Key activity descriptors of nickel-iron oxygen evolution electrocatalysts in the presence of alkali metal cations

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,...

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Vydané v:	Nature communications Ročník 11; číslo 1; s. 6181 - 11
Hlavní autori:	Görlin, Mikaela, Halldin Stenlid, Joakim, Koroidov, Sergey, Wang, Hsin-Yi, Börner, Mia, Shipilin, Mikhail, Kalinko, Aleksandr, Murzin, Vadim, Safonova, Olga V., Nachtegaal, Maarten, Uheida, Abdusalam, Dutta, Joydeep, Bauer, Matthias, Nilsson, Anders, Diaz-Morales, Oscar
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	London Nature Publishing Group UK 02.12.2020 Nature Publishing Group Nature Portfolio
Predmet:	119/118 147/135 639/301/299/161 639/301/299/886 639/638/563/606 639/638/563/979 639/638/77/886 Acidity Alkali metals Anomalies Basicity Catalysts Catalytic activity Cations Density functional theory Electrocatalysts Electrolytes Evolution Fuel production Humanities and Social Sciences Hydroxides Intermediates Lattice sites Metal ions multidisciplinary Nickel Nickel iron Oxygen Oxygen evolution reactions pH effects Science Science (multidisciplinary) Sodium hydroxide Sustainable production X ray absorption
ISSN:	2041-1723, 2041-1723
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Shrnutí:	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 Ni 2+/(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. It is commonly accepted that electrolyte alkali metal cations modify the catalytic activity for oxygen evolution reaction. Here the authors challenge this assumption, showing that the activity is actually affected by a change in the electrolyte pH rather than a specific alkali cation.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	2041-1723 2041-1723
DOI:	10.1038/s41467-020-19729-2