Stabilisation of Lanthanum Nickelate Electrocatalysts via Ptdoping for High Current Density Rechargeable Zinc-Air Battery

Abstract

Pt-and Pd-doped LaNiO 3 were synthesised by the conventional sol-gel combustion method and tested in Zinc-Air Batteries (ZABs) at high current density of 60 mA cm -2 . We report a 30% enhancement in high-current cycling stability of zinc-air batteries using LaNi 0.95 Pt 0.05 O 3 perovskite electrocatalysts. Through advanced X-ray absorption spectroscopy, we confirm Pt incorporation at the B-site and reveal that Pt 4+ induces structural transformation toward a cubic phase, increases Ni-O ionicity, and enhances La-O covalency. These changes collectively stabilise lattice oxygen participation in OER while preserving bulk structure under 60 mA cm -2 . This work provides mechanistic insight into noble metal doping in perovskites, offering a design strategy for robust bifunctional electrocatalysts.