Controllable synthesis of nanostructured metal oxide and oxyhydroxide materials via electrochemical methods

•Electrochemical methods allow the control over the particle size and shape of metal oxide and oxyhydroxide materials.•(Photo)catalytic properties depend on the structural geometry, size and crystallinity of the metal oxide and oxyhydroxide nanoparticles.•Various synthesis methods result in different nanostructure forms, namely thin films or dispersed nanoparticles.