Efficient Nickel Sulfide and Graphene Counter Electrodes Decorated with Silver Nanoparticles and Application in Dye Sensitized Solar Cells
We reported a facile two step electrochemical chemical approach for in situ growth of nickel sulfide and graphene counter electrode (CE) decorated with silver nanoparticles (signed NiS/Gr Ag) and served in dye sensitized solar cells (DSSCs) Under optimum conditions, the DSSC achieved a remarkable power conversion efficiency of 8.36 assembled with the NiS/Gr Ag CE, much higher than that based on the Pt CE (7.76 The surface morphology of NiS/Gr Ag CE exhibited a smooth surface with cross growth of NiS, graphene, and Ag nanoparticles, which was beneficial to the fast mass transport of electrolytes; increased the contact area of electrolytes and active materials; and enabled to speed up the reduction of triiodide to iodide. The research on the electrochemical properties also showed that the NiS/Gr Ag CE possessed lower charge transfer resistance and more excellent electrocatalytic activity in iodide/triiodide electrolyte compared to the Pt electrode.
Nanoscale Research Letters