Collect. Czech. Chem. Commun. 2011, 76, 929-936
Published online 2011-06-30 13:27:19

Voltammetry of aqueous chloroauric acid with hanging mercury drop electrode

Andrey V. Korshunova, Bogdan Yosypchukb and Michael Heyrovskýb,*

a Tomsk Polytechnic University, Department of General and Inorganic Chemistry, Lenin Avenue 30, 634050 Tomsk, Russian Federation
b J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic


In d.c. voltammetry of dilute aqueous chloroauric acid with hanging mercury drop electrode, when potential scanning proceeds from negative to positive values, a prominent maximum of cathodic current appears on the curve near 0 V. The effect is explained as due to catalytic evolution of hydrogen on the electrode initially covered by adsorbed Au-hydroxidic layer. Once the layer dissolves in the acidic solution during the positive scan, a fast evolution of hydrogen takes place, catalysed by short-lived adsorbed gold particles.

Keywords: Aqueous chloroauric acid; Hanging mercury drop electrode; Linear voltammetry; Catalytic hydrogen evolution; Voltammetry; Gold; Hydrogen.

References: 13 live references.