Cu–Rh alloys have been electrodepos

Cu–Rh alloys have been electrodeposited, for the first time, from sulfate solutions at pH 3.4. Cyclic voltammetry showed that Rh was deposited at a more negative potential than Cu, although it is more noble. Alloys with a wide range of compositions were obtained, with high current efficiency. XRD analyses suggested the formation of polycrystalline metastable CuxRh1−x solid solutions, also in the range where a solubility gap is known to exist (0.1≤x≤0.8). Cu–Rh alloys were more active than individual metals in nitrate reduction. Maximum activity was observed with a 30 Rh at.% alloy. Analyses of the reaction products are in progress.