Abstract
Amorphous iridium oxides (IrOx) are highly active for oxygen evolution reaction (OER) in acid media; however, it is generally unstable compared with commercial IrO2. Recently, many non-noble metal-iridium mixed oxides are prepared for catalyzing OER efficiently. Herein, we report a cubic fluorite-type praseodymium iridium oxide with the surface of IrOx (IrOx/Pr3IrO7) that shows the improved activity and stability in 0.1 mol L−1 HClO4 solution, characterized by an overpotential of 305 mV at the benchmark of 10 mA cm−2 and a small Tafel slope of 37 mV dec−1, indicating a fast reaction kinetics and a competitive activity compared with the benchmark IrO2 and most reported electrocatalysts. The initial potential increases by less than 0.07 V after continuous OER testing over 60,000 s. In contrast, IrO2 becomes nearly inactive for the OER within 20,000 s. Density functional theory calculations uncover that the optimal energy level path follows lattice oxygen mechanism (LOM). This work enlarges the family of the IrOx-type OER electrocatalyst in acid media.
Paper version not known (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
