Ruthenium sulphide thin layers as catalysts for the electrooxidation of water
Literature Information
Peter Bogdanoff, Carolin Zachäus, Stephan Brunken, Andreas Kratzig, Klaus Ellmer, Sebastian Fiechter
Crystalline RuS2 layers were prepared on titanium sheets by reactive magnetron sputtering using a metallic ruthenium target and a H2S–Ar mixture as process gas. The ability of these layers for the electrooxidation of water (OER) was investigated by differential electrochemical mass spectrometry (DEMS) in 0.5 M H2SO4 electrolyte. It was observed that the activity for water oxidation is increased with increasing temperature of the titanium substrate during the sputter deposition process whereas a competitive corrosion process is diminished. The reason for this effect seems to be a better crystallinity of these layers at higher substrate temperatures as it is proved by XRD analysis. In contrast to RuS2 single crystals no photo effect could be observed on the sputtered layers under illumination with a tungsten lamp. Time resolved microwave conductivity analysis indicates the presence of mobile charge carriers after illumination but apparently these cannot participate in the electrooxidation of water.
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