No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.
Communication: Nanoscale ion fluctuations in Nafion polymer electrolyte
6. P. Choi, N. Jalani, and R. Datta, “Thermodynamics and proton transport in Nafion – III. Proton transport in Nafion/sulfated ZrO2 nanocomposite membranes,” J. Electrochem. Soc. 152(8), A1548–A1554 (2005).
9. K. Schmidt-Rohr and Q. Chen, “Parallel cylindrical water nanochannels in Nafion fuel-cell membranes,” Nat. Mater. 7(1), 75–83 (2008);
9.M. Bass, A. Berman, A. Singh, O. Konovalov, and V. Freger, “Surface-induced micelle orientation in Nafion films,” Macromolecules 44(8), 2893–2899 (2011).
10. L. Rubatat, A. Rollet, G. Gebel, and O. Diat, “Evidence of elongated polymeric aggregates in Nafion,” Macromolecules 35(10), 4050–4055 (2002).
11. J. Dura, V. Murthi, M. Hartman, S. Satija, and C. Majkrzak, “Multilamellar interface structures in Nafion,” Macromolecules 42(13), 4769–4774 (2009).
12. M. Bass, A. Berman, A. Singh, O. Konovalov, and V. Freger, “Surface structure of Nafion in vapor and liquid,” J. Phys. Chem. B 114(11), 3784–3790 (2010).
13. V. Murthi, J. Dura, S. Satija, C. Majkrzak, T. Fuller, K. Shinohara, V. Ramani, P. Shirvanian, H. Uchida, S. Cleghorn, M. Inaba, S. Mitsushima, P. Strasser, H. Nakagawa, H. Gasteiger, T. Zawodzinski, and C. Lamy, “Water uptake and interfacial structural changes of thin film Nafion® membranes measured by neutron reflectivity for PEM fuel cells,” ECS Transactions 16(2), 1471–1485 (2008).
15. E. Aleksandrova, R. Hiesgen, K. Friedrich, and E. Roduner, “Electrochemical atomic force microscopy study of proton conductivity in a Nafion membrane,” Phys. Chem. Chem. Phys. 9(21), 2735–2743 (2007).
16. R. Hiesgen, E. Aleksandrova, G. Meichsner, I. Wehl, E. Roduner, and K. Friedrich, “High-resolution imaging of ion conductivity of Nafion (R) membranes with electrochemical atomic force microscopy,” Electrochim. Acta 55(2), 423–429 (2009).
18. H. Oukris and N. Israeloff, “Nanoscale non-equilibrium dynamics and the fluctuation-dissipation relation in an ageing polymer glass,” Nature Phys. 6(2), 135–138 (2010).
19. N. Hoepker, S. Lekkala, R. Loring, and J. Marohn, “Dielectric fluctuations over polymer films detected using an atomic force microscope,” J. Phys. Chem. B 115(49), 14493–14500 (2011).
20. S. Lekkala, N. Hoepker, J. Marohn, and R. Loring, “Charge carrier dynamics and interactions in electric force microscopy,” J. Chem. Phys. 137(12), 124701 (2012).
21. S. Lekkala, J. A. Marohn, and R. F. Loring, “Electric force microscopy of semiconductors: Theory of cantilever frequency fluctuations and noncontact friction,” J. Chem. Phys. 139(18), 184702 (2013).
22. Z. Lu, G. Polizos, D. Macdonald, and E. Manias, “State of water in perfluorosulfonic ionomer (Nafion 117) proton exchange membranes,” J. Electrochem. Soc. 155(2), B163–B171 (2008).
23. G. Gomila, J. Toset, and L. Fumagalli, “Nanoscale capacitance microscopy of thin dielectric films,” J. Appl. Phys, 104(2), 024315 (2008).
24. P. Restle, M. Weissman, and R. Black, “Tests of gaussian statistical properties of 1/F noise,” J. Appl. Phys. 54(10), 5844–5847 (1983).
29. P. Crider, M. Majewski, J. Zhang, H. Oukris, and N. Israeloff, “Local dielectric spectroscopy of polymer films,” Appl. Phys. Lett. 91(1), 013102 (2007).
30. C. Riedel, R. Sweeney, N. Israeloff, R. Arinero, G. Schwartz, A. Alegria, P. Tordjeman, and J. Colmenero, “Imaging dielectric relaxation in nanostructured polymers by frequency modulation electrostatic force microscopy,” Appl. Phys. Lett. 96(21), 213110 (2010);
30.H. Nguyen, D. Prevosto, M. Labardi, S. Capaccioli, M. Lucchesi, and P. Rolla, “Effect of confinement on structural relaxation in ultrathin polymer films investigated by local dielectric spectroscopy,” Macromolecules 44(16), 6588–6593 (2011).
Article metrics loading...
Ion conduction mechanisms and the nanostructure of ion conduction networks remain poorly understood in polymer electrolytes which are used as proton-exchange-membranes (PEM) in fuel cell applications. Here we study nanoscale surface-potential fluctuations produced by Brownian ion dynamics in thin films of low-hydration Nafion™, the prototype PEM. Images and power spectra of the fluctuations are used to derive the local conductivity-relaxation spectrum, in order to compare with bulk behavior and hopping-conductivity models. Conductivity relaxation-times ranged from hours to milliseconds, depending on hydration and temperature, demonstrating that the observed fluctuations are produced by water-facilitated hydrogen-ion hopping within the ion-channel network. Due to the small number of ions probed, non-Gaussian statistics of the fluctuations can be used to constrain ion conduction parameters and mechanisms.
Full text loading...
Most read this month