Journal Article

FZJ-2021-00557

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Platinum Dissolution in Realistic Fuel Cell Catalyst Layers

Ehelebe, K. (Corresponding author)FZJ* ; Knöppel, J.FZJ* ; Bierling, M.FZJ* ; Mayerhöfer, B.FZJ* ; Böhm, T.FZJ* ; Kulyk, N.FZJ* ; Thiele, S.FZJ* ; Mayrhofer, K.FZJ* ; Cherevko, S.FZJ*

2021
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/27584  doi:10.1002/anie.202014711

Abstract: Pt dissolution has already been intensively studied in aqueous model systems and many mechanistic insights were gained. Nevertheless, transfer of new knowledge to real‐world fuel cell systems is still a significant challenge. To close this gap, we present a novel in‐situ method combining a gas diffusion electrode (GDE) half‐cell with inductively coupled plasma mass spectrometry (ICP‐MS). With this setup, Pt dissolution in realistic catalyst layers and the transport of dissolved Pt species through Nafion membranes are evaluated directly. We observe that (i) specific Pt dissolution is increasing significantly with decreasing Pt loading, (ii) in comparison to experiments on aqueous model systems with flow cells, the measured dissolution in GDE experiments is considerably lower and, (iii) by adding a membrane onto the catalyst layer, Pt dissolution is reduced even further. All these phenomena are attributed to the varying mass transport conditions of dissolved Pt species, influencing re‐deposition and equilibrium potential.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Appears in the scientific report 2021

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Database coverage:
; ; ; Chemical Reactions ; Clarivate Analytics Master Journal List ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; Index Chemicus ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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