Some Aspects of the Thermodynamics of the Platinum Hydrogen Electrode

The presence of adsorbed hydrogen results in essential differences in the thermodynamics of the surface phenomena on the platinum electrode compared to the mercury one. Thus in this case the point of zero charge (in the conventional sense) does not coincide with the maximum of the electro‐capillary curve. The value of the potential difference between the electrode and the solution depends not only on the surface charge but also on the amount of adsorbed hydrogen. Additional complications arise in the presence of specifically adsorbed cations and anions in the solution. The experimental data used in this paper have been obtained by the charging curves method, by direct determinations of anion and cation adsorption, and by the measurements of the potential shift with changing composition of the solution under isoelectric conditions.