Abstract
Flexible supercapacitors are highly attractive for the large number of emerging portable lightweight consumer devices. The novelty of a flexible supercapacitor is the incorporation of flexible electrode or substrate material to combine structural flexibility with the inherently high power density of supercapacitors. Flexible supercapacitors can use non-Faradaic energy storage process as seen in the electric double layer capacitor type or a Faradaic mechanism as seen in the pseudocapacitors. In this review, we account the current progress in pseudocapacitive electrode materials, fabrication techniques and new materials for electric double layer capacitor, and different flexible substrates. Future directions in developing new materials towards improved energy density and cost-effectiveness of the flexible supercapacitors and their usage in combination with lithium-ion batteries are highlighted.
Highlights
Flexible energy storage devices are fundamental to the development of next-generation wearable, compact, and portable electronics for medical, military, and civilian applications e.g., flexible displays on phones, health tracking devices, computers, and televisions (Ko et al, 2017)
We have summarized the recent progress in the development of novel electrode materials of high specific supercapacitance for both electric double-layer capacitors (EDLCs) and PC flexible supercapacitors
Ternary and higher order nanostructures of metal oxides, layered structure transition metal chalcogenides, metal molybdates, vanadium nitride, and polyoxometalate-MnO2 have proved attractive for PC electrodes
Summary
Flexible energy storage devices are fundamental to the development of next-generation wearable, compact, and portable electronics for medical, military, and civilian applications e.g., flexible displays on phones, health tracking devices, computers, and televisions (Ko et al, 2017). A wide range of new pseudocapacitive electrode materials has been investigated with the aim of increasing the energy density of flexible supercapacitors. The device showed excellent cyclic stability, suggesting that this NiCo2O4-GO electrode material is highly suitable for fabrication of variable temperature and high performance flexible supercapacitor devices.
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