Carboxylated, Fe-Filled Multiwalled Carbon Nanotubes as Versatile Catalysts for O2 Reduction and H2 Evolution Reactions at Physiological pH

M. Victoria Bracamonte, Michele Melchionna, Antoine Stopin, Angela Giulani, Claudio Tavagnacco, Yann Garcia, Paolo Fornasiero, Davide Bonifazi, Maurizio Prato

Research output: Contribution to journalArticlepeer-review

Abstract

The development of new electrocatalysts for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) at physiological pH is critical for several fields, including fuel cells and biological applications. Herein, the assembly of an electrode based on carboxyl-functionalised hydrophilic multiwalled carbon nanotubes (MWCNTs) filled with Fe phases and their excellent performance as electrocatalysts for ORR and HER at physiological pH are reported. The encapsulated Fe dramatically enhances the catalytic activity, and the graphitic shells play a double role of efficiently mediating the electron transfer to O<inf>2</inf> and H<inf>2</inf>O reactants and providing a cocoon that prevents uncontrolled Fe oxidation or leaching.

Original languageEnglish
Pages (from-to)12769-12777
Number of pages9
JournalChemistry: A European Journal
Volume21
Issue number36
DOIs
Publication statusPublished - 1 Sep 2015

Keywords

  • electrochemistry
  • hydrogen evolution reaction
  • iron
  • nanotubes
  • oxygen reduction reaction

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