Journal Article

PUBDB-2021-00380

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Key activity descriptors of nickel-iron oxygen evolution electrocatalysts in the presence of alkali metal cations

Görlin, M. (Corresponding author) ; Halldin Stenlid, J. ; Koroidov, S. ; Wang, H.-Y. ; Börner, M. ; Shipilin, M. ; Kalinko, A.Extern*DESY* ; Murzin, V.Extern* ; Safonova, O. V. ; Nachtegaal, M. ; Uheida, A. ; Dutta, J. ; Bauer, M. ; Nilsson, A. ; Diaz Morales, O. (Corresponding author)Extern*

2020
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-020-19729-2  doi:10.3204/PUBDB-2021-00380

Abstract: Efficient oxygen evolution reaction (OER) electrocatalysts are pivotal for sustainable fuel production, where the Ni-Fe oxyhydroxide (OOH) is among the most active catalysts for alkaline OER. Electrolyte alkali metal cations have been shown to modify the activity and reaction intermediates, however, the exact mechanism is at question due to unexplained deviations from the cation size trend. Our X-ray absorption spectroelectrochemical results show that bigger cations shift the Ni2+/(3+δ)+ redox peak and OER activity to lower potentials (however, with typical discrepancies), following the order CsOH > NaOH ≈ KOH > RbOH > LiOH. Here, we find that the OER activity follows the variations in electrolyte pH rather than a specific cation, which accounts for differences both in basicity of the alkali hydroxides and other contributing anomalies. Our density functional theory-derived reactivity descriptors confirm that cations impose negligible effect on the Lewis acidity of Ni, Fe, and O lattice sites, thus strengthening the conclusions of an indirect pH effect.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PET-S)
2. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
2. 6G3 - PETRA III (POF3-622) (POF3-622)
3. SWEDEN-DESY - SWEDEN-DESY Collaboration (2020_Join2-SWEDEN-DESY) (2020_Join2-SWEDEN-DESY)

Experiment(s):

1. PETRA Beamline P64 (PETRA III)

Appears in the scientific report 2020

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