The Dissolution Dilemma for Low Pt Loading Polymer Electrolyte Membrane Fuel Cell Catalysts

Daniel J.S. Sandbeck*, Niklas Morch Secher, Masanori Inaba, Jonathan Quinson, Jakob Ejler Sorensen, Jakob Kibsgaard, Alessandro Zana, Francesco Bizzotto, Florian D. Speck, Michael T.Y. Paul, Alexandra Dworzak, Carsten Dosche, Mehtap Oezaslan, Ib Chorkendorff, Matthias Arenz*, Serhiy Cherevko*

*Corresponding author for this work

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Abstract

Cost and lifetime currently hinder widespread commercialization of polymer electrolyte membrane fuel cells (PEMFCs). Reduced electrode Pt loadings lower costs; however, the impact of metal loading (on the support) and its relation to degradation (lifetime) remain unclear. The limited research on these parameters stems from synthetic difficulties and lack of in situ analytics. This study addresses these challenges by synthesizing 2D and 3D Pt/C model catalyst systems via two precise routes and systematically varying the loading. Pt dissolution was monitored using on-line inductively coupled plasma mass spectrometry (on-line-ICP-MS), while X-ray spectroscopy techniques were applied to establish the oxidation states of Pt in correlation with metal loading. Dissolution trends emerge which can be explained by three particle proximity dependent mechanisms: (1) shifts in the Nernst dissolution potential, (2) redeposition, and (3) alteration of Pt oxidation states. These results identify engineering limitations, which should be considered by researchers in fuel cell development and related fields.

Original languageEnglish
Article number164501
JournalJournal of the Electrochemical Society
Volume167
Issue number16
Number of pages8
ISSN0013-4651
DOIs
Publication statusPublished - 2020

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