Abstract
Rhodium sulfide on carbon support (denoted as Rh2S3/C) was synthesized by refluxing of rhodium chloride (RhCl3) with ammonium thiosulfate. By thermal treatment in Ar, Rh2S3 can be transformed into different phases, such as Rh17S15, Rh3S4 and Rh, which were evident from XRD analysis. The particle size distribution of catalysts with the range from 3 to 12 nm (average 6 nm) was observed by transmission electron microscopy (TEM). The activity in terms of exchange current density (i 0) for hydrogen oxidation (HOR) and hydrogen evaluation (HER) reaction in H2-saturated 1M hydrobromic acid (HBr) solution was obtained from the slope of Butler-Volmer plots.
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