Abstract
Nanocomposites of iron disulfide (FeS2) and molybdenum disulfide (MoS2) with nanosheets structure were successfully grown on the flexible titanium foils through a facile one-step hydrothermal process, and then worked as counter electrodes (CEs) in the dye-sensitized solar cells (DSSCs). X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometer were employed to characterize the microstructure and composition of the FeS2/MoS2. Cyclic voltammogram reveals that the catalytic activity of FeS2/MoS2 CE is higher than that of FeS2, MoS2, and platinum (Pt) CEs towards triiodide/iodide (I3–/I–) redox electrolyte, owing to the superior carrier transfer properties of vertical array structure and abundant catalytic active sites of FeS2/MoS2 nanosheets. Moreover, the FeS2/MoS2 CE maintains its activity after 500 cycles, exhibiting excellent electrochemical stability. Furthermore, the power conversion efficiency (PCE) of FeS2/MoS2 CE reaches 8.67%, which is higher than that of the FeS2 (7.20%), MoS2 (7.38%) and Pt (8.16%) CEs.
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