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Intermetallic Fe6Ge5 formation and decay of a core–shell structure during the oxygen evolution reaction

Hausmann, J. Niklas; Khalaniya, Roman A.; Das, Chittaranjan; Remy-Speckmann, Ina; Berendts, Stefan; Shevelkov, Andrei V.; Driess, Matthias; Menezes, Prashanth W.

FG Metallorganische Chemie und Anorganische Materialien

Herein, we report on intermetallic iron germanide (Fe6Ge5) as a novel oxygen evolution reaction (OER) precatalyst with a Tafel slope of 32 mV dec−1 and an overpotential of 272 mV at 100 mA cm−2 in alkaline media. Furthermore, we uncover the in situ formation of a core–shell like structure that slowly collapses under OER conditions.