Synthesis of low-cost and high electrochemical activity material to regenerate electrolytes and to enhance the efficiency (counter electrodes (CE)) is of paramount area for the Dye Sensitised Solar Cells. Tungsten disulfide (WS₂) quantum dots incorporated Cobalt Ferrite (CoFe) nanocubes composites were prepared by a simple ultra-sonication process, where WS₂ quantum dots and CoFe were synthesized by hydrothermal method and precipitation method, respectively. The morphology of WS₂/CoFe composites was investigated by FE-SEM, and HR-TEM analysis, where the CoFe sample showed nanocubes. By adding different mass ratio of WS₂ quantum dots (WS₂/CoFe-1, WS₂/CoFe-2, WS₂/CoFe-3), the morphology of CoFe nanocubes has turned into hollow nanoboxes. The electrochemical (Cyclic voltammetry) and charge transport properties (Electrochemical impedance spectroscopy) were studied by using a three-electrode system. The (WS₂/CoFe -2) Counter Electrode shows better catalytic activity when compared with other Counter Electrodes owing to more exposed edge sites with well-defined interior voids. The WS₂/CoFe -2(3.0%) showed better photovoltaic power conversion efficiency which was 2 times higher than the CoFe Counter Electrode (1.43%) based DSSCs.

Key words: Counter electrode, Pt- free, Dye-Sensitised Solar cell