High Surface Area Electrocatalysts for Photoelectrolysis

We propose to demonstrate the feasibility of using transition metal carbides as a substitute for platinum photoelectrolysis catalysts. Our particular interest is in replacing platinum used in the hydrogen reduction electrode. We will adapt proprietary, patent pending processes to deposit catalytically active transition metal carbides on GaInP2 test coupons provided by the National Renewable Energy Laboratory. These test coupons will be evaluated for catalytic activity and electrocatalytic stability in aqueous sulfuric or phosphoric acid electrolyte. While this proposal will focus on catalysts for tandem cells, these materials will also enable other electrolytic systems as well. These materials are designed to address the lifetime limitations of present photoelectrolytic catalyst deposition will be integrated with the other fabrication steps for tandem cells.