Fluoroalkyl phosphonic acid radical scavengers for proton exchange membrane fuel cells
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- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Delaware, Newark, DE (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Vietnam National University, Ho Chi Minh City (Viet Nam)
- Pusan National Univ., Busan (Korea, Republic of)
- Univ. of Delaware, Newark, DE (United States)
- The Chemours Company FC, LLC, Wilmington, DE (United States)
Radical-induced degradation of proton exchange membranes limits the durability of proton-exchange membrane fuel cells. Cerium is widely used as a radical scavenger, but the migration of cerium ions to the catalyst layer has been an unresolved issue, reducing its effectiveness over time. Here, we report phosphonic acids as a promising class of radical scavengers, showing competent radical scavenging activity compared to cerium without the migration issue. The ex situ Fenton test shows that the fluoride emission rate for Nafion membrane incorporated with fluoroalkyl phosphonic acid ranged from 0.22 to 0.37 μg F cm–2 h–1, lower than that of the cerium-incorporated Nafion™ membrane (0.39 μg F cm–2 h–1). The in situ open circuit voltage hold test confirmed that a phosphonic acid-incorporated Nafion™ membrane has a 58% lower fluoride emission rate compared to the baseline. Density functional theory calculations indicate that the activation energy of the hydroxyl radical scavenging reaction of an alkyl phosphonic acid is only 0.68 eV, suggesting an effective radical scavenging pathway.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- 89233218CNA000001; M2FCT consortium
- OSTI ID:
- 1970404
- Alternate ID(s):
- OSTI ID: 1972136; OSTI ID: 2204202
- Report Number(s):
- LA-UR-23-23774; LA-UR-23-23030
- Journal Information:
- Journal of Materials Chemistry. A, Vol. 11, Issue 18; ISSN 2050-7488
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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