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Enhancing microwave absorption performance of MoS_(2)by synergistic effect of Fe doping

Journal of advanced Ceramics 2025年第3期14卷 79-90页

作者： Yuefeng Yan Guangyu Qin Kaili Zhang Boshi Gao Guansheng Ma Xiaoxiao Huang Yu Zhou National Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of Technology Harbin 150001China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing TechnologyHarbin Institute of TechnologyHarbin 150001China

Owing to its unique two-dimensional structure and tunable electronic properties,MoS_(2)has emerged as a promising electromagnetic wave(EMW)-absorbing material that can be extensively combined with various other substances to construct effective EMW ***,research on cation substitution doping in MoS_(2)remains relatively limited,which impedes the design and development of high-performance MoS_(2)-based EMW absorbing *** this study,MoS_(2)was synthesized with various concentrations of doped Fe via a facile hydrothermal *** thoroughly investigated the effects of Fe doping,which induced lattice distortion and collapse,triggered a 1T‒2H phase transition,and led to the formation and evolution of second *** modulation of phase transitions,coupled with doping-induced lattice defects that enhance polarization and interfacial polarization from second phases,enabled the Fe-doped MoS_(2)samples to exhibit remarkable EMW absorption ***,the sample FM3 achieved an effective absorption bandwidth(EAB)of 5.1 GHz and a minimum reflection loss(RLmin)of−60.6 dB,underscoring the critical role of Fe doping in increasing the EMW absorption *** research provides valuable pathways and unique insights for the advancement of transition metal dichalcogenides(TMDs)as high-performance EMW-absorbing materials.

关键词： microwave absorption Fe-doped MoS_(2) dielectric property impedance characteristic second phase

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Boosting bidirectional conversion of polysulfide driven by the built-in electric field of MoS_(2)/MoP Mott–Schottky heterostructures in lithium–sulfur batteries

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Journal of advanced Ceramics 2023年第10期12卷 1872-1888页

作者： Meixiu Song Yanan Liu Jingzhe Hong Xiaoshuang Wang Xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural–Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China

Heterostructure engineering for sulfur hosts is an effective way to achieve interfacial synergistic effects on suppressing the“shuttle effect”of polysulfides and thus improve electrochemical performance of lithium–sulfur(Li–S)*** selection and design of different components into heterostructures is vital to enhance the synergistic ***,MoS_(2)/MoP Mott–Schottky heterostructure nanoparticles decorated on reduced graphene oxide(MoS_(2)/MoP@rGO)are fabricated and used as sulfur host *** calculation and experiment results reveal that the in-situ introduction of MoP could tune the electronic structure,activate the basal plane of MoS_(2),and achieve the interfacial synergistic effects between adsorption(MoS_(2))and fast conversion(MoP).Such synergistic effects enable MoS_(2)/MoP@rGO to not only remarkably facilitate Li_(2)S deposition during the discharging process but also significantly accelerate the Li_(2)S dissolution during the charging process,demonstrating bidirectional promotion ***,the designed cathode delivers initial capacity of 919.5 mA·h·g^(−1)with capacity of 502.3 mA·h·g^(−1)remaining after 700 cycles at 0.5 *** under higher sulfur loading of 4.31 mg·cm^(−2)and lower electrolyte to sulfur(E/S)ratio of 8.21μL·mg^(−1),the MoS_(2)/MoP@rGO@S cathode could still achieve good capacity and cycle *** work provides a novel and efficient structural design strategy of sulfur hosts for high-performance Li–S energy storage systems.

关键词： MoS_(2)/MoP Mott-Schottky heterostructures synergistic effect bidirectional polysulfide conversion shuttle effect lithium-sulfur(Li-S)batteries

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Cl-terminated decoration to modulate the permittivity of MXene for enhanced electromagnetic-absorbing performance

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Journal of materials Science & Technology 2024年第12期179卷 187-197页

作者： Yunfei He Dongdong Liu Qiang Su Bo Zhong Long Xia Xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264009China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China

The explosive growth of communication technology has given rise to a large number of high-quality electromagnetic wave(EMW)absorbing materials,and single-component materials are often difficult to satisfy the *** this study,we propose an etching method of molten chlorine salts under vac-uum to prepare Cl-terminated MXene(MX-Cl)which can meet the requirements of"thin,light,wide and strong"and realize the application of single-component absorbing *** the X and Ku bands,MX-Cl achieves a strong reflection loss of-42.99 dB and an effective absorption bandwidth of 3.44 GHz with the 1.2 mm matching *** presence of Cl groups restricts the free electron movement of surface-Ti,which controls the conductivity of the MX-Cl and optimizes its *** polarization induced by Ti-Cl,interfacial polarization between MXene layers and multiple scattering effects inside the layers all significantly increase the dielectric loss of the MX-Cl *** study provides a new approach to investigating the effect of single atoms on the dielectric properties of *** work also offers a simple and low-cost process for the preparation of single-component MXene EMW-absorbing materials.

关键词： Cl-terminated MXene Conductivity mechanism Multi-polarization effect Electromagnetic wave absorption

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A bi-functional catalyst strategy to selectively regulate sulfur redox kinetics in lithium-sulfur batteries

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Journal of materials Science & Technology 2024年第6期173卷 54-62页

作者： Yanan Liu Xiaoxiao Huang Honglei Zhang Guangyu Qin Xiaoshuang Wang Meixiu Song Hongbo Liang Jingzhe Hong Yudong Huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China

Designing electrochemical catalysts has become a research hotspot due to their accelerating the polysulfide conversion of the sulfur cathode to inhibit the“shuttle effect”in lithium-sulfur ***,it is still a great challenge to design the heterogeneous selective electrochemical catalyst for inhibiting the“shuttle effect”.Herein,nickel cobalt phosphide and cobalt phosphide as the heterogeneous catalyst active sites embedded in the nitrogen-doped hollow carbon nanocages(NiCoP@CoP/NC)are reported,used for multi-step and multi-phase sulfur electrode reaction,and it is found that metal-sulfur d-p hybridization can effectively indicate the intrinsic catalytic activity of metal *** of labor and cooperation of the bi-active NiCoP@CoP as heterogeneous catalysts propel the stepwise polysulfide *** and CoP sites preferentially accelerate the long-chain polysulfide conversion reaction(S_(8)■LiPSs)and the short-chain polysulfide conversion reactions(LiPSs■Li_(2)S),***,the hollow and porous N-doped carbon structure can successfully suppress the volume effect and improve the conductivity of the sulfur *** unique design can obtain an effective inhibition of the shuttle effect and rapid electrode *** a result,Li-S batteries demonstrate a high initial capacity of 1063 mAh g^(-1) and a low-capacity decay of 0.04% per cycle within 1000 *** work provides a feasible idea for the design of host materials in Li-S batteries.

关键词： Shuttle effect d-p hybridization Heterogeneous catalysts Stepwise polysulfide conversion

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Dielectric–magnetic manipulation of reduced graphene oxide permittivity for enhanced electromagnetic wave absorption

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Journal of advanced Ceramics 2024年第12期13卷 1974-1984页

作者： Kaili Zhang Zhen Wang Yuefeng Yan Guansheng Ma Renchao Che Dechang Jia Xiaoxiao Huang Yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China

Graphene is a promising electromagnetic wave absorption(EMWA)material because of its structural designability,controllable electromagnetic properties,and excellent ***,the impedance mismatch caused by high conductivity and dielectric properties has seriously hindered the application of graphene in the EMWA *** this work,based on the dielectric dispersion behavior of ideal broadband absorption as a guide,a Fe microsheet/reduced graphene oxide(Fe/RGO)composite was prepared by simple hydrothermal and thermal reduction *** permittivity of RGO is optimized by adjusting the content of anisotropic Fe microsheets,and a balance between attenuation ability and impedance matching is *** calculations and off-axis electron holography results reveal that the abundant polar sites and heterogeneous interfaces of Fe and RGO enhance the dipole and interface *** threedimensional(3D)conductive network structure contributes to multiple reflections of incident electromagnetic waves and conduction *** natural and exchange resonances and eddy current loss caused by anisotropic Fe microsheets further increase magnetic *** on the dielectric-magnetic loss mechanism and good impedance matching,Fe/RGO achieves a minimum reflection loss(RL_(min))of−67.95 dB at 8.48 GHz and a maximum effective absorption bandwidth(EAB_(max))of 6.91 GHz(11.09–18 GHz)with a low filling content of 10 wt%.In addition,Fe/RGO has excellent radar stealth performance,with a radar cross section(RCS)of−31.21 dBm^(2) at 0°.Therefore,the proposed strategy and theoretical analysis provide a reference for the microstructure design,composition,and mechanism analysis of EMWA materials.

关键词： electromagnetic wave absorption(EMWA) Fe microsheets reduced graphene oxide(RGO) dielectric-magnetic loss impedance matching

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Low thermal conductivity of dense(TiZrHfVNbTa)C_(x) high-entropy carbides by tailoring carbon stoichiometry

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Journal of advanced Ceramics 2023年第1期12卷 49-58页

作者： Lei CHEN Wen ZHANG Wenyu LU Boxin WEI Sijia HUO Yujin WANG Yu ZHOU Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structural–Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150001China

Transition metal carbides are promising candidates for thermal protection materials due to their high melting points and excellent mechanical ***,the relatively high thermal conductivity is still a major obstacle to its application in an ultra-high-temperature insulation *** this work,the low thermal conductivity of dense(TiZrHfVNbTa)Cx(x=0.6-1)high-entropy carbides has been realized by adjusting the carbon *** thermal conductivity gradually decreases from 10.6 W·m^(−1)·K^(−1) at room temperature to 6.4 W·m^(−1)·K^(−1) with carbon vacancies *** to enhanced scattering of phonons and electrons by the carbon vacancies,nearly full-dense(97.9%)(TiZrHfVNbTa)C_(0.6) possesses low thermal conductivity of 6.4 W·m^(−1)·K^(−1),thermal diffusivity of 2.3 mm^(2)·s^(−1),as well as electrical resistivity of 165.5μΩ·*** thermal conductivity of(TiZrHfVNbTa)C_(0.6) is lower than that of other quaternary and quinary high-entropy carbide ceramics,even if taking the difference of porosity into account in some cases,which is mainly attributed to compositional complexity and carbon *** provides a promising route to reduce the thermal conductivity of high-entropy carbides by increasing the number of metallic elements and carbon vacancies.

关键词： high-entropy carbides thermal conductivity compositional complexity carbon vacancies

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Tracking Regulatory Mechanism of Trace Fe on Graphene Electromagnetic Wave Absorption

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Nano-Micro Letters 2024年第4期16卷 79-96页

作者： Kaili Zhang Yuhao Liu Yanan Liu Yuefeng Yan Guansheng Ma Bo Zhong Renchao Che Xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438People’s Republic of China

Polarization and conductance losses are the fundamental dielectric attenuation mechanisms for graphene-based absorbers, but it is not fully understood in revealing the loss mechanism of affect graphene itself. For the first time, the reduced graphene oxide(RGO) based absorbers are developed with regulatory absorption properties and the absorption mechanism of RGO is mainly originated from the carrier injection behavior of trace metal Fe nanosheets on graphene. Accordingly, the minimum reflection loss(RLmin) of Fe/RGO-2composite reaches-53.38 dB(2.45 mm), and the effective absorption bandwidth achieves 7.52 GHz(2.62 mm) with lower filling loading of 2 wt%. Using off-axis electron hologram testing combined with simulation calculation and carrier transport property experiments, we demonstrate here the carrier injection behavior from Fe to graphene at the interface and the induced charge accumulation and rearrangement, resulting in the increased interfacial and dipole polarization and the conductance loss. This work has confirmed that regulating the dielectric property of graphene itself by adding trace metals can not only ensure good impedance matching, but also fully exploit the dielectric loss ability of graphene at low filler content,which opens up an efficient way for designing lightweight absorbers and may be extended to other types materials.

关键词： Reduced graphene oxide Fe nanosheets Dielectric loss Electromagnetic wave absorption

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Mechanical properties,thermal conductivity and defect formation energies of samarium immobilization in Gd_(2)Zr_(2)O_(7):First-principles study and irradiation experiment

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Journal of Rare Earths 2023年第3期41卷 422-433,I0004页

作者： Yuhao Wang Jiahu Ouyang Tao Wei Gui Cao Zhanguo Liu Zhaoying Ding Yujin Wang Yaming Wang Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Nuclear Fuel Cycle Research Theme Australian Nuclear Science and Technology OrganisationLocked Bag 2001Kirrawee DCNSW2232Australia

A density functional theory(DFT)study was employed to investigate the mechanical property,thermal conductivity,Debye temperature,electronic structure and defect chemistry of(Gd_(1-x)Sm_(x))_(2)Zr_(2)O_(7).All the(Gd_(1-x)Sm_(x))_(2)Zr_(2)O_(7) compounds exhibit an excellent structural and mechanical stability(Gd_(0.25)Sm_(0.75))_(2)Zr_(2)O_(7) has the lowest Young’s modulus of 213.7 GPa,the largest Possion’s ratio of 0.292,the lowest Debye temperature of 491.8 K and the lowest thermal *** calculated thermal conductivities of(Gd_(1-x)Sm_(x))_(2)Zr_(2)O_(7) are 1.17-1.21 W/(m·K)by the Clark’s model and 1.32-1.36 W/(m·K)by the Cahall’s model,*** formation energies of O vacancies at 48f site are negative,which increase with the Sm content,however,the formation energies of O vacancies at 8b site are almost *** addition,Sm partly occupying the Gd-site reduces distinctly the formation energies of defects such as A-site vacancies,cation antisite defects,anion Frenkel pairs of oxygen at 8b site and cation interstitials,which suggests that Sm-doped Gd_(2)Zr_(2)O_(7),especially equimolar GdSmZr_(2)O_(7),has a better irradiation *** the 16 MeVTa-ion irradiation at a fluence of 1×10^(14) or 2×10^(14) ions/cm^(2),the crystal structure of GdSmZr_(2)O_(7) transforms from pyrochlore to a defect fluorite without obvious amorphous phase.

关键词： Pyrochlores First-principles calculations Mechanical properties Defect formation energies Ion irradiation Rare earths

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Printing and electromagnetic characteristics of 3D printing frequency selective surface using graphene

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Journal of materials Science & Technology 2022年第16期111卷 49-56页

作者： Guo-Xiang Zhou Zhe Zhao Yan-zhao Zhang Wen-jin Liu Zhi-Hua Yang De-Chang Jia Yu Zhou Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150080China

The study of Frequency Selective Surface(FSS)by Direct ink writing(DIW)has attracted much attention due to the convenience and effectiveness of 3D printing ***,the limited printing precision of DIW has heavily restricted its applications as the electromagnetic performance is highly sensitive to it,especially the precision at the ***,the ultra-high printing precision of FSS was achieved through DIW by the uniformly dispersed graphene sheets to deeply modify the rheological behavior and the steric hindrance ***,the highly precision of the printed filament width as thin as67μm with a space of only 42μm were achieved,which is difficult for conventional DIW,and no structural distortion is found after 3D printing,no matter it was 2D printed on a flat surface or the sharply skewed hook face,or even 3D printed to architectural *** to the highly improved precision,the electromagnetic performance matching between the designed model and the printed physical FSS device was perfectly achieved,reducing the center frequency error less than 0.3 GHz,and the transmission coefficient error less than *** work promises an effective and easy preparation of high-quality FSS from the aid of graphene.

关键词： Graphene 3D printing Rheological Precision Frequency selective surface

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The highest melting point material:Searched by Bayesian global optimization with deep potential molecular dynamics

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Journal of advanced Ceramics 2023年第4期12卷 803-814页

作者： Yinan Wang Bo Wen Xingjian Jiao Ya Li Lei Chen Yujin Wang Fu-Zhi Dai Artificial Intelligence for Science Institute Beijing 100084China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China College of Computer Science and Technology Heilongjiang Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China DP Technology Bejing 100080China

The interest in refractory materials is increasing rapidly in recent decades due to the development of hypersonic ***,the substance that has the highest melting point(Tm)keeps a secret,since precise measurements in extreme conditions are overwhelmingly *** the present work,an accurate deep potential(DP)model of a Hf-Ta-C-N system was first trained,and then applied to search for the highest melting point material by molecular dynamics(MD)simulation and Bayesian global optimization(BGO).The predicted melting points agree well with the experiments and confirm that carbon site vacancies can enhance the melting point of rock-saltstructure *** solid solution with N is verified as another new and more effective melting point enhancing approach for HfC,while a conventional routing of the solid solution with Ta(e.g.,HfTa_(4)C_(5))is not suggested to result in a maximum melting *** highest melting point(~4236 K)is achieved with the composition of HfCo.638No.271,which is~80 K higher than the highest value in a Hf-C binary *** mechanism of the N addition is believed to be unstable C-N and N-N bonds in liquid phase,which reduces liquid phase entropy and renders the liquid phase less *** improved melting point and less gas generation during oxidation by the addition of N provide a new routing to modify thermal protection materials for the hypersonic vehicles.

关键词： melting point(T_(m)) carbides carbonitrides deep potential(DP) Bayesiannglobal optimization(BGO)

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