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The growing demand for ammonia (NH₃) as a carbon-free fuel and hydrogen carrier for decarbonization has increased interest in its synthesis under mild conditions to cope with the intermittent renewable supply of electricity and green hydrogen. Developing active and cost-efficient catalysts is crucial for achieving this goal. Herein, we investigated Ba and Ce incorporated Co (Ba/CoCe) as an efficient catalyst for ammonia synthesis. Our findings show that the optimal amount of Ba and Ce incorporation onto Co resulted in a drastic increase in catalytic activity compared to both pure Co and Ba or Ce singly promoted Co catalysts. Moreover, it exhibits superior catalytic performance and cost efficiency when compared to state-of-the-art benchmark catalysts. Co-incorporation of Ba and Ce forms BaCeO₃ perovskite during catalyst preparation. Co–BaCeO₃ interface bears a moderate adsorption strength of nitrogen …