These unconventional harvesting ways can save the environment and make the user's lives safer. [7,8] After the evolutional change made by Z. L. Wang group in the field of energy harvesting as tribo-electric nanogenerators (TENGs), [9] plenty of research has been conducted to improve the efficiency, power-generation, and biocompatibility. [6,10,11] Moreover, as a more durable, highly stable, efficient, and excellently sensitive device, the piezo-electric nanogenerators (PENGs) [5] are also getting more and more attention these days. The electrical energy can easily be generated from TENG/PENG by mechanical motions originated from wind, ocean, and human body actions. Up to the date, remarkably high voltage, current, and power has been achieved from these technologies along with easy fabrication, light weight, and excellent durability. [12] The researchers have previously reported many laboratory synthesized materials (ZnO, ZnSnO 3 , SrTiO 3 , BaTiO 3, etc.) for the piezo-and TENGs. [13][14][15] However, these synthesized materials seriously muddle the natural environment because of the toxic behavior and expensive synthetic processes. [7,8,16] Extensive research has been done so far to study the piezoelectric effect in natural materials. [17] The piezo-electricity in the bio-materials has been reported previously in silk, [18] bacteriophages, [19] eggshell membrane, [20] chitin, [21] and collagens. [22] Among these materials, the collagen fibrils are abundant in organic tissues, fruits, vegetables, and other plants. The intermolecular hydrogen bonding in the collagen fibrils creates a uniaxial orientation of the molecular dipoles responsible for To mitigate future global energy challenges, it is vital to utilize natural resources to harness sustainable and environmentally-friendly energy. This paper explores the tribo-and piezo-electric functionalities of tomato peel (TP) to fabricate a nature-driven hybrid nanogenerator. Tomato is one of the most cultivated vegetables globally, however, a significant amount of TP is disposed after utilization in the food processing industries. The TP possesses a natural hierarchically placed highly porous structure, which is helpful to enhance the output performance of both piezo-and tribo-electric devices. This work shows that a TP based piezo-electric nanogenerator can produce an open circuit voltage of 24.5 V, short circuit current of 2.5 µA, and maximum instantaneous power of 19.5 µW. In addition, the TP based tribo-electric nanogenerator generates open circuit voltage, short circuit current, and instantaneous power of 135 V, 81 µA, and 3750 µW, respectively. Combining two NGs functionalities, the proposed TP based tribo-and piezo-electric nanogenerator (TP-TPENG) shows enhanced output performance with the rectified open circuit voltage, short circuit current, and maximum instantaneous power of 150 V, 84 µA, and 5400 µW, respectively. These results show that the TP-TPENG can offer a new pathway toward bio-based nanogeneration and self-powered sensing green technologies.
