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Petal-like cobalt selenide nanosheets used as counter electrode in high efficient dye-sensitized solar cells
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Petal-like cobalt selenide nanosheets used as counter electrode in high efficient dye-sensitized solar cells
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Journal Article
Petal-like cobalt selenide nanosheets used as counter electrode in high efficient dye-sensitized solar cells
2015
Overview
A petal-like cobalt selenide nanosheets (Co
0.85
Se) is prepared by hydrothermal method and used as an efficient Pt-free counter electrode (CE) for dye-sensitized solar cells (DSSCs). Field emission scanning electron microscopy observes that the petal-like Co
0.85
Se possess porous and large specific surface area, which benefits the enhancement of electrocatalytic activity. Cyclic voltammogram measurement indicates that Co
0.85
Se electrode has larger current density than Pt electrode. Electrochemical impedance spectroscopy shows that the Co
0.85
Se electrode with optimal condition has low charge-transfer resistance of 0.79 Ω cm
2
. Under simulated solar light irradiation with intensity of 100 mW cm
−2
(AM 1.5), the DSSC based on the Co
0.85
Se CE achieves a power conversion efficiency of 8.00 %, which is slightly higher than the solar cell based on the Pt CE (7.83 %).
Publisher
Springer US,Springer Nature B.V
