Improved piezoelectricity of polylactide using vitamin B 2 for poling-free mechanical and acoustic nanogenerators
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Improved piezoelectricity of polylactide using vitamin B2 for poling-free mechanical and acoustic nanogenerators Bingya Li1, Xiaoran Hu1,*, Qian Zhang1, Xiaoli Peng1, and Yong Xiang1 1
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, China
Received: 17 June 2020
ABSTRACT
Accepted: 1 September 2020
In this study, we designed and fabricated a poling-free piezoelectric nanogenerator using bio-based polymer and filler, a poly(L-lactic acid) (PLLA)/vitamin B2 (VB2) composite film. The addition of VB2 to PLLA led to improved crystallinity and enhanced the molecular orientation of PLLA, resulting in a significantly enhanced output performance of the PLLA/VB2 nanogenerator. The proposed nanogenerator provides a maximum power density of 75.68 mW cm-3, which is approximately 28.7 times higher than that of pure PLLA nanogenerator. Moreover, the PLLA/VB2 nanogenerator exhibits good electrical responses under both mechanical and acoustic stimulations. The collected mechanical energy from the motion of human joints can power up several LEDs. The PLLA/VB2 nanogenerator can sensitively detect sound frequency from 1 to 27 kHz. Thus, it has great application potential in ambient mechanical and acoustic energy harvesting, wearable devices, and human–machine controlling systems.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction In recent decades, energy shortage and environmental pollution due to the excessive consumption of petrochemical resources have driven scientists to develop new energy sources that are efficient, clean, and sustainable [1, 2]. Currently, most of our energy demand is met by electricity, which is widely used for illumination and communication. Electrical
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https://doi.org/10.1007/s10853-020-05283-1
energy is commonly generated by a Faraday generator or supplied by rechargeable batteries. With the rapid development of wearable electronics, selfpowered energy sources that are flexible and biocompatible are highly desired. However, the traditional Faraday generator or chargeable batteries cannot meet such requirements owing to their large size, inflexibility, and the requirement of periodic charging, and these shortcomings significantly limit the advancement of wearable electronics. Therefore,
J Mater Sci
there is ongoing research on the development of novel generators and rechargeable batteries with high capacity, flexibility, and long lifetime toward miniaturization of wearable devices [3–6]. In 2006, Wang [7] developed the first piezoelectric nanogenerator based on piezoelectric zinc-oxide nanowire arrays that can harvest the surrounding ambient mechanical energy and convert it into electrical energy. Since then, various types of piezoelectric nanogenerators have been developed [8–11]. Most piezoelectric generators are based on inorganic or organic materials. The piezoelectric properties of inorganic piezoelectric materials, mainly
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