Effect of the Electric Double Layer on the Activation Energy of Ion Transport in Conical Nanopores
- Univ. of Utah, Salt Lake City, UT (United States)
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
Web of Science
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 |
Similar Records
Surface Charge Density Determination of Single Conical Nanopores Based on Normalized Ion Current Rectification
Quantification of Steady-State Ion Transport through Single Conical Nanopores and a Nonuniform Distribution of Surface Charges