Direct O-O Coupling Promoted the Oxygen Evolution Reaction by Dual Active Sites from Ag/LaNiO3Interfaces

Seonggyu Lee, M. R. Ashwin Kishore, Dongkyu Kim, Hari Kang, Jinyoung Chun, Lee Seul Oh, Jong Hyeok Park, Hyung Ju Kim, Jong Suk Yoo, Eunho Lim

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The development of highly active oxygen evolution reaction (OER) electrocatalysts is one of the most important issues for advanced water electrolysis technology with high energy efficiency. However, according to the conventional adsorbate evolution mechanism (AEM), the OER activity is theoretically limited with high overpotential by the scaling relationship in binding energies of the reaction intermediates. We propose an attractive strategy to promote OER activity by direct O-O coupling at the interfacial active sites for Ag (x) nanoparticles decorated on La1-xNiO3perovskite electrocatalysts (Ag/LNO-x). The overpotential of the Ag/LNO-0.05 was 315 mV at a current density of 10 mA cm-2geo, which was much lower than that of other Ag/LNO-x (x = 0, 0.3, and 0.5) and commercial iridium oxide (IrO2, 398 mV) electrocatalysts. The theoretical calculation revealed that the improved OER electrocatalytic activity of Ag/LNO-x originated from a change in the reaction mechanism at the interfacial active sites. At the interface, oxygen evolution via the dual-site mechanism with direct O-O coupling becomes more favorable than that via the conventional AEM. Finally, due to the formation of the interfacial active sites, the synthesized Ag/LNO-0.05 electrocatalyst showed significantly enhanced OER activity, which was 20 times higher mass activity before and 74 times after an accelerated durability test than that of the IrO2electrocatalyst.

Original languageEnglish
Pages (from-to)14658-14668
Number of pages11
JournalACS Applied Energy Materials
Volume5
Issue number12
DOIs
StatePublished - 26 Dec 2022

Keywords

  • LaNiO
  • electrocatalysts
  • interfacial active sites
  • oxygen evolution reactions
  • silver

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