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Issue 26, 2016
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Dynamic mechanoelectrochemistry of polypyrrole membranes via shear-force tracking

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Abstract

Mechanoelectrochemistry is the study of elastic and plastic deformation of materials during reversible reduction and oxidation processes. In this article, we introduce shear-force tracking as a method to dynamically measure mechanical (strain), chemical (ion transport), and electrical (applied redox potentials) responses of the conducting polymer polypyrrole (PPy) during redox reactions. This tracking technique uses a control algorithm to maintain a set distance between a ultramicroelectrode (UME) tip and a surface via shear-force regulation. Due to the sensitivity of shear-force signals in the near field of substrate surfaces, a significantly improved signal to noise ratio (20 : 1) is possible and allows for nanoscale measurement of redox events. Chemomechanical coupling (the ratio of ion transport to resultant extensional actuation) is calculated for PPy-based membranes of various thicknesses based on a mechanistic interpretation of charge storage in redox active conducting polymers. The measured dynamic response demonstrates that chemomechanical coupling is not a constant, as assumed in literature, but is dependent on the polymers state of charge and the direction (ingress/egress) of ion transport.

Graphical abstract: Dynamic mechanoelectrochemistry of polypyrrole membranes via shear-force tracking

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Publication details

The article was received on 06 May 2016, accepted on 24 May 2016 and first published on 01 Jun 2016


Article type: Paper
DOI: 10.1039/C6CP03071H
Phys. Chem. Chem. Phys., 2016,18, 17366-17372

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    Dynamic mechanoelectrochemistry of polypyrrole membranes via shear-force tracking

    R. G. Northcutt, C. Heinemann and V. B. Sundaresan, Phys. Chem. Chem. Phys., 2016, 18, 17366
    DOI: 10.1039/C6CP03071H

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