Journal article
Optimizing Sputtered Iridium Electrocatalysts for Acidic Oxygen Evolution Using Design of Experiments
Journal of physical chemistry. C, Vol.129(41), pp.18391-18405
10/16/2025
DOI: 10.1021/acs.jpcc.5c03764
Abstract
Iridium is considered the most effective electrocatalyst for the oxygen evolution reaction (OER) in acidic media. Often, iridium is mixed with cocatalysts or support materials to boost the OER performance and reduce the cost of water electrolyzers. To synthesize efficient iridium electrocatalysts, many studies vary either one or more fabrication parameters at a time without evaluating the potential interactions between them, which could improve the electrocatalysts’ overall performance. In this study, we examine the combined effects of iridium thickness, titanium adhesion layer thickness, annealing temperature, and annealing time on the performance of sputtered iridium electrocatalysts in sulfuric acid (H2SO4) through a factorial design of experiments (DoE). The DoE response analysis of our electrochemical data through the main, interaction, and standardized effects plots, with added experimental optimization of results, enabled the identification of a sputtered titanium-supported iridium electrocatalyst that operated continuously for 48 h in 1 M H2SO4 at 1.61 V vs RHE for a 10 mA/cm2 current density. Our study shows how statistical analysis through factorial DoE can be used as a tool to improve the activity and stability of OER electrocatalysts in acidic media.
Details
- Title: Subtitle
- Optimizing Sputtered Iridium Electrocatalysts for Acidic Oxygen Evolution Using Design of Experiments
- Creators
- Joshua Adedeji Bolarin - University of MichiganGyan Prakash Sharma - University of MichiganChayanika Das - University of MichiganSyed Mubeen - University of IowaNirala Singh - University of Michigan
- Resource Type
- Journal article
- Publication Details
- Journal of physical chemistry. C, Vol.129(41), pp.18391-18405
- DOI
- 10.1021/acs.jpcc.5c03764
- ISSN
- 1932-7447
- eISSN
- 1932-7455
- Publisher
- AMER CHEMICAL SOC
- Grant note
- SunHydrogenUniversity of Michigan College of Engineering
This work was financially supported by SunHydrogen. This work was performed in part at the University of Michigan Lurie Nanofabrication Facility, particularly using the sputter deposition tool. We acknowledge the University of Michigan College of Engineering for financial support and the Michigan Center for Materials Characterization for use of the instruments and staff assistance for characterization of samples.
- Language
- English
- Electronic publication date
- 10/06/2025
- Date published
- 10/16/2025
- Academic Unit
- Civil and Environmental Engineering; Chemical and Biochemical Engineering
- Record Identifier
- 9985014871002771
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