Platinum on nitrogen-doped Mn2O3–NiO as a bifunctional electrocatalyst for air cathodes
Journal of Physics and Chemistry of Solids, cilt.199, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 199
- Basım Tarihi: 2025
- Doi Numarası: 10.1016/j.jpcs.2025.112575
- Dergi Adı: Journal of Physics and Chemistry of Solids
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Metadex
- Anahtar Kelimeler: Air cathode, Nitrogen-doping, Oxygen evolution reaction, Oxygen reduction reaction, Platinum, Transition metal oxides
- Atatürk Üniversitesi Adresli: Evet
Özet
Designing and developing oxygen electrode bifunctional electrocatalysts to be used in rechargeable metal-air batteries is crucial for their efficient operation. Herein, Mn2O3–NiO is synthesised by two different co-precipitation and solid-state reaction methods, and nitrogen is doped into these binary oxides. Subsequently, platinum (Pt) is grafted onto the binary oxide supports, undoped and N-doped, and materials’ structure, texture, surface morphology, and elemental composition/state are examined using XRD, N2-sorption, TEM, and XPS analysis, respectively. The as-prepared materials were further examined for bifunctional catalysis of oxygen reduction/evolution reactions (ORR/OER). The best-performing Pt/N–Mn2O3–NiO (S1) electrocatalyst showed Tafel slope values of 77 and 219 mV dec−1 for ORR and OER, respectively, a number of electrons exchanged during ORR of 3.61 and a diffusion-limited current density of −4.86 mA cm−2, and finally, the lowest ΔE of 0.92 V. Demonstrated catalytic activity along with the high stability observed during the accelerated stress test make Pt/N–Mn2O3–NiO a promising bifunctional ORR/OER electrocatalyst for rechargeable metal-air batteries.