El-Deab, Mohamed S. (2010) Electrocatalysis by nanoparticles: Oxidation of formic acid at manganese oxide nanorods-modified Pt planar and nanohole-arrays. Journal of Advanced Research, 1 (1). 87 - 93.
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Official URL: http://www.sciencedirect.com/science/article/B9HCY...
The electro-oxidation of formic acid (an essential reaction in direct formic acid fuel cells) is a challenging process because of the deactivation of anodes by the adsorption of the poisoning intermediate carbon monoxide (CO). Pt electrodes in two geometries (planar and nanohole-array) were modified by the electrodeposition of manganese oxide nanorods (nano-MnOx). The modified Pt electrodes were then tested for their electrocatalytic activity through the electro-oxidation of formic acid in a solution of pH 3.45. Two oxidation peaks ( and ) were observed at 0.2 and 0.55 V, respectively; these were assigned to the direct and indirect oxidative pathways. A significant enhancement of the direct oxidation of formic acid to CO2 was observed at the modified electrodes, while the formation of the poisoning intermediate CO was suppressed. increases with surface coverage (θ) of nano-MnOx with a concurrent depression of . An increase in the ratio /ν1/2 with decreasing potential scan rate (ν) indicates that the oxidation process proceeds via a catalytic mechanism. The modification of Pt anodes with manganese oxide nanorods results in a significant improvement of the electrocatalytic activity along with a higher tolerance to CO. Thus nano-MnOx plays a crucial role as a catalytic mediator which facilitates the charge transfer during the direct oxidation of formic acid to CO2.
|Uncontrolled Keywords:||Nanostructures; Nanohole-arrays; Manganese oxide nanorods; Modified surfaces; Electrocatalysis|
|Subjects:||Material Science > Nanostructured materials|
|Deposited On:||22 Apr 2010 10:37|
|Last Modified:||22 Apr 2010 10:37|
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