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Title: Asymmetric Nafion-Coated Nanopore Electrode Arrays as Redox-Cycling-Based Electrochemical Diodes

Abstract

Inspired by the functioning of cellular ion channels, pore-based structures with nanoscale openings, have been fabricated and integrated into ionic circuits, e.g. ionic diodes and transistors, for signal processing and detection. In these systems, the nonlinear current responses arise either because asymmetric nanopore geometries break the symmetry of the ion distribution, creating unequal surface charge across the nanopore, or by coupling unidirectional electron transfer within a nanopore electrode. Here, we develop a high-performance redox cycling-based electrochemical diode by coating an asymmetric ion-exchange membrane, i.e. Nafion, on the top surface of a nanopore electrode array (Nafion@NEA), in which each pore in the array exhibits one or more annular electrodes. Nafion@NEAs exhibit highly sensitive and charge-selective electroanalytical measurements due to efficient redox cycling reaction, the permselectivity of Nafion, and strong confinement of redox species in the nanopore array. In addition, the top electrode of dual electrode Nafion@NEAs can serve as a voltage-controlled switch to gate ion transport within the nanopore. Thus, Nafion@NEAs can be operated as a diode by switching voltages applied to the top and bottom electrodes of the NEA, leading to a large rectification ratio, fast response times, and simplified circuitry without the need for external electrodes. Here by takingmore » advantage of closely spaced and individually addressable electrodes, the redox cycling electrochemical diode has the potential for application to large-scale production and electrochemically-controlled circuit operations which go well beyond conventional electronic diodes or transistors.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Notre Dame, Notre Dame, IN (United States)
Publication Date:
Research Org.:
Univ. of Notre Dame, Notre Dame, IN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1494075
Grant/Contract Number:  
FG02-07ER15851
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 12; Journal Issue: 9; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; nanoscale electrochemistry; nanopore electrode arrays; redox cycling; ionic diode; Nafion; permselectivity

Citation Formats

Fu, Kaiyu, Han, Donghoon, Kwon, Seung -Ryong, and Bohn, Paul W. Asymmetric Nafion-Coated Nanopore Electrode Arrays as Redox-Cycling-Based Electrochemical Diodes. United States: N. p., 2018. Web. doi:10.1021/acsnano.8b03751.
Fu, Kaiyu, Han, Donghoon, Kwon, Seung -Ryong, & Bohn, Paul W. Asymmetric Nafion-Coated Nanopore Electrode Arrays as Redox-Cycling-Based Electrochemical Diodes. United States. doi:10.1021/acsnano.8b03751.
Fu, Kaiyu, Han, Donghoon, Kwon, Seung -Ryong, and Bohn, Paul W. Mon . "Asymmetric Nafion-Coated Nanopore Electrode Arrays as Redox-Cycling-Based Electrochemical Diodes". United States. doi:10.1021/acsnano.8b03751. https://www.osti.gov/servlets/purl/1494075.
@article{osti_1494075,
title = {Asymmetric Nafion-Coated Nanopore Electrode Arrays as Redox-Cycling-Based Electrochemical Diodes},
author = {Fu, Kaiyu and Han, Donghoon and Kwon, Seung -Ryong and Bohn, Paul W.},
abstractNote = {Inspired by the functioning of cellular ion channels, pore-based structures with nanoscale openings, have been fabricated and integrated into ionic circuits, e.g. ionic diodes and transistors, for signal processing and detection. In these systems, the nonlinear current responses arise either because asymmetric nanopore geometries break the symmetry of the ion distribution, creating unequal surface charge across the nanopore, or by coupling unidirectional electron transfer within a nanopore electrode. Here, we develop a high-performance redox cycling-based electrochemical diode by coating an asymmetric ion-exchange membrane, i.e. Nafion, on the top surface of a nanopore electrode array (Nafion@NEA), in which each pore in the array exhibits one or more annular electrodes. Nafion@NEAs exhibit highly sensitive and charge-selective electroanalytical measurements due to efficient redox cycling reaction, the permselectivity of Nafion, and strong confinement of redox species in the nanopore array. In addition, the top electrode of dual electrode Nafion@NEAs can serve as a voltage-controlled switch to gate ion transport within the nanopore. Thus, Nafion@NEAs can be operated as a diode by switching voltages applied to the top and bottom electrodes of the NEA, leading to a large rectification ratio, fast response times, and simplified circuitry without the need for external electrodes. Here by taking advantage of closely spaced and individually addressable electrodes, the redox cycling electrochemical diode has the potential for application to large-scale production and electrochemically-controlled circuit operations which go well beyond conventional electronic diodes or transistors.},
doi = {10.1021/acsnano.8b03751},
journal = {ACS Nano},
issn = {1936-0851},
number = 9,
volume = 12,
place = {United States},
year = {2018},
month = {8}
}

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