Importance of Surface IrOx in Stabilizing RuO2 for Oxygen Evolution

Escudero-Escribano, María; Pedersen, Anders F.; Paoli, Elisa A.; Frydendal, Rasmus; Friebel, Daniel; Malacrida, Paolo; Rossmeisl, Jan; Stephens, Ifan E.  L.; Chorkendorff, Ib

doi:10.1021/acs.jpcb.7b07047

Title: Importance of Surface IrO_x in Stabilizing RuO₂ for Oxygen Evolution

Journal Article · Wed Oct 18 00:00:00 EDT 2017 · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry

DOI:https://doi.org/10.1021/acs.jpcb.7b07047· OSTI ID:1471514

Escudero-Escribano, María ^[1]; Pedersen, Anders F. ^[2]; Paoli, Elisa A. ^[2]; Frydendal, Rasmus ^[2]; Friebel, Daniel ^[3]; Malacrida, Paolo ^[2]; Rossmeisl, Jan ^[4]; Stephens, Ifan E. L. ^[5];

^[2]

Univ. of Copenhagen (Denmark). Nano-Science Centre. Dept. of Chemistry; Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Physics; Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis. Dept. of Chemical Engineering
Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Physics
Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis. Dept. of Chemical Engineering
Univ. of Copenhagen (Denmark). Nano-Science Centre. Dept. of Chemistry
Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Physics; Imperial College London (United Kingdom). Dept. of Materials

The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. In this paper, we explore the OER activity and stability in acidic electrolyte of a combined IrO_x/RuO₂ system consisting of RuO₂ thin films with submonolayer (1, 2, and 4 Å) amounts of IrO_x deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO₂ structure with some Ir sites occupied by Ru, IrO_x being at the surface of the RuO₂ thin film. We monitor corrosion on IrO_x/RuO₂ thin films by combining electrochemical quartz crystal microbalance (EQCM) with inductively coupled mass spectrometry (ICP-MS). We elucidate the importance of submonolayer surface IrO_x in minimizing Ru dissolution. Finally, our work shows that we can tune the surface properties of active OER catalysts, such as RuO₂, aiming to achieve higher electrocatalytic stability in PEM electrolyzers.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Univ. of Copenhagen (Denmark); Technical Univ. of Denmark, Lyngby (Denmark)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Danish Council for Independent Research (Denmark); Danish Ministry of Higher Education and Science (Denmark); Villum Foundation (Denmark)

Grant/Contract Number:: AC02-76SF00515; 9455

OSTI ID:: 1471514

Journal Information:: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Vol. 122, Issue 2; ISSN 1520-6106

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 72 works

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Title: Importance of Surface IrO_x in Stabilizing RuO₂ for Oxygen Evolution