Trends in reactivity of electrodeposited 3d transition metals on gold revealed by operando soft x-ray absorption spectroscopy during water splitting

doi:10.1088/1361-6463/50/2/024002

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Title:	Trends in reactivity of electrodeposited 3d transition metals on gold revealed by operando soft x-ray absorption spectroscopy during water splitting
Authors:	J J Velasco-Vélez;Travis E Jones;Verena Pfeifer;Chung-Li Dong;Yu-Xun Chen;Chieh-Ming Chen;Hsin-Yu Chen;Ying-Rui Lu;Jin-Ming Chen;R Schlögl;A Knop-Gericke;C-H Chuang
Keywords:	operando soft x-ray absorption;trends in activity/stability;3d transition metals;water splitting
Date:	2016-12-02
Issue Date:	2017-01-13 02:10:31 (UTC+8)
Publisher:	IOP science
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 (2), p.024002(10 pages)
DOI:	10.1088/1361-6463/50/2/024002
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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