Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-8991
Main Title: In Operando Neutron Radiography Analysis of a High-Temperature Polymer Electrolyte Fuel Cell Based on a Phosphoric Acid-Doped Polybenzimidazole Membrane Using the Hydrogen-Deuterium Contrast Method
Author(s): Lin, Yu
Arlt, Tobias
Kardjilov, Nikolay
Manke, Ingo
Lehnert, Werner
Type: Article
Language Code: en
Abstract: In order to characterize high temperature polymer electrolyte fuel cells (HT-PEFCs) in operando, neutron radiography imaging, in combination with the deuterium contrast method, was used to analyze the hydrogen distribution and proton exchange processes in operando. These measurements were then combined with the electrochemical impedance spectroscopy measurements. The cell was operated under different current densities and stoichiometries. Neutron images of the active area of the cell were captured in order to study the changeover times when the fuel supply was switched between hydrogen and deuterium, as well as to analyze the cell during steady state conditions. This work demonstrates that the changeover from proton to deuteron (and vice versa) leads to local varying media distributions in the electrolyte, independent of the overall exchange dynamics. A faster proton-to-deuteron exchange was re-discovered when switching the gas supply from H2 to D2 than that from D2 to H2. Furthermore, the D2 uptake and discharge were faster at a higher current density. Specifically, the changeover from H to D takes 5–6 min at 200 mA cm−2, 2–3 min at 400 mA cm−2 and 1–2 min at 600 mA cm−2. An effect on the transmittance changes is apparent when the stoichiometry changes.
URI: https://depositonce.tu-berlin.de/handle/11303/10000
http://dx.doi.org/10.14279/depositonce-8991
Issue Date: 24-Aug-2018
Date Available: 11-Sep-2019
DDC Class: 530 Physik
620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): neutron radiography
operando
polymer electrolyte fuel cell
phosphoric acid doped polybenzimidazole membrane
hydrogen-deuterium contrast method
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Energies
Publisher: MDPI
Publisher Place: Basel
Volume: 11
Issue: 9
Article Number: 2214
Publisher DOI: 10.3390/en11092214
EISSN: 1996-1073
Appears in Collections:FG Struktur und Eigenschaften von Materialien » Publications

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