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PVDF/6H-SiC composite fiber films with enhanced piezoelectric performance by interfacial engineering for diversified applications

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Journal of Materials Science & Technology 2024年第3期170卷 238-245页

作者： Linlin Zhou Tao Yang Chunyu Guo Kang Wang Enhui Wang Laipan Zhu Hailong Wang Sheng Cao kuo-chih chou Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China

Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential ***,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified ***,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light *** open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF *** effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element *** stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding *** study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.

关键词： 6H-SiC PVDF Multifunctional composite fiber film Energy harvester Stress/temperature/light sensor

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Efficient piezo-catalytic dye degradation using piezoelectric 6H-SiC under harsh conditions

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Rare Metals 2024年第7期43卷 3173-3184页

作者： Lin-Lin Zhou Tao Yang Kang Wang Lai-Pan Zhu En-Hui Wang kuo-chih chou Hai-Long Wang Xin-Mei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110000China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing University of Science and TechnologyBeijing 100083China

The development of novel piezoelectric catalysts against harsh conditions is indeed crucial for improving the piezo-catalytic degradation efficiency of colored organic dyes in *** this work,6H-SiC nanoparticles(NPs)are utilized to piezo-catalytic degrade rhodamine B(RhB)and methylene blue(MB)under ultrasonic vibration for the first *** degradation efficiency of RhB and MB reaches 98.8%and 98.7%within 80 *** piezoelectricity of 6H-SiC is comprehensively analyzed by the piezoresponse force microscope(PFM)and finite element method(FEM).The strong oxidizing active free radicals generated by the continuous piezoelectric polarized electric field of 6H-SiC,i.e.,·O_(2)^(-)and·OH,induce the decomposition reactions of colored organic dyes in *** the dyes are proven to degrade to harmless or less-harmful products gradually during the piezo-catalysis process by high-performance liquid chromatography tandem mass spectrometry(HPLC-MS).Moreover,RhB is also decomposed efficiently by 6HSiC NPs under acidic and alkaline *** results prove the feasibility of 6H-SiC for decomposing common water pollutants under harsh conditions and provide a new perspective for water purification.

关键词： Piezo-catalytic degradation 6H-SiC Rhodamine B(RhB) Methylene blue(MB) Harsh conditions

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General solution model and its new progress

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 577-585页

作者： kuo-chih chou University of Science and Technology Beijing Beijing 100083China

The physicochemical properties of multicomponent systems are involved in all fields of chemistry and have received attention from various related areas such as minerals,metallurgy,material science,environment,biology,and *** present,the relevant data can be obtained by using two major calculation methods,namely,the first principle method and the empirical *** the former has achieved recent great progress,it is still a long way to offer practical data;while the latter has not received progress for almost half a ***,a new method that is theoretically reasonable and accurate in practical application is necessary to obtain practical and precise physicochemical data for ternary and multicomponent *** this paper,a new theoretical model is suggested based on its corresponding binary *** feasibility of this theoretical model is discussed in terms of both theoretical analysis and practical performance.

关键词： multicomponent system physicochemical properties solution model phenomenological theory

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A new model for evaluating the electrical conductivity of nonferrous slag

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 500-504页

作者： kuo-chih chou School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Electrical conductivity of molten slag is an important physicochemical property for designing the refming process in electric smelting furnaces. Though conductivities of many slag systems have been measured, the quantitative relationships of conductivity with slag composition and temperature are still very limited. In this article, the Arrhenius law was used to describe the experimental data of conductivities for CaO-MgO-Al2O3-SiO2, CaO-Al2O3-SiO2, CaO-MnO-AlEO3-SiO2, as well as CaO-MgO-MnO- Al2O3-SiO： systems, and it is found that activation energy can be expressed as a linear function of the content of components, where the optical basicity of slag must be within the range of 0.58 to 0.68.

关键词： electrical conductivity Arrhenius law activation energy optical basicity

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Kinetic study on the reaction between CO_2-CO and wustite using the isotope exchange method

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International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 125-130页

作者： Teng Zhang Xiao-jun Hu kuo-chih chou State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

To investigate the reaction between CO2-CO and wustite using the isotope exchange method at 1073, 1173, 1273, and 1373 K, the experiment apparatus was designed to simulate the fluidized bed. The chemical rate constant was estimated by considering the effect of gas phase mass transfer on the reaction. It is found that the chemical rate constant is inversely decreased with the increase in the ratio of CO2/CO by volume. The activation energy of reaction is in a linear relationship with the ratio of COs/CO by volume, and the average activation energy is 155.37 kJ/mol.

关键词： kinetics isotope exchange rate constants wustite activation energy

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Deoxidation of Molten Steel by Aluminum

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Journal of Iron and Steel Research International 2015年第10期22卷 905-908页

作者： Guo-hua ZHANG kuo-chih chou State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The deoxidation equilibrium of liquid steel was investigated from a new perspective. Dissolved associate MmOn was used to describe the interaction between dissolved M and dissolved oxygen instead of the interaction parameter of Wagner. The concentration of unassociated oxygen could be considered as the activity of oxygen. Or, the percentage of unassociated oxygen in the total dissolved oxygen was the activity coefficient of oxygen. When the content of deoxidizer was low, the dissolved oxygen was mainly composed of the unassociated oxygen, while more and more MxO formed with gradually increasing M content. The present model gave a good description to the aluminum deoxidation equilibrium after considering AlO and Al2O. Furthermore, the higher the con- tent of A1 was, the higher the content of Al2O relative to the content of AlO would be.

关键词： deoxidation equilibrium activity coefficient associated oxygen unassociated oxygen interaction coefficient

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Viscosity and Structure Changes of CaO-SiO_2-Al_2O_3-CaF_2 Melts with Substituting Al_2O_3 for SiO_2

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Journal of Iron and Steel Research International 2016年第7期23卷 633-637页

作者： Guo-hua ZHANG Yu-lan ZHEN kuo-chih chou State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

During the smelting process of the high Al steels,the reaction between SiOin molten slag and dissolved aluminum in liquid steel always takes *** aluminathermic reduction reaction will lead to the substitution of 1mol SiOfor 2/3mol ***,the investigations about the influence of the ratio of AlOto SiOon viscosity and structure changes of mould flux during this process are very *** viscosity variation of CaO-SiO-AlO-CaFv2 melts was studied by changing compositions considering the aluminathermic reduction *** was found that viscosity increased monotonously with gradually increasing the substitution *** to the Raman analysis,the substitution of AlOfor SiOleads to the decrease of non-bridging oxygen but the increase of bridging ***,degree of polymerization and viscosity increase as the substitution extent *** comparing the measured viscosities with the model calculated values,it was found that both the recently developed Zhang′s model and Roboud model could describe the viscosity variation behavior of CaO-SiO-AlO-CaFmelts very well.

关键词： high aluminum steel CaO-SiO_2-Al_2O_3-CaF_2 viscosity Raman spectrum mould flux

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Reaction mechanisms for 0.5Li_2MnO_3 ·0.5LiMn_(0.5)Ni_(0.5)O_2 precursor prepared by low-heating solid state reaction

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International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 856-862页

作者： Dong Li Fang Lian Xin-mei Hou kuo-chih chou School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Physical Chemisitry University of Science and Technology Beijing Beijing 100083 China

Lithium-excess manganese layered oxides, which are commonly described in chemical formula 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2, were prepared by low-heating solid state reaction. The reaction mechanisms of synthesizing precursors, the decomposition mechanism, and intermediate materials in calcination were investigated by means of Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, thermogravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The major diffraction patterns of 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2 powder calcinated at 720℃ for 15 h are indexed to the hexagonal structure with a space group of R3m, and the clear splits of doublets at （006）/（102） and （108）/（110） indicate that the sample adopts a well-layered structure. FESEM images show that the size of the agglomerated particles of the sample ranges from 100 to 300 nm.

关键词： lithium batteries electrode manganese oxide solid state reactions calcination

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High Cr(Ⅵ) adsorption capacity of rutile titania prepared by hydrolysis of TiCl4 with AlCl3 addition

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International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1157-1163页

作者： Shun Wu Xiao-bo He Li-jun Wang kuo-chih chou Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Rutile titania(TiO2)was successfully prepared via hydrolysis of TiCl4 in the presence of *** powders were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),and Brunauer-Emmett-Teller(BET)surface area *** the present system,AlCl3 functions as a nucleating agent and induces the formation of rutile *** influences of HCl and isopropanol concentrations on the purity and morphology of the rutile TiO2 were *** purity of the rutile TiO2 increased with increasing concentration of *** dispersed rutile TiO2 particles with a spherical morphology were obtained when the HCl and isopropanol concentrations were 0.5 and 1 mol·L-1,***,the prepared TiO2 powders were used in adsorption tests of the heavy metal pollutant Cr(Ⅵ).Rutile TiO2 sample S-9 demonstrated greater adsorption performance and a removal efficiency that was greater than 99.95%after60 min of adsorption when the Cr(Ⅵ)concentration was 200 mg·*** maximum adsorption capacity on rutile TiO2 was 28.9 mg·*** work provides an easy path to prepare a high-performance rutile TiO2 adsorbent with potential applications in water pollution treatment.

关键词： rutile titania hydrolysis spherical particles adsorption

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Tunable fabrication of single-crystalline CsPbI_(3) nanobelts and their application as photodetectors

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1030-1037页

作者： Tao Yang Ya-peng Zheng kuo-chih chou Xin-mei Hou Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

Lead halide perovskites have received increasing attention recently as a candidate material in various optoelectronic areas because of their high performance as light ***,we report the growth of CsPbI_(3) nanobelts via a solution process.A single-crystalline CsPbI_(3) nanobelt with uniform morphology can be achieved by controlling the amount of PbI_(2).A single-crystalline CsPbI_(3) nanobelt possesses a mean width,length,and thickness of 100 nm,5μm,and 20 nm,*** this work,photodetectors(PDs)based on individual CsPbI_(3) nanobelts are constructed and found to perform well with an external quantum efficiency and responsivity of 2.39×10^(5)% and 770 A/W,*** PDs also show a high detectivity of up to 3.12×10^(12) Jones,which is at par with that of Si *** PDs developed in this work exhibit great promise in various optoelectronic nanodevices.

关键词： photodetector cesium lead triiodide perovskite nanobelt detectivity

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