Crystalline—amorphous interfaces of NiO-CrOx electrocatalysts for boosting the urea oxidation reaction

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...

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Bibliographic Details
Published in:Nano research 2023-03, Vol.16 (3), p.3665-3671
Main Authors: Cao, Xuejie, Wang, Tongzhou, Qin, Hongye, Lin, Guangliang, Zhao, Lihua, Jiao, Lifang
Format: Article
Language:English
Subjects:
Anodizing
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Electrocatalysts
Electrochemistry
Energy efficiency
Heterojunctions
Interfaces
Materials Science
Metal foams
Nanotechnology
Nickel oxides
Oxidation
Oxygen evolution reactions
Physicochemical properties
Raman spectroscopy
Research Article
Urea
Ureas
Women’s special issue in nanomaterials
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Summary: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-CrO x heterojunction grown on Ni foam for UOR electrocatalyst. The NiO-CrO x 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 CrO x 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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-022-4635-5