Reduced Graphene Oxide/Cobalt Sulfide/ Titinum-Zirconiate for Dye-Sensitized Solar Cell

M. Atia, Doaa; Ahmed, Ninet Mohamed; abou hammad, Ali Belal; Toraya, Marwa M.; El Nahrawy, Amany M.

doi:10.21608/ejchem.2024.314249.10258

	Reduced Graphene Oxide/Cobalt Sulfide/ Titinum-Zirconiate for Dye-Sensitized Solar Cell
Egyptian Journal of Chemistry
Volume 68, Issue 5, May 2025, Page 419-430 PDF (4.12 MB)
Document Type: Original Article
DOI: 10.21608/ejchem.2024.314249.10258
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Authors
Doaa M. Atia ¹; Ninet Mohamed Ahmed²; Ali Belal abou hammad ³; Marwa M. Toraya⁴; Amany M. El Nahrawy ⁵
¹Photovoltaic Cells Department, Electronics Research Institute
²Photovoltaic Cells Department, Electronics Research Institute, Cairo, Egypt
³Solid State Physics Department, Physics Research Institute, National Research Centre, 33 El Bohouth St, Giza Dokki 12622, Egypt
⁴Photovoltaic Cells Department, Electronics Research Institute, 11843, Cairo, Egypt
⁵Solid State Physics Department, Physics Research Division, National Research Centre (NRC)-33 El Bohouth St. Dokki, P.O.12622, Egypt
Abstract
Exploiting cost-effective Pt-free counter-electrode materials with low-cost synthesis and high catalytic activity is crucial for dye-sensitized solar cells. This paper introduces the sol-gel drop casting approach for preparing cobalt sulfide-doped graphene (CoS/rGO). The cobalt sulfide-doped graphene nanocomposite exhibits electrocatalytic properties comparable to conventional Pt electrodes as the counter electrode (CE) in DSSCs. Cobalt sulfide-doped graphene nanocomposites were synthesized via a direct sol-gel approach as a low-cost substitute for Pt. Characterization using X-ray diffraction, scanning electron microscopy/energy-dispersive/transmission electron microscopy, and UV-Vis spectroscopy shows the successful formation of Cobalt sulfide-doped graphene nanocomposites. The band gap energy of Cobalt sulfide-doped graphene is 3.05 eV, which is lower than rGO (3.252 eV), due to enhanced light absorption in the visible range imparted by rGO. The open circuit voltage is 0.75 V, the short circuit current density is 17.88 mA/cm2, and the fill factor is 0.527. Under the illumination of AM 1.5 simulated solar light (100 mW cm−2), the DSSC based on the proposed CoS/rGO CE achieved an efficiency of 7.0759 %.
Keywords
Counter electrode; Pt-free; Photo-anode; DSSC; Photovoltaic performance; Graphene; Drop casting


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