Enhanced Oxygen Reduction Activity of IrCu Core Platinum Monolayer Shell Nano-electrocatalysts
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Designing novel cathode materials for a proton exchange membrane fuel cell with high activity for the oxygen reduction reaction, low Pt loading, and enhanced long-term stability is imperative for its sustainability. To date, Pt monolayer based electrocatalysts deposited on a metallic core substrate have shown promising possibilities. In this study, we synthesized bimetallic IrCu nanoparticles and used them as a core for Pt monolayer electrocatalysts. It was found that the de-alloyed IrCu nanoparticle surfaces increased both the mass and specific activities of the resulting Pt monolayer catalyst. In addition, we demonstrated that Pt monolayer electrocatalysts with a de-alloyed IrCu core have a better stability than those using a non-dealloyed core based on a 5,000 potential cycling test. These data describe a new simple synthesis of a high-performance catalyst suitable for practical applications.
KeywordsFuel cells Electrocatalysis Core–shell catalyst Pt monolayer Cu underpotential deposition Oxygen reduction
This research was performed at Brookhaven National laboratory under contract DE-AC02-98CH10886 with the US Department of Energy, Division of Chemical Sciences, Geosciences and Biosciences Division. This work was conducted under the framework of Research and Development Program of the Korea Institute of Energy Research (KIER) (B3-2415). Y.C. truly acknowledges the kind support by Drs. Hicham Idriss and Essam H. Jamea to carry out this project in Brookhaven National Laboratory. Also, Y.C. thanks Dr. Toseef N. Ahmed and Hugh Issacs and Wei-Fu Chen for SEM/EDX measurements and fruitful discussion on electrochemistry, respectively.
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