Herein, a fully sustainable, flexible, and bio-based piezoelectric-cum-triboelectric energy harvester has been developed using a simple commodity cotton fabric. In the present study, a novel attempt has been made to prepare a piezoelectric and triboelectric energy harvester in a combined manner from the same fabric substrate. The developed mercerized cotton fabric-based energy harvester has shown a significant open-circuit peak-to-peak voltage of ∼47 V and current of ∼1 μA, simply by finger tapping (under a higher amount of pressure). The same device generated an open-circuit peak-to-peak voltage and short-circuit current of 1.77 V and 100 nA, respectively, in response to impact forces (20 N at 7 Hz frequency) applied using a customized force-imparting device. The reason for the enhanced energy of the device made of mercerized fabric has been correlated with structural characteristics of the fabrics. The piezoelectric response of the cotton fabric-based energy harvester has been observed mainly due to the strong intramolecular and intermolecular hydrogen bonds present in the cellulose chains. These strong hydrogen bonds act as strong dipoles inside the cotton fabric structure, for which the resultant dipole moment is very high. On the other hand, triboelectric response of the device is primarily due to the charges developed at the interfaces of a highly electropositive aluminum electrode and highly electronegative polypropylene (PP) of the respective encapsulated devices as per triboelectric series. The developed piezoelectric-cum-triboelectric energy harvester can successfully be utilized as an efficient wearable to power small-scale electronic gadgets.

中文翻译：

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包含简单商品棉织物的可持续，灵活的压电兼摩擦式能量采集器的开发

在此，已经开发了一种使用简单的商品棉织物的完全可持续，灵活且基于生物的压电兼摩擦式电能采集器。在本研究中，已进行了新颖的尝试，以从相同的织物基材上以组合方式制备压电和摩擦电动能量收集器。只需用手指轻敲（在较高压力下），已开发的基于丝光棉织物的能量收集器就显示出约47 V的显着开路峰峰值电压和约1μA的电流。响应于使用定制的力施加设备施加的冲击力（频率为20 Hz，频率为7 Hz），同一设备分别产生了1.77 V和100 nA的开路峰峰值电压和短路电流。由丝光织物制成的装置的能量增加的原因已经与织物的结构特性相关。已经观察到基于棉织物的能量收集器的压电响应，主要是由于存在于纤维素链中的强分子内和分子间氢键。这些强氢键在棉织物结构中充当强偶极子，为此，所产生的偶极矩非常高。另一方面，器件的摩擦电响应主要归因于按照摩擦电系列在各个封装器件的高电正性铝电极和高电负性聚丙烯（PP）的界面处产生的电荷。