2021 Volume 62 Issue 6 Pages 797-806
A time-resolved measurement system, which combined a commercially available solution-flow cell and an inductively coupled plasma mass spectrometer, was established for determining the dissolution rate of platinum (Pt) and palladium (Pd) in this study. The detection limit of the system was successfully improved by thinning the cell channel, and the limits for Pt and Pd were 0.13 pg cm−2 s−1 and 0.39 pg cm−2 s−1, respectively. When the system was applied to Pt and Pd under potential cycling that mimicked the start/stop conditions of a polymer electrolyte fuel cells (PEFCs), it was revealed that the dissolution of Pt and Pd started from a more negative potential than that reported in previous studies. In addition, we succeeded in obtaining time-resolved measurements of the Pt and Pd dissolution rates below the open circuit potential of the PEFCs (approximately 1.0 V) and clarified that the dissolution mechanisms of Pt and Pd were different.
This Paper was Originally Published in Zairyo-to-Kankyo 69 (2020) 221–230. Abstract and captions of figures, and Fig. 6 are slightly modified.
