Iron-chromium redox flow cells

In iron-chromium redox flow cells, carbon materials are commonly used as the (inert) electrodes (carbon fiber cloth, felt, etc.). Johnson and Reid (1985) suggested depositing traces of lead and gold (p,g/cm ) on the carbon material of the electrode in the chromium redox system (the chromium electrode ) in order to accelerate the electrode reaction. The solution for the positive half-cell usually contains a certain concentration of hydrochloric acid (HCl) in addition to FeCls and FeCl2. 

Iron-Chromium Redox Flow Fuel Cells... 

Many investigations into iron-chromium redox flow fuel cells were carried out by a research group in Alicante University, Spain. At a temperature of 44 C with... 

Redox flow batteries, under development since the early 1970s, are stUl of interest primarily for utility load leveling applications (77). Such a battery is shown schematically in Figure 5. Unlike other batteries, the active materials are not contained within the battery itself but are stored in separate tanks. The reactants each flow into a half-ceU separated one from the other by a selective membrane. An oxidation and reduction electrochemical reaction occurs in each half-ceU to generate current. Examples of this technology include the iron—chromium, Fe—Cr, battery (79) and the vanadium redox cell (80). 

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