Abstract
Electronic textiles have garnered significant attention as smart technology for next-generation wearable electronic devices. The existing power sources lack compatibility with wearable devices due to their limited flexibility, high cost, and environment unfriendliness. In this work, we demonstrate bamboo fabric as a sustainable substrate for developing supercapacitor devices which can easily integrate to wearable electronics. The work demonstrates a replicable printing process wherein different metal oxide inks are directly printed over bamboo fabric substrates. The MnO2–NiCo2O4 is used as a positive electrode, rGO as a negative electrode, and LiCl/PVA gel as a solid-state electrolyte over the bamboo fabrics for the development of battery-supercapacitor hybrid device. The textile-based MnO2–NiCo2O4//rGO asymmetric supercapacitor displays excellent electrochemical performance with an overall high areal capacitance of 2.12 F/cm2 (1,766 F/g) at a current density of 2 mA/cm2, the excellent energy density of 37.8 mW/cm3, a maximum power density of 2,678.4 mW/cm3 and good cycle life. Notably, the supercapacitor maintains its electrochemical performance under different mechanical deformation conditions, demonstrating its excellent flexibility and high mechanical strength. The proposed strategy is beneficial for the development of sustainable electronic textiles for wearable electronic applications.
Highlights
Electronic textiles have garnered significant attention as smart technology for next-generation wearable electronic devices
Among the various energy storage devices, thin and flexible supercapacitors are gaining more consideration for wearable electronics due to their salient features, such as excellent lifetime, lightweight, high power density, and their ability to deliver under mechanical deformation conditions[12,13,14]
Among the several reported Faradaic redox materials, the ternary metal oxide composite of M nO2-NiCo2O4 has proved its strong potential for high energy density s upercapacitors21,23. MnO2 and N iCo2O4 are well known pseudocapacitive and battery-like materials, respectively, which are extensively reported as excellent materials for energy storage applications[24]
Summary
Electronic textiles have garnered significant attention as smart technology for next-generation wearable electronic devices. Among the various energy storage devices, thin and flexible supercapacitors are gaining more consideration for wearable electronics due to their salient features, such as excellent lifetime, lightweight, high power density, and their ability to deliver under mechanical deformation conditions[12,13,14]. Their insufficient energy density still limits their use in practical applications. The NiCo2O4 with high conductivity can act as a backbone to support and provide an effective electrical connection to the MnO2, which improves the conductivity and active site density of the M nO2 component It may remarkably boost the overall electrochemical performance of the composite. Enormous active sites produce numerous redox reactions and facilitate the fast diffusion of electrolyte ions, long cycle life and high charge storage capability as compared to their solitary parts
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