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Impact of Anions on Electrocatalytic Activity in Palladium Nanoparticles Supported on Ionic Liquid–Carbon Nanotube Hybrids for the Oxygen Reduction Reaction

Authors

  • Ju Yeon Shin,

    1. Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419
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    • These authors contributed equally to this work.

  • Youn Soo Kim,

    1. Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419
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    • These authors contributed equally to this work.

  • Prof. Youngmi Lee,

    1. Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419
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  • Dr. Jun Ho Shim,

    1. Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419
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  • Prof. Chongmok Lee,

    Corresponding author
    1. Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419
    • Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419

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  • Prof. Sang-gi Lee

    Corresponding author
    1. Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419
    • Department of Chemistry and Nano Science (BK21), Ewha Womans University, 120-750 Seoul (Korea), Fax: (+82) 2-3277-3419

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Abstract

A series of palladium nanoparticles supported on carbon nanotubes (CNTs), which were functionalized covalently with imidazolium polymer salts with different anions, Pd/polyIL(X)–CNTs (IL=ionic liquid; X=Cl, Br, I, ClO4, BF4, PF6), were prepared to investigate the influence of imidazolim salt anions on electrocatalytic activity in the oxygen reduction reaction (ORR). The anions of the imidazolium moiety significantly impacted on the ORR kinetics in a 0.1 M solution of HClO4. The electronically active surface area results are in good agreement with the order of the ORR kinetic activity of the supported Pd/polyIL(X)–CNTs (X: Cl>ClO4>BF4>Br≈PF6≫I). In contrast, owing to the facile anion exchange of halide anions with hydroxide anions, anion-dependent catalytic activity has not been observed in 0.1 M NaOH. Iterative ORR experiments in acid–base solutions demonstrated anion exchange on the electrode. These results indicate that subtly varied structures of the IL moiety profoundly influence the performance of IL–CNT hybrid materials and molecular-level control of interfacial interactions between the support material, catalysts, and electrolytes is important in the design of supported metal nanoparticle catalysts for fuel cells.

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