Oxygen Evolution Catalysis with Mössbauerite—A Trivalent Iron-Only Layered Double Hydroxide

Ertl, M. and Andronescu, C. and Moir, J. and Zobel, M. and Wagner, F.E. and Barwe, S. and Ozin, G. and Schuhmann, W. and Breu, J.

Volume: 24 Pages: 9004-9008
DOI: 10.1002/chem.201801938
Published: 2018

Mössbauerite is investigated for the first time as an “iron-only” mineral for the electrocatalytic oxygen evolution reaction in alkaline media. The synthesis proceeds via intermediate mixed-valence green rust that is rapidly oxidized in situ while conserving the layered double hydroxide structure. The material catalyzes the oxygen evolution reaction on a glassy carbon electrode with a current density of 10 mA cm−2 at 1.63 V versus the reversible hydrogen electrode. Stability measurements, as well as post-electrolysis characterization are presented. This work demonstrates the applicability of iron-only layered double hydroxides as earth-abundant oxygen evolution electrocatalysts. Mössbauerite is of fundamental importance since as an all Fe3+ material its performance has no contributions from unknown synergistic effects as encountered for mixed valence Co/Ni/Fe LDH. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

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