An Omnidirectionally Stretchable Piezoelectric Nanogenerator Based on Hybrid Nanofibers and Carbon Electrodes for Multimodal Straining and Human Kinematics Energy Harvesting,Advanced Energy Materials

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An Omnidirectionally Stretchable Piezoelectric Nanogenerator Based on Hybrid Nanofibers and Carbon Electrodes for Multimodal Straining and Human Kinematics Energy Harvesting
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-09-18 , DOI: 10.1002/aenm.201701520
Saqib Siddiqui ₁ , Han Byeol Lee ₁ , Do-Il Kim ₁ , Le Thai Duy ₁ , Adeela Hanif ₁ , Nae-Eung Lee _{1,

2,

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Affiliation

Stretchable piezoelectric nanogenerators (SPENGs) for human kinematics energy harvesting have limited use due to the low stretchability or mechanical robustness and the difficulty of structural design for omnidirectional stretchability. This study reports an efficient, omnidirectionally stretchable, and robust SPENG based on a stretchable graphite electrode on a 3D micropatterned stretchable substrate and a stacked mat of piezoelectric nanofibers. The stacked mat of free‐standing nanofibers is alternatively composed of nanocomposite nanofibers of barium titanate nanoparticles embedded in polyurethane and poly(vinylidene fluoride‐trifluoroethylene) nanofibers. The nanofiber SPENG (nf‐SPENG) exhibits a high stretchability of 40% and high mechanical durability up to 9000 stretching cycles at 30% strain, which are attributed to the stress‐relieving nature of the 3D micropattern on the substrate and the free‐standing stacked hybrid nanofibers. The nf‐SPENG produces a peak open circuit voltage (V_oc) and short circuit current (I_sc) of 9.3 V and 189 nA, respectively. The nf‐SPENG is demonstrated to harvest the energy from human kinematics while walking when placed over the knee cap of a subject, generating a maximum V_oc of 10.1 V. The omnidirectional stretchability, efficiency, facile fabrication process, mechanical durability, environmentally friendly lead‐free components, and response to multimodal straining make this device suitable for self‐powered wearable sensing systems.

中文翻译：

基于混合纳米纤维和碳电极的全向可拉伸压电纳米发电机，用于多峰应变和人体运动学能量收集

用于人体运动学能量收集的可拉伸压电纳米发电机（SPENGs）由于其低拉伸性或机械坚固性以及全向拉伸性的结构设计困难而受到限制。这项研究报告了基于3D微图案可拉伸基板上的可拉伸石墨电极和压电纳米纤维堆叠垫的高效，全向可拉伸且坚固的SPENG。独立式纳米纤维的堆叠垫可以由嵌入在聚氨酯中的钛酸钡纳米颗粒的纳米复合纳米纤维和聚偏二氟乙烯-三氟乙烯纳米纤维组成。纳米纤维SPENG（nf-SPENG）在30％应变下表现出40％的高拉伸性和高达9000拉伸循环的高机械耐久性，这归因于3D微型图案在基材上的应力释放特性以及独立的堆叠式混合纳米纤维。nf-SPENG产生峰值开路电压（V _oc）和短路电流（I _sc）分别为9.3 V和189 nA。nf-SPENG被证明可在走路时置于人体的膝盖上，从人体运动学中收集能量，最大V _oc为10.1V。全向拉伸性，效率，便捷的制造工艺，机械耐用性，环保的铅无组件，对多模态应变的响应使该设备适用于自供电的可穿戴传感系统。

更新日期：2017-09-18

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