Method for functionalizing a solid substrate, other than a substrate made of gold, via specific chemical compounds

A method for functionalizing an electrically conductive substrate via a layer comprising a chemical compound, the substrate being a substrate made of a material selected from the group consisting of carbon, platinum, an indium-tin oxide and nickel, comprising:

• contacting the electrically conductive substrate with a chemical compound comprising at least a disulfide terminal group, said chemical compound satisfies formula (I):
• wherein:
• X is a charge storage group, which is a polyazacycloalkane group complexed with at least a metal element, said polyazacycloalkane group being a tetrazacycloalkane group selected from the group consisting of formula (II), formula (III) and formula (IV):
• wherein:
• R1, R2, R3 and R4 represent, independently of each other, an alkyl, aryl, alkylaryl group, a halogen atom, an (alkyl)metallocene group, wherein the alkyl, aryl, alkylaryl, (alkyl)metallocene group may be perfluorinated;
• M is a metal element having at least two degrees of oxidation;
• braces indicating the spot through which said tetraazacycloalkane group is bound to the disulfide group via a spacer group;
• L is a single bond or an organic spacer group;
• Z is a cyclic disulfide group;
• and
• n is a whole number ranging from 1 to 6;
• and
• electro-oxidizing the cyclic disulfide terminal group of said chemical compounds, causing said chemical compounds to form a layer at the surface of the electrically conductive substrate.