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Palladium and Gold Nanotubes as Oxygen Reduction Reaction and Alcohol Oxidation Reaction Catalysts in Base

Authors

  • Shaun M. Alia,

    1. Department of Chemical Engineering, University of Delaware, Newark, DE 19716 (USA), Fax: (+1) 302-831-1048
    2. Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521 (USA)
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  • Kathlynne Duong,

    1. Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521 (USA)
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  • Toby Liu,

    1. Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521 (USA)
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  • Kurt Jensen,

    1. Department of Chemical Engineering, University of Delaware, Newark, DE 19716 (USA), Fax: (+1) 302-831-1048
    2. Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521 (USA)
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  • Prof. Yushan Yan

    Corresponding author
    1. Department of Chemical Engineering, University of Delaware, Newark, DE 19716 (USA), Fax: (+1) 302-831-1048
    2. Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521 (USA)
    • Department of Chemical Engineering, University of Delaware, Newark, DE 19716 (USA), Fax: (+1) 302-831-1048===

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Abstract

Palladium (PdNTs) and gold nanotubes (AuNTs) were synthesized by the galvanic displacement of silver nanowires. PdNTs and AuNTs have wall thicknesses of 6 nm, outer diameters of 60 nm, and lengths of 5–10 and 5–20 μm, respectively. Rotating disk electrode experiments showed that the PdNTs and AuNTs have higher area normalized activities for the oxygen reduction reaction (ORR) than conventional nanoparticle catalysts. The PdNTs produced an ORR area activity that was 3.4, 2.2, and 3.7 times greater than that on carbon-supported palladium nanoparticles (Pd/C), bulk polycrystalline palladium, and carbon-supported platinum nanoparticles (Pt/C), respectively. The AuNTs produced an ORR area activity that was 2.3, 9.0, and 2.0 times greater than that on carbon-supported gold nanoparticles (Au/C), bulk polycrystalline gold, and Pt/C, respectively. The PdNTs also had lower onset potentials than Pd/C and Pt/C for the oxidation of methanol (0.236 V), ethanol (0.215 V), and ethylene glycol (0.251 V). In comparison to Pt/C, the PdNTs and AuNTs further demonstrated improved alcohol tolerance during the ORR.

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