Heterostructured Au–Ir Catalysts for Enhanced Oxygen Evolution Reaction

Electrochemical water splitting operated under acidic conditions provides a clean approach to generate hydrogen fuels. Currently, the sluggish kinetics of oxygen evolution reaction (OER) at anode is bottleneck limiting splitting. Here, we report that OER activity Ir, one most commonly used catalysts, can be boosted by forming phase boundaries with Au. Mixed Au and Ir catalysts were synthesized on carbon paper electrodes, which underwent structural environment form an Au–Ir interface-rich structure. Compared catalyst, requires overpotential ?393 mV achieve current density 10 mA/cm2 in 0.1 M HClO4 electrolyte, evolved catalyst shows lower ?351 mV. X-ray photoelectronic spectrum (XPS) study, conjunction electrochemical analysis surface-site-normalized activity, reveals improved performance due presence Au/Ir interfaces catalysts. In addition strategy accelerating via has been further applied IrCo, IrNi, IrCu alloy With broad applicability demonstrated, this study opens new route design for efficient