Amorphous/crystalline heterostructure of NiFe (oxy)hydroxides for efficient oxygen evolution and urea oxidation
Tianshan Song1, Hui Xue1, Jing Sun1
1College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China. qinwang@imu.edu.cn.
Chemical Communications (Cambridge, England)
|March 29, 2023
Summary
Vanadium-doped nickel-iron (oxy)hydroxide nanoflowers show excellent oxygen evolution and urea oxidation reaction activities. Doping optimizes the electronic structure, enhancing catalytic performance for energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Nickel-iron (oxy)hydroxides are promising electrocatalysts for oxygen evolution reaction (OER) and urea oxidation reaction (UOR).
- Developing efficient and stable catalysts is crucial for electrochemical energy conversion technologies.
Purpose of the Study:
- To synthesize and characterize a V-doped amorphous/crystalline heterostructure of NiFe (oxy)hydroxide with nanoflower morphology.
- To investigate the impact of V doping on the catalytic performance for OER and UOR.
Main Methods:
- Synthesis of V-doped NiFe (oxy)hydroxide nanoflowers via a facile method.
- Characterization using techniques like X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS).
- Electrochemical evaluation of OER and UOR activities using techniques such as cyclic voltammetry (CV) and chronoamperometry (CA).
Main Results:
- The V-doped NiFe (oxy)hydroxide exhibited excellent catalytic activity for both OER and UOR.
- V doping was found to alter the local charge density and optimize the electronic structure of the NiFe LDH catalyst.
- The amorphous/crystalline heterostructure and nanoflower morphology contributed to enhanced catalytic performance.
Conclusions:
- V doping is an effective strategy to enhance the electrocatalytic activity of NiFe (oxy)hydroxides for OER and UOR.
- The developed V-doped catalyst demonstrates potential for application in electrochemical energy conversion systems.
- Understanding the electronic and structural modifications induced by doping provides insights for designing advanced catalysts.
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