Experimental study to distinguish the effects of methanol slip and water vapour on a high temperature PEM fuel cell at different operating conditions

Sobi Thomas*, Jakob Rabjerg Vang, Samuel Simon Araya, Søren Knudsen Kær

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review

12 Citations (Scopus)
25 Downloads (Pure)

Abstract

The objective of this paper is to separate out the effects of methanol and water vapour on a high temperature polymer electrolyte membrane fuel cell under different temperatures (160°C and 180°C) and current densities (0.2Acm-2, 0.4Acm-2 and 0.6Acm-2). The degradation rates at the different current densities and temperatures are analysed and discussed. The results are supported by IV curves and impedance spectroscopy. The individual resistance variations are extracted by equivalent circuit model fitting of the impedance spectra. The presence of water in the anode feed enhances the performance while the presence of 5% methanol tends to degrade the cell performance. However, the presence of H2O mitigates some of the adverse effects of methanol. The effect of varying fuel compositions was found to be more prominent at lower current densities. The voltage improves significantly when adding water vapour to the anode after pure hydrogen operation at 180°C. A decrease in the total resistance corresponding to the voltage improvement is observed from the impedance spectra. There is minimal variation in performance with the introduction of 3% and 5% methanol along with water vapour in the anode feed at all current densities and operating temperatures. The overall degradation over a period of 1915h is -44μVh-1. The test time includes 595h of test with pure H2 and 300h test each with 15% H2O, 3% CH3OH+15% H2O and 5% CH3OH+15% H2O at varying current densities and temperatures.
Original languageEnglish
JournalApplied Energy
Volume192
Pages (from-to)422–436
Number of pages15
ISSN0306-2619
DOIs
Publication statusPublished - Apr 2017

Fingerprint

fuel cell
density current
Water vapor
methanol
Fuel cells
water vapor
Methanol
Current density
experimental study
Anodes
temperature
Temperature
degradation
Degradation
electrolyte
Electric potential
Proton exchange membrane fuel cells (PEMFC)
polymer
Equivalent circuits
spectroscopy

Keywords

  • Equivalent circuit model
  • HT-PEMFC
  • Impedance
  • Reformed methanol

Cite this

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title = "Experimental study to distinguish the effects of methanol slip and water vapour on a high temperature PEM fuel cell at different operating conditions",
abstract = "The objective of this paper is to separate out the effects of methanol and water vapour on a high temperature polymer electrolyte membrane fuel cell under different temperatures (160°C and 180°C) and current densities (0.2Acm-2, 0.4Acm-2 and 0.6Acm-2). The degradation rates at the different current densities and temperatures are analysed and discussed. The results are supported by IV curves and impedance spectroscopy. The individual resistance variations are extracted by equivalent circuit model fitting of the impedance spectra. The presence of water in the anode feed enhances the performance while the presence of 5{\%} methanol tends to degrade the cell performance. However, the presence of H2O mitigates some of the adverse effects of methanol. The effect of varying fuel compositions was found to be more prominent at lower current densities. The voltage improves significantly when adding water vapour to the anode after pure hydrogen operation at 180°C. A decrease in the total resistance corresponding to the voltage improvement is observed from the impedance spectra. There is minimal variation in performance with the introduction of 3{\%} and 5{\%} methanol along with water vapour in the anode feed at all current densities and operating temperatures. The overall degradation over a period of 1915h is -44μVh-1. The test time includes 595h of test with pure H2 and 300h test each with 15{\%} H2O, 3{\%} CH3OH+15{\%} H2O and 5{\%} CH3OH+15{\%} H2O at varying current densities and temperatures.",
keywords = "Equivalent circuit model, HT-PEMFC, Impedance, Reformed methanol",
author = "Sobi Thomas and Vang, {Jakob Rabjerg} and Araya, {Samuel Simon} and K{\ae}r, {S{\o}ren Knudsen}",
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Experimental study to distinguish the effects of methanol slip and water vapour on a high temperature PEM fuel cell at different operating conditions. / Thomas, Sobi; Vang, Jakob Rabjerg; Araya, Samuel Simon; Kær, Søren Knudsen.

In: Applied Energy, Vol. 192, 04.2017, p. 422–436.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Experimental study to distinguish the effects of methanol slip and water vapour on a high temperature PEM fuel cell at different operating conditions

AU - Thomas, Sobi

AU - Vang, Jakob Rabjerg

AU - Araya, Samuel Simon

AU - Kær, Søren Knudsen

PY - 2017/4

Y1 - 2017/4

N2 - The objective of this paper is to separate out the effects of methanol and water vapour on a high temperature polymer electrolyte membrane fuel cell under different temperatures (160°C and 180°C) and current densities (0.2Acm-2, 0.4Acm-2 and 0.6Acm-2). The degradation rates at the different current densities and temperatures are analysed and discussed. The results are supported by IV curves and impedance spectroscopy. The individual resistance variations are extracted by equivalent circuit model fitting of the impedance spectra. The presence of water in the anode feed enhances the performance while the presence of 5% methanol tends to degrade the cell performance. However, the presence of H2O mitigates some of the adverse effects of methanol. The effect of varying fuel compositions was found to be more prominent at lower current densities. The voltage improves significantly when adding water vapour to the anode after pure hydrogen operation at 180°C. A decrease in the total resistance corresponding to the voltage improvement is observed from the impedance spectra. There is minimal variation in performance with the introduction of 3% and 5% methanol along with water vapour in the anode feed at all current densities and operating temperatures. The overall degradation over a period of 1915h is -44μVh-1. The test time includes 595h of test with pure H2 and 300h test each with 15% H2O, 3% CH3OH+15% H2O and 5% CH3OH+15% H2O at varying current densities and temperatures.

AB - The objective of this paper is to separate out the effects of methanol and water vapour on a high temperature polymer electrolyte membrane fuel cell under different temperatures (160°C and 180°C) and current densities (0.2Acm-2, 0.4Acm-2 and 0.6Acm-2). The degradation rates at the different current densities and temperatures are analysed and discussed. The results are supported by IV curves and impedance spectroscopy. The individual resistance variations are extracted by equivalent circuit model fitting of the impedance spectra. The presence of water in the anode feed enhances the performance while the presence of 5% methanol tends to degrade the cell performance. However, the presence of H2O mitigates some of the adverse effects of methanol. The effect of varying fuel compositions was found to be more prominent at lower current densities. The voltage improves significantly when adding water vapour to the anode after pure hydrogen operation at 180°C. A decrease in the total resistance corresponding to the voltage improvement is observed from the impedance spectra. There is minimal variation in performance with the introduction of 3% and 5% methanol along with water vapour in the anode feed at all current densities and operating temperatures. The overall degradation over a period of 1915h is -44μVh-1. The test time includes 595h of test with pure H2 and 300h test each with 15% H2O, 3% CH3OH+15% H2O and 5% CH3OH+15% H2O at varying current densities and temperatures.

KW - Equivalent circuit model

KW - HT-PEMFC

KW - Impedance

KW - Reformed methanol

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DO - 10.1016/j.apenergy.2016.11.063

M3 - Journal article

AN - SCOPUS:85009165631

VL - 192

SP - 422

EP - 436

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

ER -