Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Abstract: Bi2O3 nanocrystals were grown on carbon nanotubes through hydrothermal decomposition method with Bi(NO3)3-5H2O as raw material and carboxylated carbon nanotubes as substrate, and then Bi2S3 and Bi2Se3 crystals were prepared using thioacetamide (TAA) and selenium powder as sulfur and selenium sources to produce bismuth chalcogenides/carbon nanotubes composite (Bi2X3/CNT, X=O, S, Se). By using 3D printing technique, interdigital electrode pattern substrate was fabricated from silicone rubber, and flexible on-chip micro-supercapacitors were assembled with Bi2X3/CNT as electroactive materials. The results indicated that the areal capacitances of Bi2O3@CNT, Bi2S3@CNT and Bi2Se3@CNT reached 805.5 mF/cm2, 1 232.5 mF/cm2 and 1 556.8 mF/cm2 at a current density of 2 mA/cm2, respectively, and the capacitances maintained 83.2%, 80.9% and 90.0% after 10 000 cyclic voltammetry tests. The output voltage could be expanded up to 3 folds by connecting three miniature capacitors in series, and the capacitance showed 3 folds increase when connecting three supercapacitors in parallel, which exhibited excellent expandability.
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2025, Vol. 39 
