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@article{1757240,
author = {Trnková, Libuše and Třísková, Iveta and Čechal, Jan and Farka, Zdeněk},
article_number = {May},
doi = {http://dx.doi.org/10.1016/j.elecom.2021.107018},
keywords = {Polymer pencil graphite electrode; Nanocomposite; Microporous electrodes; Siloxanes; Redox processes in chlorides},
language = {eng},
issn = {1388-2481},
journal = {Electrochemistry Communications},
title = {Polymer pencil leads as a porous nanocomposite graphite material for electrochemical applications: The impact of chemical and thermal treatments},
url = {https://www.sciencedirect.com/science/article/pii/S1388248121001028},
volume = {126},
year = {2021}
}
TY - JOUR
ID - 1757240
AU - Trnková, Libuše - Třísková, Iveta - Čechal, Jan - Farka, Zdeněk
PY - 2021
TI - Polymer pencil leads as a porous nanocomposite graphite material for electrochemical applications: The impact of chemical and thermal treatments
JF - Electrochemistry Communications
VL - 126
IS - May
SP - "107018"
EP - "107018"
PB - Elsevier Inc.
SN - 13882481
KW - Polymer pencil graphite electrode
KW - Nanocomposite
KW - Microporous electrodes
KW - Siloxanes
KW - Redox processes in chlorides
UR - https://www.sciencedirect.com/science/article/pii/S1388248121001028
N2 - Pencil graphite electrodes are a simple, disposable, and low-cost alternative to screen-printed graphite electrodes. In terms of stability and sensitivity, pencil electrodes often outperform conventional carbon ones. This paper discusses and emphasizes the superior properties of polymer pencil graphite electrodes (pPeGEs), which can be exploited in the electrochemical analysis of molecules, such as chlorides, whose signals are missing on common graphite electrodes. The chemical and structural behaviour of pencil leads after exposure to acids (HF, HNO3, HClO4) or organic solvents (CH3CN, CH3Cl) was monitored via X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The electrochemical activity of pristine and treated pPeGEs was studied by the cyclic voltammetry (CV) responses of reversible redox probes [Fe(CN)6]3-/4- and [Ru(NH3)6]3+/2+. XPS proved the presence of siloxanes in the surface matrix of the pencil leads; this finding relates to the hydrophobic surface character of the electrodes. SEM then provided images of the pencil surfaces with microplates and flakes and revealed the removal of siloxanes upon chemical treatment. The CVs of non-dried and dried pPeGEs displayed surface changes in the polymer matrix, accompanied by water loss. Our study shows that the pPeGE retains the character of a stable graphite sensor when exposed to acids and organic solvents, except for HF and chloroform. The discovered effects explain the electrochemical processes occurring on pPeGEs and can contribute to their application in electrochemical sensing and energy storage.
ER -
TRNKOVÁ, Libuše, Iveta TŘÍSKOVÁ, Jan ČECHAL and Zdeněk FARKA. Polymer pencil leads as a porous nanocomposite graphite material for electrochemical applications: The impact of chemical and thermal treatments. \textit{Electrochemistry Communications}. Elsevier Inc., 2021, vol.~126, May, p.~''107018'', 7 pp. ISSN~1388-2481. Available from: https://dx.doi.org/10.1016/j.elecom.2021.107018.
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