Efficiency Studies of Galinsoga Parviflora Pigments as a Sensitizer in Pt Free Graphene Oxide/Nickel Oxide Counter Elect
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ORIGINAL PAPER
Efficiency Studies of Galinsoga Parviflora Pigments as a Sensitizer in Pt Free Graphene Oxide/Nickel Oxide Counter Electrode: Dye Sensitized Solar Cell Applications T. Shanmugapriya1 • J. Balavijayalakshmi1 Received: 22 March 2020 / Accepted: 9 August 2020 Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract An easily available Galinsoga Parviflora (GP) natural dye has been used as natural sensitizers for dye sensitized solar cell (DSSC). Graphene oxide (GO) is one of the most efficient materials for solar cells, supercapacitor and sensing applications because of its unique properties. It is prepared from natural graphite flakes by modified Hummer’s method. Graphene oxide/nickel oxide (GO/NiO) nanocomposites are prepared by chemical precipitation method. The different concentrations of nickel oxide nanoparticles (5:1, 5:2 and 5:3) are embellished on the GO surface. The synthesis of these nanocomposites are confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM). The XRD results confirmed that the nickel oxide nanoparticles are coated on the graphene oxide surface and the crystallite size of GO/NiO (5:1, 5:2 and 5:3) nanocomposites are found to be around 19 nm, 21.3 nm and 23 nm respectively. The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry (CV) technique. The power conversion efficiency is measured using a light source simulated with an intensity of 100 mW/cm2. The conversion efficiency of prepared sandwich type dye sensitized solar cell (5:1, 5:2 and 5:3) is 0.9%, 1.3% and 1.65% respectively. Keywords Graphene Nickel oxide Galinsoga Parviflora (GP) Conversion efficiency
Introduction The ever increasing demand for energy requires the rapid action to utilize the renewable energy sources effectively [1]. A dye-sensitized solar cell is a low-cost solar cell that belongs to the group of thin film solar cells. It works even in low-light conditions such as non-direct sunlight and cloudy sky. The working principle of dye sensitized solar cell is based on the photo generation of an electron by a dye as in photosynthesis and the dyes play a vital role in increasing the efficiency of solar cell [2]. Among the
& J. Balavijayalakshmi [email protected] T. Shanmugapriya [email protected] 1
Department of Physics, PSGR Krishnammal College for Women, Coimbatore, Tamilnadu, India
various solar cells, (natural) dye sensitized solar cell is an attempt to reproduce nature’s photosynthesis process. The increase in the power efficiency makes the devices more cost competitive compared to traditional sources of energy [3, 4]. Graphene possess high surface area, good electron transport capabilities, strong mechanical strength and excellent thermal and electrical cond
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