Recent Advances in Pt Monolayer Electrocatalysts for Oxygen Reduction Reaction: Scale-up Synthesis, Structure, and Activity of Pt Shells on Pd Cores

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Electrochimica Acta

DOI:https://doi.org/10.1016/j.electacta.2009.11.106· OSTI ID:989151

Sasaki, K. ^[1]; Wang, J. X. ^[1]; Naohara, H. ^[2]; Marinkovic, N. ^[3]; More, Karren Leslie ^[4]; Inada, H. ^[5]; Adzic, R. R. ^[1]

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1. Brookhaven National Laboratory (BNL)
2. Toyota Motor Corp.
3. University of Delaware
4. ORNL
5. Hitachi High Technologies America

We have established a scale-up synthesis method to produce gram-quantities of Pt monolayer electrocatalysts. The core-shell structure of the Pt/Pd/C electrocatalyst has been verified using the HAADF-STEM Z-contrast images, STEM/EELS, and STEM/EDS line profile analysis. The atomic structure of this electrocatalyst and formation of a Pt monolayer on Pd nanoparticle surfaces were examined using in situ EXAFS. The Pt mass activity of the Pt/Pd/C electrocatalyst for ORR is considerably higher than that of commercial Pt/C electrocatalysts. The results with Pt monolayer electrocatalysts may significantly impact science of electrocatalysis and fuel-cell technology, as they have demonstrated an exceptionally effective way of using Pt that can resolve problems of other approaches, including electrocatalysts inadequate activity and high Pt content.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 989151
• Journal Information: Electrochimica Acta, Vol. 55, Issue 8; ISSN 0013-4686
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
ELECTROCATALYSTS
FUEL CELLS
OXYGEN
PLATINUM
SYNTHESIS