2023

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Browsing 2023 by Author "MADARAQA AFTAB"

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    Synthesis and Characterization of Chromium doped SnO2 at Reduced Graphene Oxide Nanocomposite and its Electrochemical Measurements
    (UMT, Lhr, 2023) MADARAQA AFTAB
    In this study, chromium doped tin oxide loaded on reduced graphene oxide nanocomposites were synthesized via a co-precipitation approach. Pure and Cr (2, 4, 6, 8 and 10%) doped SnO2 nanoparticles were also prepared through similar method. Optical, structural and morphological characteristics of samples were carried out by FE-SEM, XRD, UV–Visible characterizations. The morphology observed through SEM, 8% Cr-SnO2 at RGO is in form of nanorods. XRD studies confirmed the diffracted peaks were rutile structure of SnO2 phase. Study was conducted in various electrolytes but best result was found in KOH. The electrochemical behavior of the sample was determined using Cyclic Voltammetry (CV) by scanning the potential at a rate of 50 mV s‾¹ and for a maximum current of 750 mA carried out on all samples. It was observed that as the weight percentage of Cr in Cr doped SnO2 increases, the electrochemical performance increases as compared to pure SnO2. The sample showed both oxidation and reduction peaks. A larger peak current of 8mA and oxidation potential of 0.69V was observed for 8 weight percent Cr doped SnO2. It also exhibited the highest areal capacitance of 401 F/g at a scan speed of 50 mV s−1, which is higher than that of the pure SnO2 (246.5 F/g). More electrolyte was mobilized at 8% Cr-SnO2 surface rather than 10% Cr-SnO2 surface. 8% Cr doped SnO at RGO showed peak current at 16 mA and oxidation potential was 0.7V. It also showed enhanced conductivity between graphene sheets, thus improving the charge transfer and specific capacitance (830 F/g). The electrochemical behavior of the sample was further determined using Electron Impedance Spectroscopy by applying direct voltage of 0.7V, 8% Cr doped SnO2 at RGO showed a closed curve in high frequency area indicating stability and more impedance compared to other samples.