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Dissolution of Platinum in the Operational Range of Fuel Cells
Author(s) -
Cherevko Serhiy,
Keeley Gareth P.,
Geiger Simon,
Zeradjanin Aleksandar R.,
Hodnik Nejc,
Kulyk Nadiia,
Mayrhofer Karl J. J.
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500098
Subject(s) - dissolution , platinum , inductively coupled plasma mass spectrometry , catalysis , electrode , oxide , materials science , fuel cells , inductively coupled plasma , chemical engineering , inorganic chemistry , chemistry , analytical chemistry (journal) , metallurgy , mass spectrometry , plasma , environmental chemistry , chromatography , biochemistry , physics , quantum mechanics , engineering
One of the most important practical issues in low‐temperature fuel‐cell catalyst degradation is platinum dissolution. According to the literature, it initiates at 0.6–0.9 V RHE , whereas previous time‐ and potential‐resolved inductively coupled plasma mass spectrometry (ICP–MS) experiments, however, revealed dissolution onset at only 1.05 V RHE . In this manuscript, the apparent discrepancy is addressed by investigating bulk and nanoparticulated catalysts. It is shown that, given enough time for accumulation, traces of platinum can be detected at potentials as low as 0.85 V RHE . At these low potentials, anodic dissolution is the dominant process, whereas, at more positive potentials, more platinum dissolves during the oxide reduction after accumulation. Interestingly, the potential and time dissolution dependence is similar for both types of electrode. Dissolution processes are discussed with relevance to fuel‐cell operation and plausible dissolution mechanisms are considered.