Hydrogen evolution reaction at indium electrode in molten ethylammonium tetrafluoroborate

The hydrogen evolution reaction (HER) has been studied at indium electrode in pure molten ethylammonium tetrafluoroborate (EtNH3BF4). Measurements wer e carried out from 424 to 474 K. The a.c, impedance and potentiostatic pola rization techniques were used. The exchange current density of the HER, its overall apparent activation energy, tile cathodic transfer coefficient and the double layer capacitance have been determined. It has been postulated that the amine molecules do not adsorb on the indium electrode surface in t he potential range applied and do not inhibit the HER.