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SPE systems. In one an electrode is pressed
onto only one side of the surface of the
ion-exchange membrane and in the other two
electrodes are pressed on both surfaces. Figure
6.1 illustrates the latter SPE system. Substrate
AH 2 is oxidized at the anode and the resulting
protons migrate through the cation exchange
membrane to the cathode. Thus, ionic
conductivity, namely proton conductivity, is
available. The arriving protons are reduced at
the cathode to generate hydrogen gas solely in
the absence of substrate ( Figure 6.1a ), while
substrate B is reduced to BH 2 in the presence of
substrate B ( Figure 6.1b ). In the latter case, two
products, A and BH 2 , are obtained from two
starting substrates, AH 2 and B, respectively,
therefore this electrolysis can be considered to
be a kind of paired electrosynthesis.
Figure 6.1 Principle of electrolysis using an
SPE system with platinum electrodes
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