Journal
APPLIED SURFACE SCIENCE
Volume 647, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2023.158960
Keywords
Oxygen evolution reaction; Iridium oxide; Ceria; Lower valence state; Electrochemical water splitting
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A composite catalyst of IrOx nanoparticles dispersed in CeO2 support (IrOx/CeO2) was prepared for oxygen evolution reaction (OER), showing excellent performance and stability. The lower-valance Ir3+ species near the catalyst surface served as active sites for OER.
In this study, a composite catalyst consisting of IrOx nanoparticles dispersed in CeO2 support (IrOx/CeO2) was prepared for oxygen evolution reaction (OER) using a simple polyol method. The oxygen transfer from IrOx to oxygen defects in CeO2 induced a high ratio of lower-valence Ir3+ species, which are known to be an active phase for OER. The prepared IrOx/CeO2 catalyst exhibited excellent OER performance with a small overpotential of 263.4 mV at 10 mA/cm2, and good stability for 10 h under acidic condition, outperforming IrOx/C and com-mercial IrO2 catalysts. The lower-valence Ir3+ species near the catalyst surface functioned as possible active site ensembles, promoting the chemical and electrochemical steps during OER process and improving the OER ac-tivity. Additionally, the metal-support interaction between IrOx and CeO2 enhanced the durability of the catalyst.
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