Deep Eutectic Solvent-based Synthesis of Fe and Ag Electrocatalysts for the Oxygen Reduction Reaction

Güneş S., Şahin A., Aytaç A., Güldür F. Ç., Tapan N. A.

10th International Hydrogen Technologies Congress (IHTEC-10), İstanbul, Türkiye, 10 - 13 Mayıs 2026, ss.1-4, (Tam Metin Bildiri)

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: İstanbul
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.1-4
  • Gazi Üniversitesi Adresli: Evet

Özet

In this study, carbon supported Ag and Fe electrocatalysts were synthesized in a deep eutectic solvent (DES) medium consisting of choline chloride and urea (1:2). The method included preparation of a mixture of DES, metal precursors and carbon black support, which was then subjected to pyrolysis for the removal of the solvent and calcination of metals. The X-ray diffraction results showed that the iron phases were mainly composed of metallic Fe and different oxides including Fe3O4 and Fe2O3, while the silver phases were mainly composed of metallic Ag. The nitrogen adsorption analysis revealed that the catalysts had microporous structures, owing to the carbon black support. The highest BET highest surface areas were obtained as 683 and 647 m2/g for Fe/C and Ag/C, respectively. While both Ag and Fe-based catalysts were observed to be active towards oxygen reduction, those high in Ag content exhibited higher current densities and more positive peak potentials. Results show that the DES-mediated synthesis is a promising approach for developing active ORR catalysts using low cost, non-platinum metals.