Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Electrochemical Performance Improvement of the Catalyst of the Methanol Micro-Fuel Cell Using Carbon Nanotubes

Version 1 : Received: 2 May 2019 / Approved: 6 May 2019 / Online: 6 May 2019 (10:05:30 CEST)
Version 2 : Received: 27 December 2019 / Approved: 29 December 2019 / Online: 29 December 2019 (07:06:08 CET)

How to cite: Kazemi Nasrabadi, M.; Ebrahimi-Moghadam, A.; Ahmadi, M.H.; Kumar, R.; Nabipour, N. Electrochemical Performance Improvement of the Catalyst of the Methanol Micro-Fuel Cell Using Carbon Nanotubes. Preprints 2019, 2019050045 (doi: 10.20944/preprints201905.0045.v2). Kazemi Nasrabadi, M.; Ebrahimi-Moghadam, A.; Ahmadi, M.H.; Kumar, R.; Nabipour, N. Electrochemical Performance Improvement of the Catalyst of the Methanol Micro-Fuel Cell Using Carbon Nanotubes. Preprints 2019, 2019050045 (doi: 10.20944/preprints201905.0045.v2).

Abstract

Due to low working temperature, high energy density and low pollution, proton exchange fuel cells have been investigated under different operating conditions in different applications. Using platinum catalysts in methanol fuel cells leads to increasing the cost of this kind of fuel cell which is considered as a barrier to the commercialism of this technology. For this reason, a lot of efforts have been made to reduce the loading of the catalyst required on different supports. In this study, carbon black (CB) and carbon nanotubes (CNT) have been used as catalyst supports of the fuel cell as well as using the double-metal combination of platinum-ruthenium (PtRu) as anode electrode catalyst and platinum (Pt) as cathode electrode catalyst. The performance of these two types of electro-catalyst in the oxidation reaction of methanol has been compared based on electrochemical tests. Results showed that the carbon nanotubes increase the performance of the micro-fuel cell by 37% at maximum power density, compared to the carbon black. Based on thee-electrode tests of chronoamperometry and voltammetry, it was found that the oxidation onset potential of methanol for CNT has been around 20% less than CB, leading to the kinetic improvement of the oxidation reaction. The current density of methanol oxidation reaction increased up to 62% in CNT sample compared to CB supported one, therefore the active electrochemical surface area of the catalyst has been increased up to 90% by using CNT compared to CB which shows the significant rise of the electrocatalytic activity in CNT supported catalyst. Moreover, the resistance of the CNT supported sample to poisonous intermediate species has been found 3% more than CB supported one. According to the chronoamperometry test results, it was concluded that the performance and sustainability of the CNT electro-catalyst show remarkable improvement compared to CB electro-catalyst in the long term.

Subject Areas

fuel cell; carbon nanotube; catalyst; platinum-ruthenium

Comments (1)

Comment 1
Received: 29 December 2019
Commenter: Mohammad Hosein Ahmadi
Commenter's Conflict of Interests: Author
Comment: Authorship and reference citation format updated
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