Preparation of nano-tubular titania substrates having gold...

H - Electricity – 01 – L

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H01L 21/205 (2006.01)

Patent

CA 2633531

The invention relates to a method of making a nanotubular titania substrate having a titanium dioxide surface comprised of a plurality of vertically oriented titanium dioxide nanotubes containing oxygen vacancies. The method generally comprises the steps of anodizing a titanium metal substrate in an acidified fluoride electrolyte under conditions sufficient to form a titanium oxide surface comprised of self-ordered titanium oxide nanotubes, dispersing gold nanoparticles onto the titanium oxide surface, annealing the titanium oxide surface with the gold nanoparticles thereon in a non-oxidizing atmosphere, and depositing carbon onto the annealed titanium oxide surface. The invention also relates to a hybrid gold/carbon electrode formed by the method. The invention further relates to a photo-electrolysis method for generating H2 comprising the step of irradiating a photo-anode and a photo- cathode with light under conditions suitable to generate H2, wherein the photo- anode is a nanotubular titania substrate having gold and carbon deposits.

L'invention concerne un procédé de fabrication d'un substrat nanotubulaire en dioxyde de titane, dont une surface en dioxyde de titane est composée d'une pluralité de nanotubes de dioxyde de titane orientés verticalement et contenant des lacunes d'oxygène. Le procédé comprend généralement les étapes consistant à : anodiser un substrat en titane métallique dans un électrolyte fluorure acidifié, dans des conditions suffisantes pour former une surface d'oxyde de titane constituée de nanotubes d'oxyde de titane ordonnés ; disperser des nanoparticules d'or sur la surface d'oxyde de titane, recuire la surface d'oxyde de titane portant les nanoparticules d'or sous une atmosphère non oxydante ; puis déposer du carbone sur la surface d'oxyde de titane recuite. L'invention concerne aussi une électrode hybride or/carbone formée via le procédé précédent et un procédé de photo-électrolyse destiné à générer du dihydrogène (H2), le procédé comprenant l'étape consistant à irradier par de la lumière une photo-anode et une photo-cathode dans des conditions favorables à la production de H2, la photo-anode étant formée d'un substrat en dioxyde de titane comportant des dépôts d'or et de carbone.

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