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Significantly enhanced energy storage performance of BaTiO3-based amorphous thin films through the synergistic function of variable valence ions

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Ceramics International 2025年

作者： Yao, Yiming Tao, Cheng Huang, Rui Zhang, Jian Zhang, Tianyu Hao, Hua Yao, Zhonghua Liu, Hanxing Cao, Minghe State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Amorphous thin films have been widely studied due to the excellent breakdown strength in recent years. However, their practical application faces significant challenges primarily caused by low polarization and energy density. Herein, we propose a multi-variable valence ions doping strategy to enhance the energy storage performance of BaTiO3-based amorphous thin films. The Ba0.92Bi0.08Ti1-x(Ni0.5Mn0.5)xO3(BBTNM) amorphous thin films were fabricated by chemical solution deposition method. In addition, the synergistic effects of variable valence ions (Ni, Mn) on the microstructure, dielectric and energy storage properties of the films were systematically studied. Compared with the undoped Ba0.92Bi0.08TiO3(BBT) film, the polarization and energy storage performance of the BBTNM film have been significantly improved owing to the defect dipoles generated by the incorporation of variable valence ions. Notably, a high discharge energy density of 93.3 J/cm3 together with an energy efficiency of 83 % could be achieved in the x = 0.08 film at 7.05 MV/cm. Simultaneously, the film exhibits excellent thermal stability within the range of 20 °C–160 °C, and still maintains favorable performance after 105 cycles. Overall, this work introduces a new approach for designing BaTiO3-based thin film materials. © 2025

关键词： Amorphous films

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Composite dispersants for the preparation of monodisperse spherical alumina with uniform particle size

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Ceramics International 2025年

作者： Ren, Junbo Huo, Mingda Liu, Pengbo Tan, Ying Li, Minghui Gao, Wei Sun, Xiaohong Guo, Ruisong Zhao, Xinqi School of Materials Science and Engineering State Key Laboratory of Precious Metal Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin300072 China CMP Advanced Materials Co. Ltd Tianjin300459 China

Spherical α-alumina powder has been widely used in advanced alumina ceramics manufacturing due to its excellent sphericity, uniform particle size distribution and good dispersion. However, the small size and fast growth rate of α-alumina precursor particles lead to strong agglomeration during grain growth, making it difficult to obtain uniformly dispersed α-alumina particles with good sphericity. In this study, polyethylene glycol 2000 (PEG2000) and poly (ammonium acrylate) (PAA-NH4) were used as composite dispersants to decrease agglomeration during the preparation of alumina precursors. When the contents of PEG2000 and PAA-NH4 were 0.5 g L−1 and 0.06 g L−1 (S4), respectively, uniformly dispersed alumina precursor particles with good sphericity and a particle size of about 506 nm were obtained, and the morphology remained stable after calcination. After molding and sintering the calcined powders, alumina ceramics with superior mechanical properties were produced. Compared to commercial α-alumina ceramics, flexural strength is increased by approximately 28.9 %, while fracture toughness is increased by approximately 29.2 %. This study offers a new foundation for the development of high-performance alumina powders and ceramics, supporting their engineering applications. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Calcination

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High-entropy alloy nanocrystals boosting photocatalytic hydrogen evolution coupled with selective oxidation of cinnamyl alcohol

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Chinese Journal of Catalysis 2025年第1期68卷 326-335页

作者： Xianglin Xiang Bei Cheng Bicheng Zhu Chuanjia Jiang Guijie Liang Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430078HubeiChina College of Environmental Science and Engineering Nankai UniversityTianjin 300350China Hubei Key Laboratory of Low Dimensional Arts and Science Hubei University of Arts and ScienceXiangyang 441053HubeiChina

Photocatalysis provides a promising solution to the worldwide shortages of energy and industrially important raw materials by utilizing sunlight for coupled hydrogen(H_(2))production with controllable organic ***,we demonstrate that PtFeNiCoCu high-entropy alloy(HEA)nanocrystals can act as efficient cocatalysts for H_(2)evolution coupled with selective oxidation of cinnamyl alcohol to cinnamaldehyde by cubic cadmium sulfide(CdS)quantum dots(QDs)with uniform sizes of 4.0±0.5 *** nanocrystals were prepared via a simple solvothermal approach,and were successfully integrated with CdS QDs by an electrostatic self-assembly method to construct HEA/CdS *** optimized HEA/CdS sample presented an enhanced photocatalytic H_(2)production rate of 7.15 mmol g^(-1)h^(-1),which was 13 times that of pure CdS ***,a cinnamyl alcohol conversion of 96.2%with cinnamaldehyde selectivity of 99.5%was achieved after photoreaction for 3 *** integration of HEA with CdS QDs extended the optical absorption edge from 475 to 484 *** d-band center analysis,Pt atoms in the HEA are the active sites for H_(2)evolution,exhibiting higher catalytic activity than pure ***,the band structure of the CdS QDs enables the oxidative transformation of cinnamyl alcohol to cinnamaldehyde with high ***,femtosecond transient absorption spectroscopy shows that HEA can significantly promote the separation of photogenerated carriers in CdS,which is vital for achieving enhanced photocatalytic *** work inspires atomic-level design of photocatalytic materials for coordinated production of green energy carriers and value-added products.

关键词： Artificial photosynthesis d-Band center Photocatalytic hydrogen evolution Quantum dots Value-added organic synthesis

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Multispectral‐Responsive MXene Nanolayer Energy‐Saving Windows for High‐Absorption electromagnetic Interference Shielding

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Nano Energy 2025年 141卷

作者： Jin, Meng Zhou, Xinfeng Qi, Cheng-Zhang He, Ping Ye, Lvxuan Min, Peng Yu, Zhong-Zhen Zhang, Hao-Bin State Key Laboratory of Organic-Inorganic Composites College of Materials Science and Engineering Beijing University of Chemical Technology Beijing100029 China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical Technology Beijing100029 China

Traditional glass windows, as channels for light, information, and heat exchange, are potential breaches for electromagnetic radiation and temperature regulation. However, materials simultaneously possessing both transparent, high-absorption electromagnetic interference (EMI) shielding and thermal management performances remain scarce. The narrow-band and unstable spectral responses of available transparent materials are the fundamental obstacles. To address these issues, we theoretically unveil the visible opacity (6.9 %/monolayer), high near-infrared transmittance (>80 %) of the Ti3C2Tx MXene nanolayer, and its stable ultra-wideband spectral response across the long-wave infrared, terahertz, and microwave regions. The unique optical characteristics make it possible to regulate multispectral radiation by constructing a radiative regulation (RR) window. Significantly, perfect electromagnetic absorption (≥99 %) and high average absorption (>90 %) are realized for RR windows with excellent EMI shielding and transparency, and the effective absorption region is tunable in the GHz-THz region. Meanwhile, the radiation-transparent MXene nanolayer and infrared-emissive design in the RR window help realize radiative cooling function to avoid heat accumulation, giving an energy-saving performance of 302.4 MJ m−2. This work will open the way to developing a new generation of cross-band technologies for multispectral manipulation. © 2025

关键词： electromagnetic pulse

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Phytic Acid-Modified Black Phosphorus Nanosheets Achieve Ultrahigh Load Bearing and Rapid Superlubrication on Engineered Steel Surfaces

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advanced Functional Materials 2025年

作者： Dong, Shaowen Shi, JunQin Li, Hang Zhang, Rui Ma, XiaoYang Yang, YongFeng Cui, ChunJuan Wang, Wei Li, Jinjin State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China School of Metallurgy Engineering Xi'an University of Architecture and Technology Xi'an710055 China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi'an710072 China

Achieving superlubrication on engineered steel surfaces is critical to reduce friction and wear in mechanical engineering. Herein, a lubricant with rapid superlubrication properties is designed by phytic acid (PA) modified black phosphorus (BP) nanosheets (PA-BP) into a mixture of poly (aspartic acid) (PASP) and ethylene glycol (EG) solution (PASP/EG). It is able to achieve a superlubrication state (µ ≈ 0.0048) at a high contact pressure of 710 MPa on the engineered steel surface and the time to reach superlubrication (tRs) is only 26 s. The addition of PA-BP could reduce wear rate by 96% on the steel surface (1.51×10−10 mm3 N−1 m−1) compared to the lubrication of PASP/EG. The surface analysis and molecular dynamics simulations show that PA-BP nanosheets are easily adsorbed on the steel surface to form an adsorbent tribofilm. These PA-BP nanosheets occur oxidation during the friction process, which could adsorb water molecules in PASP/EG to form a water layer with a thickness of 18 Å. This leads to the transformation of the shear interface into water layer with low shear strength, thus achieving the rapid superlubrication at high contact pressure. This work provides a new idea for the design of rapid macroscopic superlubrication on engineered steel surfaces for industrial applications. © 2025 Wiley-VCH GmbH.

关键词： Nanosheets

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Recent progress on surface chemistryⅡ:Property and characterization

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Chinese Chemical Letters 2025年第1期36卷 8-57页

作者： Xin Li Zhen Xu Donglei Bu Jinming Cai Huamei Chen Qi Chen Ting Chen Fang Cheng Lifeng Chi Wenjie Dong Zhenchao Dong Shixuan Du Qitang Fan Xing Fan Qiang Fu Song Gao Jing Guo Weijun Guo Yang He Shimin Hou Ying Jiang Huihui Kong Baojun Li Dengyuan Li Jie Li Qing Li Ruoning Li Shuying Li Yuxuan Lin Mengxi Liu Peinian Liu Yanyan Liu Jingtao Lü Chuanxu Ma Haoyang Pan JinLiang Pan Minghu Pan Xiaohui Qiu Ziyong Shen Qiang Sun Shijing Tan Bing Wang Dong Wang Li Wang Lili Wang Tao Wang Xiang Wang Xingyue Wang Xueyan Wang Yansong Wang Yu Wang Kai Wu Wei Xu Na Xue Linghao Yan Fan Yang Zhiyong Yang Chi Zhang Xue Zhang Yang Zhang Yao Zhang Xiong Zhou Junfa Zhu Yajie Zhang Feixue Gao Yongfeng Wang Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices School of ElectronicsPeking UniversityBeijing 100871China Spin-X Institute School of MicroelectronicsSouth China University of TechnologyGuangzhou 511442China School of Materials and Energy Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage DevicesGuangdong University of TechnologyGuangzhou 510006China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China i-Lab CAS Key Laboratory of Nanophotonic Materials and DevicesSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts and TelecommunicationsNanjing 210023China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Institute of Physics&University of Chinese Academy of Sciences Beijing 100190China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School

Surface with well-defined components and structures possesses unique electronic,magnetic,optical and chemical *** a result,surface chemistry research plays a crucial role in various fields such as catalysis,energy,materials,quantum,and *** science mainly investigates the correspondence between surface property and *** probe microscopy(SPM)techniques are important tools to characterize surface properties because of the capability of atomic-scale imaging,spectroscopy and manipulation at the single-atom *** this review,we summarize recent advances in surface electronic,magnetic and optical properties characterized mainly by SPM-based *** focus on elucidating theπ-magnetism in graphene-based nanostructures,construction of spin qubits on surfaces,topology properties of surface organic structures,STM-based light emission,tip-enhanced Raman spectroscopy and integration of machine learning in SPM studies.

关键词： Surface chemistry Scanning probe microscopy π-Magnetism Spin qubits Tip-enhanced Raman spectroscopy

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Downlink Performance Analysis of Extremely Large-Scale MIMO-OFDM Systems for High-Speed Railway

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IEEE Transactions on Vehicular technology 2025年

作者： Yi, Wenhui Zhang, Jiayi Wang, Zhe Xiao, Huahua Ai, Bo State Key Laboratory of Advanced Rail Autonomous Operation China Beijing Jiaotong University School of Electronics and Information Engineering Beijing100044 China State Key Laboratory of Mobile Network and Mobile Multimedia Technology ZTE Corporation Shenzhen518055 China

The potential of extremely large-scale multiple-input multiple-output (XL-MIMO) systems to enhance the performance of high-speed railway (HSR) wireless networks is vast. In this correspondence, we examine the performance characteristics of the XL-MIMO-OFDM HSR system, focusing on uniform planar array (UPA) and uniform linear array (ULA) configurations. Considering the multipath spherical wave channel model, we develop a system model that accounts for the Doppler frequency offset (DFO) caused by train movement. Our analysis includes the performance of effective degrees of freedom (EDoF), deriving closed-form expressions for both UPA- and ULA-based systems. Additionally, we investigate the integration of XL-MIMO with orthogonal frequency-division multiplexing (OFDM), which enhances the signal-to-interference plus noise ratio (SINR) and spectral efficiency (SE) of individual base stations. Simulation results demonstrate the superior EDoF performance of UPA- and ULA-based XL-MIMO-OFDM systems. Moreover, the intercarrier interference resulting from train movement increases with speed, and the degradation in signal quality caused by this interference can be mitigated by configuring the XL-MIMO-OFDM system. Notably, the adoption of XL-MIMO technology with a near-field channel model significantly improves coverage reliability compared to traditional MIMO configurations using a far-field channel model. © 1967-2012 IEEE.

关键词： Signal to noise ratio

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Adaptive Hybrid-Field Channel Estimation in THz XL-MIMO Systems

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IEEE Transactions on Vehicular technology 2025年

作者： Lu, Jiayi Zhang, Jiayi Lei, Hao Xiao, Huahua Ai, Bo State Key Laboratory of Advanced Rail Autonomous Operation China Beijing Jiaotong University School of Electronics and Information Engineering Beijing100044 China ZTE Corporation State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen518055 China

In this correspondence, we delve into a hybrid-field channel model for the extremely large-scale multiple-input multiple-output (XL-MIMO) system and formulate the channel estimation problem within a multi-carrier scenario. Additionally, we introduce a near-field prioritized adaptive scheme to address the issue of reliance on prior information regarding the exact numbers of near-field and far-field paths, featuring a noise-level-based stopping criterion. Focusing on narrowband and wideband scenarios, we design two algorithms within this adaptive framework based on the multiple measurement vector model. Numerical results demonstrate that the proposed adaptive hybrid-field channel estimation strategies surpass existing methods in channel estimation accuracy while maintaining low computational complexity. © 1967-2012 IEEE.

关键词： Channel estimation

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Characterization of Guided Waves in Thermal Protection System Using Semi-analytical Finite Element Method 7

Characterization of Guided Waves in Thermal Protection Syste...

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7th International Symposium on Laser Ultrasonics and advanced Sensing, LU 2024

作者： Wang, Hongyuan Zhang, Hengda Wu, Jian Wu, Delin Gao, Shenping Wang, Xiaobo Jin, Pian Xu, Dengfeng Yu, Xingyan Cheng, Kui Yao, Lei Zhejiang Key Laboratory of Acoustic Intelligent Sensing and Advanced Measurement Zhejiang Institute of Quality Sciences Hangzhou310018 China Key Laboratory of Acoustics and Vibration Applied Measuring Technology State Administration for Market Regulation Zhejiang Institute of Quality Sciences Hangzhou310018 China School of Materials Science and Engineering Zhejiang University Hangzhou310058 China Zhejiang Construction Engineering Group Co. Ltd. Hangzhou310013 China

Thermal protection systems (TPSs) are essential to protect reusable hypersonic vehicles from harsh aerothermal environments. This paper investigates guided wave dispersion in TPS using semi-analytical finite element (SAFE) method for further non-destructive testing of the inter-laminar debonding. A theoretical model is developed to describe mode coupling of guided waves between the load-bearing substrate and thermal insulation material. SAFE method is then utilized to obtain 3-D dispersion curves of guided wave modes in typical TPS. Due to the material uncertainty, different damping situations of the thermal insulation material are considered in numerical simulation. Compared with the wavenumber loci of guided wave modes in the load-bearing substrate, those in the intact TPS vary dramatically around the critical frequency due to the coupling effect of the bonded thermal insulation material. Coupling regions of multiple guided wave modes are found under different damping situations. The results show that guided wave modes around the critical frequency are suitable for the evaluation of bonding condition between the load-bearing substrate and thermal insulation material. Overall, the dispersion and attenuation property of guided waves in typical TPS are analyzed. The proposed characterization method provides theoretical support for TPS non-destructive testing using laser-generated guided waves. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Thermal insulation

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Enhanced Visible Light Photocatalytic Activity of BiOCl with Ti_(3)C_(2) Nanosheets for Pollutant Photodegradation

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Journal of Wuhan University of technology(Materials Science) 2025年第3期40卷 650-659页

作者： ZHENG Jingyan DENG Yichao XU Mengying LI Lian TREMBLAY Pier-Luc ZHANG Tian School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Sanya Science and Education Innovation Park Wuhan University of TechnologySanya 572024China Shaoxing Institute for Advanced Research Wuhan University of TechnologyShaoxing 312300China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Chemistry Chemical Engineeringand Life ScienceWuhan University of TechnologyWuhan 430070China

Ti_(3)C_(2)/BiOCl composite was successfully synthesized by combining BiOCl(BOC)with an exposed(110)crystal plane and Ti_(3)C_(2) using a simple hydrothermal *** photocatalytic performance of produced composite was evaluated using the degradation of rhodamine B(RhB)and tetracycline hydrochloride(TCH)under visible *** results demonstrated that Ti_(3)C_(2)/BOC composite had higher photocatalytic activity than pure *** optimum incorporation amount of Ti_(3)C_(2) was 2 wt%.The photodegradation rate of 2 wt%-Ti_(3)C_(2)/BOC at 10 min to 20 mg/L RhB was 97.6%,which was much higher than that of BOC(75.3%).Similarly,the photodegradation rate of 2 wt%-Ti_(3)C_(2)/BOC to 10 mg/L TCH at 30 min was 80.4%,which was higher than BOC(68.1%).In addition,the prepared 2 wt%-Ti_(3)C_(2)/BOC composite also maintained good stability even after four *** impedance spectroscopy(EIS),transient photocurrent response(IT)and ultraviolet-visible diffuse reflectance spectroscopy(UV-vis)confirmed that the photoelectrochemical properties of 2 wt%-Ti_(3)C_(2)/BOC composite were significantly *** the basis of analyzing the action mechanism of photocatalyst,it was pointed out that·O_(2)^(-)and h~+were the main active substances in the photodegradation of RhB and TCH by 2 wt%-Ti_(3)C_(2)/BOC.

关键词： Ti_(3)C_(2)/BiOCl photodegradation rhodamine B tetracycline hydrochloride

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