LDH, Polyoxometalate And Graphene Oxide For Supercapacitor Application

At present worldwide conditions of energy crises, efficient energy conversion and storage systems are most needed. Accordingly, HSC cells are proposed that comprise one EDLC-type and other battery-type electrodes. Thus, HSC can deliver a high power, short charging-discharging periods, ED comparable to the batteries, and long cycle life. In this regard, present work is focused on improving electrode performance of Co-Cr-LDH by hybridizing it with various nanostructures to enable high surface area, accessible gallery space, and improved conductivity. The Co-Cr-LDH-based nanohybrids were prepared by self-assembly between the positively charged Co-Cr-LDH Ns and POV, POW anions, and GO Ns. The Co-Cr-LDH Ns nanohybrids with POV anions, POW anions, and GO Ns were denoted as CCV, CCW, and CCG, respectively. The hydrothermally prepared rGO was used as an EDLC-type negative electrode in HSCs. Consequently, the three types of HSCs are fabricated with cell configuration CCV-2¿rGO, CCW-2//rGO and CCG-2//rGO. The observed electrochemical performances concluded that GO NSs are the best choice for hybridization with Co-Cr-LDH to enhance electrode performance.