| 초록 |
There have been several attempts to utilize tungsten carbide as an electrocatalyst for methanol oxidation because of its platinum-like catalytic behavior, its stability in acid solutions at anodic potentials, and its resistance to CO poisoning. In this study, W2C microspheres were synthesized by heating mixtures of RF polymer (a carbon precursor) and AMT (a tungsten precursor). Platinum loaded W2C microspheres were synthesized by conventional borohydride reduction method. The charaterizations of AMT/RF polymer intermediate and W2C, Pt/W2C microspheres were analyzed by In-situ IR, STA, XRD, FE-SEM, HRTEM, TPD and Cyclic voltammetry. The BET surface area of the W2C microspheres is about 176m2g-1, and the CO uptake value is 956μmolg-1. 7.5wt% Pt/W2C particle size is about 6nm by Debye-Scherrer equation. Especially, the electrochemical surface area of Pt/W2C is several times higher than commercial catalyst (E-Tech). The mass activity of Pt (mAmg-1 of Pt taken at 0.75V) supported on W2C microspheres (7.5wt%) for methanol oxidation is higher by factors of 2.4 than commercial catalyst (E-Tech). |
