Carbon nanotubes-supported colloidal Ag–Pd nanoparticles as electrocatalysts toward oxygen reduction reaction in alkaline electrolyte

Ag–Pd nanoparticles with compositional ratios of 1:1 (Ag 1Pd 1), 2:1 (Ag 2Pd 1), and 4:1 (Ag 4Pd 1) and supported on multiwall carbon nanotubes (CNTs) were prepared by the self-regulated reduction of sodium dodecyl sulfate, and then, they were used as catalysts for oxygen reduction reactions (ORRs)...

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Bibliographic Details
Published in:International journal of hydrogen energy 2011-02, Vol.36 (4), p.2759-2764
Main Authors: Lee, Chien-Liang, Chiou, Hsueh-Ping, Chang, Kun-Chuan, Huang, Chun-Han
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Catalyst
Energy
Exact sciences and technology
Fuels
Graphic nanofiber
Hydrogen
Isotherms
Kinetics
Methyl alcohol
Nanocomposites
Nanomaterials
Nanostructure
Polarization
Reduction (electrolytic)
Silver
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Summary:Ag–Pd nanoparticles with compositional ratios of 1:1 (Ag 1Pd 1), 2:1 (Ag 2Pd 1), and 4:1 (Ag 4Pd 1) and supported on multiwall carbon nanotubes (CNTs) were prepared by the self-regulated reduction of sodium dodecyl sulfate, and then, they were used as catalysts for oxygen reduction reactions (ORRs) in 1 M NaOH solution. Polarization curves showed that, among the prepared nanocatalysts, Ag 4Pd 1/CNT nanocatalysts showed higher activity. During the ORRs, two types of oxygen coverages given by the Temkin isotherm and Langmuir isotherm were observed for low and high overpotentials, respectively. Koutecky–Levich plots showed that the number of electrons involved in the ORRs catalyzed by Ag 1Pd 1/CNT, Ag 2Pd 1/CNT, and Ag 4Pd 1/CNT were 2.11, 1.88, and 2.25, respectively. These ORRs proceeded through a two-electron pathway. Polarization curve in the electrolyte with methanol revealed that Ag 4Pd 1/CNT has high methanol tolerance during ORRs.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2010.11.098