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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Azevedo, Nuno Monteiro |
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Kær, Søren Knudsen
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Topics
Publications (12/12 displayed)
- 2019Hydrogen mass transport resistance changes in a high temperature polymer membrane fuel cell as a function of current density and acid dopingcitations
- 2019Hydrogen mass transport resistance changes in a high temperature polymer membrane fuel cell as a function of current density and acid dopingcitations
- 2019The influence of ferric ion impurities on a proton exchange membrane electrolyzer operated at varying temperature and current density conditions
- 2019Influence of the operation mode on PEM water electrolysis degradationcitations
- 2019Influence of the operation mode on PEM water electrolysis degradationcitations
- 2019Long-term contamination effect of iron ions on cell performance degradation of proton exchange membrane water electrolysercitations
- 2018The Influence of Phosphoric Acid Migration on the Performance of High Temperature Polymer Electrolyte Fuel Cellscitations
- 2017Analysing Gas-Liquid Flow in PEM Electrolyser Micro-Channels Using a Micro-Porous Ceramic as Gas Permeable Wallcitations
- 2017Analysing Gas-Liquid Flow in PEM Electrolyser Micro-Channels Using a Micro-Porous Ceramic as Gas Permeable Wallcitations
- 2011Modelling multiphase flow inside the porous media of a polymer electrolyte membrane fuel cell
- 2010Thin film thermocouples for in situ membrane electrode assembly temperature measurements in a polybenzimidazole-based high temperature proton exchange membrane unit cellcitations
- 2010Thin film thermocouples for in situ membrane electrode assembly temperature measurements in a polybenzimidazole-based high temperature proton exchange membrane unit cellcitations
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article
Hydrogen mass transport resistance changes in a high temperature polymer membrane fuel cell as a function of current density and acid doping
Abstract
High temperature polymer electrolyte membrane fuel cells (HT-PEMFC) have phosphoric acid doped membranes. Acid in the membrane is mobile and tends to move out of the membrane depending on the acid doping. The migration of acid (when the doping is high) towards the anode at high current density >0.4Acm−2 causes gas diffusion layer (GDL) and catalyst flooding which thereby results higher hydrogen transport resistance. Thus, it is important to determine the acid doping level, which is optimal. In this study, transient changes in hydrogen mass transport is investigated as a function of doping level and current density. Three doping levels 11, 8.3 and 7 molecules of H2PO4 per PBI repeat unit are investigated. Electrochemical impedance spectroscopy (EIS) was modified to a single frequency measurement and time constant are calculated for resistance change with current density using a linear fit. The time constants are 2.0 ± 0.5, 3.4 ± 0.3, 8.2 ± 0.2 min for low and 2.5 ± 0.8, 4.9 ± 0.3 and 4.5 ± 0.2 min for high current densities, for the respective doping levels. The resistance decreases at high and increases at low current densities for all the doping levels with a varying time constant. This change in time constant is attributed to low doping level having lower capillary pressure to push the acid from reaching GDL pores from the membrane and/or catalyst layer.