ZIF-8-derived hierarchical ZnO nanoplates anchored to low-density carbon fabric: Highly flexible supercapacitors with wide potential windows

초록

Flexible supercapacitors are preferred for small wearable electronics owing to their sustainability and high power density. These systems can be fabricated using low-density conductive flexible carbon materials which are primarily obtained using cotton fabrics. For instance cotton-fabric-derived carbon cloth comprises a three-dimensional network of conductive fibers that can hierarchically accommodate electrochemically active materials. In this context the present article reports the decoration of a cotton fabric with two-dimensional ZIF-8 nanoplates by wet chemical impregnation followed by high-temperature annealing. Tailoring the ratio of the zinc salt to 2-methylimidazole enhances the exposure of electrochemically active sites. The optimal specimen exhibits the highest capacitance among the samples (982.8 mF cm−2) as ascertained by cyclic voltammetry at a scan rate of 10 mV s−1 whereas in terms of electrochemical stability it shows a capacitance retention of 91% after 10000 galvanostatic charge–discharge cycles. Furthermore in a potential window of 0–1.6 V ZnO nanoplates anchored to low-density carbon fabric aids in storing an energy density of 261.3 μW h·cm−2 at a high power density of 11.2 mW cm−2. © 2024 Elsevier B.V.

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