Chemistry Reference
In-Depth Information
commercially available disk diameters range
from 1 μm to 1 cm. Metal plate electrodes are
usually connected to a lead wire by spot
welding, and the wire part is encapsulated in a
non-conducting sheath of glass or inert
polymeric material ( Figure 2.1c ).
Figure 2.1 Examples of handmade working
electrodes
Ideally, a working electrode should behave in
the same way each time it is used. The factors
that affect the electrochemical behaviour of a
surface are its cleanliness, the kind and extent
of chemical functionalities (including oxides)
that are present, and the microstructure of the
electrode material itself. Generally, a
pre-treatment step or steps will be carried out
prior to each experiment to ensure that the
electrode surface condition can be reproduced
from experiment to experiment. These steps
may be as simple as mechanical polishing, and
may include pre-scanning across a certain
potential range or exposure to a solvent or
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