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3.6.1 “In-operando” reference electrode Figure 3.10. –Scheme of a) a filter press cell and b) the proposed reference electrode. The reference electrode consisted of a silver wire, two pieces of ion-exchange membrane and two pieces of Teflon tape (Figure 3.10b). The silver wire was sandwiched between two rectangular pieces of membrane. Some drops of 3 M sulfuric acid were added to ensure good wettability. The stack formed by membrane/Ag wire/membrane was again sandwiched between two pieces of Teflon tape. Teflon is highly hydrophobic and, thus, it acted as physical barrier and maintained our reference electrode separated from the solution. The bottom of the membrane was not covered by the Teflon to allow ionic contact between the Ag wire and the solution. In absence of the membrane pieces, the Ag wire remains ionically insulated from the solution. The Teflon pieces are employed to prevent any possible diffusion of Ag2SO4 through the thin membrane (50 mm of thickness). The 54PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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