| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electrode catalyst that has superior activity in both of mass activity and specific activity. <P>SOLUTION: This is the electrode catalyst that is formed by a catalyst component which contains platinum of 70 atom% or more against catalyst component of 100 atom% is carried by a conductive carrier, and in this electrode catalyst, a peak current value (I<SB>190-230 mV</SB>) within a range of 190-230 mV in a hydrogen adsorption-desorption current of the hydrogen adsorption desorption wave form by a cyclic voltammetric method, and a peak current value at 250-270 mV, or an inflection point current value (I<SB>250-270 mV</SB>) satisfy a relationship of an expression. <P>COPYRIGHT: (C)2008,JPO&INPIT |
