Method for Study of Organic Electrochemistry: Electrochemical Measurements of Organic Molecules - Fundamentals and Applications of Organic Electrochemistry - page 50

but in general the electrode surface is polished
with alumina abrasive or emery papers.
Reference electrodes are required when
measurement of current potential curves and
constant potential electrolysis are carried out.
When aqueous and protic solvents are used as
electrolytic solvents, a SCE ( Figure 2.2a ) and a
silver-silver chloride (Ag/AgCl) electrode
( Figure 2.2b ) should be used. For electrolysis in
non-aqueous solution, an Ag/Ag + reference
electrode is convenient since it can be placed
near the working electrode surface without a
salt bridge. Reference electrodes are described
in further detail in Chapter 2 .
3.5 Electrolytic Solvents and
Supporting Electrolytes
Electrolytic solvents must have polarity, which
allows supporting electrolytes to be dissolved to
dissociate ions and provide sufficient ion
conductivity for the electrolytic solutions. The
index of solvent polarity is reflected by its
dielectric constant, and electrolytic solvents
should have low viscosity and toxicity. In
particular, it should be noted that solvent
viscosity strongly affects diffusion of substrate
from bulk to electrode surface.