Lead ruthenate nanocrystals on reduced graphene oxides as an efficient bifunctional catalyst for metal–air batteries

Subin Na, Boeun Lee, Woo Young Yoon, Taeeun Yim, Si Hyoung Oh

Research output: Contribution to journalArticlepeer-review

Abstract

A composite consisting of lead ruthenate nanocrystals with an expanded pyrochlore structure on reduced graphene oxide nano-sheets, is reported as an efficient bifunctional catalyst for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Comparative studies for ORR show that the composite produces highly positive synergic coupling effects, strengthening a four-electron catalytic route, i.e., more positive onset potential, higher limiting current density, much smaller Tafel slope, and more durable catalytic performance after thousands of voltammetric cycling than pristine material. The composite also functions as an excellent and durable OER catalyst, exceeding the performance of NiCo2O4 and RuO2.

Original languageEnglish
Pages (from-to)409-417
Number of pages9
JournalJournal of Industrial and Engineering Chemistry
Volume79
DOIs
Publication statusPublished - 2019 Nov 25

Keywords

  • Bifunctional catalyst
  • Composite
  • Expanded pyrochlore
  • Rechargeable metal–air batteries
  • Reduced graphene oxide

ASJC Scopus subject areas

  • Chemical Engineering(all)

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