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Journal of Materiomics 2023年第1期9卷 174-182页

作者： Gajula Prasad Xiongwei Lin Junwei Liang Yingbang Yao Tao Tao Bo Liang sheng-guo lu Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangdong Provincial Key Laboratory on the Functional Soft Condensed MatterSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Dongguan South China Design Innovation Institute Building D-1University Innovation City AreaSongshan LakeDongguan523808China

Intra porous fibrous membranes have enhanced metal ionic adsorption and oil separation abilities than those of intra nonporous fibrous *** this paper,we prepared highly intra porous fibrous poly(vinylidene fluoride)(PVDF)membranes using an innovated water-mediated electrospinning ***-ATR and XRD techniques confirmed the conversion of non-polarα-phase to polarβ-phase in electrospun *** porous fibrous membrane M–16 had adsorbed oil almost 120%and metal adsorption around 15%,12%,5%,13%respectively for Pb^(2+),Cd^(2+),Cu^(2+)and Zn^(2+),which are larger than the counterpart of nonporous M–*** nonporous fibrous membranes have better peak to peak output voltage(Vp-Vp)2 to 3 times than the porous fibrous membranes(M–16).The results show apparent potential applications in wastewater/oil spill treatment as well as piezoelectric sensors.

关键词： poly(vinylidene fluoride) Porous fibrous membrane Metal removal Oil absorption and peak to peak output voltage

Enhanced electrocaloric effect at room temperature in Mn^(2+) doped lead-free(BaSr)TiO_(3) ceramics via a direct measurement

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Journal of Advanced Ceramics 2021年第3期10卷 482-492页

作者： Xiang NIU Xiaodong JIAN Xianyi CHEN Haoxuan LI Wei LIANG Yingbang YAO Tao TAO Bo LIANG sheng-guo lu Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangdong Provincial Key Laboratory of Functional Soft Condensed MatterSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Dongguan South China Design Innovation Institute Dongguan 523808China

(Ba_(1-x)Sr_(x))(MnyTi1-y)O_(3)(BSMT)ceramics with x=35,40 mol%and y=0,0.1,0.2,0.3,0.4,0.5 mol%were prepared using a conventional solid-state reaction *** dielectric and ferroelectric properties were characterized using impedance analysis and polarization-electric field(P-E)hysteresis loop measurements,*** adiabatic temperature drop was directly measured using a thermocouple when the applied electric field was *** results indicate that high permittivity and low dielectric losses were obtained by doping 0.1-0.4 mol%of manganese ions in(BaSr)TiO_(3)(BST)specimens.A maximum electrocaloric effect(ECE)of 2.75 K in temperature change with electrocaloric strength of 0.55 K·(MV/m)^(-1)was directly obtained at~21℃and 50 kV/cm in Ba_(0.6)Sr_(0.4)Mn_(0.001)Ti_(0.999)O_(3) sample,offering a promising ECE material for practical refrigeration devices working at room temperature.

关键词： barium strontium titanate ceramics permittivity dielectric loss electrocaloric effect electrocaloric strength

Enhanced energy-storage density and temperature stability of Pb_(0.89)La_(0.06)Sr_(0.05)(Zr_(0.95)Ti_(0.05))O_(3) anti-ferroelectric thin film capacitor

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Journal of Materiomics 2022年第1期8卷 239-246页

作者： Zhenhua Tang Songcheng Hu Dijie Yao Zeli Li Zhigang Liu Xiaobin guo Biao lu Jingmin Fan Xin-Gui Tang sheng-guo lu Ju Gao School of Physics and Optoelectric Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou510006China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China School of Automation Guangdong University of TechnologyGuangzhou510006China Department of Physics The University of Hong KongPokfulam RoadHong KongChina

As the fundamental energy storage components in electronic systems,dielectric capacitors with high power densities were *** this work,the anti-ferroelectric Pb_(0.89)La_(0.06)Sr_(0.05)(Zr_(0.95)Ti_(0.05))O_(3)(PLSZT)ceramics and thin film capacitor were successfully fabricated by a solid-state reaction route and pulsed laser deposition method,*** ferroelectric,dielectric,energy-storage properties,and temperature stability of anti-ferroelectric PLSZT capacitor were investigated in *** compared with the PLSZT ceramic(energy storage density is 1.29 J/cm^(3) with an efficiency of 78.7%under 75 kV/cm),the anti-ferroelectric PLSZT thin film capacitors exhibited the enhanced energy storage density of 52.6 J/cm^(3) with efficiency of 67.7%under an electric field as high as 2068.9 kV/cm,and the enhanced energy-storage temperature stabilities from room temperature(RT)to more than 200℃ were demonstrated,and the oxygen defects mechanism and size effect were ***,the fast charging(~0.05 μs)and discharging(~0.15 μs)time were certified for the anti-ferroelectric PLSZT film *** findings broaden the horizon for PLSZT anti-ferroelectrics in high energy storage properties and show promising for manufacturing pulse power capacitor.

关键词： PLSZT anti-Ferroelectrics Pulsed laser deposition(PLD) Ferroelectric/dielectric properties Energy storage Temperature stability

Enhancement of solvent uptake in porous PVDF nanofibers derived by a water-mediated electrospinning technique

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Journal of Materiomics 2021年第2期7卷 244-253页

作者： Gajula Prasad Jun-Wei Liang Wei Zhao Yingbang Yao Tao Tao Bo Liang sheng-guo lu Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangzhou510006China Guangdong Provincial Key Laboratory on the Functional Soft Condensed Matter Guangzhou510006China School of Materials and Energy Guangdong University of TechnologyGuangzhou510006China Dongguan South China Design Innovation Institute Building D-1University Innovation City AreaSongshan LakeDongguan523808China

The effect of a N,N-dimethylformamide(DMF)/acetone solvent system(3:7,4:6,5:5,6:4,7:3)and spinning medium(air and water)on the membrane morphology and the structure-property relationship were investigated.A facile method was optimized to generate a porous,polymer-fiber membrane via the combinative effect of electrospinning and thermally inducing phase separation of the DMF/acetone(4:6)solvent system in a water *** attenuated total reflection(ATR)-Fourier transform infrared(FTIR)results showed an increased b-phase compared to the pristine poly(vinylidene fluoride)(PVDF).The XRD and DSC results further confirmed that the co-existing a-and b-phases in the pristine PVDF were converted into a unique b-phase in the electrospun *** addition,the solvent uptake percentage of the DMF/acetone(4:6)solvent system in a water medium(540)is much greater than that in an air medium(320),and over two times better than that of commercial polyethylene(PE)membranes(190).Similarly,the discharge capacity of the PVDF membrane separator prepared with the DMF/acetone(4:6)solvent system in a water medium is higher than that of the air *** enhancement of solvent uptake might be due to the interconnected porous morphology present in the water medium.

关键词： Polyvinylidene fluoride Electrospinning Thermally induced phase separation Viscosity Porous fibers Discharge capacity Solvent uptake

LARGE ELECTROCALORIC EFFECT IN RELAXOR FERROELECTRICS

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Journal of Advanced Dielectrics 2012年第3期2卷 19-33页

作者： sheng-guo lu QIMING ZHANG Materials Research Institute and Electrical Engineering Department The Pennsylvania State University University Park Pennsylvania 16802USA

Organic and inorganic relaxor ferroelectrics used for electrocaloric effect(ECE)applications *** ferroelectrics offer several advantages for ECE devices,e.g.,infinite stateswithout applying electric field,field-induced large polarization,no-hysteresis ofheating and cooling,small-hysteresis polarization loss,room temperature phase transition,and broad *** ECE in relaxor ferroelectrics under a high electric field can be described using a theorysimilar to that for first-order phase transition *** ECE was observed directly inhigh-energy electron irradiated poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE)68/32 mol%copolymers,P(VDF-TrFE-CFE)(CFE-chlorofluoroethylene)59.2/33.6/7.2 mol%terpolymers,P(vDF-TrFE-CFE)-P(VDF-CTFE)(CTFE-chlorotrifluoroethylene)95/5 wt%terpolymer blended films,and(PbLa)(ZrTi)O_(3)(PLZT)ceramic thin *** reported inPb(Sc_(1/2)Ta_(1/2))O_(3)(PST),Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PMN-PT)thin films is also ***,the perspective of ECE devices is llustrated.

关键词： Electrocaloric effect relaxor ferroelectric polymers relaxor ferroelectric ceramics thinfilms single crystals

Simultaneous achievement of large electrocaloric effect and ultrawide operating temperature range in BaTiO_(3)-based lead-free ceramic

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Journal of Advanced Ceramics 2024年第8期13卷 1234-1241页

作者： Zhaojie Wang Yingzhi Meng Silin Tang Xiang Niu Hongfang Zhang Dingyuan Wang Yisong Bai Bialin Peng Xue Chen Qingqing Ke sheng-guo lu Laijun Liu Guangxi Key Lab of Optical and Electronic Functional Materials and Devices Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of ResourcesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China School of Microelectronics Science and Technology Sun Yat-sen UniversityZhuhai 519082China Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China School of Physical Science and Technology&Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China Qingdao Haier Smart Technology R&D Co. Ltd.Qingdao 266100China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710071China Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing Technology Guilin University of Electronic TechnologyGuilin 541004China

The electrocaloric effect(ECE),known for its environmentally friendly characteristics,holds significant promise for advancing next-generation solid-state refrigeration *** a large ECE along with a wide working temperature range near room temperature remains a key developmental *** this study,we successfully obtained a substantial ECE of 1.78 K and an extensive working temperature range of 103 K(AT>1.52 K)near room temperature in CaZrO_(3)-modified BaTiO_(3) lead-free ferroelectric ***,this achievement was verified using direct *** piezoresponse force microscopy(PFM)results suggest that the broad temperature range is attributed to the formation of ferroelectric microdomains and polar nanoregions(PNRs).Furthermore,X-ray photoelectron spectroscopy(XPS)and ultraviolet-visible(UV-Vis)spectroscopy reveal a decrease in the oxygen vacancy concentration and an increase in the bandgap for higher CaZrO_(3) doping *** changes synergistically enhance the maximum applied electric field,helping to achieve a high-performance EcE near room *** research presents a straightforward and effective approach for achieving high-performance ECEs in BaTiOg lead-free ceramics,offering promising prospects for application in next-generation solid-state refrigeration technologies.

关键词： BaTiO_(3) electrocaloric effect oxygen vacancy band-gap

Large electrocaloric effect obtained in BaSn_(x)Ti_(1-x)O_(3) lead-free ceramics using direct and indirect measurements

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Journal of Advanced Dielectrics 2018年第5期8卷 64-69页

作者： Jiang Li Dan-Dan Li Biao lu Ying-Bang Yao Tao Tao Bo Liang Wen-Hui lu Ge-Li luo sheng-guo lu Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou 510006P.R.China

The electrocaloric effect(ECE)in lead-free BaSn_(x)Ti_(1-x)O_(3)(BSnT,x=0.05,0.10 and 0.15)ceramics were investigated using a direct ECE *** indicate that the maximum ECE occurs near the Curie temperature and it slightly shifts towards high *** directly measured ECE is larger than that calculated using the Maxwell relation and P-E loops.A maximum electrocaloric efficiencyΔT=ΔE=0.49-10-6 KmV-1 was procured for the composition with x=0.15 at T=299.2 *** it also shows a broad peak in the temperature range of 250–320 K.

关键词： BaSnTiO_(3)ceramic direct measurement electrocaloric effect.

Field-driven merging of polarizations and enhanced electrocaloric effect in BaTiO_(3)-based lead-free ceramics

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Journal of Advanced Ceramics 2022年第11期11卷 1777-1788页

作者： Xiang NIU Xiaodong JIAN Weiping GONG Wei LIANG Xuetian GONG Guangzu ZHANG shenglin JIANG Kun YU Xiaobo ZHAO Yingbang YAO Tao TAO Bo LIANG sheng-guo lu Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou UniversityHuizhou 516007China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The 5th Electronics Research Institute of the Ministry of Industry and Information TechnologyGuangzhou 510610China Dongguan South China Design Innovation Institute Dongguan 523808China School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

Solid-state cooling technology based on electrocaloric effect(ECE)has been advanced as an alternative to replace the vapour-compression approach to overcome the releasing of the global warming ***,the development in high ECE materials is still a *** this work,polarization merging strategy was proposed to achieve a large ECE in xBa(Sn_(0.07)Ti_(0.93))O_(3)–(1−x)Ba(Hf_(0.1)Ti_(0.9))O_(3) ferroelectric ceramics,where x=0,0.2,0.4,0.6,0.8,and ***(Sn_(0.07)Ti_(0.93))O_(3) with an orthorhombic phase and Ba(Hf_(0.1)Ti_(0.9))O_(3) with a rhombohedral phase at room temperature were prepared beforehand as precursors,and phase-coexisted xBSnT–(1−x)BHfT ceramics were formed via a solid-state reaction *** coexisting structures were confirmed using the X-ray *** merged polarization was confirmed by the dielectric and ferroelectric *** ECEs were obtained for 0.2BSnT–0.8BHfT ceramics,i.e.,adiabatic temperature change DT=2.16±0.08 K at 80℃and 5 MV/m,and DT=3.35±0.09 K at 80℃and 7 MV/m.

关键词： lead-free ferroelectric microstructure permittivity polarization electrocaloric effect(ECE)

Composition dependence of giant electrocaloric effect in PbxSr1-xTiO_(3) ceramics for energy-related applications

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Journal of Materiomics 2019年第1期5卷 118-126页

作者： Peng-Zu Ge Xiao-Dong Jian Xiong-Wei Lin Xin-Gui Tang Zhi Zhu Qiu-Xiang Liu Yan-Ping Jiang Tian-Fu Zhang sheng-guo lu School of Physics and Optoelectric Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou510006China School of Materials and Energy Guangdong University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou510006China

Pb_(x)Sr_(1-x)TiO_(3)(x=0.30,0.35,0.40,0.45,0.50 and 0.55)ceramics were fabricated by a solid-state reaction *** diffraction data at room temperature show PST samples shift from cubic to tetragonal phase with the increase of Pb^(2+) *** microstructures were observed by scanning electron *** measurement was employed to investigate the ferroelectriceparaelectric phase transition *** dependent polarizationeelectric field hysteresis loops were conducted to study the electrocaloric effect(ECE)of the ferroelectric ceramics by indirect methods over a wide temperature *** measurement of temperature change(DT)at room temperature for all samples can achieve 0.79e1.86 ***'s more,a giant ECE(△T=2.05 K,EC strength(△T/△E)=0.51×10^(-6) K m/V,under 40 kV/cm)was obtained in the sample of x=0.35 near phase transition *** results suggest that the ceramics are promising cooling materials with excellent EC properties for energy related applications.

关键词： Pb_(x)Sr_(1-x)TiO_(3)ceramics Electrocaloric effect Phase transition Energy applications

Synthesis of ternary geopolymers using prediction for effective solidification of mercury in tailings

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Journal of Environmental Sciences 2025年第1期147卷 392-403页

作者： Xuan lu Jinfa guo Fang Chen Mengkui Tian School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China

This study used steel slag,fly ash,and metakaolin as raw materials(SFM materials)to create silica-alumina-based geopolymers that can solidify Hg^(2+)when activated with sodiumbased water *** experiments began with a triangular lattice point mixing design experiment,and the results were fitted,analyzed,and *** optimum SFM material mass ratio was found to be 70%steel slag,25%fly ash,and 5%*** optimum modulus of the activator was identified by comparing the unconfined compressive strength and solidifying impact on Hg^(2+)of geosynthetics with different *** SFM geopolymer was then applied in the form of potting to cure the granulated mercury *** inclusion of 50%SFM material generated a geosynthetic that reduced mercury transport to the surface soil by roughly 90%.The mercury concentration of herbaceous plant samples was also reduced by 78%.It indicates that the SFM material can effectively attenuate the migration transformation of ***,characterization methods such as XPS and FTIR were used to investigate the mechanism of Hg^(2+)solidification by geopolymers generated by SFM *** possible solidification mechanisms were proposed as alkaline environment-induced mercury precipitation,chemical bonding s,surface adsorption of Hg^(2+)and its precipitates by the geopolymer,and physical encapsulation.

关键词： Mercury Geopolymer Solidification Tailings