Hybrid solid-state supercapacitors based on AC/MnO2 cotton fabric electrodes

One of the current trends in research in the field of supercapacitors is focused on the utilization of more flexible, low-cost and environmentally friendly materials and methods of production. Accordingly, it exists a strong interest in the integration of textiles as support of flexible, low-cost and green electrodes for wearable supercapacitors [1]. On the other hand, high surface area activated carbon (AC) based electrodes together with neutral aqueous electrolytes have been extensively studied in supercapacitors to increase their energy density and maximum operating voltage, and their capacitive limits seem that have been widely reached [2]. It is for this reason that some metal oxides with improved properties thanks to their fast reversible surface processes of faradaic type have been identified [3] and asymmetric supercapacitors made of electrodes based on AC and metal oxides have shown higher performance than the classic type of AC/AC symmetric supercapacitors. It is in this context that this work introduces some results (i. e. cyclic voltammetry, galvanostatic charge-discharge, electrochemical impendance spectroscopy, etc.) of an hybrid and asymmetric supercapacitor consisting of MnO2 and AC electrodes produced with cotton fabric as starting substrate and a polymer electrolyte membrane.