This talk will focus on the relationship between the atomic-scale structure and chemistry of Co- and Ni-oxide nanoislands supported on Au. First, I will present our recent findings on the stability of CoOx @ Au.1 We find that conversion from Co2+ to Co3+ occurs by a facile incorporation of oxygen at the interface between the Co-oxide nanoisland and Au, changing the islands from a Co-O-bilayer to an O-Co-O trilayer. The O-Co-O trilayer islands have the structure of a single layer of, proposed to be the active phase for the oxygen evolution reaction (OER). Then I will discuss dissociation of H2O on the basal planes and different edges of these CoOx structures. Second, I will present our latest results on a high performance OER catalyst, namely, NiCeOx supported on Au. The activity of this system is attributed to a 3D active site consisting of under-coordinated doped edge sites that are part of a hydrogenated Ni-oxide supported on Au. We find that it should be possible to deconvolute the effects of coordination of the active site, of doping, and support by careful design of the studied systems. 1. A.S. Walton, J. Fester, M. Bajdich, M. A. Arman, J. Osiecki, J. Knudsen, A. Vojvodic, and J.V. Lauritsen, ACS Nano 9, 2445- 2453 (2015).

Stability, reactivity, and activity of nano-structured oxides supported on gold

251st National Meeting (2016)

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