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Designing silver niobate-based relaxor antiferroelectrics for ultrahigh energy storage performance

Journal of Advanced Ceramics 2024年第8期13卷 1282-1290页

作者： Zhengdong Hu Zhen Liu Bing Han Haonan Peng Kai Da Zequan Xu Zhengqian Fu Zhigao Hu Genshui Wang Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

AgNbO_(3)(AN)and modified AgNbO_(3) have been extensively investigated as promising lead-free antiferroelectric(AFE)energy storage *** studies have focused mainly on the use of an ion dopant at the A/B site to obtain a stabilized AFE phase;however,simultaneous improvements in the recoverable energy storage density(Wrec)and efficiency(n)are stll difficult to ***,we innovatively constructed a AgNbO_(3)-NaNbO_(3)-(Sr_(0.7)Bi_(0.2))TiO_(3)(AN-NN-SBT)ternary solid solution to achieve a relaxor AFE in AgNbO_(3)-based *** coexistence of antiferroelectric(M3)and paraelectric(O)phases in 0.8(0.7AgNbO_(3)-0.3NaNbO_(3))-0.2(Sro.7Bio.2)TiO_(3) confirms the successful realization of a relaxor AFE,attributed to multiple ion occupation at the A/B ***,a high Wrec of 7.53 ***^(-3) and n of 74.0% are acquired,together with superior stability against various temperatures,frequencies,and cycling ***,a high power density(298.7 MW·cm^(-3))and fast discharge speed(41.4 ns)are also demonstrated for the AgNbO_(3)-based relaxor *** work presents a promising energy storage AgNbO_(3)-based ternary solid solution and proposes a novel strategy for AgNbO_(3)-based energy storage via the design of relaxor AFE materials.

关键词： AgNbO_(3)(AN)-based ceramics relaxor antiferroelectric(RAFE) paraelectric(PE) energy storage performance

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Structural origin of enhanced storage energy performance and robust mechanical property in A-site disordered high-entropy ceramics

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Rare Metals 2025年第1期44卷 551-564页

作者： Shuai Chen Ting Wang Xiao-Ling Wang Kai Li Qing-Feng Zhu Wei-Ping Gong Ge Liu Qing-Yuan Wang Shao-Xiong Xie Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou UniversityHuizhou 516001China School of Mechanical Engineering Chengdu UniversityChengdu 610106China Institute for Advanced Study Chengdu UniversityChengdu 610106China Department of Mechanical Engineering Kyushu UniversityFukuoka 819-0395Japan

High-entropy perovskite ferroelectric materials have attracted significant attention due to their remarkably low remnant polarizations and narrow ***,these materials offer high-energy density and efficiency,making them suitable for energy storage *** significant advancements in experimental research,understanding of the properties associated with structure remains *** study aims to study the structural,electric,and mechanical performances at various scales of the high-entropy(Na_(0.2)Bi_(0.2)Ca_(0.2)Sr_(0.2)Ba_(0.2))TiO_(3)(NBCSB)*** results of first-principles calculations indicated that the pseudo-intralayer distortion was obviously smaller compared to the interlayer *** the various bonds,Bi-O,Ca-O,and Na-O experienced the greatest ***,the hybridization between O 2p and Ti 3d states with Bi 6p states was particularly strong,affecting both the ferroelectric polarization and relaxor *** NBCSB materials produced using a typical solid-state process demonstrated exceptional performance in energy storage with a recoverable density of 1.53 J·cm^(-3)and a high efficiency of 89%when subjected to a small electric field of 120 kV·cm^(-1).In addition,these ceramics displayed a remarkable hardness of around 7.23 *** ceramics exhibited exceptional relaxation characteristics with minimal hysteresis and low remanent polarization due to its nanoscale high dynamic polarization configuration with diverse symmetries(rhombohedral,tetragonal,and cubic)resulting from randomly dispersed A-site *** excellent mechanical property is related to the dislocation-blocking effect,solid solution strengthening effect,and domain boundary *** findings of this study offer a comprehensive and novel perspective on A-site disordered high-entropy relaxor ferroelectric ceramics.

关键词： High entropy Crystal distortion Na_(0.2)Bi_(0.2)Ca_(0.2)Sr_(0.2)Ba_(0.2)TiO_(3) Polar nanoregions(PNRs) Hardness Energy storage property

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Lighting up rotaxanes with AIEgens

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Chinese Chemical Letters 2023年第3期34卷 122-133页

作者： Xiao-Qin Xu Xu-Qing Wang Wei Wang School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200062China Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou 510640China

Aiming at the construction of novel rotaxanes with desired luminescent properties for practical applications, recently the rapid development of rotaxanes decorated with aggregation-induced emission(AIE) luminogens(i.e., AIEgens) has been witnessed. The combination of AIEgens and rotaxanes leads to the successful construction of a novel type of luminescent rotaxanes with many attractive features. In particular, the unique controllable dynamic feature of rotaxanes endows the resultant AIEgen-based rotaxanes precisely tunable emissions under external stimuli, leading to the construction of a novel type of smart luminescent materials. In this minireview, the recent progress of AIEgen-based rotaxanes has been summarized, with an emphasis on the design strategy and potential applications.

关键词： Mechanically interlocked molecules Aggregation-induced emission Molecular shuttles F?rster resonance energy transfer Light harvesting Aggregate

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Cardiomyocyte-targeted anti-inflammatory nanotherapeutics against myocardial ischemia reperfusion (IR) injury

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Nano Research 2022年第10期15卷 9125-9134页

作者： Min Lan Mengying Hou Jing Yan Qiurong Deng Ziyin Zhao Shixian Lv Juanjuan Dang Mengyuan Yin Yong Ji Lichen Yin Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Department of Cardiothoracic Surgery Wuxi People’s Hospital Affiliated to Nanjing Medical UniversityWuxi 214023China

Myocardial ischemia reperfusion(IR)injury is closely related to the overwhelming inflammation in the ***,cardiomyocyte-targeted nanotherapeutics were developed for the reactive oxygen species(ROS)-ultrasensitive co-delivery of dexamethasone(Dex)and RAGE small interfering RNA(siRAGE)to attenuate myocardial ***,a ROSdegradable polycation based on PGE2-modified,PEGylated,ditellurium-crosslinked polyethylenimine(PEI)was developed to surface-decorate the Dex-encapsulated mesoporous silica nanoparticles(MSNs),which simultaneously condensed siRAGE and gated the MSNs to prevent the Dex *** intravenous injection to IR-injured rats,the nanotherapeutics could be efficiently transported into the inflamed cardiomyocytes via PGE2-assisted recognition of over-expressed E-series of prostaglandin(EP)receptors on the cell ***,the over-produced ROS degraded PPTP into small segments,promoting the release of siRAGE and Dex to mediate effective RAGE silencing(72%)and cooperative antiinflammatory *** a consequence,the nanotherapeutics notably suppressed the myocardial fibrosis and apoptosis,ultimately recovering the systolic ***,the current nanotherapeutics represent an effective example for the codelivery and on-demand release of nucleic acid and chemodrug payloads,and might find promising utilities toward the synergistic management of myocardial inflammation.

关键词： small interfering RNA(siRNA)delivery reactive oxygen species(ROS)responsiveness ditellurium-crosslinked polyethylenimine(PEI) myocardial ischemia reperfusion injury anti-inflammation

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Unconventional Organic Low-Dimensional Crystals:Diversity and Potential Applications

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CCS Chemistry 2024年第7期6卷 1628-1653页

作者： Jin Feng Mao Sun Ying-Xin Ma Zhen-Yu Geng Chuan-Zeng Wang Shu-Ping Zhuo Shu-Hai Chen Hong-Tao Lin Xue-Dong Wang School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255000 School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255000 Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123

Organic low-dimensional crystals have garnered escalating interests in the realms of miniaturized optoelectronics and integrated *** continual expansion of molecular systems and improvement in experimental conditions have given rise to unconventional organic low-dimensional crystals,which showcase a variety of appealing structure-dependent properties in the realm of organic semiconductors,owing to their adaptable physicochemical characteristics and exceptional optoelectronics ***,the development of unconventional low-dimensional crystals is filled with abundant possibilities due to their diverse application ***,we present a comprehensive overview of advancements in research on representative cases of unconventional low-dimensional organic crystals,using a systematic and rational structural ***,we have also discussed the existing challenges and future directions,aspiring to deepen understanding and encourage further research exploration in this field.

关键词： organic semiconductor crystal growth precise synthesis noncovalent interaction integrat-ed photonics

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Enhanced Intertwined Spin and Charge Orders in the t–J Model in a Small J Case

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Chinese Physics Letters 2023年第3期40卷 41-44页

作者：张渝梅佳伟陈伟强 Department of Physics and Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

The one-band t–J model captures strong correlations in cuprate high-temperature *** accounts for the various intertwined spin and charge orders,and the superconductivity in the phase *** see the correlation effect on the intertwined orders,we implement the density matrix renormalization group method to simulate the t–J model in a small J case with t/J=10,which is in a deeper Mott region than that with t/J?3 in cuprate superconducting *** examine the results on a six-leg lattice with both the nearest and next-nearest-neighbor hoppings and antiferromagnetic coupling,and find the absence of superconductivity and enhanced intertwined spin and charge orders in the phase *** the stripe phases,we find a new SDW+CDW phase in which the spin modulation is a(π,π)antiferromagnetism,while the wavelength of the charge modulation is shorter than that of the stripe *** results suggest the enhanced intertwined orders and suppressed superconductivity in the deep Mott region.

关键词： compounds orders superconductivity

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Carbon dots regulate the interface electron transfer and catalytic kinetics of Pt-based alloys catalyst for highly efficient hydrogen oxidation

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Journal of Energy Chemistry 2022年第3期31卷 61-67,I0003页

作者： Jie Wu Yunjie Zhou Haodong Nie Kaiqiang Wei Hui Huang Fan Liao Yang Liu Mingwang Shao Zhenhui Kang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123JiangsuChina Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipa 999078Macao SARChina

The regulation of interface electron-transfer and catalytic kinetics is very important to design the efficient electrocatalyst for alkaline hydrogen oxidation reaction(HOR).Here,we show the Pt-Ni alloy nanoparticles(PtNi_(2))have an enhanced HOR activity compared with single component Pt ***,the interface electron-transfer kinetics of PtNi_(2)catalyst exhibits a very wide electron-transfer speed *** combined with carbon dots(CDs),the interface charge transfer of PtNi_(2)-CDs composite is optimized,and then the PtNi_(2)-5 mg CDs exhibits about 2.67 times and 4.04 times higher mass and specific activity in 0.1 M KOH than that of 20%commercial Pt/*** this system,CDs also contribute to trapping H^(+)and H_(2)O generated during HOR,tuning hydrogen binding energy(HBE),and regulating interface electron *** work provides a deep understanding of the interface catalytic kinetics of Pt-based alloys towards highly efficient HOR catalysts design.

关键词： Pt-based alloys Carbon dots Interface electron transfer Interface catalytic kinetics Hydrogen oxidation reaction

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A promising controllable CO_(2)capture and separation materials for CO_(2)/CH_(4)/H_(2)under electric field

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Chinese Chemical Letters 2023年第5期34卷 587-593页

作者： Chaozheng He Houyong Yang Ling Fu Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices Institute of Environment and Energy CatalysisSchool of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui 741001China

As the greenhouse effect concerns increases,the development of new materials for the efficient capture and separation of CO_(2)gas from gas mixtures has become a matter of *** this study,we performed density functional theory(DFT)calculations to investigate the adsorption and separation behavior of CO_(2)/CH_(4)/H_(2)on the surface of two-dimensional(2D)Al_(2)C materials under positive/negative applied electric *** the absence of an electric field CO_(2)is weakly physisorbed on the Al_(2)C surface,but with the application of an applied electric field,the adsorption state of CO_(2)gradually changes from physical to chemisorption(adsorption energy changes from-0.29 e V to-3.61 e V),while the negative electric field has little effect on the adsorption of CO_(2).We conclude that the C=O bond in adsorbed CO_(2)can be activated under an external electric field(maximum activation of 15%under an external electric field of 0-0.005 a.u.).Only in the presence of an applied electric field of 0.0033 *** temperatures above525 K/675 K can the adsorption/separation reaction of CO_(2)single adsorption and CO_(2)/CH_(4)/H_(2)mixture be *** adsorption/desorption of CO_(2)on Al_(2)C nanosheet in an electric field of 0.003-0.0033 *** all exothermic,which can be easily controlled by switching on/off the electric field without any energy *** capacity of Al_(2)C to capture CO_(2)per unit electric field decreases with increasing CO_(2)concentration,but still has efficient gas separation properties for CO_(2)/CH_(4)/H_(2).Our theoretical results could provide guidance for designing high-capacity and high-selectivity CO_(2)capture materials.

关键词： CO_(2)capture Electric-field controlled CO_(2)/CH_(4)/H_(2)mixture sequestration Density functional theory Two-dimensional materials

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Immobilization of Oxyanions on the Reconstructed Heterostructure Evolved from a Bimetallic Oxysulfide for the Promotion of Oxygen Evolution Reaction

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Nano-Micro Letters 2023年第10期15卷 547-564页

作者： Kai Yu Hongyuan Yang Hao Zhang Hui Huang Zhaowu Wang Zhenhui Kang Yang Liu Prashanth W.Menezes Ziliang Chen Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon‑Based Functional Materials and DevicesJoint International Research Laboratory of Carbon‑Based Functional Materials and DevicesSoochow UniversitySuzhou 215123People’s Republic of China Department of Chemistry:Metalorganics and Inorganic Materials Technical University of BerlinStrase Des 17 Juni 135.Sekr.C210623 BerlinGermany Materials Chemistry Group for Thin Film Catalysis–CatLab Helmholtz-Zentrum Berlin fur Materialien und EnergieAlbert‑Einstein‑Str.1512489 BerlinGermany School of Physics and Engineering Longmen LaboratoryHenan University of Science and TechnologyLuoyang 471023People’s Republic of China

Efficient and durable oxygen evolution reaction(OER)requires the electrocatalyst to bear abundant active sites,optimized electronic structure as well as robust component and mechanical ***,a bimetallic lanthanum-nickel oxysulfide with rich oxygen vacancies based on the La_(2)O_(2)S prototype is fabricated as a binder-free precatalyst for alkaline *** combination of advanced in situ and ex situ characterizations with theoretical calculation uncovers the synergistic effect among La,Ni,O,and S species during OER,which assures the adsorption and stabilization of the oxyanion SO_(4)^(2-)onto the surface of the deeply reconstructed porous heterostructure composed of confining Ni OOH nanodomains by La(OH)_3 *** coupling,confinement,porosity and immobilization enable notable improvement in active site accessibility,phase stability,mass diffusion capability and the intrinsic Gibbs free energy of oxygen-containing *** optimized electrocatalyst delivers exceptional alkaline OER activity and durability,outperforming most of the Ni-based benchmark OER electrocatalysts.

关键词： Lanthanum-nickel oxysulfide Rare earth metal Immobilization of oxyanions Structural reconstruction Oxygen evolution catalysis

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Effects and regulation mechanisms of post-sinter annealing treatment on magnetic properties and microstructures of Nd-Fe-B sintered magnets with varying boron contents

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Journal of materials Science & Technology 2024年第14期181卷 63-70页

作者： Qingfang Huang Qingzheng Jiang Kexiang Zhong Dakun Chen Deqin Xu Dawei Shi Gang Fu Junlin Yan Sajjad Ur Rehman Qiang Ma Renhui Liu Zhenchen Zhong Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices&College of Rare Earths Jiangxi University of Science and TechnologyGanzhou341000China Institute of Rare Earth Magnetic Material Xiamen Tungsten Co.LtdXiamen361010China Fujian Key Laboratory for Rare Earth Functional Materials Longyan366300China Ganjiang Innovation Academy Chinese Academy of ScienceGanzhou341000China National Rare Earth Function Materials Innovation Center Ganzhou341000China

In traditional Nd-Fe-B-based sintered magnets,the composition,role of each element and microstruc-tures have been extensively investigated globally since they were invented in ***,the effects of boron(B)content and post-sinter annealing(PSA)on the microstructure and magnetic properties have been least studied so far and the relative mechanisms are not yet *** this paper,we investigated the influence of B on the magnetic performance and microstructure of Nd-Fe-B sintered magnets origi-nally containing copper(Cu),gallium(Ga)and titanium(Ti).It is shown that the intrinsic coercivity has a substantial increment of 2.86 kOe and the remanence has a slight reduction of 0.16 kGs when B content is reduced from 0.980 wt.%to 0.900 wt.%.Moreover,there is a coercivity increment of 27.3%and 65.3%for samples with 0.980 wt.%and 0.900 wt.%B content after PSA,*** is shown that the im-pacts of B content and PSA are significant and their regulation mechanisms are worthwhile to be studied ***,it is revealed by microstructural analysis that high coercivity of the sample with 0.900 wt.%B after PSA results from the uniform distribution of Ga,Cu,Nd,and the formation of RE 6(Fe,M)14(RE=Pr,Nd,M=Cu,Ga)compound in triple junction *** dilution of Fe content in grain boundary phases(GB phases)also plays an important *** is found out that decrease of the re-manence is mainly due to reduction of the matrix phase and c-axis alignment *** this study,we explored a new path to develop Nd-Fe-B-based sintered magnets with high comprehensive properties by novel approaches through varying B content,PSA technique and co-adding trace elements.

关键词： Magnetic property RE_(6)(Fe,M)_(14) compound Nd-Fe-B sintered magnets Post-sinter annealing Regulation mechanism

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