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

Strickler, Alaina L, Flores, Raul A, King, Laurie A ORCID: https://orcid.org/0000-0002-0772-2378, Nørskov, Jens K, Bajdich, Michal and Jaramillo, Thomas F (2019) Systematic Investigation of Iridium-Based Bimetallic Thin Film Catalysts for the Oxygen Evolution Reaction in Acidic Media. ACS Applied Materials and Interfaces, 11 (37). pp. 34059-34066. ISSN 1944-8244

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Official URL: https://pubs.acs.org/doi/10.1021/acsami.9b13697

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.

Item Type:	Article
Peer-reviewed:	Yes
Date Deposited:	05 Nov 2019 09:55
Publisher:	American Chemical Society
Additional Information:	This is an Author Accepted Manuscript of an article published in ACS Applied Materials and Interfaces by ACS.
Divisions:	Faculties > Science and Engineering
Subject terms:	Science & Technology, Technology, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Science & Technology - Other Topics, Materials Science, oxygen evolution reaction, electrocatalysis, acidic media, Cr doping, volcano plot, theoretical overpotential, electrochemical characterization, density functional theory, ELECTRONIC-STRUCTURE, WATER OXIDATION, EFFICIENT, ELECTROCATALYSTS, REDUCTION, PARTICLES, PLATINUM, ORIGIN, Cr doping, acidic media, density functional theory, electrocatalysis, electrochemical characterization, oxygen evolution reaction, theoretical overpotential, volcano plot, 0904 Chemical Engineering, 0303 Macromolecular and Materials Chemistry, 0306 Physical Chemistry (incl. Structural), Nanoscience & Nanotechnology
URI:	https://e-space.mmu.ac.uk/id/eprint/624295
DOI:	https://doi.org/10.1021/acsami.9b13697
ISSN	1944-8244
e-ISSN	1944-8252

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