History-dependent ion transport through conical nanopipettes and the implications in energy conversion dynamics at nanoscale interfaces
Abstract
The dynamics of ion transport at nanostructured substrate–solution interfaces play vital roles in high-density energy conversion, stochastic chemical sensing and biosensing, membrane separation, nanofluidics and fundamental nanoelectrochemistry. Advancements in these applications require a fundamental understanding of ion transport at nanoscale interfaces. The understanding of the dynamic or transient transport, and the key physical process involved, is limited, which contrasts sharply with widely studied steady-state ion transport features at atomic and nanometer scale interfaces. Here we report striking time-dependent ion transport characteristics at nanoscale interfaces in current–potential (I–V) measurements and theoretical analyses. First, a unique non-zero I–V cross-point and pinched I–V curves are established as signatures to characterize the dynamics of ion transport through individual conical nanopipettes. Moreoever, ion transport against a concentration gradient is regulated by applied and surface electrical fields. The concept of ion pumping or separation is demonstrated via the selective ion transport against concentration gradients through individual nanopipettes. Third, this dynamic ion transport process under a predefined salinity gradient is discussed in the context of nanoscale energy conversion in supercapacitor type charging–discharging, as well as chemical and electrical energy conversion. Our analysis of the emerging current–potential features establishes the urgently needed physical foundation for energy conversion employingmore »
- Authors:
-
- Georgia State Univ., Atlanta, GA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1265884
- Grant/Contract Number:
- AC05-00OR22725; 1059022
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Chemical Science
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2041-6520
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Li, Yan, Wang, Dengchao, Kvetny, Maksim M., Brown, Warren, Liu, Juan, and Wang, Gangli. History-dependent ion transport through conical nanopipettes and the implications in energy conversion dynamics at nanoscale interfaces. United States: N. p., 2014.
Web. doi:10.1039/C4SC02195A.
Li, Yan, Wang, Dengchao, Kvetny, Maksim M., Brown, Warren, Liu, Juan, & Wang, Gangli. History-dependent ion transport through conical nanopipettes and the implications in energy conversion dynamics at nanoscale interfaces. United States. https://doi.org/10.1039/C4SC02195A
Li, Yan, Wang, Dengchao, Kvetny, Maksim M., Brown, Warren, Liu, Juan, and Wang, Gangli. 2014.
"History-dependent ion transport through conical nanopipettes and the implications in energy conversion dynamics at nanoscale interfaces". United States. https://doi.org/10.1039/C4SC02195A. https://www.osti.gov/servlets/purl/1265884.
@article{osti_1265884,
title = {History-dependent ion transport through conical nanopipettes and the implications in energy conversion dynamics at nanoscale interfaces},
author = {Li, Yan and Wang, Dengchao and Kvetny, Maksim M. and Brown, Warren and Liu, Juan and Wang, Gangli},
abstractNote = {The dynamics of ion transport at nanostructured substrate–solution interfaces play vital roles in high-density energy conversion, stochastic chemical sensing and biosensing, membrane separation, nanofluidics and fundamental nanoelectrochemistry. Advancements in these applications require a fundamental understanding of ion transport at nanoscale interfaces. The understanding of the dynamic or transient transport, and the key physical process involved, is limited, which contrasts sharply with widely studied steady-state ion transport features at atomic and nanometer scale interfaces. Here we report striking time-dependent ion transport characteristics at nanoscale interfaces in current–potential (I–V) measurements and theoretical analyses. First, a unique non-zero I–V cross-point and pinched I–V curves are established as signatures to characterize the dynamics of ion transport through individual conical nanopipettes. Moreoever, ion transport against a concentration gradient is regulated by applied and surface electrical fields. The concept of ion pumping or separation is demonstrated via the selective ion transport against concentration gradients through individual nanopipettes. Third, this dynamic ion transport process under a predefined salinity gradient is discussed in the context of nanoscale energy conversion in supercapacitor type charging–discharging, as well as chemical and electrical energy conversion. Our analysis of the emerging current–potential features establishes the urgently needed physical foundation for energy conversion employing ordered nanostructures. The elucidated mechanism and established methodology can be generalized into broadly-defined nanoporous materials and devices for improved energy, separation and sensing applications.},
doi = {10.1039/C4SC02195A},
url = {https://www.osti.gov/biblio/1265884},
journal = {Chemical Science},
issn = {2041-6520},
number = 1,
volume = 6,
place = {United States},
year = {Wed Aug 20 00:00:00 EDT 2014},
month = {Wed Aug 20 00:00:00 EDT 2014}
}
Web of Science
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Works referencing / citing this record:
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