封面文章

力學(xué)

來源出版物：SCIENCE CHINA： Physics，Mechanics & Astronomy，2015，58（9）： 594601聯(lián)系郵箱：FENG Xue； fengxue@tsinghua.edu.cn

封面介紹：As rapid development in wearable/implantable electronic devices benefit human life medically in daily health monitoring and disease treatment，all kinds of flexible and/or stretchable electronic devices are booming，together with which is the demand of energy supply with similar mechanical property. Due to its ability in converting mechanical energy lying in human body into electric energy，energy harvesters based on piezoelectric materials are promising for applications of energy supply in wearable/implantable devices in a renewable，clean and life-long way. The cover image demonstrates a scenario of scavenging biomechanical energy of heartbeat by piezoelectric effect offered by flexible and biocompatible piezoelectric devices. More details about the mechanics of piezoelectrics in energy harvesting，including why piezoelectricity is the choice for minor energy harvesting to power the implantable/wearable electronics，up to date devices，theoretical model of the flexible thin film energy harvester based on PZT nanoribbons，as well as in vivo experiments of energy harvesting by integrating it with swine heart are reviewed and discussed.（See the article No. 594601 by CHEN Ying et al.）.

Mechanics of flexible and stretchable piezoelectrics for energy harvesting

CHEN Ying； LU Bing-wei； OU Da-peng； et al.

As rapid development in wearable/implantable electronic devices benefit human life in daily health monitoring and disease treatment medically，all kinds of flexible and/or stretchable electronic devices are booming，together with which is the demanding of energy supply with similar mechanical property. Due to its ability in converting mechanical energy lying in human body into electric energy，energy harvesters based on piezoelectric materials are promising for applications in wearable/implantable device's energy supply in a renewable，clean and life-long way. Here the mechanics of traditional piezoelectrics in energy harvesting is reviewed，including why piezoelectricity is the choice for minor energy harvesting to power the implantable/wearable electronics and how. Different kinds of up to date flexible piezoelectric devices for energy harvesting are introduced，such as nanogenerators based on ZnO and thin and conformal energy harvester based on PZT. A detailed theoretical model of the flexible thin film energy harvester based on PZT nanoribbons is summarized，together with the in vivo demonstration of energy harvesting by integrating it with swine heart. Then the initial researches on stretchable energy harvesters based on piezoelectric material in wavy or serpentine configuration are introduced as well.

piezoelectric effect； energy harvesting； flexible electronics； stretchable electronics