Interfacing RuO2with Pt to induce efficient charge transfer from Pt to RuO2for highly efficient and stable oxygen evolution in acidic media

Taehyun Kwon, Heesu Yang, Minki Jun, Taekyung Kim, Jinwhan Joo, Jun Kim, Hionsuck Baik, Jin Young Kim, Kwangyeol Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The oxygen evolution reaction (OER) requires a large overpotential which undermines the stability of electrocatalysts, typically IrOxor RuOx. RuOxis particularly vulnerable to high overpotential in acidic media, due to the formation of soluble species, thus making it nearly impossible to be used as a commercially viable OER electrocatalyst. Herein, we demonstrate that the charge transfer from Pt to conjoined RuO2dramatically stabilizes the RuO2phase against overoxidation, the main culprit of disintegration of RuO2. In this work, we compared the OER performance of three different types of Au@Pt@RuOxnanowires, namely, hetero-interfaced, gradient-alloy, and conformal-shell type, with varying degrees of interaction between Pt and RuO2. Among the studied samples, the hetero-interfaced type exhibited the highest OER mass activity of 1.311 A mgRu−1at 1.48 VRHEand maintained its activity durably, thus demonstrating the effectiveness of charge transfer from Pt to RuO2in the hetero-interfaced structure against overoxidation of RuO2

Original languageEnglish
Pages (from-to)14352-14362
Number of pages11
JournalJournal of Materials Chemistry A
Volume9
Issue number25
DOIs
Publication statusPublished - 2021 Jul 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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