Determination of hydrogen sulfide in gasoline by Au nanoclusters modified glassy carbon electrode

A promising hydrogen sulfide (H2S) sensor was prepared by electrodeposition of Au nanoclusters on glassy carbon electrode (GCE) and the surface structure was characterized by SEM and EDAX. These flower-like form Au nanoclusters, which were made up of highly dense clustering Au nanorods with an average diameter of 20 nm and length up to 80 nm, had an average size about 600 nm and uniformly distributed on the GCE surface. The electrocatalytic oxidation of H2S in gasoline was performed on this modified electrode, which had a satisfactory liner response to H2S in the range of 1-80 ppm and a detection limit of 0.45 ppm (s/n = 3). This sensor was sensitive, selective and stable. (C) 2009 Published by Elsevier B.V.