COVERAGE CALCULATION METHOD OF CATALYST FINE PARTICLE AND CATALYST FINE PARTICLE EVALUATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for more accurately calculating coverage of an outermost layer of catalyst fine particles for center particles than before, and a catalyst fine particle evaluation method applying the calculation method.SOLUTION: There is provided a method for calculating the coverage of the outermost layer covering the center particles for the center particles in the catalyst fine particles comprising the center particles and the outermost layer. The coverage calculation method includes the steps of: preparing the catalyst fine particles; performing oxygen-reducing reaction measurement for the catalyst fine particle under two or more sweep rate conditions different from one another, and selecting two of the sweep rate conditions to calculate the maintenance rate of current value for a certain potential in the sweeping range under the selected sweep rate conditions; and calculating the coverage from the maintenance rate of current value.