Platinum electrodeposition at unsupported electrochemically reduced nanographene oxide for enhanced ammonia oxidation

Lisandro Cunci, Carlos A. Velez, Ivan Perez, Amal Suleiman, Eduardo Larios, Miguel José-Yacamán, James J. Watkins, Carlos R. Cabrera

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The electrochemical reduction of highly oxidized unsupported graphene oxide nanosheets and its platinum electrodeposition was done by the rotating disk slurry electrode technique. Avoiding the use of a solid electrode, graphene oxide was electrochemically reduced in a slurry solution with a scalable process without the use of a reducing agent. Graphene oxide nanosheets were synthesized from carbon platelet nanofibers to obtain highly hydrophilic layers of less than 250 nm in width. The graphene oxide and electrochemically reduced graphene oxide/Pt (erGOx/Pt) hybrid materials were characterized through different spectroscopy and microscopy techniques. Pt nanoparticles with 100 facets, clusters, and atoms at erGOx were identified by high resolution transmission electron microscopy (HRTEM). Cyclic voltammetry was used to characterize the electrocatalytic activity of the highly dispersed erGOx/Pt hybrid material toward the oxidation of ammonia, which showed a 5-fold current density increase when compared with commercially available Vulcan/Pt 20%. This is in agreement with having Pt (100) facets present in the HRTEM images of the erGOx/Pt material.

Original languageEnglish (US)
Pages (from-to)2137-2145
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number3
DOIs
StatePublished - Feb 12 2014
Externally publishedYes

Keywords

  • Graphene
  • RoDSE
  • ammonia oxidation
  • platinum
  • unsupported electrodeposition

ASJC Scopus subject areas

  • Materials Science(all)

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