100 u03bcm to 250 u03bcm the carbonaceous material 42 should be selected from highly conductive ones such as ketjen black or functional carbonaceous materials such as carbon nanotube and fullerene the porous electrically conductive material should have a porosity higher than 80 preferably higher than 90 and a pore diameter of 9 nm to 1 mm preferably 9 nm to 600 u03bcm more preferably 1 u03bcm to 600 u03bcm most desirably 30 u03bcm to 400 u03bcm and typically 80 u03bcm to 230 u03bcm the porous electrically conductive material is produced in the following manner the process starts with providing the skeleton 41 of foamed metal or alloy such as foamed nickel a shown in fig9 a then the skeleton 41 of foamed metal or alloy is coated with a carbonaceous material 42 by any known coating method as shown in fig9 b a typical coating method is spraying with an emulsion containing carbon powder and binder the coating thickness of the carbonaceous material varies depending on the porosity and pore diameter of the skeleton 41 of foamed metal or alloy and also on the characteristic properties required of the porous electrically conductive material coating should be carried out in such a way that the pores 23 surrounded by the carbonaceous material 42 communicate with one another in this way there is obtained the porous electrically conductive material as desired.