“…For EDLCs, charge storage is based on the charge separation at an electrode/electrolyte interface, but pseudocapacitors store charges arising from faradaic reactions at the electrode surface. 3,4,6,7,12 In the last few decades, researchers have focused on the development and enhancement of the capacity and energy density of supercapacitors. Transition metal oxides and hydroxides, such as MnO 2 , Fe 2 O 3 , V 2 O 5 , MoO 3 , NiO, Co 3 O 4 , Ni(OH) 2 , and Co(OH) 2 are promising electrode materials in view of their multiple oxidation states for pseudocapacitor generation.…”