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This content will become publicly available on August 24, 2018

Title: Effect of Cerium, Cobalt and Nickel Contaminants on the Oxygen Reduction Reaction at Platinum Electrodes

State of the art proton exchange membrane fuel cells contain metallic cations as alloyed Pt catalysts or as additives to improve the chemical stability of membranes. While these novel materials have improved the performance and durability, they can leach out contaminants such as Ce, Ni and Co ions into the ionomer, impact the potency of the additive, decrease the ionomer conductivity and reduce fuel cell performance. We report here that in presence of Ce, Ni and Co, the ionomer conductivity (Nafion 211) decreases by a factor of ~3 with 5.2-19.2 mg metal cm -3 at 80°C, 100% RH. As a result, this performance correlates with a decrease in ORR performance, most notably lower limiting currents 1.1x10 -1 mA cm -2 in proton form vs. 6.2-8.2x10 -2 mA cm 2 with 6-12 mgmetal cm -3 and lower ORR onset potentials at 25°C, 100% RH.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Report Number(s):
LA-UR-17-25970
Journal ID: ISSN 1938-6737
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
ECS Transactions (Online)
Additional Journal Information:
Journal Name: ECS Transactions (Online); Journal Volume: 80; Journal Issue: 8; Journal ID: ISSN 1938-6737
Publisher:
Electrochemical Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Energy Sciences
OSTI Identifier:
1415415