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Title: Iridium Oxygen Evolution Activity and Durability Baselines in Rotating Disk Electrode Half-Cells

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0731904jes· OSTI ID:1497734

This paper evaluates iridium (Ir) and Ir oxide nanoparticles for baseline oxygen evolution performance and durability in rotating disk electrode (RDE) half-cells. These efforts address a literature gap, developing best practices for RDE testing by focusing on ink preparation and test protocols that affect measured activities. While Ir nanoparticles produce double the mass activity of Ir oxide in half-cells, the benefit is not observed in single-cells due to near-surface oxidation during conditioning. Ir oxide nanoparticle durability, however, is improved in both RDE and membrane electrode assemblies (MEAs) due to slower dissolution kinetics. Establishing separate Ir and Ir oxide baselines are critical since RDE may overestimate Ir performance and underestimate Ir durability when compared to Ir oxide in MEAs. While half-cells may be a reasonable gauge for oxygen evolution performance, the technique is limited in approximating long-term durability since dissolution dominates loss at electrolysis-relevant potentials.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office (HFTO)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1497734
Alternate ID(s):
OSTI ID: 1503811
Report Number(s):
NREL/JA-5900-73185; /jes/166/4/F282.atom
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Vol. 166 Journal Issue: 4; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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