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Title: Effect of the Electric Double Layer on the Activation Energy of Ion Transport in Conical Nanopores

Journal Article · · Journal of Physical Chemistry. C

Measured apparent activation energies, $$E_A$$, of ion transport (K+ and Cl) in conical glass nanopores are reported as a function of applied voltage (-0.5 to 0.5 V), pore size (20–2000 nm), and electrolyte concentration (0.1–50 mM). $$E_A$$ values for transport within an electrically charged conical glass nanopore differ from the bulk values due to the voltage and temperature-dependent distribution of the ions within the double layer. Remarkably, nanopores that display ion current rectification also display a large decrease in $$E_A$$ under accumulation mode conditions (at applied negative voltages versus an external ground) and a large increase in $$E_A$$ under depletion mode conditions (at positive voltages). Finite element simulations based on the Poisson–Nernst–Planck model semiquantitatively predict the measured temperature-dependent conductivity and dependence of $$E_A$$ on applied voltage. The results highlight the relationships between the distribution of ions with the nanopore, ionic current, and $$E_A$$ and their dependencies on pore size, temperature, ion concentration, and applied voltage.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Nanostructures for Electrical Energy Storage (NEES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001160
OSTI ID:
1386251
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 43; Related Information: NEES partners with University of Maryland (lead); University of California, Irvine; University of Florida; Los Alamos National Laboratory; Sandia National Laboratories; Yale University; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (4)

Investigation of Ionic Transport Through Track-Etched Conical Nanopores of PET Membrane journal January 2018
Bioinspired smart asymmetric nanochannel membranes journal January 2018
Enhanced Stability and Controllability of an Ionic Diode Based on Funnel-Shaped Nanochannels with an Extended Critical Region journal March 2016
Origin of the Shape of Current-Voltage Curve through Nanopores: A Molecular Dynamics Study journal May 2016