The voltammetry of some oxidising and reducing toxic gases direct from the gas phase, at gold and platinum metallised-membrane electrodes in acid and alkali

Abstract

Metallised-membrane electrodes of gold and platinum in acid and alkali have been used for cyclic-voltammetry studies of chlorine, nitrogen monoxide and dioxide, sulphur dioxide and hydrogen sulphide. Nitrogen dioxide-reduction plateau currents were increased in acid and decreased in alkali. The oxidation waves of nitrogen dioxide suggested a catalytic conversion to the monoxide on the oxidised electrode surfaces, prior to electron transfer. The results suggest a number of ways in which the electrodes could be developed for use in toxic-gas monitors.