Medical Design Briefs - June 2021 - 15

investigate a single electrode and
thus a single event (see Figure 1).
The current flows through the
anode (electrode where oxidation
happens) and the cathode (electrode
where reduction takes place). So, both
these electrodes influence the measured
current and the current-limiting process
cannot be determined. This is especially
an issue in analytical chemistry. Another
issue is concentration polarization. This
is the effect of an electrode changing its
environment and thus its potential during
an electrochemical reaction. For
most electroanalytical methods, a poten+
-
Rf
a)
WE
E
I
RE
RE
CE
CE
CE
b)
WE
E
I
c)
WE
Vout
-
Vbias
+
Fig
1 - Current and potential in a two-electrode system (a) and in a three-electrode system (b), and the
schematic of a potentiostat control circuit (c).
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Medical Design Briefs - June 2021

Table of Contents for the Digital Edition of Medical Design Briefs - June 2021

Medical Design Briefs - June 2021 - Intro
Medical Design Briefs - June 2021 - Cov4
Medical Design Briefs - June 2021 - Cov1a
Medical Design Briefs - June 2021 - Cov1b
Medical Design Briefs - June 2021 - Cov1
Medical Design Briefs - June 2021 - Cov2
Medical Design Briefs - June 2021 - 1
Medical Design Briefs - June 2021 - 2
Medical Design Briefs - June 2021 - 3
Medical Design Briefs - June 2021 - 4
Medical Design Briefs - June 2021 - 5
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Medical Design Briefs - June 2021 - Cov3
Medical Design Briefs - June 2021 - CovIV
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