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Construction of Flexible Piezoceramic Array with Ultrahigh Piezoelectricity via a Hierarchical Design Strategy |
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| Authors: | Qianqian Xu Zhenxing Wang Junwen Zhong Minyang Yan Senfeng Zhao Jiangshan Gong Kaiyu Feng Jianxun Zhang Kechao Zhou Jianbin Xie Hui Xie Dou Zhang Yan Zhang Chris Bowen |
| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083 China;2. Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008 China
Angmedicine Research Center of Central South University, Changsha, Hunan, 410008 China Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008 China National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008 China;3. Department of Electromechanical Engineering and Centre for Artificial Intelligence and Robotics, University of Macau, Macau, SAR, 999078 China;4. Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083 China;5. ZhongKe Help Innovation Academy of Intelligence Science and Technology, Changsha, Hunan, 410083 China;6. Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008 China;7. Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY UK |
| Abstract: | The µW-level power density of flexible piezoelectric energy harvesters (FPEHs) restricts their potential in applications related to high-power multifunctional wearable devices. To overcome this challenge, a hierarchical design strategy is proposed by forming porous piezoceramics with an optimum microstructure into an ordered macroscopic array structure to enable the construction of high performance FPEHs. The porous piezoceramic elements allows optimization of the sensing and harvesting Figure of merit, and the array structure causes a high level of effective strain under a mechanical load. The introduction of a network of polymer channels between the piezoceramic array also provides increased device flexibility, thereby allowing the device to attach and conform to the curved contours of the human body. The unique hierarchical piezoceramic array architecture exhibits superior flexibility, a high open circuit voltage (618 V), high short circuit current (188 µA), and ultrahigh power density (19.1 mW cm?2). This energy density value surpasses previously reported high-performance FPEHs. The ultrahigh power flexible harvesting can charge a 0.1 F supercapacitor at 2.5 Hz to power high-power electronic devices. Finally, the FPEH is employed in two novel applications related to fracture healing monitoring and self-powered wireless position tracking in extreme environments. |
| Keywords: | aligned pores piezoelectric ceramics piezoelectric energy harvesting piezoelectric sensing |