Solid Polymer Electrolyte Water Electrolysis

Solid Polymer Electrolyte Water Electrolysis (SPEWE) is considered to be a promising method because it can operate at high current densities due to the extreme volume reduction compared with the KOH electrolyte, and low cell alloys. It is based on the use of a proton conducting membrame of the sulfonic acid type, Nafion, with a tenth of a millimetre thickness, which acts both as an acid and as a separating wall. In these membrane electrolyzers, only clean water is used. SPEWE has the advantages of cell compactness, simpliyity in design and operation, lack of corrosion. A considerable handicap, however, is represented by the high cost of the membrane production and the need of noble metal primary electrodes.

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