TY - JOUR ID - 20916 TI - The effect of amine functionalized carbon nanotubes as promising support for platinum nanoparticles on oxygen reduction reaction JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Yadegari, Amir AU - Nouralishahi, Amideddin AU - Mortazavi, Yadollah AU - Khodadadi, Abbas Ali AU - Rashidi, Alimorad AD - Catalysis and Nanostructured Materials Research Laboratory, School of Chemical Engineering, University of Tehran, P.O. Box 11155/4563 Tehran, Iran AD - Research Institute of Petroleum Industry (RIPI), Azadi sport complex West Blvd., Tehran, Iran Y1 - 2018 PY - 2018 VL - 25 IS - 6 SP - 3354 EP - 3367 KW - amine functional groups KW - electrocatalysts KW - carbon nanotubes KW - oxygen reduction reaction KW - Pt nanoparticles DO - 10.24200/sci.2018.20916 N2 - In this study, multiwall carbon nanotubes (MWCNTs) were chemically oxidized (OMWCNTs) and functionalized with ethylenediamine (EDAMWCNTs) and diethylenetriamine (DETAMWCNTs) as amine precursors. The electrocatalysts were prepared through deposition of Pt nanoparticles on the functionalized MWCNTs by polyol method. The average size of Pt nanoparticles was found to lie between 4 and 5 nm. Cyclic Voltammetry (CV), Rotating Disk Electrode (RDE), Electrochemical Impedance Spectroscopy (EIS), and Chronoamperometry (CA) were employed to evaluate the electrochemical properties of the electrocatalysts. The Electrochemical active surface area (EASA), number of electron transferred (n), and onset potential for EDAMWCNTs and DETAMWCNTs were found to be about 32.2 and 45.8 (m2/g Pt), 4.03 and 4.10 (electron per oxygen molecule), and 0.986 and 0.997 (V vs RHE), respectively. However, in the case of Pt-OMWCNTs the above mentioned electrochemical characteristics were calculated to be 24.2 (m2/g Pt), 3.34 (electron per oxygen molecule), and 0.824 (V vs RHE), respectively. Moreover, EIS and CA indicate that introducing amine functional groups lead to less electron transfer resistance and better electrocatalytic activity and stability during oxygen reduction. The results show that the higher number of nitrogen atoms within the amine functional groups the more enhanced electrocatalytic performance of Pt nanoparticles in ORR. UR - https://scientiairanica.sharif.edu/article_20916.html L1 - https://scientiairanica.sharif.edu/article_20916_78858160e99be5277a7dbb4e5e346824.pdf ER -