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Keywords:

  • anions;
  • carbon nanotubes;
  • ionic liquids;
  • nanoparticles;
  • palladium

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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Featured Compounds

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Compound 3a
Molecular Weight:766.6
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 3b
Molecular Weight:899.96
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 3c
Molecular Weight:1040.96
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 3d
Molecular Weight:958.6
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 3e
Molecular Weight:920.66
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 3f
Molecular Weight:1095.14
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 1a
Molecular Weight:457.397
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 1b
Molecular Weight:546.299
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 1c
Molecular Weight:640.3001
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 2a
Molecular Weight:660.184
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 2b
Molecular Weight:793.537
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 2c
Molecular Weight:934.5388
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 2
Molecular Weight:Not Available
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 1
Molecular Weight:Not Available
Molecular Formula:Not Available
InChIKey:Not Available
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Compound 3
Molecular Weight:Not Available
Molecular Formula:Not Available
InChIKey:Not Available
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