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

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.

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

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.

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