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Electrocatalytic oxygen reduction on single-walled carbon nanotubes supported Pt alloys nanoparticles in acidic and alkaline conditions

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Abstract

The objective of this study is to improve the catalytic activity of platinum by alloying with transition metal (Pd) in gas diffusion electrodes (GDEs) by oxygen reduction reaction (ORR) at cathode site and comparison of the acidic and alkaline electrolytes. The high porosity of single-walled carbon nanotubes (SWCNTs) facilitates diffusion of the reactant and facilitates interaction with the Pt surface. It is also evident that SWCNTs enhance the stability of the electrocatalyst. Functionalized SWCNTs are used as a means to facilitate the uniform deposition of Pt on the SWCNT surface. The structure of SWCNTs is nearly perfect, even after functionalization, while other types of CNTs contain a significant concentration of structural defects in their walls. So catalysts supported on SWCNTs are studied in this research.

The electrocatalytic properties of ORR were evaluated by cyclic voltammetry, polarization experiments, and chronoamperometry. The morphology and elemental composition of Pt alloys were characterized by X-ray diffraction (XRD) analysis and inductively coupled plasma atomic emission spectroscopy (ICP-AES) system. The catalytic activities of the bimetallic catalysts in GDEs have been shown to be not only dependent on the composition, but also on the nature of the electrolytes. The GDEs have shown a transition from the slow ORR kinetics in alkaline electrolyte to the fast ORR kinetics in the acidic electrolyte. The results also show that introduction of Pd as transition metal in the Pt alloys provides fast ORR kinetics in both acidic and alkaline electrolytes. The performance of GDEs with Pt–Pd alloy surfaces towards the ORR as a function of the alloy’s overall composition and their behavior in acidic electrolyte was also studied. These results show that the alloy’s overall composition and also the nature of the electrolytes have a large effect on the performance of GDEs for ORR.

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Authors and Affiliations

  1. Chemistry Department, NSTRI, Tehran, Iran

    Ahmad Nozad Golikand & Mehdi Asgari

  2. Corrosion Lab., Material School, NSTRI, Tehran, Iran

    Ahmad Nozad Golikand & Elaheh Lohrasbi

  3. Chemistry Department, Shahre Ghods Branch, Islamic Azad University, Shahre Ghods, Iran

    Mohammad Yari

Authors
  1. Ahmad Nozad Golikand
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  2. Mehdi Asgari
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  3. Elaheh Lohrasbi
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  4. Mohammad Yari
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Correspondence to Ahmad Nozad Golikand.

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Golikand, A.N., Asgari, M., Lohrasbi, E. et al. Electrocatalytic oxygen reduction on single-walled carbon nanotubes supported Pt alloys nanoparticles in acidic and alkaline conditions. J Appl Electrochem 39, 1369–1377 (2009). https://doi.org/10.1007/s10800-009-9812-7

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  • DOI: https://doi.org/10.1007/s10800-009-9812-7

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