Role of the Carbon Support on the Oxygen Reduction and Evolution Activities in LaNiO3 Composite Electrodes in Alkaline Solution

Caleb T. Alexander, Artem M. Abakumov, Robin P. Forslund, Keith P. Johnston, Keith J. Stevenson

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Metal-air batteries and fuel cells show a great deal of promise in advancing low-cost, high-energy-density charge storage solutions for sustainable energy applications. To improve the activities and stabilities of electrocatalysts for the critical oxygen reduction and evolution reactions (ORR and OER, respectively), a greater understanding is needed of the catalyst/carbon interactions and carbon stability. Herein, we report how LaNiO3 (LNO) supported on nitrogen-doped carbon nanotubes (N-CNT) made from a high-yield synthesis lowers the overpotential for both the OER and ORR markedly to enable a low bifunctional window of 0.81 V at only a 51 μg cm-2 mass loading. Furthermore, the addition of LNO to the N-CNTs improves the galvanostatic stability for the OER by almost 2 orders of magnitude. The nanoscale geometries of the perovskites and the CNTs enhance the number of metal-support and charge transfer interactions and thus the activity. We use rotating ring disk electrodes (RRDEs) combined with Tafel slope analysis and ICP-OES to quantitatively separate current contributions from the OER, carbon oxidation, and even anodic iron leaching from carbon nanotubes.

Original languageEnglish
Pages (from-to)1549-1558
Number of pages10
JournalACS Applied Energy Materials
Volume1
Issue number4
DOIs
Publication statusPublished - 23 Apr 2018

Keywords

  • carbon oxidation
  • catalyst corrosion
  • CNT
  • N-CNT
  • oxygen evolution reaction
  • oxygen reduction reaction
  • perovskite

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