Flexible biocompatible mechanical energy harvesters are drawing increasing interest because of their high energy-harvesting efficiency for powering wearable/implantable devices. Here, a type of "self-matched" tribo-piezoelectric nanogenerators composed of genetically engineered recombinant spider silk protein and piezoelectric poly(vinylidene fluoride) (PVDF)-decorated poly(ethylene terephthalate) (PET) layers is reported. The PET layer serves as a shared structure and electrification layer for both piezoelectric and triboelectric nanogenerators. Importantly, the PVDF generates a strong piezo-potential that modifies the surface potential of the PET layer to match the electron-transfer direction of the spider silk during triboelectrification. A "vapor-induced phase-separation" process is developed to enhance the piezoelectric performance in a facile and "green" roll-to-roll manufacturing fashion. The devices show exceptional output performance and energy transformation efficiency among currently existing energy harvesters of similar sizes and exhibit the potential for large-scale fabrication and various implantable/wearable applications.

中文翻译：

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使用蒸汽诱导的相分离聚偏二氟乙烯和重组蜘蛛丝的“自匹配”摩擦/压电纳米发电机。

柔性的生物相容性机械式能量收集器因其为可穿戴/可植入设备提供动力的高能量收集效率而受到越来越多的关注。在此，报道了一种由基因工程重组蜘蛛丝蛋白和压电聚偏二氟乙烯（PVDF）装饰的聚对苯二甲酸乙二酯（PET）层组成的“自匹配”摩擦压电纳米发电机。PET层用作压电和摩擦纳米发电机的共享结构和带电层。重要的是，PVDF产生了强大的压电势能，该压电势能在摩擦带电过程中改变PET层的表面电势以匹配蜘蛛丝的电子传输方向。“蒸气诱导的相分离” 开发了一种工艺来提高压电性能，并且以一种容易的，“绿色”的卷对卷制造方式。该设备在当前现有的类似尺寸的能量收集器中显示出出众的输出性能和能量转换效率，并具有大规模制造和各种可植入/可穿戴应用的潜力。