Solid State Supercapacitors Based on Manganese Dioxide Thin FilmsIn recent years, transition metal oxide thin film materials have great attention due to their unique physical and chemical properties. The porous nanostructured morphology and wide potential window of electrode materials are very important aspects for supercapacitor applications. Therefore, transition metal oxides composite with graphene oxide are widely used for gas sensing, electrocatalyst, solar cell, photocatalyst, glucose sensing, energy conversion and supercapacitor applications. Among, the transition metal oxides composite with graphene oxide is considered as the best candidate for electrode material in flexible solid state supercapacitor devices due to multiple oxidation states, better redox activity, wide potential window and excellent area under the curve. The present book describes flexible solid state manganese dioxide with graphene oxide thin films electrodes deposited by successive ionic layer adsorption and reaction (SILAR) and chemical bath deposition (CBD) methods. This research highlighted the crucial role of synthesis methods and flexible solid state electrode materials for supercapacitors.