PtNi supported on binary metal oxides: Potential bifunctional electrocatalysts for low-temperature fuel cells?

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Martins M., Sljukic B., Sequeira C. A. C., Soylu G. S. P., Yurtcan A., Bozkurt G., ...Daha Fazla

APPLIED SURFACE SCIENCE, cilt.428, ss.31-40, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 428
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.apsusc.2017.09.132
  • Dergi Adı: APPLIED SURFACE SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.31-40
  • Anahtar Kelimeler: PtNi nanoparticles, Binary metal oxides, Low-temperature fuel cells, Oxygen reduction reaction, Borohydride oxidation reaction, OXYGEN REDUCTION REACTION, SODIUM-BOROHYDRIDE ELECTROOXIDATION, REDUCED GRAPHENE OXIDE, ALKALINE MEDIA, LOW-COST, OXIDATION, ELECTRODE, NI, PERFORMANCE, CATALYSTS
  • Atatürk Üniversitesi Adresli: Evet

Özet

PtNi nanoparticles (NPs) were synthesised by microwave irradiation technique and supported onto Mn2O3 and two binary metal oxides, Mn2O3-TiO2 and Mn2O3-NiO, prepared by solid-state dispersion method. TEM analysis revealed formation of PtNi NPs of 2-3 nm diameter on the metal oxides. Their activity for oxygen reduction reaction (ORR) and borohydride oxidation reaction (BOR) in alkaline media was studied using voltammetric, amperometric and electrochemical impedance spectroscopy techniques. The effect of electrolyte composition and operation temperature on the catalysts performance was also examined. ORR and BOR kinetic parameters, namely Tafel slope, kinetic current density, order of reaction and activation energy were evaluated, enabling direct comparison of the three electrocatalysts performance. The results show that PtNi NPs anchored on binary metal oxide supports possess superior activity for BOR in alkaline media, suggesting their potential application as anodes in low-temperature fuel cells. (C) 2017 Elsevier B.V. All rights reserved.