<p>In this study, hydrated tungsten oxide quantum dots (WO₃QDs) were synthesized using an electrochemical oxidation process, followed by thermal treatment via conventional and microwave heat treatment. The conventional and microwave treatments were carried out at 150°C for 45 and 8 min, respectively. The average heating rates of conventional and microwave heat treatment are 5.1 and 20.3°C min⁻¹, respectively. Heat treatment resulted in partial dehydration of hydrated WO₃QDs and generated oxygen vacancies in the lattice. Electrochemical response of as-synthesized, conventionally heat-treated, and microwave-treated WO₃QDs was measured using 1 M H₂SO₄ as electrolyte. In general, microwave-treated WO₃QDs showed better cyclic voltammetry characteristics as compared to conventionally heat-treated samples. Highest specific capacitance of 412.4 Fg⁻¹ was achieved for the microwave-treated sample at a scan rate of 10 mVs⁻¹. Correspondingly, high energy density (56.3 Whkg⁻¹) and high power density (3060 Wkg⁻¹) was noted for microwave-treated samples. The chronopotentiometry response of all samples dominantly exhibited diffusion-controlled behaviour with very small IR drop. These findings indicate that microwave-treated WO₃QDs are effective electrode materials and can be considered suitable for enhancing the performance of supercapacitors.</p>