Spin-coated antimony- and nickel-doped tin dioxide electrodes foranodic ozone evolution

by Joel Sjölander

Institution: Mid Sweden University
Year: 2015
Keywords: Sb/Ni-doped SnO2; Spin-coating; Ozone evolution; Engineering and Technology; Teknik och teknologier; Civilingenjör i teknisk fysik TTFYA 300 hp; Master of Science in Engineering Physics TTFYA 300 higher education credits; Engineering Physics TF1; Teknisk fysik TF1
Record ID: 1358365
Full text PDF: http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-25077


This work have served as a preliminary work for a more extensiveresearch on antimony- and nickel-doped tin dioxide electrodes used forozone generation in electrolytic reactions. The target has been to test themanufacturing process of Sb/Ni-doped SnO2 with spin-coating techniqueand succeed to make electrodes for anodic ozone evolution and tocharacterize them. Electrode manufacturing was made using sol-gelfrom chloride salts of tin, antimony and nickel, which were applied to atitanium substrate through spin-coating. The substrates were spun todifferent thickness followed by drying and baking of the substrate. A setof electrodes with three layers were made just with spin-coating, additionallya set of electrodes with twenty layers were made with bothspin-coating and dip-coating. To characterize physical properties of theelectrodes, x-ray diffraction, scanning electron microscopy and transmissionelectron microscopy were conducted. Electrochemical measurementswere made in open beakers with a platinum cathode andsulphuric acid electrolyte using a galvanostatic measurement with afixed current. To measure the ozone evolution the optical absorbancedifference from the electrolyte compared to a clean electrolyte wasmeasured, this however only measures the amount of aqueous ozonepresent. Assembling of SnO2 electrodes for ozone evolution was successful.For the three-layered electrodes the absorbance readings wereinconclusive but with the twenty-layered electrodes there was a smell ofozone present within the electrolyte and absorbance reading of the dipcoatedelectrode presented a clear peak for ozone.