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Chapter 2. Redox Flow Batteries 2.3 Battery Components A full RFB system consists of many parts and components, but it is outside the scope of this work to describe them all. Instead, only the components relevant for the presented work will be described in the following. All cell cycling and electrochemical impedance experiments presented later in the thesis were carried out using a single cell RFB, meaning that a cell stack consisting of one sequence of negative electrode, membrane, and positive electrode was used. An exploded-view schematic of the cell used for the experimental work is presented in Figure 2.6. Electrode Membrane Electrolyte outlet Electrolyte inlet End plate Current collector Graphite flow plate Gasket Electrical insulation Figure 2.6: Exploded-view schematic of the 5cm2 geometric area cell from Fuel Cell Technologies used in this work. 2.3.1 Electrolytes A variety of electrolyte systems were introduced in the previous section. Here, several of the important parameters are introduced instead. The three parameters that decide the charge capacity of an electrolyte are the concentration c (which should ideally be as close as possible to the solubility limit), electrolyte volume V , and number of electrons n exchanged in the half-cell reaction. The capacity Q is then calculated according to Faraday’s law: Q = cV nF (2.7) where F is the Faraday constant. The total energy (J, or more commonly W h) is the product of the capacity and the cell voltage. While pairing electrolytes, it is therefore important to choose two pairs that have a large separation in redox potentials to achieve higher cell voltages. The allowable 16PDF Image | Organic Redox Flow Batteries 2023
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