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Enhanced high-temperature energy storage density in P-type NiO_x quantum dots and P(VDF-HFP) composite dielectrics

Composites Science and technology 2025年 269卷

作者： Fang, Cheng Zhang, Ziyi Wang, Jian Ye, Zhanwen Li, Kaiyuan Wu, Luoqi Feng, Xiaobin Duan, Bo Dong, Lijie Zhou, Ling Shen, Zhonghui Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Physics and Mechanics Wuhan University of Technology Wuhan 430070 China Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan 430070 China

The harsh application environment poses higher requirements for the operating temperature of dielectric energy storage capacitors. Suppressing carrier transport at high temperatures is a key method to increase the breakdown field strength (E_b) and the operating temperature of dielectrics. In this paper, low-concentration P-type semiconductor nickel oxide quantum dots (NiO_x QDs) were surface modified with polydopamine (PDA) and introduced into the polymer matrix, with the aim to capture hot carriers by constructing hole traps, thereby increasing the high-temperature E_b and energy storage density (U_dis) of the polymer. The results confirmed the efficiency of the strategy. At 90 °C, the E_b of the NiO_x@PDA/P(VDF-HFP) film reached 2242.78 kV/cm, and the U_dis reached 2.94 J/cm³, which were 42.41 % and 164.86 % higher than those of the pure P(VDF-HFP) film. Thermal and mechanical analyses indicated that the enhanced E_b and U_dis were mainly attributed to the restriction of the Poole-Frenkel emission within the dielectrics. Together with the enhanced compatibility of the organic-inorganic composite interface, the macro defects of the composites were further suppressed and electrical properties were further increased. This work offers a straightforward and efficient approach for manufacturing high-temperature energy storage dielectrics. © 2025 Elsevier Ltd

关键词： Energy storage density High-temperature breakdown field strength NiOx QDs P(VDF-HFP) Surface modification

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Bio-inspired high-efficiency photosystem by synergistic effects of core-shell structured Au@CdS nanoparticles and their engineered location on{001}facets of SrTiO_(3)nanocrystals

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Journal of materials Science & technology 2023年第5期136卷 159-168页

作者： Wenxuan Wang Wenhao Chi Zhaoyong Zou Pengchao Zhang Kun Wang Ji Zou Hang Ping Jingjing Xie Weimin Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

Natural photosynthesis,which provides a green and high-efficiency energy conversion path by spatial separation of photogenerated carriers through combined actions of molecules ingeniously arranged in an efficient solar nanospace,highlights the importance of rational nanostructure design to realize artificial high-efficiency *** by these unique features,we constructed a high-efficiency ternary photosystem by selectively decorating the{001}facets of 18-facet SrTiO_(3)with Au@CdS photosensitizers via a green photo-assisted *** from the dual-facilitated charge carriers transportation in core-shell structured Au@CdS heterojunction and well-faceted 18-facet SrTiO_(3)nanocrystal,such a photo-catalyst could realize the effective spatial separation of photogenerated electrons and *** expected,the 18-facet SrTiO_(3)/Au@CdS photocatalyst exhibits superior activity in visible-light-driven photocatalytic hydrogen evolution(4.61 mmol h^(−1)g^(−1)),166%improvement in comparison with randomly deposited Au@CdS(1.73 mmol h^(−1)g^(−1)).This work offers new insight into the development of green and high-efficiency photocatalytic systems based on the rational nanostructure design by crystal facet engineering.

关键词： Au@CdS composites Core-shell 18-facet SrTiO_(3) Photogenerated carrier separation Crystal facet engineering Hydrogen production

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Structures of ceramics/metal and ceramics/ceramics core/shell particles by hybridization

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key Engineering materials 2007年 351卷 109-113页

作者： Fu, Z.Y. Fan, Z. Tang, W.J. Zhang, J.Y. Wang, W.M. Wang, H. Wang, Y.C. Zhang, Q.J. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Hybridization is a promising method for core/shell particles by a mechanical shock process involving dry blending and dry impact blending. In this paper, hybridization was used to prepare TiB2/Ni ceramics/metal and TiB2/Al2O3 ceramics/ceramics core/shell particles. The mechanism of the formation and the features of the core/shell particles were analyzed. The nano- Al203 particles can be coated on the surface of micron TiB2 particles directly by hybridization, The sub-micron Al2O3 particles can be coated on the surface of micron TiB2 particles, only with the introducing of PE-wax as transition layer. The mechanical properties of cermet sintered from TiB2/Ni core/shell ceramics/metal particles were compared with that from TiB2/Ni blended particles.

关键词： Ceramic materials

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Direct Evidence of the Relationship between Piezoelectricity and Catalytic Activity

SSRN

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SSRN 2025年

作者： Gao, Wenpeng Zheng, Huashan Luo, Huajie Zhang, Haibo Jo, Wook Xie, Bing School of Power and Energy Jiangxi Key Laboratory of Green General Aviation Power Nanchang Hangkong University Nanchang330063 China Functional Materials and Acousto-optic Instruments Institute School of Instrumentation Science and Engineering Harbin Institute of Technology Harbin150080 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Ulsan44919 Korea Republic of Beijing Advanced Innovation Center for Materials Genome Engineering China State Key Laboratory of Material Processing and Die & Mould Technology China School of Materials Science and Engineering

Piezocatalysis is highly valued for its efficient energy conversion and environmental capabilities. However, the fundamental connection between piezoelectricity and piezocatalytic activity remains to be thoroughly investigated. Herein, piezoceramic thin flakes with varying levels of piezoelectricity were examined to quantitatively assess the impact of the piezoelectric coefficient (d33) on the piezocatalytic activation in energy and environment applications. The piezoceramic flake, 220 μm thick, possessing the highest piezoelectricity (d33 = 1100 pC/N), demonstrated the highest H2O2 yield (572 μM h-1) and the fastest degradation rate (k = 0.0725 min-1) of Rhodamine B (RhB), exceeding the best performance of previously reported ceramic blocks. In contrast, the same thickness flake with the lowest piezoelectricity (d33 = 150 pC/N) exhibited the weakest piezocatalytic performance. By analyzing internal carrier characteristics and simulating carrier migration pathways under an electric field, a quantitative relationship between piezoelectricity and piezocatalytic activity was established. The piezoceramic flake with higher piezoelectricity demonstrated a higher effective free carrier concentration, a larger number of transiently migrating carriers, and a shorter migration distance due to a stronger built-in electric field, resulting in enhanced piezocatalytic activity. This work clearly elucidates the relationship between piezoelectricity and piezocatalytic activity. © 2025, The Authors. All rights reserved.

关键词： Piezoelectricity

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Ultrafine Grain Tungsten Heavy Alloys with Excellent Performance Prepared by Spark Plasma Sintering

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Journal of Wuhan University of technology(materials Science) 2020年第2期35卷 393-398页

作者： ZHANG Jingang WANG Weimin JI Wei HE Qianglong WANG Aiyang TAN Lin YANG Kai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Institute of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China

Ultrafine grain tungsten heavy alloys (WHAs) were successfully produced from the nano-crystalline powders using spark plasma *** present study mainly discussed the effects of sintering temperature on the density,microstructure and mechanical properties of the *** relative density of 98.12% was obtained at 1 050 ℃,and the tungsten grain size is about 871 *** 1 000 ℃-1 200 ℃,the mechanical properties of the alloys tend to first rise and then goes *** SPS,the alloy exhibits improved hardness (84.3 HRA at 1 050 ℃) and bending strength (987.16 MPa at 1 100 ℃),due to the ultrafine-grained *** fracture mode after bending tests is mainly characterized as intergranular or intragranular fracture of W grains,interfacial debonding of W grains-binding phase and ductile tearing of binding *** EDS analysis reveals a certain proportion of solid solution between W and Ni-Fe binding *** good mechanical properties of the alloys can be attributed to grain refinement and solid solution strengthening.

关键词： tungsten heavy alloys ultrafine grain nano-crystalline powders solid solution strengthening spark plasma sintering

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Effect of Nb2O5 on the space-charge conduction of Y2O3-stabilized ZrO2

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SOLID state IONICS 1997年第1-2期99卷 137-142页

作者： Guo, X State Key Laboratory for Synthesis and Processing of Advanced Materials Wuhan University of Technology Wuhan Hubei 430070 People's Republic of China

Up to 1.5 mol% Nb2O5 was added to 9 mol% Y2O3-stabilized ZrO2. According to an XRD analysis, the addition of Nb2O5 did not change the cubic structure of YSZ. As a result of the repulsion effect of the grain-boundary interface and the preferential segregation of Y2O3, the Nb2O5 segregation at the grain boundaries was not detected by EPMA. The resistances were measured by the complex impedance approach in air, Nb2O5 was found to increase the resistance per unit surface area of the grain boundaries. This result suggested that the most likely mechanism of the dissolution of Nb2O5 in YSZ should be Nb2O5 --> 2Nb(Zr) + 2e' + 4O(o)(x) + 1/2 O-2. Despite the Nb2O5 addition, the Arrhenius equation can still be applied to the resistances.

关键词： space-charge conduction ZrO2 Nb2O5 Y2O3

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Machine learning screening and DFT calculations for exploring Cs2Ag0.75X0.25BiCl6 (X=Na, K, Rb) double perovskites as underwater photovoltaic materials

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Solar Energy materials and Solar Cells 2025年 289卷

作者： Chen, Changcheng Han, Zhao Xu, Yaxin Wang, Zhengjun Tuo, Yali Du, Yuxi Yun, Xiongfei Shi, Shaohang Xie, Jiangzhou Gao, Shuli Chen, Wen Dong, Chao Ji, Yuxiao Guan, Xiaoning Liu, Gang Lu, Pengfei School of Science Xi'an University of Architecture and Technology Xi'an710055 China MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter Key Laboratory for Advanced Materials and Mesoscopic Physics of Shaanxi Province School of Physics Xi'an Jiaotong University Xi'an710049 China School of Mechanical and Manufacturing Engineering University of New South Wales SydneyNSW2052 Australia State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China Key Laboratory of Eco Planning & Green Building Ministry of Education Tsinghua University Beijing100080 China

Underwater vehicles, sensors, and autonomous systems heavily rely on stable energy supplies, which remain a key limiting factor in their practical applications. Traditional silicon-based solar cells are restricted in underwater applications due to their low light absorption efficiency and poor mechanical stability. In this study, we employed machine learning to screen perovskite materials with suitable bandgaps and constructed a vacuum-ordered Cs2AgBiCl6 double perovskite model. Subsequently, through first-principles calculations, we systematically investigated the structural, electronic, optical, and mechanical properties of Cs2Ag0.75X0.25BiCl6 (X = Na, K, Rb) double perovskites to assess their potential in underwater photovoltaic devices. The results demonstrate that Cs2Ag0.75X0.25BiCl6 double perovskites exhibit excellent photovoltaic performance, particularly with bandgaps between 1.8 and 2.3 eV, making them ideal for underwater photovoltaic applications. Optical calculations show that these materials have a high light absorption coefficient, reaching up to 1.56×105 cm−1. Cs2Ag0.75Na0.25BiCl6, in particular, achieved a power conversion efficiency of 19.18 % with a bandgap of 1.83 eV, exhibiting high light absorption capacity. In terms of mechanical performance, Cs2Ag0.75Rb0.25BiCl6 displayed significant anisotropy, enhancing its mechanical stability under complex water flow conditions. In conclusion, the vacuum-ordered Cs2Ag0.75X0.25BiCl6 double perovskites exhibit excellent overall performance, providing important theoretical support for the development of efficient and reliable underwater photovoltaic materials. © 2025

关键词： Machinability

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Ab initio study on the anisotropy of mechanical behavior and deformation mechanism for boron carbide

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Chinese Physics B 2017年第4期26卷 362-367页

作者：李君徐爽张金咏刘立胜刘齐文佘武昌傅正义 School of Science Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The mechanical properties and deformation mechanisms of boron carbide under a-axis and c-axis uniaxial compression are investigated by ab initio calculations based on the density functional *** anisotropy is *** a-axis and c-axis compression,the maximum stresses are 89.0 GPa and 172.2 GPa *** a-axis compression,the destruction of icosahedra results in the unrecoverable deformation,while under c-axis compression,the main deformation mechanism is the formation of new bonds between the boron atoms in the three-atom chains and the equatorial boron atoms in the neighboring icosahedra.

关键词： anisotropy ab initio calculation mechanical property deformation mechanism

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Effects of Microstructure Modification on Properties of AIN/BN Composites

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武汉理工大学学报（材料科学版）（英文版） 2008年第1期23卷 121-124页

作者： LI Meijuan ZHANG Lianmeng SHEN Qiang ZHANG Dongming State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Applied Chemistry School of ScienceWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

It is very difficult to prepare full-densified aluminum nitride-boron nitride(AIN/BN)composite ceramics with homogeneous microstructure and high thermal *** plasma sintering(SPS)was used to fully densify the AIN/BN composites in this ***,mechanical properties and thermal conductivity of the SPS sintered AIN/BN composites with 5-30 vol% BN were *** results show that the microstructure of composites is fine and homogenous,and the AIN/BN composites exhibit high mechanical *** promote the growth of AIN grains and modify the distribution of grain boundary in AIN/BN composites,a heat treating methodology was introduced through gas pressure sintering(GPS).This processing was significantly beneficial to enhancing the thermal conductivity of the *** thermal conductivity of AIN/BN composites with 5-30 vol% BN reached 60 W/m K after the samples were treated by GPS.

关键词： AIN/BN composites thermal conductivity microstructure modification

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Exploring the photovoltaic potential of Cs2AgBX6 (B[dbnd]Bi, Sb;X=Br, Cl) double perovskites: A computational study

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materials Chemistry and Physics 2025年 343卷

作者： Tuo, Yali Zhang, Ziyi Guo, Shuangna Xu, Yaxin Wang, Zhengjun Han, Zhao Yun, Xiongfei Shi, Shaohang Xie, Jiangzhou Wang, Songya Dong, Chao Guan, Xiaoning Chen, Changcheng Liu, Gang Lu, Pengfei School of Science Xi'an University of Architecture and Technology Xi'an710055 China MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter Key Laboratory for Advanced Materials and Mesoscopic Physics of Shaanxi Province School of Physics Xi'an Jiaotong University Xi'an710049 China Key Laboratory of Eco Planning & Green Building Ministry of Education Tsinghua University Beijing100080 China School of Mechanical and Manufacturing Engineering University of New South Wales SydneyNSW2052 Australia State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

Double perovskite materials have shown significant potential in addressing the toxicity and instability issues of lead halide perovskites in practical applications. In particular, Cs2AgBX6 (B[dbnd]Bi, Sb;X = Br, Cl) has attracted considerable attention as an efficient and environmentally friendly alternative to lead-based perovskites. In this study, Cs2AgBX6 is selected as the light-absorbing layer for solar cells. Structural calculations reveal that Cs2AgBX6 is an indirect bandgap semiconductor, with a bandgap ranging from 0.9 to 1.8 eV, exhibiting excellent photovoltaic performance, particularly within the visible light absorption range. Specifically, antimony-based perovskites demonstrate an outstanding optical absorption coefficient of 5 × 105 cm−1. Moreover, the Cauchy pressure significantly influences the material's elasticity and brittleness, with empirical results indicating that all four materials possess good elastic properties. The mechanical stability of the materials is described in terms of Young's modulus, Poisson's ratio, and other mechanical parameters. Simulation results for the solar cell show that Cs2AgBX6 achieves a power conversion efficiency (PCE) of up to 14.28 %. Therefore, this study not only demonstrates the immense potential of Cs2AgBX6 in photovoltaic applications but also paves the way for its further development in device applications. © 2025

关键词： Machinability

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