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Title: Editors' Choice—Electrochemically Active Surface Area Measurement of Aged Pt Alloy Catalysts in PEM Fuel Cells by CO Stripping

Abstract

The use of hydrogen adsorption/desorption (HAD) is a convenient method to measure the Pt surface area of a catalyst. However, it was shown that electrochemical charges measured by this technique can underestimate the Pt surface area by up to a factor of two for small Pt nanoparticles or Pt alloy nanoparticles. Electrooxidation of CO, so-called CO stripping, has been shown to be more accurate. Yet measurements of CO stripping in MEAs are scarce, especially on high activity alloy catalysts. In this study we investigated CO stripping and the ratio between Pt surface areas measured by CO and by HAD on several Pt and Pt alloy catalysts. The effects on these measurements of temperature and catalyst aging by voltage cycling are discussed.

Authors:
 [1];  [2];  [2];  [2]
  1. General Motors Global Product Development, Pontiac, MI (United States); Univ. of South Carolina, Columbia, SC (United States)
  2. General Motors Global Product Development, Pontiac, MI (United States)
Publication Date:
Research Org.:
General Motors, Inc., Pontiac, MI (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office
OSTI Identifier:
1425404
Grant/Contract Number:  
EE0007271
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 2; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Garrick, Taylor R., Moylan, Thomas E., Carpenter, Michael K., and Kongkanand, Anusorn. Editors' Choice—Electrochemically Active Surface Area Measurement of Aged Pt Alloy Catalysts in PEM Fuel Cells by CO Stripping. United States: N. p., 2016. Web. doi:10.1149/2.0381702jes.
Garrick, Taylor R., Moylan, Thomas E., Carpenter, Michael K., & Kongkanand, Anusorn. Editors' Choice—Electrochemically Active Surface Area Measurement of Aged Pt Alloy Catalysts in PEM Fuel Cells by CO Stripping. United States. https://doi.org/10.1149/2.0381702jes
Garrick, Taylor R., Moylan, Thomas E., Carpenter, Michael K., and Kongkanand, Anusorn. Tue . "Editors' Choice—Electrochemically Active Surface Area Measurement of Aged Pt Alloy Catalysts in PEM Fuel Cells by CO Stripping". United States. https://doi.org/10.1149/2.0381702jes. https://www.osti.gov/servlets/purl/1425404.
@article{osti_1425404,
title = {Editors' Choice—Electrochemically Active Surface Area Measurement of Aged Pt Alloy Catalysts in PEM Fuel Cells by CO Stripping},
author = {Garrick, Taylor R. and Moylan, Thomas E. and Carpenter, Michael K. and Kongkanand, Anusorn},
abstractNote = {The use of hydrogen adsorption/desorption (HAD) is a convenient method to measure the Pt surface area of a catalyst. However, it was shown that electrochemical charges measured by this technique can underestimate the Pt surface area by up to a factor of two for small Pt nanoparticles or Pt alloy nanoparticles. Electrooxidation of CO, so-called CO stripping, has been shown to be more accurate. Yet measurements of CO stripping in MEAs are scarce, especially on high activity alloy catalysts. In this study we investigated CO stripping and the ratio between Pt surface areas measured by CO and by HAD on several Pt and Pt alloy catalysts. The effects on these measurements of temperature and catalyst aging by voltage cycling are discussed.},
doi = {10.1149/2.0381702jes},
journal = {Journal of the Electrochemical Society},
number = 2,
volume = 164,
place = {United States},
year = {Tue Dec 13 00:00:00 EST 2016},
month = {Tue Dec 13 00:00:00 EST 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 57 works
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Figures / Tables:

Figure 1 Figure 1: Cyclic voltammograms of an MEA showing electrooxidation of adsorbed CO with two different H2 concentrations in the anode flow. Cathode Pt loading was 0.05 mg/cm2. Membrane thickness was 18 μm.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.