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Electrosynthesized polypyrrolezeolite composites as solid contact in potassium ion-selective electrode.pdf

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Electrosynthesized polypyrrolezeolite composites as solid contact in potassium ion-selective electrode.pdf

Electrochimica Acta 228 (2017) 66–75 Contents lists available at ScienceDirect Electrochimica Acta journal homepage: /locate/electacta Electrosynthesized polypyrrole/zeolite composites as solid contact in potassium ion-selective electrode Kai Yua,*, Ning Hea, Narendra Kumara, NianXing Wangb, Johan Bobackaa, Ari Ivaskaa a Johan Gadolin Process Chemistry Centre, ?bo Akademi University, Biskopsgatan 8, 20500, ?bo/Turku, Finland b Laboratory of Materials Chemistry and Chemical Analysis, University of Turku, Vatselankatu 2, 20014, ?bo/Turku, Finland ARTICLE INFO Article history: Received 26 September 2016 Received in revised form 2 January 2017 Accepted 2 January 2017 Available online 4 January 2017 Keywords: Polypyrrole/zeolite ZSM-5 Electrochemical synthesis Solid contact Potassium ion sensor ABSTRACT 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 ?lms. PPy/H-ZSM-5 composites gave a similar cyclic voltammogram as PPy doped with chloride, PPy(Clà). The hydrophobicity of the composites decreased in the order PPy/H-ZSM-5–23 PPy/H-ZSM-5–80 PPy/H-ZSM-5-280. The redox capacitance of the composite was better utilized than that of PPy(Clà) after they were coated with a plasticized PVC membrane. PPy/H-ZSM-5 composite-based K+-ISEs exhibited similar potential stability as the PPy(Clà)based K+-ISE. However, when compared with the PPy(Clà)-based K+-ISE, the detection limit of PPy/HZSM-5 composite-based K+-ISEs was enhanced after a long-term conditioning. ? 2017 Elsevier Ltd. All rights reserved. 1. Introduction Both liquid contact and solid contact (SC) based ion-selective electrod