کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1786555 | 1023418 | 2012 | 6 صفحه PDF | دانلود رایگان |

Carbon nanofiber (CNF) network supported Pt and Pt–Ni alloy nano particle catalysts were prepared by electrochemical deposition at different deposition cycles. Structure, composition and surface morphology of the Pt/CNF and Pt–Ni/CNF were analyzed using X-ray diffraction, Energy dispersive X-ray spectroscopy and field emission scanning electron microscopy. Structural analysis by XRD revealed a face centered cubic crystal structure for Pt and its alloy. SEM images have shown that the Pt–Ni nanoparticles distributed evenly on the CNF network. The electrocatalytic activity of the Pt/CNF and Pt–Ni/CNF electrodes was verified using an electrochemical linear voltammetrty (ELV), cyclic voltammetry (ECV) and electrochemical impedance spectroscopy (EIS) in an alkaline solution containing 1 M C2H5OH + 1 M KOH. The results show increased catalytic activity with enhancement of the Pt–Ni alloy formation.
► Pt and Pt–Ni nanoparticles were electrochemically deposited on CNF network at various cycle numbers such as 40, 60 and 80 as catalyst for direct ethanol fuel cells.
► The Pt–Ni80/CNF catalyst electrode prepared at a sweep time of 80 showed a highest electroactivity for the ethanol electro-oxidation.
► This is because of the increased Ni to Pt atomic ratio and the decrease in particle size with the increase of deposition cycle number.
Journal: Current Applied Physics - Volume 12, Issue 3, May 2012, Pages 854–859