Abstract

The study focuses on MnCO3/reduced graphene oxide (rGO) composite to investigate its capability against reduction of triiodide (I3⁻), and hence to utilise its potential as a platinum free electrode in dye-sensitized solar cells (DSSCs). The MnCO3/rGO composites were prepared with varying weight percentages of rGO to identify the optimal configuration to attain enhanced catalytic performance. The MnCO3/rGO 75wt% composite exhibited the optimal catalytic reaction kinetics for converting triiodide (I3⁻) to iodide (I⁻), achieving a photon to electron conversion efficiency (PCE) of 6.62%, with a photocurrent density (Jsc) of 13.29mAcm⁻², voltage (Voc) of 0.76V, and a fill factor (FF) of 0.65 at without load. This output performance is on par with that of to that of a conventional platinum (Pt) Counter Electrode, which achieved a PCE of 6.98%. The findings indicate that MnCO3/rGO 75wt% composite shows significant promise, cost-effective alternative to Pt, offering efficient performance and improved material sustainability.

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