1LL-8 : Electrochemically Fabricated Rhodium Phosphide Cathode for Water Splitting in Acidic Medium

Water electrolysis for hydrogen production is promising technology that can be feasible as eco-friendly system when connecting with renewable energy. Whereas the platinum-group metals (PGMs) is the most active material to hydrogen evolution reaction (HER), their problems as scarcity and high cost hinder commercial use as cathode. In this work, in order to reduce the amount of PGMs, introduction of non-metal to PGMs material has been conducted using electrochemical deposition method. Rh and P have been used as PGMs and non-metal precursor, respectively, and the Rh-P catalyst was fabricated by controlling the deposition condition. The electrochemical properties of Rh-P catalyst have been investigated in acidic medium. It was confirmed that the P introduction into Rh neutralize the hydrogen adsorption energy indicating facilitate the HER. Furthermore, compared to Pt, the mass activity of Rh-based catalyst has been exhibited the higher value.