Effect of Base on the Facile Hydrothermal Preparation of Highly Active IrOx 
Oxygen Evolution Catalysts

Esquius, Jonathan Ruiz; Morgan, David J.; Spanos, Ioannis; Hewes, Daniel G.; Freakley, Simon J.; Hutchings, Graham J.

doi:10.1021/acsaem.9b01642

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Effect of Base on the Facile Hydrothermal Preparation of Highly Active IrOx Oxygen Evolution Catalysts

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Spanos, Ioannis
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Esquius, J. R., Morgan, D. J., Spanos, I., Hewes, D. G., Freakley, S. J., & Hutchings, G. J. (2020). Effect of Base on the Facile Hydrothermal Preparation of Highly Active IrOx Oxygen Evolution Catalysts. ACS Applied Energy Materials, 3(1), 800-809. doi:10.1021/acsaem.9b01642.

Cite as: https://hdl.handle.net/21.11116/0000-0007-851B-5

Abstract

The efficient electrochemical splitting of water is limited by the anodic oxygen evolution reaction (OER). IrO2 is a potential catalyst with sufficient activity and stability in acidic conditions to be applied in water electrolyzers. The redox properties and structural flexibility of amorphous iridium oxohydroxide compared to crystalline rutile-IrO2 are associated with higher catalytic activity for the OER We prepared IrOx OER catalysts by a simple hydrothermal method varying the alkali metal base (Li2CO3, LiOH, Na2CO3, NaOH, K2CO3, KOH) employed during the synthesis. This work reveals that the surface area, particle morphology, and the concentration of surface hydroxyl groups can be controlled by the base used and greatly influence the catalyst activity and stability for OER. It was found that materials prepared with bases containing lithium cations can lead to amorphous IrOx materials with a significantly lower overpotential (100 mV @a 1.5 mA.cm(-2) ) and increased stability compared to materials prepared with other bases and rutile IrO2. This facile method leads to the synthesis of highly active and stable catalysts which can potentially be applied to larger scale catalyst preparations.