We also found a clear trend in the dependence of the activity on the Fe concentration in Co 1+δ Fe 2−δ O 4 (111) in the given concentration range: films with a lower Fe concentration have the higher activity, see panel b.
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Comparative study of Co<sub>3</sub>O<sub>4</sub>(111), CoFe<sub>2</sub>O<sub>4</sub>(111), and Fe<sub>3</sub>O<sub>4</sub>(111) thin film electrocatalysts for the oxygen evolution reaction.
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