Influence of bimetallic nanoparticles composition and synthesis temperature on the electrocatalytic activity of NiMn-incorporated carbon nanofibers toward urea oxidation
الملخص
High efficiency, cost effectivity and the availability of hydrogen are the advantages of
electrolysis as a strategy for urea-containing wastewater treatment. Composition,
morphology, and synthesis-temperature distinctly affect the performance of the functional
electro-catalysts. NiMn-incorporated carbon nanofibers are introduced as effective electrocatalysts
for urea oxidation process. Studying the influence of the metallic nanoparticles
composition indicated that the nanofibers obtained from an electro-spun solution containing
10 wt% manganese acetate reveal the best performance in terms of both of onset
potential and current density. Typically, the nanofibers obtained from electros-pun solutions
having 0, 5, 10 and 15 wt% manganese acetate showed 540, 495, 430 and 510 mV (vs.
RHE) and 56, 32, 79 and 29 mA/cm2 onset potentials and current densities, respectively at
calcination temperature of 850 C and 2 M urea solution. On the other hand, due to the
impact on the crystallinity and final morphology, change in calcination temperature reflects
the observable influence on the catalyst performance. At 2 M urea solution, the
detected onset potentials and current densities were 590, 470, 430 and 440 mV, and 5, 22, 79
and 69 mA/cm2 for the nanofibers calcined at 550, 700, 850 and 1000 C, respectively.
Accordingly, these results indicated that the synthesis temperature must be maintained at
850 C. Overall, the study emphasizes the importance of optimizing the bimetallic electrocatalysts
composition and synthesis temperature. Moreover, it was detected that the
carbon nanofibers prepared from poly(vinyl alcohol) reveal high electric conductivity
compared to the commercial nanofibers obtained from the expensive polyacrylonitrile
polymer.
معرّف المصادر الموحد
http://www.sciencedirect.com/science/article/pii/S0360319918303069المجموعات
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