Trends in activity and stability of electrodeposited 3d transition metals on gold revealed by operando soft X-ray absorption spectroscopy during water splitting

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Title:	Trends in activity and stability of electrodeposited 3d transition metals on gold revealed by operando soft X-ray absorption spectroscopy during water splitting
Authors:	Velez, 14. J. Velasco;Jones, T.;Pfeifer, V.;Dong, C. L.;Chen, Y. X.;Chen, C. M.;Chen, H. Y.;Lu, Y. R.;Chen, J.;Schlogl, R.;Knop-Gericke, A.;Chuang, C. H.
Date:	2016-09-01
Issue Date:	2017-10-25 02:11:03 (UTC+8)
Abstract:	We activated gold electrodes for their use as electrocatalyst for water splitting by electrodepositing Cu, Ni and Co. A combination of operando x-ray absorption spectroscopy and potentiometric control under aqueous conditions revealed the trends in reactivity yielded by these electrodes, which are directly associated with the cross- and overpotentials as well as the occupancy of the 3d orbitals. It was found that under anodic polarization the materials electrodeposited on gold suffer from a lack of stability, while under cathodic polarization they exhibit stable behavior. The observed activity is strongly related to the lack of stability shown by these composites under anodic polarization revealing a dynamic process ruled by corrosion. By operando x-ray absorption, we established that the overall enhancement of the activity for the oxygen evolution reaction is directly attributable to the cross-potential and corrosion process of the electrodeposited materials. It is associated with the high potential deposition, which is the origin of the incipient oxidation-corrosion resistance of the lattice. We conclude that the observed trends in the total current are directly associated with the loss of oxygen in the metal-oxide lattice and the subsequent dissolution of metallic ions in the electrolyte under anodic polarization.
Relation:	Journal of Physics D: Applied Physics 50, 024002
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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