Boosting oxygen electrode kinetics by addition of cost-effective transition metals (Ni, Fe, Cu) to platinum on graphene nanoplatelets

Mladenović D., Daş E., Santos D. M., Bayrakçeken Yurtcan A., Miljanić Š., Šljukić B.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.905, ss.164156-164167, 2022 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 905
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.jallcom.2022.164156
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Public Affairs Index, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.164156-164167
  • Atatürk Üniversitesi Adresli: Evet

Özet

Pt and Pt-M (M = Ni, Fe, Cu) nanoparticles supported on graphene nanoplatelets (GNPs) were synthesized

by simultaneous supercritical carbon dioxide deposition method. Morphology analysis by TEM revealed the

formation of metal nanoparticles of 2–3 nm size uniformly distributed over GNPs, while XPS was used to

determine their oxidation states. Four materials were tested as electrocatalysts for ORR and OER in unitized

regenerative fuel cells and rechargeable metal-air batteries. PtFe/GNPs exhibited favorable ORR kinetics in

terms of the highest diffusion-limited current density, the lowest Tafel slope, and a high number of ex-

changed electrons (n = 3.66), which might be attributed to its high double-layer capacitance and, thus, high

electrochemically active surface area. Furthermore, this material performance was comparable to that of

commercial Pt/C electrocatalyst containing double the amount of Pt. The same material showed the best

performance toward OER as evidenced by the highest current density, the lowest value of exchange current

density, and overpotential to reach a current density of 10 mA cm-2, as well as the lowest Tafel slope.