Enhanced performance for proton conducting fuel cells at low temperature

A platinum-cobalt-iron ternary alloy is deposited on a TiO2─ coated multi-walled carbon nanotube support (PtCoFe/MWCNT─TiO2) using a two-step hydrothermal method and evaluated as an anode catalyst for direct methanol fuel cells. Catalysts with different weight ratios of Pt:Co:Fe (3:1:1, 1:1:1 and 1:...

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Bibliographic Details
Published in:Electrochimica acta 2018-11, Vol.290, p.142-149
Main Authors: Konwar, Dimpul, Basumatary, Padmini, Woo, Sung Pil, Lee, Youna, Yoon, Young Soo
Format: Article
Language:English
Subjects:
Acidic oxides
Alloy
Anode catalyst
Anodes
Catalysis
Catalysts
Catalytic activity
Cobalt
Cobalt base alloys
Conductivity
Fuel cells
Iron
Low temperature
Low temperature physics
Maximum power density
Methanol
Multi wall carbon nanotubes
Oxidation
Performance enhancement
Platinum
Power density
Protons
Silver chloride
Single cell
Sulfuric acid
Ternary alloys
Titanium dioxide
Weight
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Summary:A platinum-cobalt-iron ternary alloy is deposited on a TiO2─ coated multi-walled carbon nanotube support (PtCoFe/MWCNT─TiO2) using a two-step hydrothermal method and evaluated as an anode catalyst for direct methanol fuel cells. Catalysts with different weight ratios of Pt:Co:Fe (3:1:1, 1:1:1 and 1:3:3) on MWCNT─TiO2 are prepared and examined. The Pt3Co1Fe1/MWCNT─TiO2 catalyst shows higher catalytic activity and stability compared to the 1:1:1 and 1:3:3 catalysts for the methanol oxidation reaction in acidic media. Cyclic voltammetry analysis shows a maximum mass activity for Pt3Co1Fe1/MWCNT─TiO2 of 4.17 A mg−1Pt (vs. Ag/AgCl) with a low onset potential in 0.4 M H2SO4 and 0.3 M CH3OH solution. A single fuel cell based on Pt3Co1Fe1/MWCNT─TiO2 anode catalyst exhibits a maximum power density of 117.94 mW cm−2 at 50 °C in 1.3 M CH3OH, which is significantly higher than that of the Pt1Co1Fe1/MWCNT─TiO2, Pt1Co3Fe3/MWCNT─TiO2, and Pt/MWCNT catalysts. A study of an advanced PtFeCo/MWCNT-TiO2 anode catalyst for improved electrocatalytic performance towards methanol fuel cell. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.09.064