ChemInform Abstract: KATHODISCHES VERHALTEN VON KONZENTRIERTER SCHWEFELSAEURE

Abstract

Das kathodische Verhalten von 85‐100%iger Schwefelsäure in Abhängigkeit von Kathodenmaterial, von der Temperatur und von der Wasserkonzentration wird untersucht.

A thermodynamic rationalisation for the oxidising behaviour of concentrated H2SO4

“…However, the increase is discontinuous, since three distinct zones, based on the slope (d E /d log i ), are identified. These observations are consistent with three major potential‐dependent reduction processes, which involve the formation of SO 2 , S, or H 2 S (Garrera et al, 1968; Beck, 1972; Bilal and Tributsch, 1998).…”

“…The oxidising capability of concentrated aqueous solutions of sulfuric acid (H 2 SO 4 ) is well documented in reported studies on the corrosion of metals and alloys (Evans and Hart, 1961; Kremko et al, 1985; El Zeky et al, 1987; Kish et al, 2004) and on its electrolysis (Garrera et al, 1968; Beck, 1972; Bilal and Tributsch, 1998). Cathodic reduction involves the formation of sulfur dioxide (SO 2 ) at low overpotentials, elemental sulfur (S) at intermediate overpotentials, and hydrogen sulfide (H 2 S) at high overpotentials.…”