Han Xiao, Ji Yun, Wu Li, Xia Yanlong, Bowen Chris R, Yang Ya
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, People's Republic of China.
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
Nanomicro Lett. 2022 Oct 6;14(1):198. doi: 10.1007/s40820-022-00943-0.
Coupled nanogenerators have been a research hotspot due to their ability to harvest a variety of forms of energy such as light, mechanical and thermal energy and achieve a stable direct current output. Ferroelectric films are frequently investigated for photovoltaic applications due to their unique photovoltaic properties and bandgap-independent photovoltage, while the flexoelectric effect is an electromechanical property commonly found in solid dielectrics. Here, we effectively construct a new form of coupled nanogenerator based on a flexible BiFeO ferroelectric film that combines both flexoelectric and photovoltaic effects to successfully harvest both light and vibration energies. This device converts an alternating current into a direct current and achieves a 6.2% charge enhancement and a 19.3% energy enhancement to achieve a multi-dimensional "1 + 1 > 2" coupling enhancement in terms of current, charge and energy. This work proposes a new approach to the coupling of multiple energy harvesting mechanisms in ferroelectric nanogenerators and provides a new strategy to enhance the transduction efficiency of flexible functional devices.
耦合纳米发电机因其能够收集多种形式的能量（如光能、机械能和热能）并实现稳定的直流输出而成为研究热点。铁电薄膜因其独特的光伏特性和与带隙无关的光电压而经常被研究用于光伏应用，而挠曲电效应是固体电介质中常见的一种机电特性。在此，我们基于柔性BiFeO铁电薄膜有效地构建了一种新型耦合纳米发电机，该薄膜结合了挠曲电效应和光伏效应，成功地收集了光能和振动能。该器件将交流电转换为直流电，并实现了6.2%的电荷增强和19.3%的能量增强，从而在电流、电荷和能量方面实现了多维的“1 + 1 > 2”耦合增强。这项工作提出了一种铁电纳米发电机中多种能量收集机制耦合的新方法，并为提高柔性功能器件的转换效率提供了新策略。
