Abstract
Numerous inorganic and organic counter electrodes (CEs) have been fabricated for dye-sensitized solar cells (DSSCs) instead of platinum (Pt) CE. However, MoS 2 and carbon nanocomposite have played an important role in CEs due to their superior electrochemical properties and high chemical stability. N-doped graphene quantum dot (N-GQD) @ MoS 2 @ reduced graphene oxide (rGO) nanocomposite was synthesized by the two-step hydrothermal method. The morphology of as-synthesized nanocomposites was studied using field emission scanning electron microscope (FE-SEM) and scanning transmission electron microscopy (STEM). It confirms the formation of sphere-like MoS 2 composed of nanosheets on the surface of rGO sheets. The N-GQD@MoS 2 @rGO composites confirmed the presence of MoS 2 , rGO, and N-GQD by X-ray diffraction (XRD) and Raman spectra. The chemical composition and purity of N-GQD@MoS 2 @rGO was examined by the X-ray photoelectron spectroscopy analysis technique. The electrochemical property of the as-fabricated CEs was studied by cyclic voltammetry (CV) analysis by using the iodine-based electrolyte. The N-GQD@MoS 2 @rGO shows the superior catalytic property due to more electrochemical active site and electrical conductivity property of rGO and MoS 2 . The DSSCs device assembled with as-fabricated CEs and their photovoltaic power conversion efficiency (η) of MoS 2 was 2.01%, MoS 2 @rGO was 3.92%, N-GQD@MoS 2 was 3.53%, N-GQD@MoS 2 @rGO was 4.65%, and Pt was 5.17%. schematic diagram of DSSCs fabrication with N-GQD@MoS 2 @rGO CEs.
Published Version
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