Pseudocapacitive Performance of WO3/g-C3N4 Nanocomposites

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.