Two-dimensional Hexagonal Boron Nitride Nanosheet–Polycarbonate Composite Ink-Based Printed Flexible Triboelectric Nanogenerator for Scavenging Mechanical Energy AITranslate

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DOI：https://doi.org/10.1021/acsaelm.3c00712

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In the modern world, the rapid depletion of conventional energy sources demands urgent exploration of materials and methods for clean, efficient, and sustainable energy production. As a mechanical energy harvester, triboelectric nanogenerators (TENGs) have been investigated extensively in recent years due to their high power output, superior energy conversion efficiency, low cost, and ease of manufacturing. Herein, a high-performance flexible TENG is developed based on 2D-hexagonal boron nitride nanosheet (BNNS) ink printed on Mylar substrates as a triboelectric contact layer. The thixotropy of the BNNS dispersion was controlled by polycarbonate (PC) and other suitable organic additives. Further, the formulation was modified into a versatile ink (BN-PC ink) suited for screen printing. Remarkably, the flexible screen-printed TENG (FS-TENG) fabricated using BN-PC ink as a tribonegative material, paired with the printed polyvinylpyrrolidone (PVP) on Mylar as a tribopositive material, demonstrated a very high voltage of ∼800 V and a short-circuit current density of ∼0.78 mA/m2, respectively, under an actuating force of ∼10 N with 5 Hz frequency. The FS-TENG has shown an impressive power density of ∼1.36 W m–2 at 200 MΩ resistive load, which is ∼7 times higher than that of the TENG without BNNSs. Further, the fabricated FS-TENG device is demonstrated for powering electronic gadgets such as digital thermometers, calculators, and light-emitting diodes (LEDs) with a mere finger-tapping force of ∼5 N.