Customized WO 3 nanoplatelets as visible-light photoelectrocatalyst for the degradation of a recalcitrant model organic compound (methyl orange)

•Novel and high-performance WO3 nanostructures were formed in a very simple way.•Their photocatalytic behavior is influenced by their morphology and size.•The best nanostructure completely degraded methyl orange in just 1 h.•This nanostructure is an excellent photocatalyst for environmental applications.