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Mitigating cerium migration for perfluorosulfonic acid membranes using organic ligands

Journal Article · · Journal of Power Sources
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [4];  [5];  [5];  [6];  [6];  [7];  [7];  [7];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Delaware, Newark, DE (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Rensselaer Polytechnic Inst., Troy, NY (United States)
  5. Univ. of Texas, Austin, TX (United States)
  6. Univ. of Delaware, Newark, DE (United States)
  7. Chemours Company, Newark, DE (United States)
+ Show Author Affiliations
Improving the electrochemical stability of proton exchange membranes is a pressing priority for heavy-duty fuel cell vehicles. The lifetime of the most widely used perfluorosulfonic acid membranes is limited by reactive free radicals generated inside the system. Cerium has been found to reduce the chemical degradation of the membranes. However, cerium migration during fuel cell operation limits the chemical durability enhancement effect expected from the radical scavenging activity of cerium. Here we investigate a wide range of organic immobilizers for cerium, measuring their suitability concerning cerium retention, radical scavenging activity, and fuel cell performance. Further, we report that partially fluorinated phosphonic acids enhance cerium retention up to 45 times and reduce fluoride emission rate by 38% compared to the commercial Nafion™ XL membrane pre-impregnated with cerium. The energetics of cerium-phosphonic acid complex systems by density functional theory calculations rationalizes effective cerium immobilization.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office
Grant/Contract Number:
89233218CNA000001; AC02-05CH11231; AR0001003
OSTI ID:
1906034
Alternate ID(s):
OSTI ID: 2426773
Report Number(s):
LA-UR--22-28539; LA-UR--22-32498
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 554; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Mitigating cerium migration for perfluorosulfonic acid membranes using organic ligands
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Related Subjects

25 ENERGY STORAGE
cerium migration
chemical stability
durability
energy sciences
perfluorosulfonic acid
proton exchange membrane fuel cell
radical scavenger