DYNAMIC HYDROGEN ELECTRODE

"A pseudo-reference electrode assembly, simulating a reversible hydrogen electrode with an approximately 20 to 40 mV more negative potential. While its potential is less defined, it has the advantage of not requiring a hydrogen gas supply. It is typically a glass tube containing two internal electrodes, at least one of which is a platinized platinum electrode, immersed in the same electrolyte solution as is the electrolyte in the working cell, with the two electrolytes in ionic contact through a separator. A small, constant current is enforced between the two electrodes with the platinized platinum being the cathode, carrying typically 1 mA/cm2 current density, resulting in a small amount of hydrogen evolution. This cathode is then used as the reference electrode. "