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. 2022 Feb 17;13:938. doi: 10.1038/s41467-022-28575-3

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© The Author(s) 2022, corrected publication 2022

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Fig. 4 — a Output voltage and current signals of solution-based TI-TENGs with various coating doses of Bi₂Te₃ NP colloid from 2 to 16 mL. b Output voltage and current signals of the solution-based TI-TENGs with various areas from 1 × 1 to 5 × 5 cm². c Output properties of the solution-based TI-TENG (8 mL, 5 × 5 cm²) depending on different operating frequencies. d Output voltage and current signals (i) of the solution-based TI-TENG as a function of various resistances, also the corresponding output power (ii) under different measurement frequencies. e Comparison plots of the output power density among previously reported TENGs based on (i) emerging nanomaterials, (ii) conventional materials, and TIs (Bi₂Te₃ and Bi₂Se₃). f Optical image of the (i) in-series LEDs and (ii) LEDs lit by a solution-based TI-TENG. g Endurance test of the TI-TENG under the continuous operation of (i) 5000 and (ii) 20,000 cycles. Source data are provided as a Source Data file.