Tetrahidrofuran ve Dimetil Sülfoksitin Vanadyum Redoks Bataryadaki Pozitif Elektrolit Üzerine Olan Etkilerinin Araştırılması

Year 2018, Volume: 22 Issue: 3, 1114 - 1120, 20.09.2018

Metin Gençten

https://doi.org/10.19113/sdufenbed.433125

Cited By: 2

Abstract

Bu
çalışmada, tetrahidrofuran ve dimetil sülfoksitin vanadyum redoks bataryanın
pozitif elektrolitinin elektrokimyasal davranışına olan etkilerinin
karşılaştırılmalı bir çalışması yapılmıştır. Bu kapsamda, katkı maddesi, V(IV)
ve sülfürik asit içeren elektrolit çözeltilerinin karakterizasyonu için dönüşümlü
voltametri ve elektrokimyasal empedands spektroskopisi kullanılmıştır. Piklerin
akım ve kapasiteleri voltamogramlardan elde edilmiştir. Redoks reaksiyonu
tetrahidrofuran içeren pozitif elektrolit çözeltisinde difüzyonken ile
kontrollü gerçekleşmişken, dimetil sulfoksit içeren çözeltide
difüzyon+adsorbsiyon ile kontrollü olarak gerçekleşmiştir. Elektrokimyasal
impedimetrik analizlerde ise direnç değerleri incelenmiştir. Voltametrik
analizlerde kullanılan kalem ucu grafit elektrotun yüzey karakterizasyonu taramalı
elektron mikroskobu analizleri ile yapılmıştır.

Keywords

Dönüşümlü voltametri, Elektrokimyasal empedans spektroskopisi, Tetrahidrofuran, Dimetilsulfoksit

Investigation the Effects of Tetrahydrofuran and Dimethyl Sulfoxide on the Positive Electrolyte of Vanadium Redox Battery

Abstract

In
this work, a comparative study was done to determine the effects of
tetrahydrofuran and dimethyl sulfoxide on the electrochemical behaviors of a
vanadium redox flow battery’s (VRFB’s) positive electrolyte. In this concept,
cyclic voltammetry and electrochemical impedance spectroscopy were used for the
characterization of electrolytes consisting of additives, V(IV) and sulfuric
acid. Currents and capacities of peaks were determined in cyclic voltammograms.
The redox reaction were controlled by diffusion and diffusion+adsorption in
tetrahydrofuran and dimethyl sulfoxide including positive electrolyte solutions
of VRFB, respectively. Resistance values were investigated in electrochemical
impedimetric analysis. The morphological characterization of the pencil
graphite electrodes used in cyclic voltammetric analysis, were done by scanning
electron microscopic analysis.

Keywords

Cyclic voltammetry, Electrochemical impedance spectroscopy, Tetrahydrofuran, Dimethyl sulfoxide

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