Journal
GELS
Volume 8, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/gels8050292
Keywords
trimetallic nanoparticles; hydrogel; urea oxidation; fuel cells
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Funding
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/65]
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In this study, a non-precious NiCoFe trimetallic catalyst supported on porous carbon (NiCoFe@PC) was successfully prepared using gelation and pyrolysis method. The catalyst showed remarkable electrocatalytic activity and low onset potential for urea oxidation in an alkaline medium, outperforming many other transition bimetallic/trimetallic catalysts previously reported.
The fabrication of electrocatalysts with high catalytic activity, high durability and low cost towards urea oxidation by a facile method is a great challenge. In this study, non-precious NiCoFe trimetallic supported on porous carbon (NiCoFe@PC) was prepared via gelation and pyrolysis method, presenting a remarkable electrocatalytic activity with low onset potential for urea oxidation in an alkaline medium. Field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were used to clarify the morphology of the NiCoFe@PC nanostructure and its nanoparticle size of 17.77 nm. The prepared catalyst with the composition ratio of 24.67, 5.92 and 5.11% for Ni, Fe and Co, respectively, with highly crystalline nanoparticles, fixed on porous carbon, according to energy-dispersive X-ray (EDX) and X-ray diffraction (XRD) analysis. The FeCoNi@PC catalyst showed a catalytic activity of 44.65 mA/cm(2) at 0.57 V vs. Ag/AgCl and a low onset potential of 218 mV, which is superior to many other transition bi/trimetallic-based catalysts previously reported.
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