Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 37, Pages 34059-34066Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13697
Keywords
oxygen evolution reaction; electrocatalysis; acidic media; Cr doping; volcano plot; theoretical overpotential; electrochemical characterization; density functional theory
Funding
- U.S. Department of Energy, Chemical Sciences, Geosciences, and Biosciences (CSGB), Division of the Office of Basic Energy Sciences [DE-AC02-76SF00515]
- National Science Foundation Graduate Research Fellowship Program (NSF-GRFP)
- National Science Foundation [ECCS-1542152]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
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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 similar to 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.
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