Systematic Investigation of Iridium-Based Bimetallic Thin Film Catalysts for the Oxygen Evolution Reaction in Acidic Media

Alaina L. Strickler, Raul A. Flores, Laurie A. King, Jens K. Nørskov, Michal Bajdich*, Thomas F. Jaramillo

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Multimetallic Ir-based systems offer significant opportunities for enhanced oxygen evolution electrocatalysis by modifying the electronic and geometric properties of the active catalyst. Herein, a systematic investigation of bimetallic Ir-based thin films was performed to identify activity and stability trends across material systems for the oxygen evolution reaction (OER) in acidic media. Electron beam evaporation was used to co-deposit metallic films of Ir, IrSn2, IrCr, IrTi, and IrNi. The electrocatalytic activity of the electrochemically oxidized alloys was found to increase in the following order: IrTi <IrSn2 <Ir ∼ IrNi <IrCr. The IrCr system demonstrates two times the catalytic activity of Ir at 1.65 V versus RHE. Density functional theory calculations suggest that this enhancement is due to Cr active sites that have improved oxygen binding energetics compared to those of pure Ir oxide. This work identifies IrCr as a promising new catalyst system that facilitates reduced precious metal loadings for acid-based OER catalysis.
Original languageEnglish
JournalACS Applied Materials and Interfaces
Volume11
Issue number37
Pages (from-to)34059-34066
Number of pages8
ISSN1944-8244
DOIs
Publication statusPublished - 2019

Keywords

  • Oxygen evolution reaction
  • Electrocatalysis
  • Acidic media
  • Cr doping
  • Density functional theory
  • Volcano plot
  • Theoretical overpotential
  • Electrochemical characterization

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