Abstract
Carbon felts manufactured by (Co)CNF were subjected to heat treatment under different temperatures to use for the electrode of a redox-flow battery. BET and weight loss were tested to investigate the physical properties of the carbon felt according to the heat treatment conditions. SEM and XPS were also analyzed to characterize their surface area. In addition, electrical resistance, CV (cyclic voltammetry) and RFB charge on the electrode properties were examined in accordance with the heat treatment conditions with the discharge performance. The changes of physical properties on the carbon felt surface was confirmed via SEM and BET analysis, The most addition of oxygen functional groups on the carbon felt surface was obtained when one hour heat treatment at and it was confirmed by XPS analysis. After resulting the CV tests, the active area of the electrode was the largest at heat treatment. The heat treatment experiment of vanadium redox flow battery using the carbon felts were tested at , and . As a result, the charge-discharge energy efficiency of the heat treatment electrode was 72.9% and 79.8%, at and , respectively. The efficiency of the heat treatment electrode at was the best as 79.8% at .
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