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Title: Activity and Durability of Iridium Nanoparticles in the Oxygen Evolution Reaction

Abstract

Unsupported iridium (Ir) nanoparticles, that serve as standard oxygen evolution reaction (OER) catalysts in acidic electrolyzers, were investigated for electrochemical performance and durability in rotating disk electrode (RDE) half-cells. Fixed potential holds and potential cycling were applied to probe the durability of Ir nanoparticles, and performance losses were found to be driven by particle growth (coarsening) at moderate potential (1.4 to 1.6 V) and Ir dissolution at higher potential (>/=1.8 V). Several different commercially available samples were evaluated and standardized conditions for performance comparison are reported. In conclusion, the electrocatalyst RDE results have also been compared to results obtained for performance and durability in electrolysis cells.

Authors:
 [1];  [2];  [3];  [1];  [1];  [3];  [2];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Science Center
  2. Giner, Inc., Newton, MA (United States)
  3. Colorado School of Mines, Golden, CO (United States). Dept. of Chemistry
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1290782
Report Number(s):
NREL/JA-5900-66915
Journal ID: ISSN 0013-4651
Grant/Contract Number:
AC36-08GO28308; SC0007471
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 163; Journal Issue: 11; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electrocatalysis; electrolysis; iridium

Citation Formats

Alia, Shaun M., Rasimick, Brian, Ngo, Chilan, Neyerlin, K. C., Kocha, Shyam S., Pylypenko, Svitlana, Xu, Hui, and Pivovar, Bryan S. Activity and Durability of Iridium Nanoparticles in the Oxygen Evolution Reaction. United States: N. p., 2016. Web. doi:10.1149/2.0151611jes.
Alia, Shaun M., Rasimick, Brian, Ngo, Chilan, Neyerlin, K. C., Kocha, Shyam S., Pylypenko, Svitlana, Xu, Hui, & Pivovar, Bryan S. Activity and Durability of Iridium Nanoparticles in the Oxygen Evolution Reaction. United States. doi:10.1149/2.0151611jes.
Alia, Shaun M., Rasimick, Brian, Ngo, Chilan, Neyerlin, K. C., Kocha, Shyam S., Pylypenko, Svitlana, Xu, Hui, and Pivovar, Bryan S. Fri . "Activity and Durability of Iridium Nanoparticles in the Oxygen Evolution Reaction". United States. doi:10.1149/2.0151611jes. https://www.osti.gov/servlets/purl/1290782.
@article{osti_1290782,
title = {Activity and Durability of Iridium Nanoparticles in the Oxygen Evolution Reaction},
author = {Alia, Shaun M. and Rasimick, Brian and Ngo, Chilan and Neyerlin, K. C. and Kocha, Shyam S. and Pylypenko, Svitlana and Xu, Hui and Pivovar, Bryan S.},
abstractNote = {Unsupported iridium (Ir) nanoparticles, that serve as standard oxygen evolution reaction (OER) catalysts in acidic electrolyzers, were investigated for electrochemical performance and durability in rotating disk electrode (RDE) half-cells. Fixed potential holds and potential cycling were applied to probe the durability of Ir nanoparticles, and performance losses were found to be driven by particle growth (coarsening) at moderate potential (1.4 to 1.6 V) and Ir dissolution at higher potential (>/=1.8 V). Several different commercially available samples were evaluated and standardized conditions for performance comparison are reported. In conclusion, the electrocatalyst RDE results have also been compared to results obtained for performance and durability in electrolysis cells.},
doi = {10.1149/2.0151611jes},
journal = {Journal of the Electrochemical Society},
number = 11,
volume = 163,
place = {United States},
year = {Fri Jul 15 00:00:00 EDT 2016},
month = {Fri Jul 15 00:00:00 EDT 2016}
}

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  • Optimizing the utilization of Pt to catalyze the sluggish kinetics of the oxygen reduction reaction (ORR) is of vital importance in proton exchange membrane fuel cells. One of the strategies is to spread Pt atoms over the surface of a substrate to increase the surface area. We report a facile method to synthesize Pd6CoCu@Pt/C core-shell nanoparticles with an ultralow amount of Pt. It was found that Pt-coated layer on Pd6CoCu cores plays a vital role in enhancing the ORR activity and the cycling stability. The half-wave potential of Pd6CoCu@Pt/C positively shifts about 50 mV and 17 mV relative to Pd6CoCu/Cmore » and Pt/C, respectively. The Pt mass activity on Pd6CoCu@Pt/C was calculated to be about 27 times higher than that on Pt/C catalysts at 0.9 V. Furthermore, the Pd6CoCu@Pt/C nanoparticles exhibit superior stability with almost no decay for the ORR polarization curves during 10,000 potential cycles and the core-shell structure remains with only a slight increase in the thickness of the Pt overlayer. Our findings provide a methodology for synthesizing highly efficient catalytic materials for the cathodic application in fuel cells.« less
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