Pseudocapacitive Performance of WO₃/g-C₃N₄ Nanocomposites

Abstract

Hexagonal tungsten oxide (WO 3 ) holds great promise as an electrode material for pseudocapacitors due to its earth abundance, low cost, multiple oxidation states, high packing density (>7 g cm -3 ) and electrochemical reversibility. Here, we present the development of flexible electrodes consisting of WO 3 nanoflowers supported on graphitic carbon nitride (g-C 3 N 4 ) foams. The WO 3 /g-C 3 N 4 electrodes were prepared via a facile solvothermal approach followed by carbonization. The resulting WO 3 /g-C 3 N 4 electrodes have demonstrated excellent performance with specific capacitance of 1130 F g -1 at 0.5 A g -1 and good cyclic stability of 95% after 4,000 cycles in 0.5M H 2 SO 4 electrolyte.