The invention relates to methods for producing a porous electrode, said electrode comprising a layer deposited on a substrate, being binder-free and having a porosity of more than 30 and less than 50 volume %, and pores having an average diameter of less than 50 nm, said method comprising:



(a) providing a colloidal suspension containing aggregates or agglomerates of nanoparticles of at least one material P having an average primary diameter of 80 nm or less, said aggregates or agglomerates having an average diameter comprised between 80 nm and 300 nm,
(b) providing a substrate,
(c) depositing a mesoporous, electrode layer on the substrate by electrophoresis, ink-jet, doctor blade, roll coating, curtain coating or dip-coating, from the colloidal suspension provided
in step (a);
(d) drying said layer, preferably in an air flow, and
(e) consolidating the porous, preferably mesoporous electrode layer obtained in step (d) by pressing and/or heating.