Fundamental Principles of Organic Electrochemistry: Fundamental Aspects of Electrochemistry Dealing with Organic Molecules - Fundamentals and Applications of Organic Electrochemistry - page 7

Figure 2.2 Examples of handmade reference
electrodes
The reference electrodes used in non-aqueous
systems can be classified into two types. One
type is an aqueous reference electrode, usually
an aqueous Ag/AgCl electrode or SCE.
However, the aqueous reference electrode
should not be dipped directly into the
non-aqueous solution under study because the
solution is contaminated with water and the
electrolyte (usually KCl). To prevent this, the
reference electrode should be in a separate
compartment and a salt bridge used for the
ion-conducting connection between the
working electrode and reference electrode
compartments (see Figure 2.3c ). The tip of the
salt bridge, which is filled with the non-aqueous
electrolytes under study, is dipped into the
non-aqueous solution. When such aqueous
reference electrodes are used, the liquid
junction potential between the aqueous and
non-aqueous solutions must be taken into