Single-Phase Pyrochlore Y2Ir2O7 Electrocatalyst on the Activity of Oxygen Evolution Reaction

Single-phase pyrochlore-type Y2Ir2O7 electrocatalyst was made through the sol gel synthesis. This catalyst has high activity and stability toward oxygen evolution reaction (OER) in acid. Chronopotentiometry analysis shows no major changes in overpotential for more than 24 h measurement at 10 mA/cm(geo)(2). Transmission electron microscopy shows no formation of a new shell layer after the OER tests. X-ray absorption spectroscopy (XAS) was used to examine the single-electron filling in the e '' orbital of Ir 5d states, which could contribute to the improved OER activity.