Platinum Monolayer Fuel Cell Electrocatalysts

Journal Article · Sat Dec 01 04:00:00 UTC 2007 · Topics in Catalysis, 46(3-4):249-262

DOI:https://doi.org/10.1007/s11244-007-9003-x· OSTI ID:959213

Adzic, Radoslav R; Zhang, Junliang; Sasaki, Kotaro; Vukmirovic, Miomir B; Shao, M; Wang, J X; Nilekar, Anand U; Mavrikakis, Emmanouil; Valerio, J A; Uribe, F

The research described in this product was performed in part in the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. We describe a new class of electrocatalysts for the O₂ reduction, and H₂ and methanol oxidation reactions, consisting of a monolayer of Pt deposited on a metal or alloy carbon-supported nanoparticles. These electrocatalysts show up to a 20-fold increase in Pt mass activity compared with conventional all-Pt electrocatalysts. The origin of their increased activity was identified through a combination of experimental methods, employing electrochemical and surface science techniques, X-ray absorption spectroscopy, and density functional theory calculations. The long-term tests in fuel cells demonstrated excellent stability of the anode and good stability of the cathode electrocatalysts. We also describe the stabilization of Pt electrocatalysts against dissolution under potential cycling regimes effected by a submonolayer of Au clusters deposited on Pt surfaces. These new electrocatalysts promise to alleviate some of the major problems of existing fuel cell technology.

• 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: 959213
• Journal Information: Topics in Catalysis, 46(3-4):249-262, Journal Name: Topics in Catalysis, 46(3-4):249-262
• Country of Publication: United States
• Language: English

Related Subjects

Environmental Molecular Sciences Laboratory