Chem
ArticleDissolution-Induced Surface Roughening and Oxygen Evolution Electrocatalysis of Alkaline-Earth Iridates in Acid
The Bigger Picture
Ir-based oxides are well-known materials used as electrocatalysts for the oxygen evolution reaction (OER). Despite notable catalytic properties, the scarceness and subsequent high cost of Ir are serious disadvantages for actual applications ranging to fuel cells and electrolyzers. To reduce the amount of Ir used per unit mass of a catalyst and to boost the OER activity and stability under acidic conditions, many different types of Ir oxides mixed with other elements have recently been suggested. With a combination of direct atomic-level observations and chemical analyses, this work shows that enormous surface roughening can be induced by alkaline-earth leaching in AIrO3-type iridates (A = Sr and Ba) during the OER in acid, thus making a major contribution to the continuous growth of the OER activity overall without serious degradation.
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These authors contributed equally
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Present address: Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 02792, Korea
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