Kim Minsoo P, Um Doo-Seung, Shin Young-Eun, Ko Hyunhyub
School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea.
Department of Electrical Engineering, Sejong University, Seoul, Republic of Korea.
Nanoscale Res Lett. 2021 Feb 12;16(1):35. doi: 10.1186/s11671-021-03492-4.
Energy harvesting devices based on the triboelectric effect have attracted great attention because of their higher output performance compared to other nanogenerators, which have been utilized in various wearable applications. Based on the working mechanism, the triboelectric performance is mainly proportional to the surface charge density of the triboelectric materials. Various approaches, such as modification of the surface functional group and dielectric composition of the triboelectric materials, have been employed to enhance the surface charge density, leading to improvements in triboelectric performances. Notably, tuning the dielectric properties of triboelectric materials can significantly increase the surface charge density because the surface charge is proportional to the relative permittivity of the triboelectric material. The relative dielectric constant is modified by dielectric polarization, such as electronic, vibrational (or atomic), orientation (or dipolar), ionic, and interfacial polarization. Therefore, such polarization represents a critical factor toward improving the dielectric constant and consequent triboelectric performance. In this review, we summarize the recent insights on the improvement of triboelectric performance via enhanced dielectric polarization.
基于摩擦电效应的能量收集装置因其与其他纳米发电机相比具有更高的输出性能而备受关注，这些装置已被应用于各种可穿戴应用中。基于其工作机制，摩擦电性能主要与摩擦电材料的表面电荷密度成正比。人们采用了各种方法，如修饰摩擦电材料的表面官能团和介电成分，以提高表面电荷密度，从而改善摩擦电性能。值得注意的是，调节摩擦电材料的介电性能可以显著提高表面电荷密度，因为表面电荷与摩擦电材料的相对介电常数成正比。相对介电常数通过介电极化来改变，如电子极化、振动（或原子）极化、取向（或偶极）极化、离子极化和界面极化。因此，这种极化是提高介电常数以及随之而来的摩擦电性能的关键因素。在本综述中，我们总结了通过增强介电极化来改善摩擦电性能的最新见解。
