Ordered bilayer ruthenium–platinum core-shell nanoparticles as carbon monoxide-tolerant fuel cell catalysts

Yu-Chi Hsieh, Yu Zhang, Dong Su, Vyacheslav Volkov, Rui Si, Lijun Wu, Yimei Zhu, Wei An, Ping Liu, Ping He, Siyu Ye, Radoslav R. Adzic and Jia X Wang ()
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Yu-Chi Hsieh: Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA
Yu Zhang: Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA
Dong Su: Center for Functional Nanomaterials, Brookhaven National Laboratory
Vyacheslav Volkov: Brookhaven National Laboratory
Rui Si: Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA
Lijun Wu: Brookhaven National Laboratory
Yimei Zhu: Brookhaven National Laboratory
Wei An: Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA
Ping Liu: Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA
Ping He: Ballard Power Systems
Siyu Ye: Ballard Power Systems
Radoslav R. Adzic: Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA
Jia X Wang: Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: Abstract Fabricating subnanometre-thick core-shell nanocatalysts is effective for obtaining high surface area of an active metal with tunable properties. The key to fully realize the potential of this approach is a reliable synthesis method to produce atomically ordered core-shell nanoparticles. Here we report new insights on eliminating lattice defects in core-shell syntheses and opportunities opened for achieving superior catalytic performance. Ordered structural transition from ruthenium hcp to platinum fcc stacking sequence at the core-shell interface is achieved via a green synthesis method, and is verified by X-ray diffraction and electron microscopic techniques coupled with density functional theory calculations. The single crystalline Ru cores with well-defined Pt bilayer shells resolve the dilemma in using a dissolution-prone metal, such as ruthenium, for alleviating the deactivating effect of carbon monoxide, opening the door for commercialization of low-temperature fuel cells that can use inexpensive reformates (H2 with CO impurity) as the fuel.

Date: 2013
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DOI: 10.1038/ncomms3466

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