Hydrogen template assisted electrodeposition of sub-micrometer wires composing honeycomb-like porous Pb films

► We study the effect of hydrogen co-deposition on porous Pb morphology. ► Growth of Pb wires and particles is controlled by H+ content in electrolyte. ► The obtained wires are single crystalline branches of dendrites. ► Dendrites overgrow hydrogen bubbles and form highly porous foams.