Platinum on nitrogen-doped Mn2O3-NiO as a bifunctional electrocatalyst for air cathodes
Mladenovic, Ana, Aykut, Yasemin, Mladenovic, Dusan, Santos, Diogo M. F., Bayrakceken, Ayse, Soylu, Gulin S. P., Sljukic, Biljana
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.
- Journal
- JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
- Year
- 2025
- Volume
- 199
- ISSN
- 0022-3697
- eISSN
- 1879-2553
- DOI
- 10.1016/j.jpcs.2025.112575
- WoS UID
- WOS:001407403600001