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Title: Durability of Pt-Co Alloy Polymer Electrolyte Fuel Cell Cathode Catalysts under Accelerated Stress Tests

Abstract

The durability of Pt-Co alloy cathode catalysts supported on high surface area carbon is investigated by subjecting them to accelerated stress tests (ASTs). The catalysts had different initial Co contents and nanoparticle morphologies: a “spongy” porous morphology for the high-Co (H) content catalyst, and a fully alloyed crystalline morphology for the medium-Co (M) and low-Co (L) content catalysts. The specific activity of the catalysts depends on their initial Co content, morphology and nanoparticle size, and remained higher than 1000 μA/cm 2-Pt after 27–50% Co loss. The H-catalyst electrode showed the smallest kinetic overpotentials (η c s) due to higher initial Pt loading than the other two electrodes, but it had the fastest increase in ηcs with AST cycling due to lower Co retention; the L-catalyst electrode showed higher η c s due to a lower initial Pt loading, but had a smaller increase in η c s with aging due to higher Co retention; the M-catalyst electrode showed a similar increase in η c s with aging, but this increase was due to the combined effects of Co dissolution and electrochemically active surface area (ECSA) loss. In conclusion, the modeled increase in mass transfer overpotentials with aging correlates with themore » initial Pt loading, ECSA loss and the initial catalyst morphology« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2];  [2];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); 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); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Hydrogen and Fuel Cell Technologies Program (EE-3F)
Contributing Org.:
General Motors (GM), Detroit, MI (United States); EWII Fuel Cells LLC, Albuquerque, NM (United States); Umicore N.V., Brussels (Belgium)
OSTI Identifier:
1437379
Alternate Identifier(s):
OSTI ID: 1441342; OSTI ID: 1454750; OSTI ID: 1460217
Report Number(s):
LA-UR-18-20373; NREL/JA-5900-71738
Journal ID: ISSN 0013-4651; 141131
Grant/Contract Number:  
AC02-06CH11357; AC52-06NA25396; AC36-08GO28308; AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 6; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Catalyst durability; PEM fuel cells; PtCo-alloy catalyst; Energy Sciences; Fuel Cell, Durability, AST, accelerated stress test, PtCo; 30 DIRECT ENERGY CONVERSION; catalyst durability; 36 MATERIALS SCIENCE

Citation Formats

Papadias, D. D., Ahluwalia, R. K., Kariuki, N., Myers, D., More, K. L., Cullen, David A., Sneed, B. T., Neyerlin, K. C., Mukundan, R., and Borup, Rod L. Durability of Pt-Co Alloy Polymer Electrolyte Fuel Cell Cathode Catalysts under Accelerated Stress Tests. United States: N. p., 2018. Web. doi:10.1149/2.0171806jes.
Papadias, D. D., Ahluwalia, R. K., Kariuki, N., Myers, D., More, K. L., Cullen, David A., Sneed, B. T., Neyerlin, K. C., Mukundan, R., & Borup, Rod L. Durability of Pt-Co Alloy Polymer Electrolyte Fuel Cell Cathode Catalysts under Accelerated Stress Tests. United States. doi:10.1149/2.0171806jes.
Papadias, D. D., Ahluwalia, R. K., Kariuki, N., Myers, D., More, K. L., Cullen, David A., Sneed, B. T., Neyerlin, K. C., Mukundan, R., and Borup, Rod L. Sat . "Durability of Pt-Co Alloy Polymer Electrolyte Fuel Cell Cathode Catalysts under Accelerated Stress Tests". United States. doi:10.1149/2.0171806jes. https://www.osti.gov/servlets/purl/1437379.
@article{osti_1437379,
title = {Durability of Pt-Co Alloy Polymer Electrolyte Fuel Cell Cathode Catalysts under Accelerated Stress Tests},
author = {Papadias, D. D. and Ahluwalia, R. K. and Kariuki, N. and Myers, D. and More, K. L. and Cullen, David A. and Sneed, B. T. and Neyerlin, K. C. and Mukundan, R. and Borup, Rod L.},
abstractNote = {The durability of Pt-Co alloy cathode catalysts supported on high surface area carbon is investigated by subjecting them to accelerated stress tests (ASTs). The catalysts had different initial Co contents and nanoparticle morphologies: a “spongy” porous morphology for the high-Co (H) content catalyst, and a fully alloyed crystalline morphology for the medium-Co (M) and low-Co (L) content catalysts. The specific activity of the catalysts depends on their initial Co content, morphology and nanoparticle size, and remained higher than 1000 μA/cm2-Pt after 27–50% Co loss. The H-catalyst electrode showed the smallest kinetic overpotentials (ηcs) due to higher initial Pt loading than the other two electrodes, but it had the fastest increase in ηcs with AST cycling due to lower Co retention; the L-catalyst electrode showed higher ηcs due to a lower initial Pt loading, but had a smaller increase in ηcs with aging due to higher Co retention; the M-catalyst electrode showed a similar increase in ηcs with aging, but this increase was due to the combined effects of Co dissolution and electrochemically active surface area (ECSA) loss. In conclusion, the modeled increase in mass transfer overpotentials with aging correlates with the initial Pt loading, ECSA loss and the initial catalyst morphology},
doi = {10.1149/2.0171806jes},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 6,
volume = 165,
place = {United States},
year = {2018},
month = {3}
}

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