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Published on: May 2, 2014
Transient Behavior of Ni@NiO Functionalized SrTiO3 in Overall Water Splitting
Kai Han1, Tomas Kreuger1, Bastian Mei1
1Photocatalytic Synthesis Group, MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente , Meander 229, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Abstract:
Transients in the composition of Ni@NiO core-shell co-catalysts deposited on SrTiO3 are discussed on the basis of state-of-the-art continuous analysis of photocatalytic water splitting, and post-XPS and TEM analyses. The formation of excessive hydrogen (H2:O2 ≫ 2) in the initial stages of illumination demonstrates oxidation of Ni(OH)2 to NiOOH (nickel oxyhydroxide), with the latter catalyzing water oxidation. A disproportionation reaction of Ni and NiOOH, yielding Ni(OH)2 with residual embedded Ni, occurs when illumination is discontinued, which explains repetitive transients in (excess) hydrogen and oxygen formation when illumination is reinitiated.
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