Influence of Alkali Metal Cations on the Oxygen Reduction Activity of Pt5Y and Pt5Gd Alloys

Song, Kun-Ting; Zagalskaya, Alexandra; Schott, Christian M.; Schneider, Peter M.; Garlyyev, Batyr; Alexandrov, Vitaly; Bandarenka, Aliaksandr S.

doi:10.1021/acs.jpcc.4c00531

Title: Influence of Alkali Metal Cations on the Oxygen Reduction Activity of Pt₅Y and Pt₅Gd Alloys

Journal Article · 17 March 2024 · Journal of Physical Chemistry. C

DOI: https://doi.org/10.1021/acs.jpcc.4c00531 · OSTI ID:2469667

Song, Kun-Ting ^[1]; Zagalskaya, Alexandra ^[2]; Schott, Christian M. ^[1]; Schneider, Peter M. ^[1];

^[1];

^[3];

^[1]

Technische Univ. München, Garching (Germany)
Univ. of Nebraska, Lincoln, NE (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Univ. of Nebraska, Lincoln, NE (United States)

Electrolyte species can significantly influence the electrocatalytic performance. In this work, we investigate the impact of alkali metal cations on the oxygen reduction reaction (ORR) on active Pt₅Gd and Pt₅Y polycrystalline electrodes. Due to the strain effects, Pt alloys exhibit a higher kinetic current density of ORR than pure Pt electrodes in acidic media. In alkaline solutions, the kinetic current density of ORR for Pt alloys decreases linearly with the decreasing hydration energy in the order of Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺, whereas Pt shows the opposite trend. To gain further insights into these experimental results, we conduct complementary density functional theory calculations considering the effects of both electrode surface strain and electrolyte chemistry. The computational results reveal that the different trends in the ORR activity in alkaline media can be explained by the change in the adsorption energy of reaction intermediates with applied surface strain in the presence of alkali metal cations. Our findings provide important insights into the effects of the electrolyte and the strain conditions on the electrocatalytic performance and thus offer valuable guidelines for optimizing Pt-based electrocatalysts.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2469667

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 12 Vol. 128; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Alloys
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Electrodes
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Redox reactions

Title: Influence of Alkali Metal Cations on the Oxygen Reduction Activity of Pt5Y and Pt5Gd Alloys

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Title: Influence of Alkali Metal Cations on the Oxygen Reduction Activity of Pt₅Y and Pt₅Gd Alloys