Abstract
A new type of amorphous barium aluminum oxide was synthesized using a polyol thermal method involving a mixture with Vulcan XC-72 carbon and supported with 20%Pt catalysts to enhance the activity of a methanol electrooxidation reaction (MOR). The maximum current density, electrochemically active surface area (ECSA), and electrochemical impedance spectra (EIS) of the obtained catalysts for MOR were determined. The MORs of barium aluminum oxide with different calcination temperatures and Ba and Al contact ratios were studied. The MOR of the uncalcined amorphous Ba0.5AlOx catalysts prepared with a mole ratio of 2/1 Ba/Al mixed with Vulcan XC-72 carbon and supported with 20%Pt catalyst (Pt-Ba0.5AlOx/C) was enhanced compared with that of 20%Pt-Al2O3/C and 20%Pt/C catalysts due to its obtained largest maximum current density of 3.89 mA/cm2 and the largest ECSA of 49.83 m2/g. Therefore, Pt-Ba0.5AlOx/C could provide a new pathway to achieve a sufficient electrical conductivity, and possible synergistic effects with other active components improved the catalytic activity and stability of the prepared catalyst in MOR.
Highlights
In anode, electrocatalysts of direct methanol fuel cells (DMFCs), platinum (Pt) [1], and Pt alloys, such as PtRu [2,3], PtRuCuW [4], PtPd [5], Pt45 Ru45 M10 /C (M = Fe, Co, and Ni) [6], have been used for a methanol electrooxidation reaction (MOR)
Advanced supports with synergistic effects for Pt catalysts should be developed by loading Pt on metal oxide catalysts/C catalysts to improve the carbon monoxide (CO) tolerance, reduce Pt loading, and increase electrochemical durability; some metal oxides that have been studied are CeO2 [8], SnOx [9], TiO2, Al2 O3 [10], and Nb2 O5 [11] because they have a facile oxygen species-releasing ability and good corrosion resistance [11]
The combination of two or more transition metal oxides, which are better than simple individual oxides, can synergistically enhance the catalytic activity of methanol oxidation [11]
Summary
Electrocatalysts of direct methanol fuel cells (DMFCs), platinum (Pt) [1], and Pt alloys, such as PtRu [2,3], PtRuCuW [4], PtPd [5], Pt45 Ru45 M10 /C (M = Fe, Co, and Ni) [6], have been used for a methanol electrooxidation reaction (MOR) These precious metals are poisoned by carbon monoxide (CO) during MOR, causing a rapid decrease in catalytic activities and producing a low power density of DMFCs. anode electrodes need a high loading amount of Pt or Pt alloys to maintain the DMFC performance, but this requirement noticeably increases the cost of a whole fuel cell system.
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