Electro-oxidation of Hydrogen with Carbon Monoxide on Pt/Ru-Based Ternary Catalysts

Abstract

Five carbon-supported Pt/Ru-based catalysts (Pt/Ru, Pt/Ru/Os, Pt/Ru/Au, and were studied for electro-oxidation of and with 1% CO at the anode of a proton exchange membrane fuel cell. For oxidation, the performance of the Pt/Ru anode was not affected by addition of W, Os, and Au. However, the catalyst was found to result in a very poor performance for oxidation. For electro-oxidation of with 1% CO, the catalyst was the most active catalyst and the Pt/Ru/Au catalyst was the poorest. was almost twice as active as the Pt/Ru catalyst at practical potentials. A new intermediate mechanism was proposed to explain the CO tolerance of Pt/Ru-based catalysts. © 2003 The Electrochemical Society. All rights reserved.