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Characteristics and performance of urea modified Pt-MWCNTs for electro-oxidation of methanol

Nouralishahi, Amideddin, Mortazavi, Yadollah, Khodadadi, Abbas Ali, Choolaei, Mohammadmehdi, Thompson, Levi T. and Amini Horri, Bahman (2019) Characteristics and performance of urea modified Pt-MWCNTs for electro-oxidation of methanol Applied Surface Science, 467-8. pp. 335-344.

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Characteristics and performance of urea modified Pt-MWCNTs for electro-oxidation of methanol.doc - Accepted version Manuscript

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Abstract

Multiwall carbon nanotubes are modified by urea (MWCNTs-U), as an amide group, through a simple amination method to be used as support for Pt nanoparticles in methanol electrooxidation reaction (MOR). The amination method involves a covalent grafting of urea molecules onto the surface of acid treated multiwall carbon nanotubes (MWCNTs-A) using O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU) as the coupling agent. Platinum nanoparticles are impregnated on the surface of MWCNTs-U using NaBH4. Pt/MWCNTs-U shows an enhanced electrocatalytic activity and durability with exposing larger accessible surface area and 27% higher active surface area compared to Pt/MWCNTs-A. In addition, urea incorporation can improve the electrocatalyst tolerance against CO-poisoning, due to the enhanced formation kinetics of the chemisorbed hydroxyl groups. The onset potential of COads oxidation indicates a decrease from 553 mV to 530 mV for Pt/MWCNTs-A and Pt/MWCNTs-U, respectively. It is observed that in the presence of amide group the forward peak current density and exchange current density, in CV and LSV experiments, respectively increase from 378 to 515 mA/mgPt and 1.59 × 10−8 A/cm2 to 2.12 × 10−8 A/cm2. These results are also in a good agreement with the theoretical activation energies obtained from Arrhenius plots, indicating a decrease from 41.7 to 38.8 kJ/mol methanol in the case of Pt/MWCNTs-A and Pt/MWCNTs-U, respectively.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Nouralishahi, Amideddin
Mortazavi, Yadollah
Khodadadi, Abbas Ali
Choolaei, Mohammadmehdim.choolaei@surrey.ac.uk
Thompson, Levi T.
Amini Horri, Bahmanb.aminihorri@surrey.ac.uk
Date : 15 February 2019
DOI : 10.1016/j.apsusc.2018.10.126
Copyright Disclaimer : © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Methanol oxidation reaction; Platinum; Carbon nanotube; Urea; Amine functional group
Depositing User : Clive Harris
Date Deposited : 05 Feb 2019 16:20
Last Modified : 21 Oct 2019 10:48
URI: http://epubs.surrey.ac.uk/id/eprint/850370

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