Abstract
Urea production through an electro-synthetic approach emerges as a sustainable alternative compared to its conventional energy-intensive and polluting technologies. However, the advancement of the aforementioned technique is primarily impeded by existing inefficient electrocatalysts. Therefore, the rational design of the indispensable catalyst along with the unveiling of the reaction pathway through intermediate identification, would enable the utmost deployment of the proposed strategy. Herein, we prepared a non-noble layered perovskite NdBa0.25Sr0.75Co2O5+ δ using the citric acid-metal nitrate combustion method and utilized it as an electrocatalyst alongside CO2 and nitrite contaminants used as input sources for urea synthesis. The synthesized electrocatalyst proffered remarkable electrochemical performance for the above-stated urea electrosynthesis reaction with a yield rate of 6.66 µmol g−1 h−1 and Faradaic efficiency (F.E) of 9.5%, respectively, at − 1.04 V vs RHE optimized conditions. High-performance liquid chromatography analysis was performed for end-product quantification. The favourable urea formation could be attributable to the unique distribution of prevailing oxygen vacancies in the perovskite cathode material. The insights provided in the article unravel a novel paradigm for the use of layered perovskite materials in urea electrosynthesis.
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