5. Electrolysis membranes
5.1 General
Since the early 1970s, a new type of separator has been used in electrolysis: the membrane.
Unlike the diaphragm, which is porous, the membrane is, in principle, permeable only to those ions that its structure is designed to transfer. It is an ion-selective membrane. For example, for the electrolysis of NaCl solutions, fluorinated polymers grafted with sulfonic or carboxylic end groups are used, which confer cation exchange and transport properties (so-called "cationic" membranes) (see figure ).
The Na + ion thus moves across the membrane under the effect of the electric field, as shown in figure .
The membrane must...
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Electrolysis membranes
Electrodes
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