On the impedance of galvanic cells: X. The impedance of the H⊕/H2(Hg) electrode in 1 M perchloric acid

From impedance measurements it is shown that the hydrogen ion reduction on mercury behaves as a case of pure activation polarization between -1.1 and -1.3 V vs S.C.E. with 1-α = 0.56 and ksh = 10−15 cm · sec−1. The value of the double layer capacity in that potential range is reported. No influence of hydrogen on the double layer capacity could be observed.