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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, vol.199, 2025 (SCI-Expanded, Scopus)
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 coprecipitation 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 Delta E 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.