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    Electrosynthesized polypyrrole/zeolite composites as solid contact in potassium ion-selective electrode

    Year: 2017

    Journal: Electrochim. Acta, Volume 228, FEB 20, page 66–75

    Authors: Yu, Kai; He, Ning; Kumar, Narendra; Wang, NianXing; Bobacka, Johan; Ivaska, Ari

    Organizations: Magnus Ehrnrooth Foundation

    Keywords: Polypyrrole/zeolite; ZSM-5; Electrochemical synthesis; Solid contact; Potassium ion sensor

    Polypyrrole/zeolite composites were studied as solid contact material in potassium ion-selective electrodes (K+-ISEs). Proton-exchanged Zeolite Socony Mobil-5 (H-ZSM-5) with SiO2/Al2O3 ratios of 23, 80 and 280 were electrochemically synthesized with polypyrrole (PPy). The anionic groups on the zeolite framework functioned as the counter ions for PPy during the reaction. H-ZSM-5 particles were observed on the surface as well as inside the composite films. PPy/H-ZSM-5 composites gave a similar cyclic voltammogram as PPy doped with chloride, PPy(Cl-). The hydrophobicity of the composites decreased in the order PPy/H-ZSM-523 > PPy/H-ZSM-580 > PPy/H-ZSM-5-280. The redox capacitance of the composite was better utilized than that of PPy(Cl-) after they were coated with a plasticized PVC membrane. PPy/H-ZSM-5 composite-based K+-ISEs exhibited similar potential stability as the PPy(Cl-)-based K+-ISE. However, when compared with the PPy(Cl-)-based K+-ISE, the detection limit of PPy/H-ZSM-5 composite-based K+-ISEs was enhanced after a long-term conditioning. (C) 2017 Elsevier Ltd. All rights reserved.
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