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  • Wiley  (7)
  • Ai, Ding  (7)
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  • 1
    Online Resource
    Online Resource
    Scalable Polymer Nanocomposites with Record High‐Temperature Capacitive Performance Enabled by Rationally Designed Nanostructured Inorganic Fillers
    Wiley ; 2019
    In:  Advanced Materials Vol. 31, No. 23 ( 2019-06)
    Details
    In: Advanced Materials, Wiley, Vol. 31, No. 23 ( 2019-06)
    Abstract: Next‐generation microelectronics and electrical power systems call for high‐energy‐density dielectric polymeric materials that can operate efficiently under elevated temperatures. However, the currently available polymer dielectrics are limited to relatively low working temperatures. Here, the solution‐processable polymer nanocomposites consisting of readily prepared Al 2 O 3 fillers with systematically varied morphologies including nanoparticles, nanowires, and nanoplates are reported. The field‐dependent electrical conduction of the polymer nanocomposites at elevated temperatures is investigated. A strong dependence of the conduction behavior and breakdown strength of the polymer composites on the filler morphology is revealed experimentally and is further rationalized via computations. The polymer composites containing Al 2 O 3 nanoplates display a record capacitive performance, e.g., a discharged energy density of 3.31 J cm −3 and a charge–discharge efficiency of 〉 90% measured at 450 MV m −1 and 150 °C, significantly outperforming the state‐of‐the‐art dielectric polymers and nanocomposites that are typically prepared via tedious, low‐yield approaches.
    Type of Medium: Online Resource
    ISSN: 0935-9648 , 1521-4095
    URL: Issue
    URL: Article
    DOI: 10.1002/adma.v31.23
    DOI: 10.1002/adma.201900875
    RVK:
    UA 1538
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 1474949-X
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  • 2
    Online Resource
    Online Resource
    Enabling High‐Energy‐Density High‐Efficiency Ferroelectric Polymer Nanocomposites with Rationally Designed Nanofillers
    Wiley ; 2021
    In:  Advanced Functional Materials Vol. 31, No. 1 ( 2021-01)
    Details
    In: Advanced Functional Materials, Wiley, Vol. 31, No. 1 ( 2021-01)
    Abstract: Ferroelectric polymers have been regarded as the preferred matrix for high‐energy‐density dielectric polymer nanocomposites because of their highest dielectric constants among the known polymers. Despite a library of ferroelectric polymer‐based composites having been demonstrated as highly efficient in enhancing the energy density, the charge–discharge efficiency remains moderate because of the high intrinsic loss of ferroelectric polymers. Herein, a systematic study of the oxide nanofillers is presented with varied dielectric constants and the vital role of the dielectric match between the filler and the polymer matrix on the capacitive performance of the ferroelectric polymer composites is revealed. A combined experimental and simulation study is further performed to specifically investigate the effect of the nanofiller morphology on the electrica properties of the polymer nanocomposites. The solution‐processed ferroelectric polymer nanocomposite embedded with Al 2 O 3 nanoplates exhibits markedly improved breakdown strength and discharged energy density along with an exceptional charge–discharge efficiency of 83.4% at 700 MV m −1 , which outperforms the ferroelectric polymers and nanocomposites reported to date. This work establishes a facile approach to high‐performance ferroelectric polymer composites through capitalizing on the synergistic effect of the dielectric properties and morphology of the oxide fillers.
    Type of Medium: Online Resource
    ISSN: 1616-301X , 1616-3028
    URL: Issue
    URL: Article
    DOI: 10.1002/adfm.v31.1
    DOI: 10.1002/adfm.202006739
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2029061-5
    detail.hit.zdb_id: 2039420-2
    SSG: 11
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Nanostructured Ferroelectric‐Polymer Composites for Capacitive Energy Storage
    Wiley ; 2018
    In:  Small Methods Vol. 2, No. 6 ( 2018-06)
    Details
    In: Small Methods, Wiley, Vol. 2, No. 6 ( 2018-06)
    Abstract: The introduction of inorganic components into a polymer matrix to form polymer composites is an emerging and promising approach to dielectric materials for capacitive energy storage. Ferroelectric polymers are particularly attractive as matrices for dielectric polymer composites owing to their highest dielectric constant (≥10) among the known polymers. Here, the important aspects and recent advances in the development of the ferroelectric‐polymer‐based dielectric polymer composites for high‐energy‐density capacitor applications are summarized. The preparation methods of ferroelectric‐polymer composites with 0D, 1D, and 2D nanostructured fillers, surface‐modified nanofillers, and hierarchically structured fillers, and their comprehensive impacts on the dielectric properties, breakdown strength, and energy density of the resulting composites are described. The most recent progress on the incorporation of multiple nanofillers with complementary functionalities into ferroelectric polymers and the design of layer‐structured ferroelectric‐polymer composites is also highlighted. A discussion of the scientific and technological issues that remain to be addressed and an outlook for the future of ferroelectric polymer‐based dielectric composites are also presented.
    Type of Medium: Online Resource
    ISSN: 2366-9608 , 2366-9608
    URL: Issue
    URL: Article
    DOI: 10.1002/smtd.v2.6
    DOI: 10.1002/smtd.201700399
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2884448-8
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  • 4
    Online Resource
    Online Resource
    Tuning Nanofillers in In Situ Prepared Polyimide Nanocomposites for High‐Temperature Capacitive Energy Storage
    Wiley ; 2020
    In:  Advanced Energy Materials Vol. 10, No. 16 ( 2020-04)
    Details
    In: Advanced Energy Materials, Wiley, Vol. 10, No. 16 ( 2020-04)
    Abstract: Modern electronics and electrical systems demand efficient operation of dielectric polymer‐based capacitors at high electric fields and elevated temperatures. Here, polyimide (PI) dielectric composites prepared from in situ polymerization in the presence of inorganic nanofillers are reported. The systematic manipulation of the dielectric constant and bandgap of the inorganic fillers, including Al 2 O 3 , HfO 2 , TiO 2 , and boron nitride nanosheets, reveals the dominant role of the bandgap of the fillers in determining and improving the high‐temperature capacitive performance of the polymer composites, which is very different from the design principle of the dielectric polymer composites operating at ambient temperature. The Al 2 O 3 ‐ and HfO 2 ‐based PI composites with concomitantly large bandgap and moderate dielectric constants exhibit substantial improvement in the breakdown strength, discharged energy density, and charge–discharge efficiency when compared to the state‐of‐the‐art dielectric polymers. The work provides a design paradigm for high‐performance dielectric polymer nanocomposites for electrical energy storage at elevated temperatures.
    Type of Medium: Online Resource
    ISSN: 1614-6832 , 1614-6840
    URL: Issue
    URL: Article
    DOI: 10.1002/aenm.v10.16
    DOI: 10.1002/aenm.201903881
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2594556-7
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  • 5
    Online Resource
    Online Resource
    High‐Temperature High‐Energy‐Density Dielectric Polymer Nanocomposites Utilizing Inorganic Core–Shell Nanostructured Nanofillers
    Wiley ; 2021
    In:  Advanced Energy Materials Vol. 11, No. 28 ( 2021-07)
    Details
    In: Advanced Energy Materials, Wiley, Vol. 11, No. 28 ( 2021-07)
    Abstract: High‐energy‐density polymer dielectrics capable of high temperature operation are highly demanded in advanced electronics and power systems. Here, the polyetherimide (PEI) composites filled with the core–shell structured nanoparticles composed of ZrO 2 core and Al 2 O 3 shell are described. The establishment of a gradient of the dielectric constants from ZrO 2 core and Al 2 O 3 shell to PEI matrix gives rise to much less distortion of the electric field around the nanoparticles, and consequently, high breakdown strength at varied temperatures. The wide bandgap Al 2 O 3 shell creates deep traps in the composites and thus yields an order of magnitude lower leakage of current density of the composites with respect to those with pristine ZrO 2 at high temperatures. Accordingly, the composite delivers a discharged energy density of 5.19 J cm −3 and 150  ° C, which outperforms the current free‐standing high‐temperature dielectric polymer and polymer composite films measured at 10 Hz. Moreover, the core–shell structured composites endow great thermal stability, charge–discharge efficiency, and the improved energy density with increasing temperature from 25 to 150  ° C. The finite element simulations and numerical calculations are performed to reveal the mechanistic impacts of the core–shell structure on the electric field distribution and electrical conduction of the composites.
    Type of Medium: Online Resource
    ISSN: 1614-6832 , 1614-6840
    URL: Issue
    URL: Article
    DOI: 10.1002/aenm.v11.28
    DOI: 10.1002/aenm.202101297
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2594556-7
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  • 6
    Online Resource
    Online Resource
    Integrated Ultrafine Co 0.85 Se in Carbon Nanofibers: An Efficient and Robust Bifunctional Catalyst for Oxygen Electrocatalysis
    Wiley ; 2020
    In:  Chemistry – A European Journal Vol. 26, No. 18 ( 2020-03-26), p. 4063-4069
    Details
    In: Chemistry – A European Journal, Wiley, Vol. 26, No. 18 ( 2020-03-26), p. 4063-4069
    Abstract: Transition‐metal selenides are emerging as alternative bifunctional catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR); however, their activity and stability are still less than desirable. Herein, ultrafine Co 0.85 Se nanoparticles encapsulated into carbon nanofibers (CNFs), Co 0.85 Se@CNFs, is reported as an integrated bifunctional catalyst for OER and ORR. This catalyst exhibits a low OER potential of 1.58 V vs. reversible hydrogen electrode (RHE) ( E J =10, OER ) to achieve a current density ( J ) of 10 mA cm −2 and a high ORR potential of 0.84 V vs. RHE ( E J =−1, ORR ) to reach −1 mA cm −2 . Thus, the potential between E J =10, OER and E J =−1, ORR is only 0.74 V, indicating considerable bifunctional activity. The excellent bifunctionality can be attributed to high electronic conduction, abundant electrochemically active sites, and the synergistic effect of Co 0.85 Se and CNFs. Furthermore, this Co 0.85 Se@CNFs catalyst displays good cycling stability for both OER and ORR. This study paves a new way for the rational design of hybrid catalysts composed of transition‐metal selenides and carbon materials for efficiently catalyzing OER and ORR.
    Type of Medium: Online Resource
    ISSN: 0947-6539 , 1521-3765
    URL: Issue
    URL: Article
    DOI: 10.1002/chem.v26.18
    DOI: 10.1002/chem.201903616
    RVK:
    VA 1120 ; VA 3507
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 1478547-X
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  • 7
    Online Resource
    Online Resource
    Ternary polymer nanocomposites with concurrently enhanced dielectric constant and breakdown strength for high‐temperature electrostatic capacitors
    Wiley ; 2020
    In:  InfoMat Vol. 2, No. 2 ( 2020-03), p. 389-400
    Details
    In: InfoMat, Wiley, Vol. 2, No. 2 ( 2020-03), p. 389-400
    Abstract: The exploration of high‐energy‐density electrostatic capacitors capable of operating both efficiently and reliably at elevated temperatures is of great significance in order to meet advanced power electronic applications. The energy density of a capacitor is strongly dependent on dielectric constant and breakdown strength of a dielectric material. Here, we demonstrate a class of solution‐processable polymer nanocomposites exhibiting a concurrent improvement in dielectric constant and breakdown strength, which typically show a negative correlation in conventional dielectric materials, along with a reduction in dielectric loss. The excellent performance is enabled by the elegant combination of nanostructured barium titanate and boron nitride fillers with complementary functionalities. The ternary polymer nanocomposite with the optimized filler compositions delivers a discharged energy density of 2.92 J cm −3 and a Weibull breakdown strength of 547 MV m −1 at 150°C, which are 83% and 25%, respectively, greater than those of the pristine polymer. The conduction behaviors including interfacial barrier and carrier transport process have been investigated to rationalize the energy storage performance of ternary polymer nanocomposite. This contribution provides a new design paradigm for scalable high‐temperature polymer film capacitors. image
    Type of Medium: Online Resource
    ISSN: 2567-3165 , 2567-3165
    URL: Issue
    URL: Article
    DOI: 10.1002/inf2.v2.2
    DOI: 10.1002/inf2.12043
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2902931-4
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