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Thermoelectric properties of phase separated Ti substituted Zr0.75Hf0.25NiSn0.985Sb0.015 half-Heuslers

Progress in Natural Science:materials International 2020年第1期30卷 74-79页

作者： Rizwan Akram Yonggao Yan Mozaffar Hussain Xiaoyu She Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Physics Air University

Sb is a very effective dopant for ZrNiSn based half-Heusler *** effect of Ti substitution on Zr0.75Hf0.25NiSn0.985Sb0.015half-Heusler（HH） semiconductor alloys has been investigated to explore the structural modifications and composition ***0.25Zr0.75-xNiSn0.985Sb0.015（x=0,0.15,0.30,0.45） alloys were synthesized by induction melting.A set of samples was also annealed for comparative *** samples were then sintered using plasma activated sintering（PAS） *** results confirmed the existence of ZrNiSn type HH *** electron（BSE） images showed phase separations in the *** substitution improved the carrier concentration and electrical conductivity of the ***,thermal conductivity was also significantly reduced due to the enhanced phonon ***,a ZT value of 1.11 at 873 K was obtained for 30% Ti substituted（annealed） sample.

关键词： Half-Heuslers Doping Sintering Thermoelectric Mobility

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"Environmental phosphorylation"boosting photocatalytic CO_(2)reduction over polymeric carbon nitride grown on carbon paper at air-liquid-solid joint interfaces

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Chinese Journal of Catalysis 2021年第10期42卷 1667-1676页

作者： Qinghe Zhang Yang Xia Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

The limited CO_(2)content in aqueous solution and low adsorption amount of CO_(2)on catalyst surface lead to poor photocatalytic CO_(2)reduction activity and ***,the design and fabrication of a novel photocatalytic architecture is reported,accomplished via chemical vapor deposition of polymeric carbon nitride on carbon *** as-obtained samples with a hydrophobic surface exhibit excellent CO_(2)transport and adsorption ability,as well as the building of triphase air-liquid-solid(CO_(2)-H_(2)O-catalyst)joint interfaces,eventually resulting in the inhibition of H2 evolution and great promotion of CO_(2)reduction with a selectivity of 78.6%.The addition of phosphate to reaction environment makes further improvement of CO_(2)photoreduction into carbon fuels with a selectivity of 93.8%and an apparent quantum yield of 0.4%.This work provides new insight for constructing efficient photocatalytic architecture of CO_(2)photoreduction in aqueous solution and demonstrates that phosphate could play a key role in this process.

关键词： Photocatalytic CO_(2)reduction Hydrophobic surface Air-liquid-solid triphase interfaces Mass transport Phosphorylation

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Effects of TMAH dispersant on rheological behavior of Nd: YAG slurries and optical properties of transparent ceramics 17

Effects of TMAH dispersant on rheological behavior of Nd: YA...

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17th National Conference on Laser technology and Optoelectronics

作者： Luo, Peng Guo, Ruisong Xin, Yu Wang, Yaozhi Zhao, Wenhai Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and Engineering Tianjin University Tianjin300350 China The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430079 China School of Material Science and Engineering Shanghai University Shanghai200444 China

ISBN: (纸本)9781510661097

In this study, transparent Nd: YAG ceramic was fabricated by gel casting of iso bam system using a dispersant composed of tetramethylammonium hydroxide (TMAH) to modify the rheological properties of slurry. The effects of dispersant content on the dispersibility and viscosity of slurry were studied, as well as the microstructure and light transmittance of the obtained transparent ceramics were also analyzed through the introduction of 0 − 1.5 wt.% TMAH. The results showed that the dispersion mechanism of TMAH is mainly to control the electrostatic property and the alkaline Zeta potential value of the slurry. The electrostatic repulsion of ceramic particles in the slurry could be effectively increased through the dispersing action of the additive, thereby reducing the viscosity of the slurry and improving the fluidity of the slurries. Under the TMAH content of 1 wt.%, a high-fluidity and good dispersion of Nd: YAG slurry with a solid load of 78.8 wt.% was obtained. A low viscosity of 72.89 mPa·s was achieved under shearing of 100 s-1, and a dense uniform body was obtained by self-gelling reaction. Highly transparent Nd: YAG ceramics were obtained after vacuum reaction sintering at 1780°C for 10 h, with a transmittance of 75.12% at 1064 nm. In all, the TMAH dispersant could effectively improve the molding properties of PIBM single system gel injection molding transparent ceramics. © 2022 SPIE.

关键词： Optical properties

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Er:CaF2 Crystal and Laser Ceramic: a Comparative Study

Er:CaF2 Crystal and Laser Ceramic: a Comparative Study

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2024 advanced Solid state Lasers, ASSL 2024

作者： Normani, Simone Loiko, Pavel Gan, Shiyan Li, Weiwei Mei, Bingchu Benayad, Abdelmjid Jambunathan, Venkatesan Braud, Alain Chen, Weidong Camy, Patrice UMR 6252 CEA-CNRS-ENSICAEN Université de Caen Normandie 6 Boulevard Maréchal Juin Caen14050 Cedex 4 France State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou350002 China

Spectroscopy and mid-infrared laser performance are compared for Er:CaF2 single-crystal and hot-pressed transparent *** 2.8-µm Er:CaF2 crystal laser delivers 0.81 W with 32.6% slope efficiency and outperforms the... 详细信息

关键词： Single crystals

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Flexible high-performance microcapacitors enabled by all-printed two-dimensional nanosheets

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Science Bulletin 2022年第24期67卷 2541-2549,M0004页

作者： Pengxiang Zhang Yushui Fu Xin Zhang Xihua Zhang Bao-Wen Li Ce-Wen Nan Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Chemically exfoliated nanosheets have exhibited great potential for applications in various electronic ***-based processing strategies such as inkjet printing provide a low-cost,environmentally friendly,and scalable route for the fabrication of flexible devices based on functional inks of twodimensional *** this study,chemically exfoliated high-k perovskite nanosheets(i.e.,Ca_(2)Nb_(3)O_(10)and Ca_(2)NaNb_(4)O_(13))are well dispersed in appropriate solvents to prepare printable inks,and then,a series of microcapacitors with Ag and graphene electrodes are *** resulting microcapacitors,Ag/Ca_(2)Nb_(3)O_(10)/Ag,graphene/Ca_(2)Nb_(3)O_(10)/graphene,and graphene/Ca_(2)NaNb_(4)O_(13)/graphene,demonstrate high capacitance densities of 20,80,and 150 nF/cm^(2) and high dielectric constants of 26,*** 200,*** dielectric enhancement in the microcapacitors with graphene electrodes is possibly attributed to the dielectric/graphene *** addition,these microcapacitors also exhibit good insulating performance with a moderate electrical breakdown strength of approximately 1 MV/cm,excellent flexibility,and thermal stability up to 200℃.This work demonstrates the potential of high-k perovskite nanosheets for additive manufacturing of flexible high-performance dielectric capacitors.

关键词： High-k perovskite nanosheets Inkjet printing Microcapacitors Dielectric enhancement Interface effect

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Powder metallurgy of high-entropy alloys and related composites: A short review

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International Journal of Minerals,Metallurgy and materials 2021年第6期28卷 931-943页

作者： Bo-ren Ke Yu-chen Sun Yong Zhang Wen-rui Wang Wei-min Wang Pei-yan Ma Wei Ji Zheng-yi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China

High-entropy alloys(HEAs)have attracted increasing attention because of their unique properties,including high strength,hardness,chemical stability,and good wear *** metallurgy is one of the most important methods used to fabricate HEA *** paper introduces the methods used to synthesize HEA powders and consolidate HEA *** phase transformation,microstructural evolution,and mechanical properties of HEAs obtained by powder metallurgy are *** also address HEA-related materials such as ceramic–HEA cermets and HEA-based composites fabricated by powder metallurgy.

关键词： high-entropy alloys powder metallurgy mechanical alloying consolidation

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Nonsolvent-Induced Electrospun Fibers with Crater-Like Surface and High-Loading Polytriphenylamine-Derived as a Flexible Cathode for Lithium-Ion Batteries

SSRN

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SSRN 2023年

作者： Xiong, Yufeng Li, Yingjiang Hu, Zhengfei Sun, Zhengquan Cheng, Yiliang Zhang, Yang Dong, Lijie Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Fabricating electrodes simultaneously possessing remarkable flexibility, excellent mechanical properties, and high energy density remains a significant challenge in flexible lithium-ion batteries (LIBs). Herein, a series of flexible organic composite films were prepared with high-loading polytriphenylamine (PTPA) and the derivatives (PTPA-PO) as active material, along with carbon nanotubes (CNTs) serving as conductive filler. The fabrication employed the polyethylene oxide (PEO) assisted nonsolvent (or poor solvent) induced phase separation electrospinning (NIPSE) method. Subsequently, the fiber morphology and electrochemical applications of the flexible organic composite films were systematically studied. Notably, the 60% PTPA-PO/20% CNTs/PEO flexible electrode with a high-loading active material of 60 wt% exhibits a significant discharge capacity of 146.6 mAh·g-1 and a favorable discharge platform ~ 3.7 V vs. Li. Furthermore, the inherent flexibility of electrode contributes to efficient and stable transport of ions and electrons, resulting in a fine capacity retention of 93.3% after 100 cycles. The improvement of electrochemical performance can be rationalized by the unique internal conductive network and crater-like surface structure of the fibers formed through the NIPSE method. This work provides an efficient method to fundamentally improve the energy storage performance and flexibility of LIBs. © 2023, The Authors. All rights reserved.

关键词： Electrospinning

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Ultra-High-Performance Aluminum-Based Hybrid Supercapacitors Prepared for Nitrogen-Doped Micro-Mesoporous Carbon Sphere

SSRN

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SSRN 2023年

作者： Sun, Weiyi Xing, Lingli Zhang, Bomian Shi, Wenchao Ren, Jingke Zhang, Xinyu Xiong, Fangyu An, Qinyou State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Xiangyang441000 China

Aluminum-based devices are promising candidates for the next generation of energy storage due to the advantages of high energy density, high safety, and low cost. The aluminum ion batteries (AIBs) are based on the electrochemical intercalation/deintercalation reactions against the electrodes, but the selection of the cathode is limited to present. The cathode reactions of cation-type AIBs are plagued by the poor kinetics of solid-state diffusion from high charge density of Al3+ and anion-type AIBs show poor capacity due to the intercalation of large-sized chloroaluminate (AlCl4−) active ions into the cathode. Here, we deliberately adopted a hybrid capacitor-battery mechanism and employed a nitrogen-doped micro-mesoporous carbon sphere of a high specific area as the cathode and aluminum as the anode to construct an aluminum-based energy storage device. After optimization, it exhibits an excellent discharge capacity of 224 mA h g−1 at a current density of 300 mA g−1, and exceptional cycling performance with a discharge capacity as high as 114 mA h g−1 at 10 A g−1 after 35000 cycles. The ultra-high-performance aluminum-based hybrid supercapacitor (Al-HSC) may lead to a new direction for the development of aluminum-based energy storage devices. © 2023, The Authors. All rights reserved.

关键词： Aluminum

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ZnO-based micromotors fueled by C02:the first example of self-reorientation-induced biomimetic chemotaxis

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国家科学评论（英文版） 2021年第11期8卷 98-105页

作者： Fangzhi Mou Qi Xie Jianfeng Liu Shengping Che Lamya Bahmane Ming You Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Synthetic chemotactic micro/nanomotors are envisioned to actively'seek out'targets by following specific chemicals,but they are mainly powered by bioincompatible fuels and only show pseudochemotaxis (or advanced chemokinesis) due to their weak self-reorientation *** we demonstrate that synthetic ZnO-based Janus micromotors can be powered by the alternative biocompatible fuel of CO2,and further provide the first example of self-reorientation-induced biomimetic chemotaxis using *** ZnO-based micromotors are highly sensitive to dissolved CO2 in water,which enables the corrosion of ZnO to continuously occur by providing H+ through ***,they can autonomously move even in water exposed to air based on ***,they can sense the local CO2 gradient and perform positive chemotaxis by self-reorientations under the phoretic *** discovery opens a gate to developing intelligent micro/nanomotors powered by,and sensitive to,biocompatible atmospheric or endogenous gaseous chemicals for biomedical and environmental applications.

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Enhanced High-Temperature Energy Storage Density in P-Type Niox Quantum Dots and P(Vdf-Hfp) Composite Dielectrics

SSRN

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SSRN 2024年

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 Wuhan430070 China Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China

The harsh application environment imposes higher requirements on the operating temperature of dielectric energy storage capacitors. Suppressing carrier transmission at high temperatures is a critical way to enhance the breakdown field strength (Eb) and the operating temperature of the dielectrics. In this paper, low-concentration nickel oxide quantum dots (NiOx QDs) with P-type defects are introduced into the polymer matrix, and hot carriers are captured by constructing hole traps, thus improving the high-temperature Eb and energy storage density (Udis) of the polymer. The NiOx QDs were synthesized by the chemical precipitation method and were modified with polydopamine (PDA) to prepare P(VDF-HFP)-based composite films. The results show that the NiOx@PDA QDs can effectively enhance the Eb and Udis of the films. What's more, at 90°C, the Eb of the composite film reaches 2242.78 kV/cm, representing a 42.41% increase compared to pure P(VDF-HFP) film (1574.83 kV/cm), and the Udis reaches 2.94 J/cm3, demonstrating an impressive improvement of 164.86% when compared with pure P(VDF-HFP) (1.11 J/cm3). The results confirmed that the P-type NiOx QDs restricted 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 suppressed, and higher Eb and Udis were obtained. This work offers a straightforward and efficient approach for manufacturing high-temperature energy storage dielectrics. © 2024, The Authors. All rights reserved.

关键词： Nanocrystals

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