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Doping strategy on improving the overall cathodic performance of double perovskite LnBaCo_(2)O_(5+σ)(Ln=Pr,Gd)as potential SOFC cathode materials

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Journal of Materiomics 2023年第5期9卷 825-837页

作者： Fangze chen Dacheng Zhou Xueqing Xiong Juntao Pan Donglin Cai Ze Wei xiyong chen Yihui Liu Nengneng Luo Jialin Yan Toyohisa Fujita State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning530004GuangxiChina School of Resources Environment and MaterialsGuangxi UniversityNanning530004GuangxiChina Hubei Key Laboratory of Advanced Technology for Automotive Components&Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan430070HubeiChina

A series of single-phase double perovskite Pr1-xGdxBaCo_(2)-yFeyO_(5+σ)(x=0,0.5 and 1,0≤y≤1)materials were engineered through A/B site co-doping strategy to improve the mechanical,electrical and electrochemical properties as potential cathode materials for the application of intermediate solid oxide fuel cells(IT-SOFCs).The corresponding thermochemical stability,thermal expansion behavior,electrical conductivity and cathodic polarization resistance of the materials were systematically *** was found that the A-site dual lanthanide doped Pr_(0.5)Gd_(0.5)BaCo_(2)O_(5+σ)(PGBCO)exhibits improved electrical conductivity,reduced thermal expansion,and comparatively low electrochemical polarization resistance versus single lanthanide double perovskite,PrBaCo_(2)O_(5+σ)(PBCO)and GdBaCo_(2)O_(5+σ)(GBCO)*** investigation on the effect of B-site Fe-doping on Pr_(0.5)Gd_(0.5)BaCo_(2)-yFeyO_(5)+σ(PGBCF-y,0≤y≤1)reveals that all the PGBCF-y compositions exhibit excellent chemical stability with Gd-doped ceria(GDC)at operating temperatures not higher than 1100℃.Besides,doping of Fe in B-site can effectively reduce the thermal expansion coefficients(TECs)of the Pr_(0.5)Gd_(0.5)BaCo_(2)O_(5)+σceramics at 30e1000℃.And the electrochemical impedance spectra(EIS)results show that the PGBCF-y|GDC|PGBCF-y symmetric cells have acceptable low area specific polarization *** examination of the cathodic polarization and characteristic capacitance from the AC impedance spectra by employing the relaxation time distribution(DRT)method demonstrated that charge transfer is the dominating subprocess for the oxygen transport through the materials.

关键词： Double perovskite Electrical conductivity Thermal expansion Electrochemical polarization Thermochemical stability

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Excellent energy storage performance in Bi_(0.5)Na_(0.5)TiO_(3)-based lead-free high-entropy relaxor ferroelectrics via B-site modification

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Journal of Advanced Ceramics 2024年第3期13卷 345-353页

作者： Kaihua Yang Gengguang Luo Li Ma Ruoxuan Che Zhiyi Che Qin Feng Zhenyong Cen xiyong chen Jiajun Zhou Nengneng Luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China School of Optical and Electronic Information Key Lab of Functional Materials for Electronic Information(B)of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China

Next-generation advanced high/pulsed power capacitors urgently require dielectric materials with outstanding energy storage ***_(0.5)Na_(0.5)TiO_(3)-based lead-free materials exhibit high polarization,but the high remanent polarization and large polarization hysteresis limit their applications in dielectric ***,high-entropy perovskite relaxor ferroelectrics(Na_(0.2)Bi_(0.2)Ba_(0.2)Sr_(0.2)Ca_(0.2))(Ti1-x%Zrx%)O_(3)are designed by adding multiple ions in the A-site and replacing the B-site Ti^(4+)with a certain amount of Zr^(4+).The newly designed system showed high relaxor feature and slim polarization-electric(P-E)***,improved relaxor feature and obviously delayed polarization saturation were found with the increasing of Zr^(4+).Of particular importance is that both high recoverable energy storage density of 6.6 J/cm^(3) and energy efficiency of 93.5%were achieved under 550 kV/cm for the ceramics of x=6,accompanying with excellent frequency stability,appreciable thermal stability,and prosperous discharge *** work not only provides potential dielectric materials for energy storage applications,but also offers an effective strategy to obtain dielectric ceramics with ultrahigh comprehensive energy storage performance to meet the demanding requirements of advanced energy storage applications.

关键词： energy storage density (Bi_(0.5)Na_(0.5))TiO_(3) high-entropy perovskite ceramics polarization saturation relaxor ferroelectrics(RFEs)

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Realizing high low-electric-field energy storage performance in AgNbO_(3) ceramics by introducing relaxor behaviour

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Journal of Materiomics 2019年第4期5卷 597-605页

作者： Kai Han Nengneng Luo Shuaifei Mao Fangping Zhuo xiyong chen Laijun Liu Changzheng Hu Huanfu Zhou Xinpeng Wang Yuezhou Wei Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China Department of Chemistry Tsinghua UniversityBeijing100084China College of Materials Science and Engineering Guilin University of TechnologyGuilin541004China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning530004China

Both sustainable development in environment and safety of high-power systems require to develop a novel lead-free dielectric capacitor with high energy density(Wrec)at low applied electric *** this work,a remarkably high Wrec of 2.9 J/cm^(3) accompanying with energy storage efficiency of 56% was achieved in Ag_(0.9)Sr_(0.05)NbO_(3) ceramic at a low applied electric field of 190 kV/cm,by improving antiferroelectricity and introducing relaxor *** improved anti-ferroelectric stability was attributed to the decreased tolerance factor and average electronegativity difference,while the relaxor behaviour was associated with the increased disordered local structure by ***,the Ag_(0.9)Sr_(0.05)NbO_(3) ceramics also exhibited outstanding temperature stability in energy density with small variation less than 5% over 20-140℃.The results indicate that the Ag_(0.9)Sr_(0.05)NbO_(3) ceramic is a promising candidate for low-electric-field driving capacitors.

关键词： Low applied electric field Energy storage Relaxor behaviour Silver niobate Anti-ferroelectric

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High energy storage density in NaNbO_(3) antiferroelectrics with double hysteresis loop

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Journal of Materiomics 2024年第5期10卷 1026-1035页

作者： Li Ma Zhenpei chen Gengguang Luo Zhiyi Che Chao Xu Dongliang Shan Zhenyong Cen Qin Feng xiyong chen Toyohisa Fujita Ye Zhu Yunya Liu Jing-Feng Li Shujun Zhang Nengneng Luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China School of Chemistry and Chemical Engineering Guangxi UniversityNanning530004China Department of Applied Physics Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan411105HunanChina State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2500Australia

Antiferroelectrics(AFEs)possess great potential for high performance dielectric capacitors,due to their distinct double hysteresis loop with high maximum polarization and low remnant ***,the well-known NaNbO_(3) lead-free antiferroelectric(AFE)ceramic usually exhibits square-like P–E loop related to the irreversible AFE P phase to ferroelectric(FE)Q phase transition,yielding low recoverable energy storage density(Wrec).Herein,significantly improved Wrec up to 3.3 J/cm^(3) with good energy storage efficiency(η)of 42.4% was achieved in Na_(0.7)Ag_(0.3)Nb_(0.7)Ta_(0.3)O_(3)(30Agsingle bond30Ta)ceramic with well-defined double P–E loop,by tailoring the A-site electronegativity with Ag+and B-site polarizability with Ta^(5+).The Transmission Electron Microscope,Piezoresponse Force Microscope and in-situ Raman spectra results verified a good reversibility between AFE P phase and high-field-induced FE Q *** improved stability of AFE P phase,being responsible for the double P–E loop and improved Wrec,was attributed to the decreased octahedral tilting angles and cation *** mechanism was revealed by synchrotron X-ray diffraction and Scanning Transmission Electron *** work provides a good paradigm for achieving double P–E loop and high energy storage density in NaNbO_(3)-based ceramics.

关键词： Sodium niobate Antiferroelectrics Double hysteresis loop Energy storage performance Reversibility

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阻燃纺织品与阻燃法规

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产业用纺织品 2011年第12期29卷 1-6页

作者：陈锡勇常州纺织服装职业技术学院纺织化学工程系常州213164

简述阻燃纺织品的使用必要性,分析阻燃纤维和阻燃纺织品的性能及用途,介绍各国的阻燃法规。

关键词：阻燃纤维阻燃纺织品性能用途阻燃法规

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春小麦耐热性表现及其评价

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中国农业大学学报 2000年第1期5卷 43-49页

作者：陈希勇孙其信孙长征中国农业大学作物学院北京圆明园西路2号中国农业大学(西校区) 100094

以 Seri82× Siete Cerros重组近交系为供试材料 ,对不同高温胁迫环境条件下小麦耐热性的表现以及小麦耐热性的评价方法进行了研究。结果表明 :分期播种能够给春小麦提供全生育期的高温胁迫环境 ;借助塑料大棚人工升温的办法可以模拟大... 详细信息

以 Seri82× Siete Cerros重组近交系为供试材料 ,对不同高温胁迫环境条件下小麦耐热性的表现以及小麦耐热性的评价方法进行了研究。结果表明 :分期播种能够给春小麦提供全生育期的高温胁迫环境 ;借助塑料大棚人工升温的办法可以模拟大田生产条件下籽粒灌浆期的高温胁迫环境。在这些不同的热胁迫环境中 ,供试材料的产量性状都受到严重影响 ,且在耐热性表现显著差异。产量性状和耐热性的相关分析表明 :正常环境条件下产量性状表现与耐热性之间不存在相关关系。不同热胁迫环境条件下 ,基因型之间产量性状的遗传表达亦存在显著差异 ,并与耐热性呈显著的负相关。可以认为采用热感指数和几何平均产量

关键词：春小麦重组近交系高温胁近耐热性抗逆育种

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