Polyaniline Films as Electrochemical-Proton Pump for Acidification of Thin Layer Samples

Alexander Wiorek; Maria Cuartero; Roland De Marco; Gaston A Crespo

doi:10.1021/acs.analchem.9b03402

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Polyaniline Films as Electrochemical-Proton Pump for Acidification of Thin Layer Samples

Journal article

Open access

Peer reviewed

Polyaniline Films as Electrochemical-Proton Pump for Acidification of Thin Layer Samples

Alexander Wiorek, Maria Cuartero, Roland De Marco and Gaston A Crespo

Analytical Chemistry, Vol.91(23), pp.14951-14959

2019

DOI: https://doi.org/10.1021/acs.analchem.9b03402

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Abstract

Here, we provide the first experimental evidence of proton release from polyaniline (PANI) films subjected to anodic potentials at environmental pHs. We conducted an extensive characterization of unpolarized/polarized PANI films-synthesized by traditional sequential voltammetric scanning-by using spectroelectrochemistry, synchrotron radiation-X-ray photoelectron spectroscopy, near edge X-ray absorption fine structure, and potentiometric pH sensing in the vicinity of the PANI layer. This new insight enables the utilization of PANI as a proton pump, which is actively tuned through an electrochemical pulse, so as to controllably acidify well-confined thin layer samples. Furthermore, we demonstrate the analytical significance of this system by measuring the alkalinity of artificial and natural water samples by using two faced planar PANI electrodes, one working as a proton source and the other one as pH electrode. Finally, the impact of this approach is 2-fold: (i) all-solid-state electrode materials may be used with devisible consequences in miniaturized and implementable submersible probes, and (ii) rapid determination of alkalinity as compared to traditional approaches together with a versatility in pH adjustment in any kind of sample, among other applications.

Details

Title: Polyaniline Films as Electrochemical-Proton Pump for Acidification of Thin Layer Samples
Authors: Alexander Wiorek (Author) - KTH Royal Institute of Technology, Sweden
Maria Cuartero (Author) - KTH Royal Institute of Technology, Sweden
Roland De Marco (Author) - University of the Sunshine Coast
Gaston A Crespo (Author) - KTH Royal Institute of Technology, Sweden
Publication details: Analytical Chemistry, Vol.91(23), pp.14951-14959
Publisher: American Chemical Society
Date published: 2019
DOI: 10.1021/acs.analchem.9b03402
ISSN: 0003-2700
Copyright note: Copyright © 2019 American Chemical Society. This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99450654502621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Analytical