Screening Bifunctional Pt Based NSTF Catalysts for Durability with the Rotating Disk Electrode: The Effect of Ir and Ru

Crowtz, T. C.; Dahn, Jeff R.

doi:10.1149/2.0891810jes

Title: Screening Bifunctional Pt Based NSTF Catalysts for Durability with the Rotating Disk Electrode: The Effect of Ir and Ru

Journal Article · 26 July 2018 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/2.0891810jes · OSTI ID:1510047

^[1];

^[2]

Dalhousie Univ., Halifax, NS (Canada). Dept. of Mechanical Engineering; Calhousie Univ., Halifax (Canada)
Dalhousie Univ., Halifax, NS (Canada). Dept. of Mechanical Engineering and Dept. of Physics and Atmospheric Science

Various amounts of Ir (<20 μg cm^-2) and Ru (up to 12 μg cm^-2) on a consistent base Pt loading of 85 μg cm^-2, were sputter deposited on a nanostructured thin film catalyst support to mimic a hydrogen fuel cell's cathode catalyst. The nanostructured support was grown on glassy carbon disks designed for a rotating disk electrode, which was used to simulate what happens to a fuel cell cathode during repeated start-up, operation, and shut-down. The testing protocol subjected the catalyst to a minimum potential of 0.65 V_RHE and a maximum between 1.53 and 1.8 V_RHE. The upper potential was achieved with a galvanostatic hold which is an alternative way to simulate potential transients on the cathode caused by start-up and shut-down. Increasing Ir loading improved the durability of both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity. When combined with Ir, Ru provided no benefit to OER durability except at an Ir loading of 10 μg cm^-2. Ru addition (no Ir present) improved the ORR durability compared to pure Pt. ORR durability was not influenced by Ru addition to Ir-containing samples. In general, ORR durability showed no dependence on Ru loading for all the Ru containing samples and ORR activity was decreased by OER catalyst addition, though more so for Ir than Ru.

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Research Organization:: 3M Co., St. Paul, MN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)

Grant/Contract Number:: EE0000456

OSTI ID:: 1510047

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 10 Vol. 165; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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