Electrospun Polyimide Nanofiber-Based Triboelectric Nanogenerator for Harvesting Energy at Elevated Temperatures Electrospun Polyimide Nanofiber-Based Triboelectric Nanogenerator for Harvesting Energy at Elevated Temperatures AITranslate

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DOI：https://doi.org/10.1021/acsaelm.2c00781

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The thermionic emission effect and the destruction of the polymer surface structure caused by elevated temperatures severely affect the electron transfer in triboelectric nanogenerator (TENGs); thus, previous studies on the performance of polymer-based TENGs at elevated temperatures have mainly focused on that below 200 °C. Polyimide (PI) with high thermal stability and excellent triboelectric negativity has been widely used in the TENG but lacks systematic investigation in high-temperature environments. Hence, we systematically evaluated the output performance of a polyimide nanofiber-based TENG (PINF-TENG) composed of an electrospun polyimide nanofiber (PINF) and copper foil at 25–250 °C. The PINF-TENG generated an open-circuit voltage of 60.83 V and a short-circuit current of 1.52 μA at 25 °C, and a peak power density of 17.36 mW/m2 was achieved on a 50 MΩ external load. The open-circuit voltage and short-circuit current decreased sharply with the increase of temperature, while the optimal load resistance increased, which has not been reported in previous studies of polymer-based TENGs. In addition, the PINF-TENG can still maintain 25.48% of the voltage and 23.03% of the current at 250 °C with regard to those at 25 °C, which can stably charge the capacitor and drive 20 commercial green light-emitting diodes (LEDs). Therefore, this PINF-TENG has great application prospects for harvesting energy and sensing motion in hot gas, space, and many other high-temperature environments.