A Porous Pyrochlore Y2[Ru1.6Y0.4]O7–δ Electrocatalyst for Enhanced Performance towards the Oxygen Evolution Reaction in Acidic Media

Jaemin Kim, Pei Chieh Shih, Yao Qin, Zaid Al-Bardan, Cheng Jun Sun, Hong Yang

Research output: Contribution to journalArticlepeer-review

Abstract

A robust porous structure is often needed for practical applications in electrochemical devices, such as fuel cells, batteries, and electrolyzers. While templating approach is useful for the preparation of porous materials in general, it is not effective for the synthesis of oxide-based electrocatalysts owing to the chemical instability of disordered porous materials thus created. Now the synthesis of phase-pure porous yttrium ruthenate pyrochlore oxide using an unconventional porogen of perchloric acid is presented. The lattice oxygen defects are formed by the mixed-valence state of Ru4+/5+ through the partial substitution of Ru4+ with Y3+ cations, leading to the formation of mixed B-site Y2[Ru1.6Y0.4]O7−δ. This porous Y2[Ru1.6Y0.4]O7−δ electrocatalyst exhibits a turnover frequency (TOF) of 560 s−1 (at 1.5 V versus RHE) for the oxygen evolution reaction, which is two orders of magnitude higher than that of the RuO2 reference catalyst (5.41 s−1).

Original languageEnglish (US)
Pages (from-to)13877-13881
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number42
DOIs
StatePublished - Oct 15 2018

Keywords

  • electrocatalysis
  • oxygen evolution reaction
  • porous metal oxides
  • pyrochlore
  • water splitting

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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