Photocatalytic methods for preparation of electrocatalyst materials

A method for making a supported electrocatalyst, the method comprising:

• providing a mixture, the mixture including a photocatalyst, a reductant, a metal compound, and a support material;
• dispersing the photocatalyst on the support material and mixing the photocatalyst and the support material with the reductant and the metal compound;
• illuminating the mixture forming metal particles in situ by reduction of the metal compound on a surface of the support material forming the supported electrocatalyst in a single step wherein the metal particles have a median diameter of less than 100 nm and are evenly distributed on the support material.