School of Resources Environment and Materials, Center on Nanoenergy Research, Guangxi University, Nanning, Guangxi, 530004, P. R China.
CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, P. R. China.
ACS Appl Mater Interfaces. 2023 May 17;15(19):23226-23235. doi: 10.1021/acsami.3c02494. Epub 2023 May 2.
Ferroelectric materials have a variety of properties, such as piezoelectricity, pyroelectricity, and the ferroelectric photovoltaic effect, which enable them to obtain electrical energy from various external stimuli. Here, we report a coupled nanogenerator based on flexible BTO ferroelectric films with a cantilevered beam structure. It combines the photovoltaic and flexoelectric effects in a ferroelectric materials-based coupled nanogenerator for simultaneously scavenging vibration energy and light energy, thus improving energy scavenging performance. As compared with the photovoltaic effect individually, simultaneous vibration and light illumination under a light intensity of 57 mW/cm at 405 nm can produce a photo-flexoelectric coupling current of 85 nA, where the current peak has been enhanced by 121%. Due to the photo-flexoelectric coupling effect, the device has outstanding charging performance, where a 4.7 μF capacitor can be charged to 60 mV in 150 s. These devices have potential applications in multi-energy scavenging and self-powered sensors.
铁电材料具有多种特性，如压电性、热释电性和铁电光伏效应，使其能够从各种外部刺激中获取电能。在这里，我们报告了一种基于具有悬臂梁结构的柔性 BTO 铁电薄膜的耦合纳米发电机。它将光伏效应和铁电材料中的挠曲电效应结合在一个耦合纳米发电机中，用于同时收集振动能和光能，从而提高能量收集性能。与单独的光伏效应相比，在 405nm 下 57mW/cm 的光强下同时进行振动和光照，可以产生 85nA 的光-挠曲电耦合电流，其中电流峰值增强了 121%。由于光-挠曲电耦合效应，该器件具有出色的充电性能，其中 4.7μF 的电容器可以在 150s 内充电到 60mV。这些器件在多能量收集和自供电传感器中有潜在的应用。
