials CAS Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

In this research,a novel method for regulating components in RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates was developed,combining the benefits of a suitable thermal expansion coefficient(CTE)and outstanding corrosion resistance against calcium–magnesium–alumino–silicate(CMAS).This approach enhanced the overall thermophysical ***,the results from the CMAS corrosion resistance test indicated that(Lu_(1/3)Yb_(1/3)Tm_(1/3))_(2)SiO_(5)/(Lu_(1/3)Yb_(1/3)Tm_(1/3))_(2)Si_(2)O_(7)and(Lu_(1/4)Yb_(1/4)Tm_(1/4)Er_(1/4))_(2)SiO_(5)/(Lu_(1/4)Yb_(1/4)Tm_(1/4)Er_(1/4))_(2)Si_(2)O_(7)exhibited exceptional resistance to CMAS penetration,even at temperatures up to 1500℃.To comprehend the corrosion mechanism of CMAS on these silicates,we introduced a reaction–diffusion model,which involved observing the changes in the interface between the corrosion product layer and the silicate *** was achieved using electron backscatter diffraction(EBSD).These findings lay a theoretical basis for selecting rare earth elements in RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates based on the radii of different rare earth cations.

关键词： thermal conductivity environmental barrier coatings(EBCs) thermal expansion coefficient(CTE) multiphase silicates calcium-magnesium-alumino-silicate(CMAS)corrosion resistance reaction-diffusion

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Integrated multi-scale synchrotron radiation-technology studies on AlPO_(4)-coating modification mechanism in lithium-rich manganese-based cathode

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Nuclear Science and Techniques 2025年第5期36卷 30-42页

作者： Zhong-Qin Dai Huan Chen Zhao-Yin Wen School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China The State Key Lab High-Performance Ceram&Superfine Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China University of Chinese Academy of Science Beijing 100049China

Lithium-and manganese-rich(LMR)oxide cathode materials are among the most attractive candidates for next-generation energy-storage materials owing to their anomalous ***,severe Mn dissolution that occurs during long-term cycling,which leads to capacity loss,hinders their application *** this study,nanoscale AlPO_(4)-coated Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2)(LMR@APO)with significantly enhanced electrochemical performance is successfully synthesized using a simple and effective sol–gel method to mitigate Mn dissolution and suppress local structural distortion at high *** of the complex evolution of the structure and oxidation state of LMR materials during electrochemical cycling,observing and analyzing them using traditional single characterization methods may be ***,we combine various synchrotron-based characterization techniques to conduct a detailed analysis of the electronic and coordination structures of the cathode material from the surface to the ***-based hard and soft X-ray spectroscopies are integrated to investigate the differences in O and Mn evolution between the surfaces and bulk of the *** synchrotron-based transmission X-ray microscopy combined with X-ray near-edge absorption-structure technology is utilized to visualize the two-dimensional nanometer-scale reactivity of the LMR *** AlPO_(4)-coating layer can stabilize the surface structure of the LMR material,effectively alleviating irreversible oxygen release on the surface and preventing the dissolution of Mn^(2+)at the interface caused by side reactions after a long ***,the spatial reaction uniformity of Mn is enhanced by the AlPO_(4)-coating layer,and rapid capacity decay caused by Mn deactivation is *** AlPO_(4)-coating method is a facile modification strategy for high-performance LMR materials.

关键词： Synchrotron radiation X-ray absorption fine structure X-ray imaging Amorphous coating layer Lithium-and manganese-rich(LMR)cathode

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Dynamic lithium-compensation mechanism for densification of garnet-type Li_(7)La_(3)Zr_(2)O_(12)electrolyte by Li_(2)O atmosphere buffer pair

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Nano Research 2024年第7期17卷 6184-6191页

作者： Chujun Zheng Ya Chen Haoxin Dong Yan Lu Jun Jin Zhaoyin Wen CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of CeramicsChinese Academy of ScienceShanghai 200050China State Key Lab High Performance Ceram and Superfine Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Solid-state lithium metal batteries are one of the most promising options for next-generation batteries pursuing high-energy density and ***,the inevitable volatilization of lithium compounds during sintering leads to low relative density and low ionic conductivity of solid-state ***,the dynamic lithium-compensation mechanism is proposed to facilitate the densification of Ta-substituted garnet-type electrolyte(Li_(6.5)La_(3)Zr_(1.5)Ta_(0.5)O_(12)(LLZT))through the reversible manipulating of Li_(2)O ***_(2)ZrO_(3)is used as mother powder additive,which reacts with Li_(2)O in sintering atmosphere and forms Li_(6)Zr_(2)O_(7).Li_(2)ZrO_(3)/Li_(6)Zr_(2)O_(7)buffer pair manipulates the sintering Li_(2)O atmosphere,which is vital for LLZT,within the Li_(2)O partial pressure range corresponding to Li_(2)ZrO_(3)and Li_(6)Zr_(2)O_(7).Furthermore,the reversibility mechanism of buffer pair for Li_(2)O absorption and release is *** obtained LLZT exhibits a relative density of over 96%and an ionic conductivity exceeding 7×10^(−4)S·cm^(−1)with no abnormal grain *** symmetric cell demonstrates an excellent lithium dendrite suppressing ability(stable cycling at a current density of 0.3 mA·cm^(−2)for over 1000 h).Such dynamic lithium-compensation strategy has been successfully applied in atmosphere manipulation of LLZT sintering process,which reduces the dependence of LLZT on the Li_(2)O atmosphere,making it conducive to large-scale preparation of electrolyte ceramics.

关键词： solid-state batteries garnet-type electrolyte high-density electrolyte dynamic lithium-compensation buffer pair

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