电活性材料中的巨效应 Electroactive Materials Exhibiting Colossal Collective Properties

报告摘要：

This talk will describe our most recent efforts to develop novel electroactive materials for advanced electronics and energy applications. As ferroelectric materials are capable of exhibiting many unique features including dielectric, piezoelectric, and pyroelectric properties due to its switchable spontaneous polarization under an electric field, the coupling across different fields (mechanical, thermal, and electromagnetic, etc) opens up a host of new collective properties and functionalities in the tailored materials. Specifically, the introduction of the inorganic nanostructures yields substantial enhancements in both electric displacement and breakdown strength, leading to the polymer nanocomposites with greatly improved energy densities for applications in advanced electrical energy storage devices. We have demonstrated a strong coupling of molecularly engineered ferroelectric polymers and ferromagnetic inorganics in the multiferroic polymer composites, thus opening an exciting research arena where various electro- and magneto-active nanostructures can be judiciously assembled to exhibit colossal collective properties. The structures and compositions of the ferroelectric polymer and ceramics have be designed and tuned to boost the electrocaloric responses by optimizing the ferroelectric-paraelectric phase transition and the dielectric properties, which have profound implications for solid-state cooling devices that are energy efficient and environmental benign.

报告人介绍：

王庆教授长期致力于功能高分子及其纳米复合材料与器件的研究，并结合材料与器件在新型能源、电子和信息等领域广阔的应用前景，系统研发了高性能共聚物及纳米复合储能材料与电容器、制冷用高效复合电卡材料与器件，以及新型磁电信息材料等，相关研究处于世界领先水平。以通讯作者发表了包括Nature、Advanced Materials、Nature Communications、Energy & Environmental Science和Journal of the American Chemical Society等在内的高水平学术论文50余篇（论文被引用超过3000 次，H 因子35），并获多项国际专利。研究获得多项国家级（美国）项目和企业项目资助，总经费超过1000万美元。研究成果对推进新型能源和信息的开发利用、存储和转换技术的发展具有重要意义。