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000454023 1001_ $$00000-0003-4472-955X$$aGörlin, Mikaela$$b0$$eCorresponding author
000454023 245__ $$aKey activity descriptors of nickel-iron oxygen evolution electrocatalysts in the presence of alkali metal cations
000454023 260__ $$a[London]$$bNature Publishing Group UK$$c2020
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000454023 520__ $$aEfficient oxygen evolution reaction (OER) electrocatalysts are pivotal for sustainable fuel production, where the Ni-Fe oxyhydroxide (OOH) is among the most active catalysts for alkaline OER. Electrolyte alkali metal cations have been shown to modify the activity and reaction intermediates, however, the exact mechanism is at question due to unexplained deviations from the cation size trend. Our X-ray absorption spectroelectrochemical results show that bigger cations shift the Ni2+/(3+δ)+ redox peak and OER activity to lower potentials (however, with typical discrepancies), following the order CsOH > NaOH ≈ KOH > RbOH > LiOH. Here, we find that the OER activity follows the variations in electrolyte pH rather than a specific cation, which accounts for differences both in basicity of the alkali hydroxides and other contributing anomalies. Our density functional theory-derived reactivity descriptors confirm that cations impose negligible effect on the Lewis acidity of Ni, Fe, and O lattice sites, thus strengthening the conclusions of an indirect pH effect.
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000454023 7001_ $$aHalldin Stenlid, Joakim$$b1
000454023 7001_ $$aKoroidov, Sergey$$b2
000454023 7001_ $$aWang, Hsin-Yi$$b3
000454023 7001_ $$aBörner, Mia$$b4
000454023 7001_ $$aShipilin, Mikhail$$b5
000454023 7001_ $$0P:(DE-H253)PIP1008420$$aKalinko, Aleksandr$$b6
000454023 7001_ $$0P:(DE-H253)PIP1020056$$aMurzin, Vadim$$b7
000454023 7001_ $$00000-0002-6772-1414$$aSafonova, Olga V.$$b8
000454023 7001_ $$aNachtegaal, Maarten$$b9
000454023 7001_ $$aUheida, Abdusalam$$b10
000454023 7001_ $$00000-0002-0074-3504$$aDutta, Joydeep$$b11
000454023 7001_ $$aBauer, Matthias$$b12
000454023 7001_ $$aNilsson, Anders$$b13
000454023 7001_ $$0P:(DE-H253)PIP1081810$$aDiaz Morales, Oscar$$b14$$eCorresponding author
000454023 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/s41467-020-19729-2$$gVol. 11, no. 1, p. 6181$$n1$$p6181$$tNature Communications$$v11$$x2041-1723$$y2020
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