NiO-Fe2O3 based graphene aerogel as urea electrooxidation catalyst

A NiO-Fe2O3 based graphene aerogel was employed as a novel catalyst material for the electrochemical oxidation of urea. The three-dimensional aerogels were synthesized by metal ions (Ni2+ and Fe3+)-induced self-assembly using poly(vinyl alcohol) (PVA) as the structural scaffold. The NiO-Fe2O3/rGO/PV...

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Bibliographic Details
Published in:Electrochimica acta 2017-05, Vol.237, p.171-176
Main Authors: Das, Gautam, Tesfaye, Robel Mehari, Won, Yusun, Yoon, Hyon Hee
Format: Article
Language:English
Subjects:
Aerogel
Aerogels
Anodizing
Catalysts
Chemical synthesis
Conductivity
Current density
Electrocatalysis
Electrocatalyst
Electrochemical oxidation
Electrodes
Graphene
Hematite
Iron oxides
Oxidation
Photoelectron spectroscopy
Reduced graphene oxide
Scanning electron microscopy
Self assembly
Urea oxidation
Ureas
Voltammetry
X-ray diffraction
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Summary:A NiO-Fe2O3 based graphene aerogel was employed as a novel catalyst material for the electrochemical oxidation of urea. The three-dimensional aerogels were synthesized by metal ions (Ni2+ and Fe3+)-induced self-assembly using poly(vinyl alcohol) (PVA) as the structural scaffold. The NiO-Fe2O3/rGO/PVA aerogels were characterized by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The catalytic performance of the aerogels for urea electrooxidation in an alkaline medium was investigated by cyclic voltammetry. The NiO-Fe2O3/rGO/PVA aerogel electrode exhibited significant reduction of the onset oxidation potential (∼90mV) compared to that of NiO/rGO/PVA. The NiO-Fe2O3/rGO/PVA aerogel electrode showed a peak current density of 44.6mAcm−2 at 0.33M urea in 1.0M KOH, which was 2.6-fold higher than that of NiO/rGO/PVA electrode. Moreover, the NiO-Fe2O3/rGO/PVA electrode showed only a 11% loss in the peak current after 200th cycles.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.03.197