A dual-doping strategy of LaCoO₃ for optimized oxygen evolution reaction toward zinc-air batteries application

Perovskite-based electrocatalysts are extensively investigated as a replacement for noble metals electrocatalysts for energy storage and conversion devices. Their interesting catalytic activity, low cost, and diversity are considered major advantages. In this work, a facile dual-doping strategy has been conducted and yielded an astonishing upgrade of lanthanum cobaltite; fine-tuning of both A and B sites with calcium and manganese has proven remarkably beneficial. The dual-doping modulates the electronic configuration of both transition metals and raises the oxygen vacancies. Consequently, oxygen evolution reaction has been assessed and La_0.8Ca_0.2Mn_0.2Co_0.8O₃ showed significantly improved overpotential and maximal current density in comparison with pristine LaCoO₃. Furthermore, the ZAB exhibited a high open circuit potential and superior charge-discharge cyclability, compared to Pt/C-based electrodes. The current work explores the influence of simultaneous doping of the A and B sites in lanthanum perovskite oxides on electrocatalytic performance to encourage further exploration of such an approach in electrocatalysis. Novelty statement: Simultaneous Ca and Mn dual-doping of LaCoO₃ in the A and B sites were successfully applied. The effects on the crystal structure, oxidation states, and electrocatalytic activity were studied. LCMC8228-based ZAB has achieved a large discharge capacity of 88.1 mAh in comparison to the benchmark.