“…A vast variety of materials have been investigated as a cathode material for fabricating asymmetric supercapacitors, which include nanostructured carbonaceous materials, polymers, and transition metal oxides. [8][9][10][11][12][13][14][15][16][17][18] In particular, considerable research attention has been focused on metal oxides, 1,[19][20][21][22][23] due to ease of preparation with controllable nanostructured morphology and their fast reversible Faradaic reactions, which result in a relatively high energy density.…”