Immobilization of heterogeneous Keggin and Wells-Dawson type polyoxometalates on Biomass-derived activated carbon for energy storage applications

Abstract

The electrochemical performance of combined Keggin and Wells-Dawson-type polyoxometalates supported on biomass-derived pomegranate peel-derived activated carbon (PDAC) is investigated in depth. The electrodes are fabricated by impregnating the vanadium-substituted Wells-Dawson and Keggin-type polyanions into the PDAC. These novel nanohybrid materials are examined to uncover their structural and electrochemical characteristics. The PDAC's high adsorption capacity and large surface area enhance the performance and stability of the polyanions. Additionally, the polyanions exhibited strong redox properties, thereby significantly enhancing the device's charge-storage capacity. The 20 wt% PDAC-P 2 VMo 17 /PVMo 11 composite demonstrates superior electrochemical performance, achieving a high specific capacitance of 234.4 F g -1 , along with impressive energy and power densities of 32.55 Wh Kg -1 and 1999 W Kg -1 , respectively. Furthermore, practical applications are explored, including using this material to power LED bulbs, demonstrating its potential for real-world use.