The Influence of Experimental Conditions on the Catalyst Degradation in the Accelerated Durability Test using a Rotating Disk Electrode

摘要

Accelerated durability tests were carried out for a carbon-supported platinum catalyst using a rotating disk electrode at various rotation rates for various amounts of the catalyst. The loss of the normalized electrochemical surface area (ECSA) of Pt increased with increasing the rotation rate and/or decreasing the catalyst amount. The detailed analysis showed that the reciprocal of the normalized ECSA loss rate linearly increases with the increase in ω~(-?) or the catalyst amount. By extrapolating these linear relations to zero, the ECSA loss rate at the hypothetical conditions, in which all the dissolved Pt ions would flow out to the electrolyte without re-deposition, was obtained.