Activity and stability studies of platinized multi-walled carbon nanotubes as fuel cell electrocatalysts

Serban Nicolae Stamatin, Maryam Borghei, Rajnish Dhiman, Shuang Ma Andersen, Virginia Ruiz, Esko Kauppinen, Eivind Morten Skou

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Abstract

A non-covalent functionalization for multi-walled carbon nanotubes has been used as an alternative to the damaging acid treatment. Platinum nanoparticles with similar particle size distribution have been deposited on the surface modified multi-walled carbon nanotubes. The interaction between platinum nanoparticles and multi-walled carbon nanotubes functionalized with 1-pyrenecarboxylic acid is studied and its electrochemical stability investigated. This study reveals the existence of a platinum-support interaction and leads to three main conclusions. First, the addition of 1-pyrenecarboxylic acid is improving the dispersion of platinum nanoparticles, leading to an improved electrochemical activity towards oxygen reduction reaction. Second, the investigations regarding the electrochemical stability showed that the platinum-support interaction plays an important role in improving the long-term stability by as much as 20%. Third, post-mortem microscopy analysis showed a surprising effect. During the electrochemical stability investigations concerned with carbon corrosion it was found that the multi-walled carbon nanotubes were undergoing severe structural change, transforming finally into carbon spheres.
Original languageEnglish
JournalApplied Catalysis B: Environmental
Volume162
Issue numberJanuary
Pages (from-to)289-299
Number of pages11
ISSN0926-3373
DOIs
Publication statusPublished - 2015

Keywords

  • ORR
  • platinum nanoparticles
  • carbon nanotubes
  • Electrochemical stability

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