Dear Arvind Kumar Mishra Spray pyrolysis can be used to produce Vanadium Pentoxide by spraying a certain quantity of Ammonium Metavanadate (NH4VO3) solution. A more effective laboratory process entails the decomposition of ammonium metavanadate at temperatures ranging from 500 to 550 °C.
The most often used electrolyte is aqueous Na2SO4. Most people, on the other hand, prefer the usage of aqueous electrolytes (eg. 1M H2SO4, 6M KOH, etc.). Alternatively, if you want a supercapacitor with a high energy density, you may employ organic electrolytes or ionic liquids. If you ever want to build a cost-effective and environmentally friendly supercapacitor, salt-based aqueous electrolytes such as Li2SO4, Na2SO4, and K2SO4 may be a preferable option. Also, metal oxides are not unstable in acidic electrolytes. ZnO, for example, is soluble in both acidic and alkaline electrolytes. If you want to enhance the energy density of your device, you may need to use electrolytes with wide potential windows.