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Sulfur-doped g-C3N4/TiO2 S-scheme heterojunction photocatalyst for Congo Red photodegradation

Chinese Journal of Catalysis 2021年第1期42卷 56-68页

作者： Juan Wang Guohong Wang Bei Cheng Jiaguo Yu Jiajie Fan Hubei Key Laboratory of Pollutant Analysis and Reuse Technology College of Chemistry and Chemical EngineeringInstitute for Advanced MaterialsHubei Normal UniversityHuangshi 435002HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Material Science and Engineering School Zhengzhou UniversityZhengzhou 450001HenanChina

Constructing step-scheme(S-scheme)heterojunctions has been confirmed as a promising strategy for enhancing the photocatalytic activity of composite *** this work,a series of sulfur-doped g-C3N4(SCN)/TiO2 S-scheme photocatalysts were synthesized using electrospinning and calcination *** as-prepared SCN/TiO2 composites showed superior photocatalytic performance than pure TiO2 and SCN in the photocatalytic degradation of Congo Red(CR)aqueous *** significant enhancement in photocatalytic activity benefited not only from the 1D well-distributed nanostructure,but also from the S-scheme ***,the XPS analyses and DFT calculations demonstrated that electrons were transferred from SCN to TiO2 across the interface of the SCN/TiO2 *** built-in electric field,band edge bending,and Coulomb interaction synergistically facilitated the recombination of relatively useless electrons and holes in hybrid when the interface was irradiated by simulated solar ***,the remaining electrons and holes with higher reducibility and oxidizability endowed the composite with supreme redox *** results were adequately verified by radical trapping experiments,ESR tests,and in situ XPS analyses,suggesting that the electron immigration in the photocatalyst followed the S-scheme heterojunction *** work can enrich our knowledge of the design and fabrication of novel S-scheme heterojunction photocatalysts and provide a promising strategy for solving environmental pollution in the future.

关键词： TiO2 nanofiber Sulfur-doped g-C3N4 Step-scheme heterojunction photocatalysis In situ XPS S-scheme mechanism

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Modulation of the Octahedral Structure and Potential Superconductivity of La3Ni2O7 through Strain Engineering

arXiv

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arXiv 2024年

作者： Huo, Zihao Luo, Zhihui Zhang, Peng Yang, Aiqin Liu, Zhengtao Tao, Xiangru Zhang, Zihan Guo, Shumin Jiang, Qiwen Chen, Wenxuan Yao, Dao-Xin Duan, Defang Cui, Tian Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-Sen University Guangzhou510275 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

The recent transport measurement of La3Ni2O7 uncover a "right-triangle" shape of the superconducting dome in the pressure-temperature (P-T) phase diagram. Motivated by this, we perform theoretical first-principles studies of La3Ni2O7 with the pressure ranging from 0 to 100 GPa. Notably, we reveal a pressure dependence of the Ni-dz2 electron density at the Fermi energy (nzEF) that highly coincides with such shape. On this basis, we further explore the electronic structure under uniaxial stress. By tracking the stress response of nzEF , we propose that superconductivity can be achieved by applying only ~ 2 GPa of compression along the c axis. The idea is further exemplified from the perspectives of lattice distortion, band structure, Fermi surface and superconducting phase coherence. We also discuss the possible charge modulation under the stress and provide an insight to the relation between nzEF and the superconducting Tc in La3Ni2O7 system. Our study provides a helpful guide to the future experiment. © 2024, CC BY.

关键词： Band structure

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Bias Voltage Controlled Inversions of Tunneling Magnetoresistance in van der Waals Heterostructures Fe3GaTe2/hBN/Fe3GaTe2

arXiv

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arXiv 2025年

作者： Zhang, Lihao He, Miao Wang, Xiaoyu Zhang, Haodong Han, keying Liu, Yonglai Zhang, Lei Cheng, Yingchun Pan, Jie Qu, Zhe Wang, Zhe MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei230026 China State Key Lab of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China Key Laboratory for Microstructure Material Physics of Hebei Province Yanshan University Qinhuangdao066004 China

We report the bias voltage-controlled inversions of tunneling magnetoresistance (TMR) in magnetic tunnel junctions composed of Fe3GaTe2 electrodes and hBN tunneling barrier, observed at room temperature. The polarity reversal of TMR occurs consistently at around 0.625 V across multiple devices and temperatures, highlighting the robustness of the effect. To understand this behavior, we developed a theoretical model incorporating spin-resolved density of states (DOS) at high energy levels. By adjusting the DOS weighting at different k-points to account for misalignment between the crystal structure of electrodes in experimental devices, we improved agreement between experimental and theoretical inversion voltages. Our results provide valuable insight into the voltage-controlled spin injection and detection in two-dimensional magnetic tunnel junctions, with implications for the development of energy-efficient spintronic devices. © 2025, CC BY.

关键词： Van der Waals forces

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Achieving Wideband Electromagnetic Wave Absorbing Performance for Pmma-Based Composites Foam by Designing the Alternating Directional (Ad) Microporous Structure

SSRN

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SSRN 2023年

作者： Zhou, Danfeng Yu, Zirui Yuan, Huan Luo, Guoqiang Hu, Ruofei Jiang, Xueliang Shen, Qiang Hubei Key Laboratory of Plasma Chemistry and New Materials School of Material Science and Engineering Wuhan Institute of Technology Hubei Wuhan430205 China 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 Department of Food Science & Chemical Engineering Hubei University of Arts and Science Xiangyang441053 China

Good impedance matching and attenuation ability of electromagnetic wave absorbing (EMA) materials are required to broaden the effective absorbing bandwidth (EAB) and lower minimum reflection loss (RLmin), achieving high EMA performance. Here we report a PMMA- based composite foam with alternating and directional (AD) microporous structure with broadened EAB of 3.53 GHz (8.49-12.02 GHz) and lowers RLmin of -19.35 dB, was manufactured via the one-step physical constraint foaming technology. Structural studies reveal that the AD microporous structure can induce the CNTs oriented distribution to improve effective concentration of CNTs, achieving excellent impedance matching. Meanwhile, it can also generate a large number of parallel-plate capacitors among the multiple interfaces to promote interfacial polarization, including enhancement of multiple reflection and scattering of electromagnetic wave at the multiple interfaces, endowing composites foam with high attenuation ability. This study lays the foundation for rational design and synthesis of EMA materials for broadband EMA performance. © 2023, The Authors. All rights reserved.

关键词： Electromagnetic wave absorption

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Influence of Substitution of Different Transition Metal Elements (Mn, Cr, Co) on the Properties of Bi0.88sm0.12feo3-Based Ceramics

SSRN

引用

SSRN 2022年

作者： Liu, Juan Wang, Lejiang Zuo, Jianan Sun, Tu Lai Yu, Zilong Xiang, Lilin Guo, Xiangtai Xu, Dong Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials School of material science and engineering Anhui University of Technology Ma'anshan243002 China Center for Electron Microscopy State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou310014 China

Transition metal elements (M=Mn, Cr, Co, Mn 0.5 Cr 0.5 , Mn 0.5 Co 0.5 , Cr 0.5 Co 0.5 ) modified Bi 0.88 Sm 0.12 FeO 3 (BSF-M) ceramics were synthesized by rapid liquid phase sintering. The effect of different transition metal elements on the structure and characteristics of BiFeO 3 -based ceramic were studied. Structural refinement revealed the coexistence of rhombohedral R3c phase, orthorhombic Pna2 1 phase and a small amount of Pbnm phase of all samples, and the element type had little effect on the phase composition. According to the XPS analysis, Co and Mn elements can be regarded as hard additives, and Cr element can be regarded as soft additives. Due to the different electronic structures of transition metal elements, different element substitutions have different effects on the electrical and magnetic properties of BiFeO 3 . The results show that the addition of Cr improved the electrical properties of BSF-based ceramics, and the best ferroelectric properties obtained in the BSF-Cr sample, where P r =18.30 μC/cm 2 . The magnetic properties of Co substituted samples are significantly improved, and the maximum remanent magnetization obtained in the BSF-Co sample, where M r =110.8 emu/mol, which may be attributed to the collinear magnetic structure induced by Co-substitution. Finally, the simultaneously enhanced ferroelectric and magnetic properties were obtained in the Cr and Co co-substituted composition BSF-Cr 0.5 Co 0.5 , where P r =10.82 μC/cm 2 , M r =73.3 emu/mol. Multiple ion substitution is a very effective method to optimize the properties of BiFeO 3 . © 2022, The Authors. All rights reserved.

关键词： Bismuth compounds

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Influence of Substitution of Different Transition Metal Elements (Mn, Cr, Co) on the Properties of Bi0.88Sm0.12FeO3-Based Ceramics

SSRN

引用

SSRN 2022年

作者： Liu, Juan Wang, Le Jiang Zuo, Jia Nan Sun, Tu Lai Yu, Zi Long Xiang, Li Lin Guo, Xiang Tai Xu, Dong Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials School of Material Science and Engineering Anhui University of Technology Ma'anshan243002 China Center for Electron Microscopy State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou310014 China

Transition metal elements (M=Mn, Cr, Co, Mn0.5Cr0.5, Mn0.5Co0.5, Cr0.5Co0.5) modified Bi0.88Sm0.12FeO3 (BSF-M) ceramics were synthesized by rapid liquid phase sintering. The effect of different transition metal elements on the structure and characteristics of BiFeO3-based ceramic were studied. Structural refinement revealed the coexistence of rhombohedral R3c phase, orthorhombic Pna21 phase and a small amount of Pbnm phase of all samples, and the element type had little effect on the phase composition. According to the XPS analysis, Co and Mn elements can be regarded as hard additives, and Cr element can be regarded as soft additives. Due to the different electronic structures of transition metal elements, different element substitutions have different effects on the electrical and magnetic properties of BiFeO3. The results show that the addition of Cr improved the electrical properties of BSF-based ceramics, and the best ferroelectric properties obtained in the BSF-Cr sample, where Pr =18.30 μC/cm2. The magnetic properties of Co substituted samples are significantly improved, and the maximum remanent magnetization obtained in the BSF-Co sample, where Mr =110.8 emu/mol, which may be attributed to the collinear magnetic structure induced by Co-substitution. Finally, the simultaneously enhanced ferroelectric and magnetic properties were obtained in the Cr and Co co-substituted composition BSF-Cr0.5Co0.5, where Pr =10.82 μC/cm2, Mr =73.3 emu/mol. Multiple ion substitution is a very effective method to optimize the properties of BiFeO3 © 2022, The Authors. All rights reserved.

关键词： Iron compounds

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Facile one-step vulcanization of copper foil towards stable Li metal anode

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Science China materials 2020年第9期63卷 1663-1671页

作者： Danqi He Yaqi Liao Zexiao Cheng Xiahan Sang Lixia Yuan Zhen Li Yunhui Huang State Key Laboratory of Material Processing and Die and Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Lithium metal has been regarded as the ultimate anode for next-generation rechargeable batteries with high energy ***,its high reactivity and dendrite growth seriously limit its commercial application,which can be well addressed by realizing uniform Li ***,we report a facile and scalable one-step vulcanization method to modify commercial Cu foil with lithophilic *** in situ formed Cu2S layer can not only promote the homogeneous deposition of Li via its lithophilic nature,but also benefit the formation of a stable solid-electrolyte interphase during initial *** Cu2S-modified Cu current collector realizes dendrite-free Li plating/stripping and thus exhibits stable cycling performance with a high Coulombic efficiency,even with a large capacity of 4 mA h cm^-2.A full-cell consisting of a Cu2S/Cu-Li anode and a LiFePO4 cathode exhibits greatly improved cycling stability and enhanced Coulombic efficiency,demonstrating the effectiveness and practicability of the proposed Cu2S/Cu foil in the field of rechargeable Li metal batteries.

关键词： lithium metal anode current collector lithophilic layer copper sulfide electrochemical performance

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Effect of Magnetic Field Annealing on the Soft Magnetic Properties of Cofesib Ribbon and its Fluxgate Performance

SSRN

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SSRN 2023年

作者： Xu, Jiahui Kang, Shujie Wang, Jian Xu, Feng Shi, Chao Zhang, Kewei Wang, Jiafu Chen, Zhengxiang He, Jun Sun, Zhigang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China China Shipbuilding Industry Corporation 710th Research Institute Yichang443003 China Division of Functional Material Research Central Iron and Steel Research Institute Beijing100081 China

As a key part of fluxgate, the properties of magnetic core determine the performance of fluxgate sensor. We studied the effects of zero magnetic field annealing (ZFA) and longitudinal magnetic field annealing (LFA) on soft magnetic properties, magnetic anisotropy and magnetic domain structure of the Co70Fe5Si15B10 amorphous ribbon and its fluxgate sensor performance. It is found that LFA can effectively modulate the magnetic domain from irregular shape and size to wide regular strip domains. As a result, pinning effect, magnetic anisotropy and coercivity decrease, while the initial permeability increases. And finally, the sensitivity of the fluxgate become higher, and noise become less. The results show that the optimal soft magnetic properties of the ribbons are obtained after LFA at 440 ℃, with the initial permeability of 21020 and the coercivity of 0.2 A/m. We applied a square wave excitation signal of size 30 mA and frequency 2.4 kHz to test the performance of the fluxgates. It is found that the flux gate sensitivity increases from the original 36.54 to 41.82 mV/μT after magnetic field annealing treatment, and the peak-to-peak noise (Noisep-p) value at 10Hz bandwidth in 250 s decreases from the original 5.22 to 2.14 nT. The results show that the LFA treatment of the core has a significant effect on its magnetic properties and fluxgate performance enhancement, and these results have good implications for the construction of high-performance fluxgate. © 2023, The Authors. All rights reserved.

关键词： Magnetic anisotropy

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Preparation and dielectric properties of high reliability Nano-BaTiO3 Co-doped with Tm2O3 and MgO for BME-MLCC application

引用

Ceramics International 2025年

作者： Liu, Haizhou Wang, Zhen Wu, Jianjian Guo, Qinghu Yao, Zhonghua Liu, Hanxing Hao, Hua State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering International School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan 528200 China

BaTiO3 has become the most widely used material in MLCC due to its excellent electrical properties. In this work, BaTiO3-x %Tm2O3 (x = 1, 3, 5, 7) and BaTiO3-5 %Tm2O3-y %MgO (y = 0.2, 0.4, 0.6, 0.8) ceramics were prepared by solid-state method in reducing atmosphere and reduction resistance mechanism and dielectric properties of them were investigated. It is confirmed that the Tm³⁺ ion substitutes the Ti⁴⁺ site and significantly improves the reduction resistance of BaTiO3 ceramics when x ≥ 3 with resistivity up to 10¹⁰ Ω•cm. The grain size of BaTiO3-5 %Tm2O3-y %MgO ceramics is reduced to 176 nm, which is beneficial to increase bias stability. The formation of the “core-shell” structure improves the dielectric temperature stability of BaTiO3-based ceramics and a series of X7R (−55 °C–125 °C, temperature coefficient of capacitance (TCC) ≤ ±15 %) ceramics were obtained when x = 5 and y = 0.2–0.6. When x = 5, y = 0.4, the dielectric constant at room temperature is 1610 with a low dielectric loss of 0.009. Combining XPS and TSDC analyses, the reduction resistance mechanism of BaTiO3-5 %Tm2O3-y%MgO ceramics is attributed to the formation of defect dipoles, [2TmTi^′−VO^··] and [MgTi^″−VO^··], due to the cooperation of acceptor ions.

关键词： Anti-reduction BaTiO3 Dielectric temperature stability Resistivity

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Improved dielectric properties and anti-reducing mechanism of Er/Mg Co-doped BaTiO3-based ceramics produced in reducing atmosphere

引用

Ceramics International 2025年

作者： Zeng, Manting Liu, Xingzhong Hao, Hua Yao, Zhonghua Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

BaTiO3-1.6MnO2-xEr2O3 ceramics (abbreviated as BMT-xEr) and BaTiO3-1.6MnO2-3Er2O3-xMgO ceramics (abbreviated as BEMT-xMg) were prepared under a reducing atmosphere by solid-state synthesis method in this work. The effects of Er/Mg co-doping on phase transformation, microstructure, dielectric properties, and defect were systematically investigated. Research shows that Er-doping reduces the Curie temperature and increases the dielectric constant of BaTiO3 ceramics at low temperatures. Mg-doping refines the grain size and makes the grain size distribution more uniform, which is an important reason for the enhanced bias stability. The substitution of Mg at the B-site generates additional oxygen vacancies which capture free electrons and simultaneously forms defect dipoles. The anti-reducing properties are improved by reducing the carrier concentration. The synergistic effect of co-doping forms defect dipoles such as [MgTi″‐2ErBa∙], [MgTi″‐VO∙∙] and [2ErTi′‐VO∙∙] to enhance dielectric relaxation behavior which is considered to be the reason for the improved dielectric temperature stability. When x = 0.4, optimized dielectric ceramics are obtained with Ε25°C = 1820, tanδ = 0.009, resistivity of 1.0 × 1011 Ω·cm, which meets the EIA X7R standard (−55 °C - 125 °C, TCC ≤ ± 15 %). © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Dielectric properties of solids

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