In situ electro-deposition of Pt micro-nano clusters on the surface of {[PMo12O40]3−/PAMAM}n multilayer composite films and their electrocatalytic activities regarding methanol oxidation

► LBL technique is used to fabricate the organic-inorganic composite films. ► Composite films are constructed from polyoxometalates and PAMAM. ► Composite films are used as a new matrix for electro-deposition of Pt clusters. ► Pt micro-nano clusters show the unique flower-like cluster structure. ► Composite films supported Pt clusters show good catalysis for methanol oxidation.