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Journal Article

Microstructural impact of anodic coatings on the electrochemical chlorine evolution reaction

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Teschner,  Detre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Chen, R., Trieu, V., Zeradjanin, A. R., Natter, H., Teschner, D., Kintrup, J., et al. (2012). Microstructural impact of anodic coatings on the electrochemical chlorine evolution reaction. Physical Chemistry Chemical Physics, 14(20), 7392-7399. doi:10.1039/C2CP41163F.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-8561-F
Abstract
Sol-gel Ru0.3Sn0.7O2 electrode coatings with crack-free and mud-crack surface morphology deposited onto a Ti-substrate are prepared for a comparative investigation of the microstructural effect on the electro- chemical activity for Cl2 production and the Cl2 bubble evolution behavior. For comparison, a state-of-the-art mud-crack commercial Ru0.3Ti0.7O2 coating is used. The compact coating is potentially durable on a long term compared to the mud-crack coating due to the reduced penetration of electrolyte. Ti L-edge X-ray absorption spectroscopy confirms that a TiOx interlayer is formed between the mud-crack Ru0.3Sn0.7O2 coating and the underlying Ti-substrate due to the attack of the electrolyte. Meanwhile, the compact coating shows enhanced activity in comparison to the commercial coating, benefiting from the nano particle nanoporosityarchitecture.Thedependenceoftheoverallelectrodepolarizationbehaviouron the local activity and the bubble evolution behavior for the Ru0.3Sn0.7O2 coatings with different surface microstructure are evaluated by means of scanning electrochemical microscopy and microscopic bubble