Abstract
Platinum–nickel (Pt–Ni) bimetallic nanoframes with three-dimensional (3D) electrocatalytic surfaces are used as counter electrodes (CEs) for the dye-sensitized solar cell (DSSC). Cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization characterizations indicate that the Pt3Ni CE has a high catalytic activity for the reduction of triiodide to iodide and a low charge transfer resistance at the electrolyte/electrode interface. The DSSC based on the Pt3Ni CE achieves an enhanced photovoltaic conversion efficiency of 7.75% compared to that using the thermal decomposition Pt CE (7.26%) under full sunlight illumination (100 mW cm−2, AM1.5 G) due to the catalytic surfaces of this 3D hollow rhombic dodecahedron nanoframes are composed of the Pt-rich structure.
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