NOVELTY - Forming photoanode for catalytic production of oxygen from water, involves providing a solution comprising metal ionic species and anionic species; providing a photoactive electrode comprising a photoactive composition and a photosensitizing agent; and causing the metal ionic species and the anionic species to form a catalytic material associated with the photoactive electrode by application of a voltage to the photoactive electrode.    USE - For forming photoanode for catalytic production of oxygen from water (claimed); and for electrolysis of water which can be used for energy storage.    ADVANTAGE - The method allows for the facile, low-energy conversion of water to hydrogen gas and/or oxygen gas using photoactive electrode. The catalytic material is made of readily-available, low-cost material and easy to make. The method has the potential to dramatically change the field of solar energy capture, storage, and use.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) photoanode comprising photoactive electrode that comprises photoactive composition and photosensitizing agent; and a catalytic material associated with the photoactive electrode, where the cobalt ions and anionic species comprises phosphorus;    (2) producing (M1) oxygen from water involving providing photoelectrochemical cell having photoactive electrode comprising photoactive composition and photosensitizing agent; an electrolyte; and a catalytic material integrally connected to the photosensitizing agent, where the catalytic material comprises metal ionic species and anionic species, and the catalytic material does not consist of metal oxide or metal hydroxide; and illuminating the cell with light to produce oxygen gas from water;    (3) photoelectrochemical device for electrolysis of water, comprising the photoanode; and    (4) photoelectrochemical cell comprising photoanode that comprises photoactive electrode comprising and photoactive composition and photosensitizing agent; and catalytic material comprising metal ionic species and anionic species, where the catalytic material does not consist of metal oxide or metal hydroxide; at least one second electrode; and an electrolyte; where the cell produces oxygen gas from water.