| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oxygen reduction electrode suitably used for a cathode electrode of an electrochemical system such as an electrolysis of water, an inorganic material or an organic material or a phosphate type or high polymer solid electrolyte type fuel cell using an acidic electrolyte and having excellent oxygen reduction ability and excellent stability. <P>SOLUTION: The oxygen reduction electrode contains nitride of one or more selected from group IV elements, group V elements and group XIV elements in long periodic table and in the oxygen reduction electrode, wherein the ratio of the difference between a current value in an oxygen atmosphere measured in 0.4 V based on reversible hydrogen electrode potential and a current value in a nitrogen atmosphere to the current value in the nitrogen atmosphere is ≥0.5 when a potential is scanned in 0.1 mol/L sulfuric acid aqueous solution at 30°C. <P>COPYRIGHT: (C)2007,JPO&INPIT |
