Highly stable urea oxidation electrolysis via Rh nanoparticles residing in the porous LaNiO3 nanocubes

Abstract

Electrocatalytic urea oxidation reaction (UOR) is recognized as an effective approach for the degradation of urea in wastewater into harmless N2 and CO2 due to its low-energy anode reaction. However, there remains a pressing need for an efficient electrocatalyst to enhance the activity and stability of electrolytic urea. In this study, we employed the hydrothermal technique followed by a reduction-impregnation treatment to load the precious metal Rh on the porous LaNiO3 nanocubes. The Rh/LaNiO3-400 °C nanocubes prepared by this method not only retained the porous structure of the LaNiO3 nanocubes but also enhanced the catalytic properties of the precious metal. The synergistic effect between these Rh and LaNiO3 significantly boosted the efficiency of the electrolytic urea process. Characterization tests confirmed that Rh nanoparticles were successfully loaded into the porous LaNiO3 nanocubes, facilitating better interaction between the catalyst and the electrolyte. Electrochemical tests demonstrated that the stability of Rh/LaNiO3-400 °C for up to 72 h. This remarkable stability suggests that such a robust electrocatalyst has the potential to serve as a cornerstone for efficient and long-lasting hydrogen production.