NOVELTY - Method of water splitting comprises: forming photocatalytic capped colloidal nanocrystals; depositing the colloidal nanocrystals onto substrate; orienting nanocrystals; linearly polarizing irradiated light with reflective surface; absorbing irradiated light with energy equal to or greater than band gap of semiconductor nanocrystals by the colloidal nanocrystals to create charge carriers in a conduction band of the colloidal nanocrystals and holes in valence band of the colloidal nanocrystals; passing water through reaction vessel; and collecting hydrogen and oxygen gases.    USE - The method is useful for water splitting to produce hydrogen and oxygen that are used as fuels.    ADVANTAGE - The method: employing oriented photoactive material achieves greater sunlight energy extraction; and utilizes semiconductor nanocrystals that provide higher surface area for absorption of light.    DETAILED DESCRIPTION - Method of water splitting comprises: forming photocatalytic capped colloidal nanocrystals, where each photocatalytic capped colloidal nanocrystal includes a first semiconductor nanocrystal capped with a first inorganic capping agent; depositing the colloidal nanocrystals onto a substrate; orienting the photocatalytic capped colloidal nanocrystals, where the oriented photocatalytic capped colloidal nanocrystals are included in a reaction vessel; linearly polarizing irradiated light with at least one reflective surface; absorbing the irradiated light with an energy equal to or greater than the band gap of the semiconductor nanocrystals by the photocatalytic capped colloidal nanocrystals to create charge carriers in a conduction band of the photocatalytic capped colloidal nanocrystals and holes in a valence band of the photocatalytic capped colloidal nanocrystals; passing water through the reaction vessel so that the water reacts with the photocatalytic capped colloidal nanocrystals and forms hydrogen gas and oxygen gas, where the charge carriers in the conduction band reduce hydrogen molecules from the water and the holes oxidize oxygen molecules from the water; and collecting the hydrogen gas and the oxygen gas in a reservoir that includes a hydrogen permeable membrane and an oxygen permeable membrane.