Electrocatalytic oxidation of methanol on Pt-Pd nanoparticles supported on honeycomb-like porous carbons in alkaline media |
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Authors: | Yong Liu Shenshen Li Yunmao Zhang Weihua Liu Jianhong Wang Cuiping Zhai |
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Affiliation: | 1.Henan Key Laboratory of Polyoxometalate, Institute of Fine Chemistry and Engineering, College of Chemistry and Chemical Engineering,Henan University,Kaifeng,People’s Republic of China |
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Abstract: | Honeycomb-like porous carbons (PCs) were synthesized using a facile self-assembly method with phenolic resin as the carbon source and tetraethyl orthosilicate (TEOS) as the silica source. The PCs were found to have a large BET surface area of 458 m2 g?1 and a partially graphitized structure. The obtained PCs were used as a support for various Pt-Pd bimetallic alloy catalysts employed for methanol oxidation in alkaline media. Compared with Pt supported on commercial Vulcan XC-72R carbon (Pt/C) and with the other Pt-Pd bimetallic alloy catalysts on PCs, Pt3Pd1 on PCs displayed the most negative onset potential for methanol oxidation and the highest steady-state current (2.04 mA cm?2). This may be because the Pt3Pd1/PCs catalyst has the largest electrochemical active surface area (ESA), and because adding Pd to the catalyst improves the ability of the intermediate species to tolerate oxidation. The results show that the prepared Pt-Pd/PCs is a potential candidate for application as a catalyst in alkaline direct methanol fuel cells. |
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