With an increasing global energy demand, along with a rising uptake of portable electronic devices, it is of great importance to investigate the viability of alternative energy harvesting technologies. Flexible piezoelectric generators (PEGs) are able to convert mechanical energy to electricity, making them an ideal candidate to decrease reliance on conventional energy sources and to power flexible, portable and implantable electronics. In this study, we show a low-energy production pathway for transparent PEGs based on poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) via shear-induced alignment of its dipoles through extrusion printing, complemented by spatial dipolar templating onto single-walled carbon nanotubes (SWCNTs) at low concentrations (<0.05 wt%). The resulting composite PEGs show up to a 500% enhancement in the piezoelectric charge coefficient d₃₃ relative to extrusion printed pristine PVDF-TrFE, with similar enhancements in energy harvesting, exhibiting a power density of up to 20 μW cm⁻³ at 0.02 wt% SWCNTs. The extrusion printed composite PEGs show recyclability using only a green solvent (acetone) and are found to exhibit piezoelectric energy harvesting with a power density of up to 71 μW cm⁻³ upon reprinting, overcoming two of the most significant hurdles towards commercial production of flexible PEGs.

中文翻译：

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通过单壁碳纳米管模板印刷的可回收和自极化聚合物压电发电机

随着全球能源需求的增加，以及便携式电子设备的日益普及，研究替代性能源收集技术的可行性至关重要。柔性压电发电机（PEG）能够将机械能转换为电能，使其成为减少对传统能源的依赖并为柔性，便携式和可植入电子设备供电的理想选择。在这项研究中，我们展示了基于聚透明的PEG（偏二氟一低能源生产途径共同-trifluoroethylene）（PVDF-TrFE的）通过通过挤出印刷，其偶极子的剪切诱导排列，辅以低浓度（<0.05 wt％）的单壁碳纳米管（SWCNT）上的空间偶极子模板。相对于挤出印刷的原始PVDF-TrFE，所得复合PEG的压电电荷系数d ₃₃最高提高500％，同时能量收集也得到类似的提高，在0.02 wt％时显示出高达20μWcm ^-3的功率密度碳纳米管。挤出印刷的复合PEG仅使用绿色溶剂（丙酮）即可显示出可回收性，并且发现其压电能量收集的功率密度高达71μWcm ^-3 重印后，克服了向柔性PEG商业化生产的两个最重要的障碍。