The present invention relates to a modified tungsten oxide having an atomic concentration of 0.5 to 7.0%, preferably from 2.0 to5.0%,of nitrogen atoms in lattice posi-tion, with respect to the total number of atoms of the oxide, having a surface morphology,detectable by means of a scanning electron microscope, characterized by nanostructures in the form of vermiform or branched open swellings, preferably having a length ranging from 200to2,000nm, and a width ranging from 50 to 300nm, having an appearance similar to Rice Krispies.The present invention also relates to a process for the preparation of the above oxide by the anodization of metallic tungsten, and also a photoanode comprising the above oxide.
Modified Tungsten Oxide and Process for its Preparation
CARAMORI, Stefano;V. Cristino;BIGNOZZI, Carlo Alberto
2011
Abstract
The present invention relates to a modified tungsten oxide having an atomic concentration of 0.5 to 7.0%, preferably from 2.0 to5.0%,of nitrogen atoms in lattice posi-tion, with respect to the total number of atoms of the oxide, having a surface morphology,detectable by means of a scanning electron microscope, characterized by nanostructures in the form of vermiform or branched open swellings, preferably having a length ranging from 200to2,000nm, and a width ranging from 50 to 300nm, having an appearance similar to Rice Krispies.The present invention also relates to a process for the preparation of the above oxide by the anodization of metallic tungsten, and also a photoanode comprising the above oxide.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
