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3 c further detail). In short, true RFBs utilise inert electrodes and redox species that remain in solution. Examples of classical true RFBs are the iron-chromium [30], bromine-polysulphide [31] and the VRFB [32]. A schematic of the VRFB is shown in Figure 4. The operation of a hybrid RFB involves a phase change during the cell reaction. An example is the zinc-bromine system in which the plating and dissolution of zinc at the anode occurs upon charge and discharge respectively [33]. Fig 4. A schematic diagram of the all-vanadium RFB in discharge mode. The efficiency of a RFB can be characterised by several parameters. Firstly, the coulombic efficiency CE which is the ratio of the current transferred upon discharge to the current transferred upon charge. (9) With Qout the amount of charge during discharge and Qin the amount of charge during charge. Low values indicate a crossover of active species between electrode compartments causing self-discharge, or side reactions that consume charge. Another parameter is the voltage efficiency VE, defined as the ratio of the average discharging voltage to the average charging voltage. Page 11 of 63PDF Image | Redox Flow Batteries Concepts Chemistries
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