Affiliation:
1. Grupo de Materiales Avanzados para la Producción y Almacenamiento de Energía Universidad Politécnica de Cartagena Aulario II, Campus de Alfonso XIII 30203 Cartagena Spain
2. Departamento de Química Física y Termodinámica Aplicada Instituto Químico para la Energía y el Medioambiente Universidad de Córdoba E-14014 Córdoba Spain
Abstract
AbstractHerein, we have developed LaMnO3 (LMO) perovskite‐based electrocatalysts of oxygen reduction and oxygen evolution reactions (ORR and OER) in a basic aqueous solution. Mechanochemical grinding and thermal annealing leads to highly‐pure perovskites as shown by X‐ray diffraction. This methodology also allows doping the LMO perovskite with RuO2, thus improving its catalytic activity, especially the oxygen evolution reaction. ORR have been analyzed by rotating ring‐disk electrode (RRDE). Eventually, these catalysts are employed in Zn/air batteries resulting in specific capacity values of 12.76 Ahg−1 at 1 Ag−1, when LMO‐RuO2 (LMO−Ru) was used as catalyst in the positive electrodes. Besides, high operational stability of Zn/air batteries for over 100 cycles was obtained, saving 1.46 mWh per cycle when LMO−Ru was used with respect to pure LMO.