Heating purification element for purification of exhaust gas and purification device comprising such a purification element

A purification member for purifying exhaust gases of a vehicle, comprising:

• a substrate that is annular and centered on a central axis and that has an upstream face defining a first axial end of the substrate, a downstream face defining a second axial end of the substrate, an inner cylindrical face centered on the central axis and oriented toward the central axis, and an outer cylindrical face centered on the central axis and oriented opposite the central axis, the substrate comprising an inner cylindrical wall defining the inner cylindrical face and an outer cylindrical wall defining the outer cylindrical face, each of said inner and outer cylindrical walls being centered on the central axis, the substrate being made from an electrically conductive material and comprising a plurality of intersecting walls defining longitudinal cells therebetween and that each emerge in the upstream face and in the downstream face of the substrate, said plurality of intersecting walls being covered with a catalytic composition;
• a cylindrical peripheral electrode alongside and against the outer cylindrical face of the substrate;
• and
• a cylindrical central electrode alongside and against the inner cylindrical face of the substrate, and wherein each of the plurality of intersecting walls extends from the outer cylindrical wall to the inner cylindrical wall.