Polyaniline prepared by Fe3O4 catalysed eco-friendly synthesis as electrocatalyst for efficient water electrolysis

Original scientific paper

Authors

  • Jadranka Milikić University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158, Belgrade, Serbia https://orcid.org/0000-0003-2266-6738
  • Jana Mišurović University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158, Belgrade, Serbia - now at University of Montenegro, Faculty of Metallurgy and Technology, Cetinjski put, bb, 81000 Podgorica, Montenegro https://orcid.org/0000-0003-3907-9169
  • Lazar Rakočević University of Belgrade, “VINČA” Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Mike Petrovića Alasa 12-14, 11000, Belgrade, Serbia https://orcid.org/0000-0001-6199-8087
  • Igor A. Pašti University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158, Belgrade, Serbia https://orcid.org/0000-0002-1000-9784
  • Gordana Ćirić-Marjanović University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158, Belgrade, Serbia https://orcid.org/0000-0002-1050-7003
  • Biljana Šljukić University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158, Belgrade, Serbia https://orcid.org/0000-0003-0203-4012

DOI:

https://doi.org/10.5599/jese.2438

Keywords:

Hydrogen evolution reaction, oxygen evolution reaction, conducting polymers, transition metal oxides, electrocatalysis

Abstract

Preparing cost-effective and highly active catalysts for electrocatalytic hydrogen evolution reaction is crucial for developing hydrogen-based technologies. Hence, four conductive polyanilines, prepared by the environmentally-friendly approach using Fe3O4 nanoparticles/H2O2 as the catalyst/main oxidant system (PANI/Fe3O4), were investi¬gated for the first time as electrocatalysts for hydrogen evolution reaction (HER) in acidic media (0.1 M H2SO4) by using voltammetry and chronoamperometry. PANI/Fe3O4 electrodes exhibited Tafel slope values in the -171 to -246 mV dec-1 range depending on the synthesis conditions ‒ Fe3O4/aniline mass ratio and polymerization time. The sample PANI/Fe3O4-II(3) prepared with shorter reaction time and higher Fe3O4/aniline mass ratio showed the best electrocatalytic behaviour reflected in the lowest onset potential (-0.286 V), the lowest overpotential to reach a current density of -10 mA cm-2, the highest current density, the lowest HER activation energy (10 kJ mol-1), and the lowest charge-transfer resistance (5.3 Ω) under HER conditions. Materials were characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray photo¬electron spectroscopy and electrochemical impedance spectroscopy, and differences in their electrocatalytic HER performance were explained by differences in their content of Fe3O4, surface and electrical properties. Moreover, the possibility of using PANI/Fe3O4-II(3) as HER electrocatalyst in a wider range of pH (i.e. in alkaline media as well) and as a bifunc¬tional electrocatalyst, i.e. for oxygen evolution reaction beside HER, was also examined.

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30-10-2024 — Updated on 30-10-2024

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Vol. 15 No. 1 (2025)

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Physical electrochemistry

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Polyaniline prepared by Fe3O4 catalysed eco-friendly synthesis as electrocatalyst for efficient water electrolysis : Original scientific paper. (2024). Journal of Electrochemical Science and Engineering, 15(1), Article 2438. https://doi.org/10.5599/jese.2438

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