Palladium-based electrocatalysts for hydrogen oxidation and oxygen reduction reactions

▶ Recent progress of palladium-based materials including extended surfaces and nanostructured ones for hydrogen oxidation reaction and oxygen reduction reaction was overviewed. ▶ Pd-Pt alloys show comparable to or higher hydrogen oxidation activity than pure Pt. ▶ Pd alloys show comparable oxygen reduction activity to pure Pt. ▶ Oxygen reduction activity depends strongly on the orientations of the Pd surface. ▶ Durability of Pd alloys is an issue in fuel cell operation.