Preparation and comparison of hybridized WO₃–V₂O₅ nanocomposites electrochemical supercapacitor performance in KOH and H₂SO₄ electrolyte

The rod shape WO₃–V₂O₅ hybrid nanocomposites were prepared by microwave assisted wet chemical route. The electrochemical investigations of as-prepared composites were carried in two electrolytes such as KOH and H₂SO₄ for comparison. Their maximum capacitance was calculated as 44 F/g for WO₃ and 173 F/g for WO₃–V₂O₅ composites in KOH electrolyte and its efficiency is 100% up to 5000 cycles and its capacitance retention is ∼126% in KOH electrolyte. In H₂SO₄ electrolyte, the specific capacitance of WO₃ was recorded as 246 F/g and WO₃–V₂O₅ showed poor performance such as less than 12 F/g.