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学者姓名：娄晓杰
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Abstract ：
Barocaloric effects in a layered hybrid organic-inorganic compound, (C10H21NH3)(2)MnCl4, that are reversible and colossal under pressure changes below 0.1 GPa are reported. This barocaloric performance originates in a phase transition characterized by different features: A strong disordering of the organic chains, a very large volume change, a very large sensitivity of the transition temperature to pressure and a small hysteresis. The obtained values are unprecedented among solid-state cooling materials at such low pressure changes and demonstrate that colossal effects can be obtained in compounds other than plastic crystals. The temperature-pressure phase diagram displays a triple point indicating enantiotropy at high pressure.
Keyword ：
barocaloric effects calorimetry hybrid layered perovskites phase diagrams Raman scattering
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| GB/T 7714 | Li, Junning , Barrio, Maria , Dunstan, David J. et al. Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C10H21NH3)(2)MnCl4 under Low Pressure Near Room Temperature [J]. | ADVANCED FUNCTIONAL MATERIALS , 2021 , 31 (46) . |
| MLA | Li, Junning et al. "Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C10H21NH3)(2)MnCl4 under Low Pressure Near Room Temperature" . | ADVANCED FUNCTIONAL MATERIALS 31 . 46 (2021) . |
| APA | Li, Junning , Barrio, Maria , Dunstan, David J. , Dixey, Richard , Lou, Xiaojie , Tamarit, Josep-Lluis et al. Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C10H21NH3)(2)MnCl4 under Low Pressure Near Room Temperature . | ADVANCED FUNCTIONAL MATERIALS , 2021 , 31 (46) . |
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Abstract ：
In materials science, intentional doping has been widely used to improve the properties of a variety of materials. However, such an approach is not yet exploited in the fast-growing field of electrocaloric materials, which represent a serious alternative for next-generation cooling systems. Here we demonstrate with Ba0.9Sr0.1Hf0.1Ti0.9O3, an ecofriendly ferroelectric material, that doping with 2% of Cu introduces defect dipoles into the ferroelectric matrix and results in (i) enhancement of the adiabatic temperature change AT by up to 54% while maintaining performance after a large number (up to 104) of electric field cycles, (ii) suppression of the parasitic irreversibility of AT between on-field and off -field states, and (iii) an alternative design of refrigeration cycle with a prepoled sample, allowing a two-field-step process showing both conventional (AT> 0) and inverse (AT< 0) responses when the field is sequentially varied. We also demonstrate that doping significantly increases the energy storage density (by up to 72%). The defect engineering approach therefore offers a path for designing ferroelectrics with improved electrocaloric performances. Beyond ferroelectrics, this strategy could also be promising in other solid-state caloric materials (magnetocalorics, elastocalorics, etc.).
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| GB/T 7714 | Li, Junning , Lv, Jing , Zhang, Dawei et al. Doping-induced Polar Defects Improve the Electrocaloric Performance of Ba0(0.9)Sr(0.1)Hf(0.1)Ti(0.9)O(3) [J]. | PHYSICAL REVIEW APPLIED , 2021 , 16 (1) . |
| MLA | Li, Junning et al. "Doping-induced Polar Defects Improve the Electrocaloric Performance of Ba0(0.9)Sr(0.1)Hf(0.1)Ti(0.9)O(3)" . | PHYSICAL REVIEW APPLIED 16 . 1 (2021) . |
| APA | Li, Junning , Lv, Jing , Zhang, Dawei , Zhang, Lixue , Hao, Xihong , Wu, Ming et al. Doping-induced Polar Defects Improve the Electrocaloric Performance of Ba0(0.9)Sr(0.1)Hf(0.1)Ti(0.9)O(3) . | PHYSICAL REVIEW APPLIED , 2021 , 16 (1) . |
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Abstract ：
Supercapacitors (SCs) have attracted considerable attention due to their outstanding power density and cycling performance. In this work, the amino-rich surface functional groups (–NH– and –N+H-) surface modified Ti3C2Tx MXene nanosheets (N–Ti3C2Tx-200) are synthesized via the solvothermal method, which is accompanied by the generation of surface titanium atom defects. Moreover, kinetic analysis confirms that the surface amino-rich functional groups are in favor of the rapid hydrogen ions transmission within electrode, leading to an enhancement of capacitive capacitance. Specifically, the flexible N–Ti3C2Tx-200 electrode exhibits a volumetric capacity of 936.0 C cm−3, which is 1.49 times that of the pristine Ti3C2Tx. Further, the modified electrode even can keep a volumetric capacity of 839.7 C cm−3 at 1 V s−1, which is much higher than that of the pristine Ti3C2Tx (277.7 C cm−3). More importantly, the hybrid aqueous proton supercapacitors (HAPSs), constructed by N–Ti3C2Tx-200 anode and copper hexacyanoferrate (CuHCF) cathode, achieve a 2 V wide voltage window and an ultrahigh volumetric energy density of 104.9 Wh L−1 at 0.38 kW L−1. This work offers a basic understanding of the amino-rich surface-modified flexible Ti3C2Tx film electrodes with high volumetric energy density and high-rate performance, providing a strategy to fabricate HAPSs with superior volumetric capacity. © 2021 Elsevier B.V.
Keyword ：
Anodes Capacitance Copper compounds Nanosheets Supercapacitor Surface treatment
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| GB/T 7714 | Tian, Yapeng , Que, Bowen , Luo, Yangyang et al. Amino-rich surface-modified MXene as anode for hybrid aqueous proton supercapacitors with superior volumetric capacity [J]. | Journal of Power Sources , 2021 , 495 . |
| MLA | Tian, Yapeng et al. "Amino-rich surface-modified MXene as anode for hybrid aqueous proton supercapacitors with superior volumetric capacity" . | Journal of Power Sources 495 (2021) . |
| APA | Tian, Yapeng , Que, Bowen , Luo, Yangyang , Ju, Maomao , Tang, Yi , Lou, Xiaojie et al. Amino-rich surface-modified MXene as anode for hybrid aqueous proton supercapacitors with superior volumetric capacity . | Journal of Power Sources , 2021 , 495 . |
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Abstract ：
Developing high-performance dielectric capacitors is essential to meet the growing demands of hybrid electric vehicles and high-power applications. The energy storage efficiency and the temperature-variant energy storage properties should be considered besides the energy density. In this work, we prepared (1 - x)(0.8NaNbO(3)-0.2SrTiO(3)) - xBi(Zn0.5Sn0.5)O-3 (abbreviated as (1 - x)(NN-ST) - xBZS) lead-free ceramics, where ion disorder is induced in the A-B sites. The experimental results indicate that the antiferroelectric orthorhombic R phase is stabilized, and the breakdown strength is enhanced due to the decreased grain size after BZS modification, which are conducive to optimizing the energy storage performance. The piezoresponse force microscopy (PFM) observation reveals that the incorporated BZS promotes the reversibility of domains, resulting in enhanced energy storage efficiency. Therefore, an energy density of 5.82 J cm(-3) and an efficiency of 92.3% are simultaneously obtained in the 0.96(NN-ST) - 0.04BZS composition, and the obtained efficiency in this work reaches a record high in NN-based energy storage ceramics. Especially, the sample displays extraordinary temperature stability, that is, high energy storage density (3.6-4.31 J cm(-3)) and efficiency (90-95%) are achieved in a wide temperature range from -60 degrees C to 180 degrees C. Our work would provide a powerful strategy for designing high-performance energy storage capacitors operating in harsh environments.
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| GB/T 7714 | Kang, Ruirui , Wang, Zepeng , Yang, Weijie et al. Extraordinary energy storage performance and thermal stability in sodium niobate-based ceramics modified by the ion disorder and stabilized antiferroelectric orthorhombic R phase [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (43) : 24387-24396 . |
| MLA | Kang, Ruirui et al. "Extraordinary energy storage performance and thermal stability in sodium niobate-based ceramics modified by the ion disorder and stabilized antiferroelectric orthorhombic R phase" . | JOURNAL OF MATERIALS CHEMISTRY A 9 . 43 (2021) : 24387-24396 . |
| APA | Kang, Ruirui , Wang, Zepeng , Yang, Weijie , Zhu, Xiaopei , Shi, Peng , Gao, Yangfei et al. Extraordinary energy storage performance and thermal stability in sodium niobate-based ceramics modified by the ion disorder and stabilized antiferroelectric orthorhombic R phase . | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (43) , 24387-24396 . |
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Abstract ：
Dielectric energy storage materials have attracted much attention because of their wide applications in the electronics industry. However, low energy storage density and poor thermostability limit their application. In this work, a strategy was proposed to prepare lead-free relaxor ferroelectric ceramics with ultra-high energy storage properties and superior temperature stability by precisely adjusting the relaxation and ferroelectricity states and increasing the electric field intensity. An ultra-high recoverable energy storage density (Wr) of 4.97 J/cm3 and an efficiency (η) of 84.4% are simultaneously obtained for the 0.95(0.9Bi0.5Na0.5TiO3-0.1Ba0.85Ca0.15Zr0.1Ti0.9O3)-0.05BaSnO3 ceramic. Moreover, a high Wr of 2.73 J/cm3 with brilliant η of 80.6% are obtained in the ceramic at 140 and there is almost no thermal degradation of energy storage properties from 25 to 140 . The Wr and η have decreased by 2.2% and 1.9% after 105 cycles under 200 kV/cm, respectively, which demonstrates the good cycle stability of the sample. A discharge power density of up to 99.0 MW/cm3 is obtained in the 0.95(0.9Bi0.5Na0.5TiO3-0.1Ba0.85Ca0.15Zr0.1Ti0.9O3)-0.05BaSnO3 ceramic and the good charge and discharge performance of this sample is important for practical applications. © 2021
Keyword ：
Barium compounds Electric fields Electronics industry Energy storage Ferroelectricity Ferroelectric materials Polarization Storage (materials)
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| GB/T 7714 | Shi, Peng , Zhu, Xiaopei , Lou, Xiaojie et al. Tailoring ferroelectric polarization and relaxation of BNT-based lead-free relaxors for superior energy storage properties [J]. | Chemical Engineering Journal , 2021 , 428 . |
| MLA | Shi, Peng et al. "Tailoring ferroelectric polarization and relaxation of BNT-based lead-free relaxors for superior energy storage properties" . | Chemical Engineering Journal 428 (2021) . |
| APA | Shi, Peng , Zhu, Xiaopei , Lou, Xiaojie , Yang, Bian , Liu, Qida , Kong, Chuncai et al. Tailoring ferroelectric polarization and relaxation of BNT-based lead-free relaxors for superior energy storage properties . | Chemical Engineering Journal , 2021 , 428 . |
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Abstract ：
In this work, the electrocaloric (EC) effect was studied in the (100-x)BaHf0.2Ti0.8O3-xBa0.94Sm0.04TiO3 (BHT-xBST) ceramics fabricated by the conventional solid-reaction method. By tuning composition to their diffuse phase transition (DPT), invariant critical point (ICP) and first-order phase transition (FPT), the large electrocaloric response with a temperature change of ΔT = 0.46 °C (at 64 °C) under 30 kV/cm and an electrocaloric strength of ΔT/ΔE = 0.18 K mm/kV under 12 kV/cm were achieved in BHT-70BST. In addition, BHT-50BST shows a broad EC working temperature window from 28 °C to 68 °C because of its diffusion behavior near the ferroelectric-to-paraelectric phase transition and multiphase coexistence. The maximum ΔT of BHT-50BST is larger than that of BHT-40BST with only diffusion character but no multiphase coexistence. This work may provide a design strategy to enhance EC performance with a broad working temperature region in lead-free rare-earth doped BaTiO3-based ceramics by combining the diffusion behavior, multiphase coexistence and heterovalent substitution. © 2020 Elsevier Ltd and Techna Group S.r.l.
Keyword ：
Barium titanate Diffusion Hafnium Rare earths Samarium
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| GB/T 7714 | Zhang, Boyang , Lou, Xiaojie , Zheng, Kun et al. Enhanced electrocaloric effect in the Sm and Hf co-doped BaTiO3 ceramics [J]. | Ceramics International , 2021 , 47 (1) : 1101-1108 . |
| MLA | Zhang, Boyang et al. "Enhanced electrocaloric effect in the Sm and Hf co-doped BaTiO3 ceramics" . | Ceramics International 47 . 1 (2021) : 1101-1108 . |
| APA | Zhang, Boyang , Lou, Xiaojie , Zheng, Kun , Xie, Xuefan , Shi, Peng , Guo, Mengyao et al. Enhanced electrocaloric effect in the Sm and Hf co-doped BaTiO3 ceramics . | Ceramics International , 2021 , 47 (1) , 1101-1108 . |
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Abstract ：
Lead-free dielectric capacitors for energy storage device have attracted increasing attention recently because of their high-power density and superior temperature stability. In this work, Nd-doped silver niobate (AgNbO3, abbreviated as AN) lead-free antiferroelectric ceramics were prepared by utilizing traditional solid state reaction method. A large energy storage density of 4.6 J/cm3 and an efficiency of 62.5% were simultaneously obtained in the 1% Nd-doped AN sample with an outstanding power density of 54.0 MW/cm3 and an ultrafast discharge speed (t0.9) of 59.2 ns. Additionally, the 1% Nd-doped AN ceramic demonstrates a good temperature stability from 25 degrees C to 130 degrees C. The excellent energy storage properties of the 1% Nd-doped ceramic is ascribed to the enhanced breakdown electric field induced by grain size engineering and the construction of phase structure via heterovalent substitution at the A-site of the lattice structure at room temperature. Our present work suggests that the 1% Nd-doped AN ceramic show promise for energy storage application in miniaturized mobile electronic devices and high-power equipment. (c) 2021 Elsevier B.V. All rights reserved.
Keyword ：
Antiferroelectrics Energy storage Lead-free ceramics
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| GB/T 7714 | Shi, Peng , Wang, Xiangjian , Lou, Xiaojie et al. Significantly enhanced energy storage properties of Nd3+doped AgNbO3 lead-free antiferroelectric ceramics [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 877 . |
| MLA | Shi, Peng et al. "Significantly enhanced energy storage properties of Nd3+doped AgNbO3 lead-free antiferroelectric ceramics" . | JOURNAL OF ALLOYS AND COMPOUNDS 877 (2021) . |
| APA | Shi, Peng , Wang, Xiangjian , Lou, Xiaojie , Zhou, Chao , Liu, Qida , He, Liqiang et al. Significantly enhanced energy storage properties of Nd3+doped AgNbO3 lead-free antiferroelectric ceramics . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 877 . |
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Abstract ：
The flexoelectric effect, which manifests itself as a strain-gradient-induced electrical polarization, has triggered great interest due to its ubiquitous existence in crystalline materials without the limitation of lattice symmetry. Here, we propose a flexoelectric photodetector based on a thin-film heterostructure. This prototypical device is demonstrated by epitaxial LaFeO3 thin films grown on LaAlO3 substrates. A giant strain gradient of the order of 10(6)/m is achieved in LaFeO3 thin films, giving rise to an obvious flexoelectric polarization and generating a significant photovoltaic effect in the LaFeO3-based heterostructures with nanosecond response under light illumination. This work not only demonstrates a novel self-powered photodetector different from the traditional interface-type structures, such as the p-n and Schottky junctions but also opens an avenue to design practical flexoelectric devices for nanoelectronics applications.
Keyword ：
Flexoelectric effect heterostructure photovoltaic effect strain gradient thin film
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| GB/T 7714 | Wu, Ming , Jiang, Zhizheng , Lou, Xiaojie et al. Flexoelectric Thin-Film Photodetectors [J]. | NANO LETTERS , 2021 , 21 (7) : 2946-2952 . |
| MLA | Wu, Ming et al. "Flexoelectric Thin-Film Photodetectors" . | NANO LETTERS 21 . 7 (2021) : 2946-2952 . |
| APA | Wu, Ming , Jiang, Zhizheng , Lou, Xiaojie , Zhang, Fan , Song, Dongsheng , Ning, Shoucong et al. Flexoelectric Thin-Film Photodetectors . | NANO LETTERS , 2021 , 21 (7) , 2946-2952 . |
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Abstract ：
In this work, novel Ni3Se2 nanowires are synthesized in situ on the surface of nickel foam (Ni3Se2 NWs@NF) through a one-step hydrothermal reaction under different reaction times, and they demonstrate excellent energy storage performance for hybrid supercapacitors (HSCs). Owing to their good electron transfer capability and porous and hierarchical architecture, the as-prepared Ni3Se2 NWs@NF shows a high capacity of 2.6 C cm-2 at 5 mA cm-2 in a three-electrode cell. Even if the current density increases up to 250 mA cm-2, its specific capacity still remains at 0.93 C cm-2, exhibiting excellent rate capability. Furthermore, an HSC was assembled with the as-prepared Ni3Se2 NWs@NF as the positive electrode and activated carbon (AC) as the negative electrode, in 2 M KOH aqueous electrolyte. The Ni3Se2 NWs@NF//AC HSC demonstrates a high energy density of 64.4 W h kg-1 at a power density of 446.8 W kg-1 at 0.43 A g-1 with an extended voltage of 1.6 V, along with outstanding long-term cycling stability that retains 93.9% of the initial capacity after 10?000 cycles. To the best of our knowledge, the Ni3Se2 NWs@NF//AC HSC developed in this work demonstrates the best capacity performance among the reported HSCs with nickel selenides as electrode materials in aqueous electrolytes. Our results manifest that the Ni3Se2 NWs@NF is a promising electrode material for high-performance HSCs. This journal is © the Partner Organisations.
Keyword ：
Electrodes Electrolytes Electron transport properties Energy storage Nickel compounds Potassium hydroxide Selenium compounds Supercapacitor
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| GB/T 7714 | Li, Wei , Chen, Tianqi , Li, Ao et al. High energy density hybrid supercapacitors derived from novel Ni3Se2nanowires: In situ constructed on porous nickel foam [J]. | Inorganic Chemistry Frontiers , 2021 , 8 (4) : 1093-1101 . |
| MLA | Li, Wei et al. "High energy density hybrid supercapacitors derived from novel Ni3Se2nanowires: In situ constructed on porous nickel foam" . | Inorganic Chemistry Frontiers 8 . 4 (2021) : 1093-1101 . |
| APA | Li, Wei , Chen, Tianqi , Li, Ao , Shi, Peng , Wu, Ming , Li, Tingting et al. High energy density hybrid supercapacitors derived from novel Ni3Se2nanowires: In situ constructed on porous nickel foam . | Inorganic Chemistry Frontiers , 2021 , 8 (4) , 1093-1101 . |
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Abstract ：
Ferroelectric tunnel junctions (FTJs) are promising candidates for next-generation memories due to fast read/write speeds and low-power consumptions. Here, we investigate resistance fatigue of FTJs, which is performed on Pt/BaTiO3/Nb:SrTiO3 devices. By direct observations of the 5-unit cell-thick BaTiO3 barrier with high-angle annular dark-field imaging and electron energy loss spectroscopy, oxygen vacancies are found to aggregate at the Pt/ BaTiO3 interface during repetitive switching, leading to a ferroelectric dead layer preventing domain nucleation and growth. Severe oxygen deficiency also makes BaTiO3 lattices energetically unfavorable and lastly induces a destruction of local perovskite structure of the barrier. Ferroelectric properties are thus degraded, which reduces barrier contrast between ON and OFF states and smears electroresistance characteristics of Pt/BaTiO3/Nb:SrTiO3 FTJs. These results reveal an atomic-scale fatigue mechanism of ultrathin ferroelectric barriers associated with the aggregation of charged defects, facilitating the design of reliable FTJs and ferroelectric nanoelectronic devices for practical applications.
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| GB/T 7714 | Yang, Yihao , Wu, Ming , Zheng, Xingwen et al. Atomic-scale fatigue mechanism of ferroelectric tunnel junctions [J]. | SCIENCE ADVANCES , 2021 , 7 (48) . |
| MLA | Yang, Yihao et al. "Atomic-scale fatigue mechanism of ferroelectric tunnel junctions" . | SCIENCE ADVANCES 7 . 48 (2021) . |
| APA | Yang, Yihao , Wu, Ming , Zheng, Xingwen , Zheng, Chunyan , Xu, Jibo , Xu, Zhiyu et al. Atomic-scale fatigue mechanism of ferroelectric tunnel junctions . | SCIENCE ADVANCES , 2021 , 7 (48) . |
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