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Advances in designing heterojunction photocatalytic materials

Chinese Journal of Catalysis 2021年第5期42卷 710-730页

作者： Zongpeng Wang Zhiping Lin Shijie Shen Wenwu Zhong Shaowen Cao School of Advanced Study Taizhou UniversityTaizhou 318000ZhejiangChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina School of Pharmaceutical and Material Engineering Taizhou UniversityTaizhou 318000ZhejiangChina

Under the background of increasing energy crisis and global warming,semiconductor-based photocatalysis has received tremendous attention due to its potential application in green energy production,CO_(2) reduction and pollutant *** photocatalytic activity of semiconductors,however,remains low due to issues like fast recombination of photo-generated electron-hole pairs,limited electron mobility,restricted optical absorption or insufficient active *** appropriate heterojunctions is proved to be a promising method to address most of these issues and thus to improve the photocatalytic *** this review,the working mechanism of various heterojunctions is presented *** most recent advances of strategies in designing and preparing efficient heterojunction photocatalysts are further summarized and some perspectives on the future directions in this field are provided.

关键词： Photocatalyst Heterojunction Renewable energy Charge transfer Redox ability

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Defect Evolution and Effect on Structure and Electric Properties of A/B Site Sm Doped Batio3 Sintered in Different Atmospheres

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SSRN 2022年

作者： Wang, Zhen Hao, Hua Peng, Feng Zhang, Wanying Su, Cong Guo, Qinghu Yao, Zhonghua Cao, Minghe 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 Center for Smart Materials and Device Integration

BaTiO3 ceramics doped with different contents of Sm (0.5-7 mol%) are prepared by a homogeneous precipitation method and sintered in air (A-xSm) and reducing (R-xSm) atmosphere respectively. With the increase of doping amount, the phase structure of Sm-doped BaTiO3 ceramics gradually changes from tetragonal phase to cubic phase, and the cubic phase is stronger in R-xSm. In the air atmosphere, Sm ions preferentially replace Ba sites as donors at low doping concentration, which is easy to convert Ti4+ ions into Ti3+ ions, resulting high dielectric constant (>104) and semiconductor like properties. As the doping amount increases, Sm ions start to replace Ti sites as acceptors to generate oxygen vacancies, which capture the electrons generated by donor doping, thus decreasing the percentage of Ti3+ ions. As a result, the dielectric loss and permittivity are decreased, and the electrical insulation properties of A-xSm ceramics are gradually improved. However, in the reducing atmosphere, oxygen atoms in the lattice are easy to escape, resulting in many oxygen vacancies and free electrons. The increase of oxygen vacancy inhibits the substitution of Sm ion to Ti site, and the free electron leads to the increase the percentage of Ti3+ ions and R-xSm ceramics exhibit semiconductor like properties. Thermally stimulated depolarization currents (TSDC) testing verified that oxygen vacancies of A-xSm ceramics mainly capture space charges, and a small part of oxygen vacancies form defective dipoles. The complex impedance test shows that the change of resistivity of A-xSm ceramics is mainly closed to the influence of Sm doping on the grain not grain boundary of BaTiO3 ceramic. © 2022, The Authors. All rights reserved.

关键词： Oxygen vacancies

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

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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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Recent progress in perovskite solar cells:from device to commercialization

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Science China Chemistry 2022年第12期65卷 2369-2416页

作者： Xinhui Luo Xuesong Lin Feng Gao Yang Zhao Xiaodong Li Liqing Zhan Zexiong Qiu Jin Wang Cong Chen Lei Meng Xiaofeng Gao Yu Zhang Zijian Huang Rundong Fan Huifen Liu Yanrun Chen Xiaoxue Ren Jiahong Tang Chun-Hao Chen Dong Yang Yongguang Tu Xiao Liu Dongxue Liu Qing Zhao Jingbi You Junfeng Fang Yongzhen Wu Hongwei Han Xiaodan Zhang Dewei Zhao Fuzhi Huang Huanping Zhou Yongbo Yuan Qi Chen Zhaokui Wang Shengzhong(Frank)Liu Rui Zhu Jotaro Nakazaki Yongfang Li Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Experimental Center for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Jia

Perovskite solar cells(PSCs) are undergoing rapid development and the power conversion efficiency reaches 25.7% which attracts increasing attention on their commercialization *** this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and ***,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.

关键词： perovskite solar cells device engineering stability application

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

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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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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

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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

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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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Improved ammonia sensing performance of Nd-modified nano-BaTiO3 at room temperature

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Journal of Alloys and Compounds 2025年 1033卷

作者： Hu, Ruize Hao, Hua Cheng, Jingsai Feng, Feiyang Guo, Qinghu 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

In this study, BaTiO3 doped with Nd ions (Ba1-xNdxTiO3, x = 0 ∼ 0.02) nanoparticles were prepared by hydrothermal method, and their gas sensitivity to NH3 at room temperature was investigated. Compared with BaTiO3, the particle size of Nd doped BaTiO3 powder decreases and the specific surface area increases. At the same time, the gas-sensitive performance on NH3 is enhanced, which is mostly due to that the increased concentration of oxygen vacancy and adsorbed oxygen promote the reaction between adsorbed oxygen and NH3. At room temperature, the response value of Ba0.996Nd0.004TiO3 to NH3 gas at 50 ppm is about 54 %, and the response time and recovery time are 11 s and 14 s, respectively. The results show that the excellent NH3 gas sensitive property is obtained for Ba1-xNdxTiO3 nanopowder. The adsorption energy, work function and charge density of Ba1-xNdxTiO3 toward NH3 is studied via density functional theory (DFT) based on first-principle. When doped with Nd ion at low concentration, BaTiO3 will be transformed into n-type semiconductor with the decreasing adsorption energy and increasing the electron transfer between NH3 and its surface, which result in the improved gas sensitivity to NH3 at room temperature. This study provides a new method for the preparation and the design of BaTiO3-based NH3 gas sensor. © 2025 Elsevier B.V.

关键词： Nanoparticles

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