Dual-doped graphene/perovskite bifunctional catalysts and the oxygen reduction reaction

Miguel A. Molina-García, Neil V. Rees*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
124 Downloads (Pure)

Abstract

We report the first investigation of dual-doped graphene/perovskite mixtures as catalysts for oxygen reduction. Pairwise combinations of boron, nitrogen, phosphorus and sulfur precursors were co-reduced with graphene oxide and mixed with La0.8Sr0.2MnO3 (LSM) to produce SN-Gr/LSM, PN-Gr/LSM and BN-Gr/LSM catalysts. In addition, the dual-doped graphenes, graphene, LSM, and commercial Pt/C were used as controls. The addition of LSM to the dual-doped graphenes significantly improved their catalytic performance, with optimised composition ratios enabling PN-Gr/LSM to achieve 85% of the current density of commercial Pt/C at − 0.6 V (vs. Ag/AgCl) at the same loading. The effective number of electrons increased to ca. 3.8, and kinetic analysis confirms the direct 4 electron pathway is favoured over the stepwise (2e + 2e) route: the rate of peroxide production was also found to be lowered by the addition of LSM to less than 10%.

Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalElectrochemistry Communications
Volume84
Early online date5 Oct 2017
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • Dual-doped graphene
  • Metal-free catalyst
  • Oxygen reduction reaction
  • Perovskite
  • Peroxide formation
  • Rotating-ring disk electrode

ASJC Scopus subject areas

  • Electrochemistry

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