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Electrochemical study of screen-printed electrodes modified with electropolymerized polyaniline films grafted with low mass ratio of graphene oxide

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Abstract

Homemade screen-printed electrodes (SPEs) were produced using conductive inks with graphite and alkyd resin and were modified with electropolymerized films of polyaniline (PAni) grafted with 2.5 and 5.0 (m:m) of graphene oxide (GO) obtained by the chemical oxidation of graphite. The SPEs were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The CV results showed similar redox behavior for all SPE, characteristic of PAni films in an acidic medium (0.5 mol L−1 H2SO4). However, the EIS results showed a decrease in the charge-transfer resistance (Rct), from 1064 Ω for SPE/PAni to 364 Ω for SPE/PAni-2.5%GO (about 3 times) and to 113 Ω for SPE/PAni-5%GO (about 10 times) compared to the unmodified counterpart SPE/PAni. Additionally, an increase in the constant phase element (CPE2) value was also observed, from 459 µS sα cm−2 for SPE/PAni to 838 µS sα cm−2 for SPE/PAni-2.5%GO and to 1560 µS sα cm−2 for SPE/PAni-5%GO, indicating lower ion transport for the SPEs modified with the PAni-GO hybrids. This method to produce a homemade SPE modified with the PAni-GO hybrid with improved electrochemical behavior and ionic conductivity is a simple, low-cost, scalable, and interesting alternative for future applications in sensors or charge-storage electrochemical devices.

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Funding

The authors thank the São Paulo Research Foundation (FAPESP 2021/0804-4 and 2017/24742-7) for providing financial and technical support to this project, CAPES and CNPQ. We also thank Fundação para a Ciência e a Tecnologia (FCT), Portugal, CEMMPRE, project UIDB/00285/2020, and ARISE, project LA/P/0112/2020, with FEDER funds through the program COMPETE—Programa Operacional Factores de Competitividade and national funds through FCT.

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  1. Graduate Program in Chemistry: Sustainability Science and Technology, Federal University of São Paulo, Diadema, Brazil

    Gabriela M. de Araújo, Milton A. Cardoso & José H. S. Carnaúba

  2. Department of Chemistry, CEMMPRE, ARISE, Faculty of Sciences and Technology, University of Coimbra, 3004-535, Coimbra, Portugal

    Christopher M. A. Brett

  3. Institute of Marine Sciences, Federal University of São Paulo, Santos, Brazil

    Fábio R. Simões

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de Araújo, G.M., Cardoso, M.A., Carnaúba, J.H.S. et al. Electrochemical study of screen-printed electrodes modified with electropolymerized polyaniline films grafted with low mass ratio of graphene oxide. J Solid State Electrochem (2024). https://doi.org/10.1007/s10008-024-05981-9

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