1 grams of chloroplatinic acid and 1 1 grams of ruthenium chloride have been used as the salt of the catalytic component the results of observation of the catalytic material in embodiment 3 and the catalytic material in comparative example 2 by use of a transmission type electron microscope are shown in fig9 the average particle size of the catalytic component in comparative example 2 is about 5 nanometers and the average particle size of the catalyst in embodiment 3 is about 2 nanometers it can therefore be seen that the catalyst particles in embodiment 3 are supported in a more finely structured condition monopolar measurements have been performed on the electrode of embodiment 3 and that of comparative example 3 by using a method similar to that of embodiment 1 as a result with the electrode of embodiment 3 a current density about 3 times that of the case of the electrode shown in comparative example 2 has been obtained at the same potential and it has thus been found that the electrode of embodiment 3 is higher in performance it has been seen therefore that combining platinum and ruthenium instead of using platinum alone is likewise effective for creating a catalytic component an equal effect has also been obtained by combining platinum and manganese or combining platinum and iron or the like also there are various types of.