The development of a flexible wearable piezoelectric power device has recently caught extensive attention, especially in making inorganic piezoelectric ceramics into polymers from a composite with excellent piezoelectric response. As inorganic piezoelectric fillers, an oriented polycrystal can improve the mechanical energy efficiency of piezoelectric nanogenerators. Herein, the two-dimensional BaTiO 3 -oriented polycrystals are prepared via a two-step hydrothermal process based on a topochemical conversion mechanism. Additionally, a high-performance piezoelectric nanogenerator was successfully fabricated using the polydimethylsiloxane (PDMS) polymer and BaTiO 3oriented polycrystals. The flexible piezoelectric nanogenerator with 30 wt % BaTiO 3 exhibited optimal piezoelectric performance, with an output opencircuit voltage of 13.0 V and a short-circuit current of 200 nA under a periodic mechanical bend−release mode. More importantly, an effective power of approximately 2.6 μW was achieved at a low load resistance of 35 MΩ, suggesting a large potential for applications of electronic skins and self-powered devices. The device efficiently harvests biomechanical energy from human activities and exhibits stable output voltage and current of approximately 8 V and 150 nA, respectfully, demonstrating great promise as a wearable energy harvester. This work demonstrates that oriented nanocrystals in combination with a polymer matrix can lead to the design of high-efficiency piezoelectric nanogenerators that are particularly useful in artificial intelligence, soft robotics, and biomedical devices.

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A simple and efficient one‐pot method has been developed for the synthesis of α‐aminonitriles from aldehydes, amines and tributyltin cyanide in the presence of a catalytic amount of iodine with high yields. The reactions proceeded smoothly at room temperature via very simple procedure.