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Cathode materials for electrolysis of hydrochloric acid

Nawrat G., Parla A., Nieużyła Ł., Simka W.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 3

41-44

The paper presents the results of investigations on silver cathodes with coatings obtained by means of thermal method to be used in the electrolysis of hydrochloric acid. Active coatings based on precious metals including platinum have good corrosion resistance and low overpotential of hydrogen owing to thermal decomposition of the respective salts on a silver substrate covered with a sublayer of gold. The values of hydrogen overpotential in 22% hydrochloric acid at 70°C amount to 70 mV at the current density of j = 1 kA/m2.