784
Views
32
Crossref
32
WoS
33
Scopus
0
CSCD
The overall energy efficiency of electrochemical systems is severely hindered by the traditional anodic oxygen evolution reaction (OER). Utilizing urea oxidation reaction (UOR) with lower thermodynamic potential to replace OER provides a promising strategy to enhance the energy efficiency. Amorphous and heterojunctions electrocatalysts have been aroused extensive studies owing to their unique physicochemical properties and outperformed activity. Herein, we report a simple method to construct a novel crystalline–amorphous NiO-CrOx heterojunction grown on Ni foam for UOR electrocatalyst. The NiO-CrOx electrocatalyst displays excellent UOR performance with an ultralow working potential of 1.32 V at 10 mA·cm−2 and ultra-long stability about 5 days even at 100 mA·cm−2. In-situ Raman analysis and temperature-programmed desorption (TPD) measurement verify that the presence of the amorphous CrOx phase can boost the reconstruction from NiO to active NiOOH species and enhance adsorption ability of urea molecule. Besides, the unique crystalline–amorphous interfaces are also benefit to improving the UOR performance.
This work was financially supported by the National Natural Science Foundation of China (Nos. 52025013 and 22121005), the 111 Project (No. B12015), Haihe Laboratory of Sustainable Chemical Transformations, and the Fundamental Research Funds for the Central Universities.