Electrochemical Evaluation of Liquid Electrolyte for Dye-Sensitized Solar Cells (DSSCs) by Cyclic Voltammetry

سال انتشار: 1394
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 365

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شناسه ملی سند علمی:

ELECTROCHEMISTRY011_163

تاریخ نمایه سازی: 5 بهمن 1395

چکیده مقاله:

While Prof Grätzel invented dye-sensitized solar cells (DSSCs) in 1991, the research on different parts of this photovoltaic device for increasing efficiency has attracted great attention [1].Electrolyte is one of key component for DSSCs and its properties have much effect on the conversion efficiency and stability of the solar cells [2]. Several studies have used cyclic voltammetry technique in order to explain the effect of electrochemical properties of electrolyteon the performance of DSSCs [3-5]. So the aim of this work is studying reduction mechanism of I3 - at Pt electrode by cyclic voltammetry. Method Cyclic voltammograms for the electrolyte were recorded in three-electrode electrochemical cell containing a Pt-electrode as the working electrode, Pt- wire as counter and an Ag/AgCl as areference electrode dipped in acetonitrile solution containing 1 mM I2, 10 mM KI and 0.1 MNaNO3 at different scan rates, using an electrochemical workstation (PGSTAT. 302N, Autolab, Eco-Chemie, The Netherlands).Result and Discussion Fig.1. (a) shows the cyclic voltammograms of electrolytes in different scan rates and Fig. (b) Shows the relationship between redox peak and scan rate. Linear relationship between peak currents and square roots of scan rates indicates the redox reaction of / on the surface of Ptelectrode is a diffusion-limited reaction, which may be related to the transport of iodine species from Pt surface to electrolyte solution. These results suggest that there is no specific interaction between / - redox couple and Pt counter electrode. ConclusionThe electrochemical evaluation of DSSCs liquid electrolyte showed the reduction of on the Pt electrode was limited by diffusion of species from electrode to electrolyte solution. Therefore, additions of chemical compounds which accelerate the diffusion of can enhance theperformance of DSSCs

کلیدواژه ها:

Dye Sensitized Solar Cells ، Cyclic Voltammetry ، Electrolyte ، Diffusion

نویسندگان

Malihe Khalili

Institute of Chemical Technology, Iranian Research Organization for Science and Technology, Tehran, Iran.

Mohammad Abedi

Institute of Chemical Technology, Iranian Research Organization for Science and Technology, Tehran, Iran.

Seyed Ahmad Mozaffari

Institute of Chemical Technology, Iranian Research Organization for Science and Technology, Tehran, Iran.