Clark electrode

A schematic representation of Clark's 1962 invention, the oxygen electrode

The Clark electrode is an electrode that measures ambient oxygen partial pressure in a liquid using a catalytic platinum surface according to the net reaction:

O2 + 4 e− + 4 H+ → 2 H2O

It improves upon a bare platinum electrode by using a semipermeable membrane to reduce fouling and metal plating onto the platinum.

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