Relaxor Ferroelectric‐Based Electrocaloric Polymer Nanocomposites with a Broad Operating Temperature Range and High Cooling Energy

Li, Qi; Zhang, Guangzu; Zhang, Xiaoshan; Jiang, Shenglin; Zeng, Yu; Wang, Qing

doi:10.1002/adma.201405495

Cited by 156 publications

(97 citation statements)

References 34 publications

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“…As a result, the refrigeration effect of ferroelectrics is achieved. Although giant ECEs have been found in ferroelectric polymers, ceramics and polymer-ceramic composites, much effort is still devoted to developing those novel electronic materials which could possess large ECE entropy change [3][4][5][6][7][8][9]. Remarkably, some ferroelectric materials exhibit abnormal ECE which is in contrast to those aforementioned, suggesting that cooling occurs in the ECE materials with the application of an electric field and heating occurs in the materials with its removal.…”

Section: Introductionmentioning

confidence: 51%

Exceptionally High Negative Electro-Caloric Effects of Poly(VDF–co–TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers

Jiang

Zheng

et al. 2017

Polymers

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Exceptionally high electro-caloric effects (ECEs) are observed in nanocomposites consisting of poly(vinylidene fluoride-co-trifluoroethylene) (VDF-co-TrFE) copolymer and barium titanate (BT) nanoparticles and nanowires. The poly(VDF-co-TrFE) matrix nanocomposites containing 5% volume fraction of BT nanowires are found to exhibit a negative ECE temperature change as large as 12 • C or a refrigeration effect of 8.3 J/g, which is much larger than those reported to date. The mechanisms of negative ECE and the enhanced negative ECE in the nanocomposites consisting of poly(VDF-co-TrFE) and BT nanowires are explained by the Kauzmann theory on glassy polar states and the interaction between BT nanofillers and the copolymer matrix. The effects of geometries of BT nanofillers on the negative ECEs are elucidated by P-E loop measurements, and dielectric and dynamical mechanical analyses. The nanocomposites, with their enhanced negative ECE tuned by the geometries of BT nanofillers, provide us with promising ECE refrigerants for practical application to small-sized and environmentally-friendly ECE coolers in the heat management of electronic devices.

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Section: Introductionmentioning

confidence: 51%

Exceptionally High Negative Electro-Caloric Effects of Poly(VDF–co–TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers

Jiang

Zheng

et al. 2017

Polymers

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“…A number of studies have reported ceramic/polymer nanocomposites with high energy density 6, 7. For example a discharge energy density of 20 J cm −3 at 646 kV mm −1 was reported for BaTiO 3 @TiO 2 core–shell fibers in a polyvinylidene fluoride polymer matrix (denoted as BaTiO 3 @TiO 2 /PVDF, where @ denotes a core–shell structure) 8.…”

mentioning

confidence: 99%

“…Table 1 summarizes the performance of some typical polymer‐based dielectric composites with the electric field. The large energy density at such a low electric field in these nanocomposites can be attributed to (i) the dual phase nature of the TiO 2 @PZT nanowire array, which results in large interfacial regions and hence large interfacial polarization;24, 25 (ii) the highly oriented nanowire also plays an important role in increasing the polarization and electromechanical coupling of the nanocomposites;6, 16 and (iii) the obtained high permittivity of the nanocomposites yields high saturation polarization (Equation (3)), and the nanocomposites possess narrow hysteresis loops with low values of P r as shown in Figures S5–S7 (Supporting Information), which lead to largely enhanced P max − P r values.…”

mentioning

confidence: 99%

High Discharge Energy Density at Low Electric Field Using an Aligned Titanium Dioxide/Lead Zirconate Titanate Nanowire Array

et al. 2017

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Polymer‐based capacitors with high energy density have attracted significant attention in recent years due to their wide range of potential applications in electronic devices. However, the obtained high energy density is predominantly dependent on high applied electric field, e.g., 400–600 kV mm−1, which may bring more challenges relating to the failure probability. Here, a simple two‐step method for synthesizing titanium dioxide/lead zirconate titanate nanowire arrays is exploited and a demonstration of their ability to achieve high discharge energy density capacitors for low operating voltage applications is provided. A high discharge energy density of 6.9 J cm−3 is achieved at low electric fields, i.e., 143 kV mm−1, which is attributed to the high relative permittivity of 218.9 at 1 kHz and high polarization of 23.35 µC cm−2 at this electric field. The discharge energy density obtained in this work is the highest known for a ceramic/polymer nanocomposite at such a low electric field. The novel nanowire arrays used in this work are applicable to a wide range of fields, such as energy harvesting, energy storage, and photocatalysis.

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“…In comparing with the inorganic materials, highperformance polymers and polymer-based composites (organic materials) show the characteristics of lightweight, flexibility, and resistance to acid and alkali as well as easy processing [24,25]. As a result, these organic materials are tremendously studied as dielectrics to replace the inorganic materials [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately, the relative permittivity of the polymer can be effectively improved through the introduction of fillers [24]. At present, the fabrication of polymeric composite dielectrics showing high-k, low loss tangent, low density, and good mechanical properties is of great significance to the preparation of new energy storage elements [25].…”

Section: Introductionmentioning

confidence: 99%

Polyarylene Ether Nitrile-Based High-k Composites for Dielectric Applications

Zhan

Wang

et al. 2018

International Journal of Polymer Science

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Flexible polymer-based composites exhibiting high dielectric constant as well as low dielectric loss have been intensively investigated for their potential utilization in electronics and electricity industry and energy storage. Resulting from the polar -CN on the side chain, polyarylene ether nitrile (PEN) shows relatively high dielectric constant which has been extensively investigated as one of the hot spots as dielectric materials. However, the dielectric constant of PEN is still much lower than the ceramic dielectrics such as BaTiO 3 , TiO 2 , and Al 2 O 3 . In this review, recent and in-progress advancements in the designing and preparing strategies to obtain high-k PEN-based nanocomposites are summarized. According to the types of the added fillers, the effects of organic fillers, dielectric ceramic fillers, and conductive fillers on electric properties of PEN-based composites are investigated. In addition, other factors including the structures and sizes of the additive, the compatibility between the additive agent and the PEN, and the interface which affects the dielectric properties of the obtained composite materials are investigated. Finally, challenges facing in the design of more effective strategies for the high-k PEN-based dielectric materials are discussed.

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Relaxor Ferroelectric‐Based Electrocaloric Polymer Nanocomposites with a Broad Operating Temperature Range and High Cooling Energy

Cited by 156 publications

References 34 publications

Exceptionally High Negative Electro-Caloric Effects of Poly(VDF–co–TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers

Exceptionally High Negative Electro-Caloric Effects of Poly(VDF–co–TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers

High Discharge Energy Density at Low Electric Field Using an Aligned Titanium Dioxide/Lead Zirconate Titanate Nanowire Array

Polyarylene Ether Nitrile-Based High-k Composites for Dielectric Applications

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