Hydrothermal synthesis of novel CeO2/g-C3N4 nanocomposite: dual function of highly efficient supercapacitor electrode and Pt-free counter electrode for dye synthesized solar cell applications

Abstract

Here, we show how to make highly nitrogen-containing graphite carbon (g-C₃N₄)-coated rare earth metal oxide of CeO₂ nanotubes (CeO₂/g-C₃N₄), which is usable as a dual function of supercapacitor electrode and counter electrode for dye-sensitized solar cells (DSSCs). Transmission electron microscopy (TEM), field emission scanning electron spectroscopy (FESEM), and energy-dispersive X-ray spectroscopy (EDX) techniques have all been used to examine the surface morphology and chemical data of the catalyst. The CeO₂/g-C₃N₄-composited electrode exhibits high-specific capacitance of 614 Fg⁻¹ at 2 Ag⁻¹. Based on the Trassati method, the CeO₂/g-C₃N₄ electrode exhibits 92% capacitive behavior at 100 mVs⁻¹. The CeO₂/g-C₃N₄ electrode exhibits 91.6% cyclic stability after 10,000 cycles. The DSSCs made with CeO₂/g-C₃N₄ exhibited outstanding catalytic activity and a PCE of 8.13% compared to 8.02% for a standard electrode made of Pt. Due to the composite material’s outstanding catalytic performance and good electrical conductivity, this has occurred. However, the electrical conductivity of the titanium mesh is high. And compared to an FTO substrate, it can enhance the region of contact between the electrode material and the substrate. It can enhance I⁻/I⁻³’s capacity to speed up electron transmission by diffusion.