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Design of In-Situ Experimentation for the Study of Fuel Cells with X-rays and Neutrons

Dixon, Ditty and Schroeder, Alexander and Schökel, Alexander and Sohn, Matthias and Manke, Ingo and Kardjilov, Nikolay and Sanders, Tilman and Loos, Volker and Hoogers, Gregor and Wippermann, Klaus and Stolten, Detlef and Roth, Christina (2013):
Design of In-Situ Experimentation for the Study of Fuel Cells with X-rays and Neutrons.
In: MATERIALS TESTING, 52 (10), CARL HANSER VERLAG, MUNICH, GERMANY, pp. 725-735, ISSN 0025-5300,
[Article]

Abstract

In situ neutron and X-ray measurements are of essential importance for the rational design of tailor-made catalysts and cell components, in particular when they can be performed with spatial resolution. Neutron radiography allows the investigation of the local fluid distribution in direct methanol fuel cells (DMFCs) under operating conditions with spatial resolutions in the order of some tens of micrometers. In the through-plane mode, an overview of the local water and gas distribution in the flow field channels is obtained, while the in-plane mode provides information on spatially and time resolved fluid distribution across the cell, hydration/dehydration processes and water distribution across the walls of flow field channels. Combined studies of high resolution neutron radiography and segmented cell measurements are especially valuable, because they enable a correlation of the local fluid distribution and local performance. This knowledge is essential in order to optimise water management and performance and to establish a homogeneous fluid, current and temperature distribution in order to achieve high performance and durability of DMFCs. While the neutron studies focus on the cell components, additional information about the catalyst performance and stability is obtained by in situ X-ray absorption spectroscopy (XAS), thus nicely complementing the neutron measurements. Particle size and particle composition as well as degradation processes by oxidation, de-alloying, and particle growth can be probed with spatial resolution during operation. However, both for neutron and X-ray investigations dedicated cell and experiment design are crucial for the success of the measurements.

Item Type: Article
Erschienen: 2013
Creators: Dixon, Ditty and Schroeder, Alexander and Schökel, Alexander and Sohn, Matthias and Manke, Ingo and Kardjilov, Nikolay and Sanders, Tilman and Loos, Volker and Hoogers, Gregor and Wippermann, Klaus and Stolten, Detlef and Roth, Christina
Title: Design of In-Situ Experimentation for the Study of Fuel Cells with X-rays and Neutrons
Language: English
Abstract:

In situ neutron and X-ray measurements are of essential importance for the rational design of tailor-made catalysts and cell components, in particular when they can be performed with spatial resolution. Neutron radiography allows the investigation of the local fluid distribution in direct methanol fuel cells (DMFCs) under operating conditions with spatial resolutions in the order of some tens of micrometers. In the through-plane mode, an overview of the local water and gas distribution in the flow field channels is obtained, while the in-plane mode provides information on spatially and time resolved fluid distribution across the cell, hydration/dehydration processes and water distribution across the walls of flow field channels. Combined studies of high resolution neutron radiography and segmented cell measurements are especially valuable, because they enable a correlation of the local fluid distribution and local performance. This knowledge is essential in order to optimise water management and performance and to establish a homogeneous fluid, current and temperature distribution in order to achieve high performance and durability of DMFCs. While the neutron studies focus on the cell components, additional information about the catalyst performance and stability is obtained by in situ X-ray absorption spectroscopy (XAS), thus nicely complementing the neutron measurements. Particle size and particle composition as well as degradation processes by oxidation, de-alloying, and particle growth can be probed with spatial resolution during operation. However, both for neutron and X-ray investigations dedicated cell and experiment design are crucial for the success of the measurements.

Journal or Publication Title: MATERIALS TESTING
Volume: 52
Number: 10
Publisher: CARL HANSER VERLAG, MUNICH, GERMANY
Uncontrolled Keywords: local current distribution, Ru anode electrocatalyst, anbsorption spectroscopy, water distribution, catalysts, radiography, PtRu, Co, oxidation, kinetics
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
Date Deposited: 22 Feb 2013 12:30
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