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

Abstract

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.

Authors:
ORCiD logo [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)
OSTI Identifier:
1497734
Alternate Identifier(s):
OSTI ID: 1503811
Report Number(s):
NREL/JA-5900-73185
Journal ID: ISSN 0013-4651
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 166; Journal Issue: 4; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; electrocatalysis; electrolysis; iridium; oxygen evolution

Citation Formats

Alia, Shaun M., and Anderson, Grace C. Iridium Oxygen Evolution Activity and Durability Baselines in Rotating Disk Electrode Half-Cells. United States: N. p., 2019. Web. doi:10.1149/2.0731904jes.
Alia, Shaun M., & Anderson, Grace C. Iridium Oxygen Evolution Activity and Durability Baselines in Rotating Disk Electrode Half-Cells. United States. doi:10.1149/2.0731904jes.
Alia, Shaun M., and Anderson, Grace C. Sat . "Iridium Oxygen Evolution Activity and Durability Baselines in Rotating Disk Electrode Half-Cells". United States. doi:10.1149/2.0731904jes.
@article{osti_1497734,
title = {Iridium Oxygen Evolution Activity and Durability Baselines in Rotating Disk Electrode Half-Cells},
author = {Alia, Shaun M. and Anderson, Grace C.},
abstractNote = {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.},
doi = {10.1149/2.0731904jes},
journal = {Journal of the Electrochemical Society},
number = 4,
volume = 166,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1149/2.0731904jes

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Works referenced in this record:

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