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Abstract

Future electronic applications such as wearable electronics depend on the successful construction of energy storage devices with superior flexibility and high electrochemical performance. However, these prerequisites are challenging to combine: external forces often cause performance degradation while the trade-off between the required nanostructures for strength and electrochemical performance results only in energy storage. In this paper, we present a flexible supercapacitor design based on tannic acid (TA) and carbon nanotubes (CNTs) with a unique nanostructure. Here, TA is self-assembled on the surface of the CNTs by metal-phenolic coordination bonds which provides the hybrid film with both, high strength and high pseudocapacitance. Besides a 17 times increased mechanical strength of the final composite, the hybrid film simultaneously exhibits excellent flexibility and volumetric capacitance.