Functionalized cellular elastomer foam, and a use of a cellular elastomer foam as a catalyst substrate

A functionalized cellular elastomer able to be obtained by a method comprising:

• supplying a porous cellular elastomer foam with apparent porosity and having a mean equivalent diameter of an opening of the pores comprised between 100 μm and 5,000 μm;
• and
• placing said porous cellular elastomer foam in contact with at least one compound including at least one catechol unit, and polymerizing said compound including at least one catechol unit on the surface of said porous cellular elastomer foam, thereby obtaining a mechanically flexible substrate comprising said porous cellular elastomer foam having on its surface an intermediate phase formed from the polymerisation of said at least one compound including at least one catechol unit,
• wherein placing said porous cellular elastomer foam in contact with the at least one compound including at least one catechol unit, and polymerizing said compound including the at least one catechol unit on the surface of said porous cellular elastomer foam, comprises forming a polydopamine layer on a surface of said porous cellular elastomer foam.