Stabilization of Platinum Nanoparticle Electrocatalysts for Oxygen Reduction Using Poly(diallyldimethylammonium chloride)
A long-chain polyelectrolyte, poly(diallyldimethylammonium chloride) (PDDA), has been employed to stabilize platinum nanoparticles for oxygen reduction in polymer electrolyte membrane (PEM) fuel cells. Pt nanoparticles were synthesized by reducing H2PtCl6 with NaBH4 in the presence of PDDA and then deposited on carbon support (PDDA-Pt/C). Transmission electron microscope images showed that Pt nanoparticles of PDDA-Pt/C are uniformly dispersed on carbon support with a mean size of about 2.2 nm (2.1 nm for commercial Etek-Pt/C). PDDA-Pt/C exhibited a higher activity towards oxygen reduction reaction (ORR) than Etek-Pt/C. The durability of PDDA-Pt/C was improved by a factor of 2 as compared with Etek-Pt/C. X-ray photoelectron spectroscopy characterization of PDDA-Pt/C revealed the interaction between Pt nanoparticles and PDDA, which increased Pt oxidation potential. PDDA-Nafion ionic crosslinking "entraps" Pt nanoparticles and prevents Pt nanoparticles from migrating/agglomerating on or detaching from carbon support. This provides a promising strategy to improve both the durability and activity of electrocatalysts for fuel cells.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 970367
- Report Number(s):
- PNNL-SA-67934; 30506
- Journal Information:
- Journal of Materials Chemistry, 19(42):7995 - 8001, Journal Name: Journal of Materials Chemistry, 19(42):7995 - 8001 Journal Issue: 42 Vol. 19; ISSN JMACEP; ISSN 0959-9428
- Country of Publication:
- United States
- Language:
- English
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Noncovalently functionalized graphitic mesoporous carbon as a stable support of Pt nanoparticles for oxygen reduction
Noncovalently functionalized graphitic mesoporous carbon as a stable support of Pt nanoparticles for oxygen reduction
Related Subjects
CARBON
ELECTROCATALYSTS
ELECTROLYTES
ELECTRON MICROSCOPES
Environmental Molecular Sciences Laboratory
FUEL CELLS
MEMBRANES
OXIDATION
OXYGEN
Oxygen reduction
PEM fuel cells
PLATINUM
POLYMERS
Poly(diallyldimethylammonium chloride) (PDDA). http://www.rsc.org/delivery/_ArticleLinking/ArticleLinking.cfm?JournalCode=JM&Year=2009&ManuscriptID=b912104h&Iss=42
Pt nanoparticles
STABILIZATION
Stabilization
X-RAY PHOTOELECTRON SPECTROSCOPY