Electrochemical impedance spectroscopy of fully hydrated Nafion membranes at high and low hydrogen partial pressures
Identifieur interne : 006B46 ( Main/Exploration ); précédent : 006B45; suivant : 006B47Electrochemical impedance spectroscopy of fully hydrated Nafion membranes at high and low hydrogen partial pressures
Auteurs : M. N. Tsampas [Grèce] ; S. Brosda [Grèce] ; C. G. Vayenas [Grèce]Source :
- Electrochimica acta [ 0013-4686 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Spectrométrie impédance électrochimique, Hydrogène, Hydrate, Pression partielle, Conductivité protonique, Pile combustible membrane échangeuse proton, Caractéristique courant tension, Régime permanent, Membrane échangeuse cation, Ethylène(tétrafluoro) copolymère, Ionomère, Sulfonate copolymère, Propriété électrique, Nafion.
- Wicri :
- topic : Hydrogène.
English descriptors
- KwdEn :
Abstract
The proton transport mechanism in fully hydrated Nafion 117 membranes was examined via electrochemical impedance spectroscopy (EIS) and steady-state current-potential measurements both in a symmetric H2, Pt|Nafion|Pt, H2 cell and in a H2, Pt|Nafion|Pt, air PEM fuel cell with hydrogen partial pressure values, PH2, varied between 0.5 kPa and 100 kPa. In agreement with recent studies it is found that for low PH2 values the steady-state current-potential curves exhibit bistability and regions of positive slope. In these regions the Nyquist plots are found to exhibit negative real part impedance with a large imaginary component, while the Bode plots show a pronounced negative phase shift. These observations are consistent with the mechanism involving two parallel routes of proton conduction in fully hydrated Nafion membranes, one due to proton migration in the aqueous phase, the other due to proton transfer, probably involving tunneling, between adjacent sulfonate groups in narrow pores. The former mechanism dominates at high PH2 values and the latter dominates in the low PH2 region where the real part of the impedance is negative.
Affiliations:
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N." last="Tsampas">M. N. Tsampas</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical Engineering, University of Patras, Caratheodory 1 St</s1><s2>26504 Patras</s2><s3>GRC</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Grèce</country><wicri:noRegion>26504 Patras</wicri:noRegion></affiliation></author><author><name sortKey="Brosda, S" sort="Brosda, S" uniqKey="Brosda S" first="S." last="Brosda">S. Brosda</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical Engineering, University of Patras, Caratheodory 1 St</s1><s2>26504 Patras</s2><s3>GRC</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Grèce</country><wicri:noRegion>26504 Patras</wicri:noRegion></affiliation></author><author><name sortKey="Vayenas, C G" sort="Vayenas, C G" uniqKey="Vayenas C" first="C. G" last="Vayenas">C. G. Vayenas</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical Engineering, University of Patras, Caratheodory 1 St</s1><s2>26504 Patras</s2><s3>GRC</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Grèce</country><wicri:noRegion>26504 Patras</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Academy of Athens, Panepistimiou 28 Ave.</s1><s2>10679 Athens</s2><s3>GRC</s3><sZ>3 aut.</sZ></inist:fA14><country>Grèce</country><placeName><settlement type="city">Athènes</settlement><region nuts="2" type="region">Attique (région)</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Electrochimica acta</title><title level="j" type="abbreviated">Electrochim. acta</title><idno type="ISSN">0013-4686</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Electrochimica acta</title><title level="j" type="abbreviated">Electrochim. acta</title><idno type="ISSN">0013-4686</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cation exchange membrane</term><term>Electrical properties</term><term>Electrochemical impedance spectroscopy</term><term>Hydrates</term><term>Hydrogen</term><term>Ionomer</term><term>Partial pressure</term><term>Proton conductivity</term><term>Proton exchange membrane fuel cells</term><term>Steady state</term><term>Sulfonate copolymer</term><term>Tetrafluoroethylene copolymer</term><term>Voltage current curve</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Spectrométrie impédance électrochimique</term><term>Hydrogène</term><term>Hydrate</term><term>Pression partielle</term><term>Conductivité protonique</term><term>Pile combustible membrane échangeuse proton</term><term>Caractéristique courant tension</term><term>Régime permanent</term><term>Membrane échangeuse cation</term><term>Ethylène(tétrafluoro) copolymère</term><term>Ionomère</term><term>Sulfonate copolymère</term><term>Propriété électrique</term><term>Nafion</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Hydrogène</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The proton transport mechanism in fully hydrated Nafion 117 membranes was examined via electrochemical impedance spectroscopy (EIS) and steady-state current-potential measurements both in a symmetric H<sub>2</sub>, Pt|Nafion|Pt, H<sub>2</sub> cell and in a H<sub>2</sub>, Pt|Nafion|Pt, air PEM fuel cell with hydrogen partial pressure values, P<sub>H2</sub>, varied between 0.5 kPa and 100 kPa. In agreement with recent studies it is found that for low P<sub>H2</sub> values the steady-state current-potential curves exhibit bistability and regions of positive slope. In these regions the Nyquist plots are found to exhibit negative real part impedance with a large imaginary component, while the Bode plots show a pronounced negative phase shift. These observations are consistent with the mechanism involving two parallel routes of proton conduction in fully hydrated Nafion membranes, one due to proton migration in the aqueous phase, the other due to proton transfer, probably involving tunneling, between adjacent sulfonate groups in narrow pores. The former mechanism dominates at high P<sub>H2</sub> values and the latter dominates in the low P<sub>H2</sub> region where the real part of the impedance is negative.</div></front></TEI><affiliations><list><country><li>Grèce</li></country><region><li>Attique (région)</li></region><settlement><li>Athènes</li></settlement></list><tree><country name="Grèce"><noRegion><name sortKey="Tsampas, M N" sort="Tsampas, M N" uniqKey="Tsampas M" first="M. N." last="Tsampas">M. N. Tsampas</name></noRegion><name sortKey="Brosda, S" sort="Brosda, S" uniqKey="Brosda S" first="S." last="Brosda">S. Brosda</name><name sortKey="Vayenas, C G" sort="Vayenas, C G" uniqKey="Vayenas C" first="C. G" last="Vayenas">C. G. Vayenas</name><name sortKey="Vayenas, C G" sort="Vayenas, C G" uniqKey="Vayenas C" first="C. G" last="Vayenas">C. G. Vayenas</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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