Preparation And Test On Anode Catalysts Based Platinum Of Direct Methanol Fuel Cell

The basic structure and the current status and key technical problems.of direct methanol fuel cell (DMFC) are summarized in this paper. Andthe anode catalysts development and the preparation methods of anode catalysts are also reviewed in this paper. The factors that affect the performance of catalysts using impregnation reduction method are also introduced.We use the CHI-630A electrochemical analyzer, conventional three-electrode system (0.5 mol·L-1H2SO4 + 0.5 mol·L-1CH3OH) to test electrochemical properties of the catalysts, and use X-ray diffraction (X-ray XRD, XRD), Transmission electron microscopy (Transmission Electron Microscopy, TEM) to test physical characterizations of the catalysts.For process improvement of the PtRu/C catalyst, we studied the pH adjusting substances, carrier optimization, and orthogonal test. The results indicate that using sodium acetate and sodium hydroxide mixed solution of instead of a single sodium hydroxide to adjust the pH value showes higher catalytic activity. When the mole ratio of CH3COONa and H2PtCl6 was 2.4, the catalysts performance is better. Orthogonal test with the addition of sodium acetate, pH value, temperature these 3 orthogonal factors, when the pH value is 8, reduction temperature is 80°C, the total weight of 100 mg of 20% PtRu/C catalyst adding 0.7ml sodium acetate (0.2 mol·L-1), the calalyst that prepared in these conditions represents the best performance. Carbon mixed with molybdenum carbide that being used as catalysts carrier shows better performance than carbon carrier. For the high-loading catalyst, adjusts the concentration of the precursor, when the concentration of H2PtCl6 is 0.81 m mol·L-1, the catalyst shows highest activity. Using the same precursor concentration, prepare different loading of catalysts. With catalysts loading increasing, the catalysts property decline gradually. Adding sodium dodecylbenzene sulfonate (SDBS) can significantly improves the catalysts propertiy in the high loading catalysts.PtMo/C and PtMoNi/C alloy catalyst are also studied, the best atomic ratio of PtMo is 6:4, and the best PtMoNiatomic ratio is 6:2:2. the best atomic ratio of PtMo/C and PtMoNi/C alloy catalyst compared with PtRu/C catalysts. PtMo/C catalyst performance is poor than PtRu/C. PtMoNi/C alloy catalysts for methanol oxidation is better than PtMo/C and PtRu/C. But its oxidation potentials is slightly moving positively.