Spectroelectrochemical Analysis of the Water Oxidation Mechanism on Doped Nickel Oxides
Reshma R. Rao, Sacha Corby, Alberto Bucci, Miguel García‐Tecedor, Camilo A. Mesa, Jan Rossmeisl, Sixto Giménez, Julio Lloret‐Fillol, Ifan E. L. Stephens, James R. Durrant
Abstract
at 300 mV overpotential for the Fe-doped sample. Consequently, we propose that for Ni centers that bind oxygen too strongly (Mn- and Co-doped oxides), OER kinetics is limited by O-O coupling and oxygen desorption, while for Ni centers that bind oxygen too weakly (Zn-doped oxides), OER kinetics is limited by the formation of oxo groups. This study not only experimentally demonstrates the relation between electroadsorption free energy and intrinsic kinetics for OER on this class of materials but also highlights the critical role of oxidized species in facilitating OER kinetics.