Core-Shell Rhodium Sulfide Catalyst for HER/HOR in HBr Solution

Synthesis and characterization of high electrochemical surface area core-shell RhxSy catalysts for HER/HOR in HBr solution are discussed. Catalysts with RhxSy as shell and different percentage (5%, 10%, and 20%) platinum on carbon as core material are synthesized. Cyclic voltammetry was used to evaluate the Pt- equivalent mass specific ECSA and durability of these catalysts. The results show that the catalyst with core-shell structure has better performance compared to commercial catalyst (RhxSy/C catalyst from BASF). XRD, XPS and TEM were used to characterize the bulk and surface compositions and to confirm the core-shell structure of the catalysts, respectively.