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Structure, Properties, and Degradation of Nanothin Ionomer Films in Fuel Cell Catalytic Layers

Handl, Michael and Morawietz, Tobias and Devproshad, K. Paul and Friedrich, Kaspar Andreas and Karan, Kunal and Hiesgen, Renate (2018) Structure, Properties, and Degradation of Nanothin Ionomer Films in Fuel Cell Catalytic Layers. ECS Transactions, 85 (13), pp. 889-903. Electrochemical Society, Inc.. DOI: 10.1149/08513.0889ecst ISSN 1938-5862

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Abstract

The structure of electrodes for proton-exchange membrane fuel cells and electrolysis has a major impact on performance and degradation. Ionomer films covering Pt/C agglomerates in fuel cell electrodes have a thickness in the range of 4 to 15 nm. Such nanothin ionomer films differ significantly in structure and conductivity from bulk ionomer. To access their thicknessstructure-conductivity correlations, self-assembled model layers deposited on platinum-covered Si were investigated by materialsensitive and conductive AFM at conditions close to operation. The dependence of transient current on ionomer film height measured directly at samples with a varying thickness has two distinct changes of slope which indicates three distinct length scales (< 4-5 nm, ~ 4-8 nm, > 8 nm) over which structure and subsequently the conductivity of nanothin films varies.

Item URL in elib:https://elib.dlr.de/124475/
Document Type:Article
Title:Structure, Properties, and Degradation of Nanothin Ionomer Films in Fuel Cell Catalytic Layers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Handl, MichaelHochschule EsslingenUNSPECIFIED
Morawietz, TobiasHochschule EsslingenUNSPECIFIED
Devproshad, K. PaulUniversity of AlbertaUNSPECIFIED
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deUNSPECIFIED
Karan, KunalUniversity of AlbertaUNSPECIFIED
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Date:July 2018
Journal or Publication Title:ECS Transactions
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:85
DOI :10.1149/08513.0889ecst
Page Range:pp. 889-903
Publisher:Electrochemical Society, Inc.
ISSN:1938-5862
Status:Published
Keywords:Thin film, ionomer, microstructure, conductivity
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:19 Dec 2018 16:37
Last Modified:06 Sep 2019 15:24

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