Preparation and characterization of oxo composite Pt/C catalyst and study on its catalytic performance for electro-oxidation of methanol
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摘要: 利用亞錫酸對氯鉑酸的弱的多步驟還原制備新型Pt/C催化劑.用XRD、HRTEM、EDS、DSC以及氫吸附電化學對所制備的催化劑進行了表征,并用循環伏安和恒電位極化對其進行了甲醇電氧化催化活性測定.實驗結果表明,應用亞錫酸法合成的Pt/C催化劑具有很高的甲醇電氧化催化活性,在0.5V(SCE)電位下,其質量活性約為亞硫酸路線合成的Pt/C催化劑的2倍.亞錫酸法可在納米尺度范圍內生成金屬Pt和Pt氧化物共存的復合型碳載催化劑,這種含氧復合型催化劑可以促進Pt在甲醇電氧化過程中雙功能作用的有效協調.Abstract: The weak multi-step reduction of stannous acid on hexachloroplatinic acid was utilized to prepare a new type of Pt/C catalyst. The catalyst was characterized by XRD, HRTEM, EDS, DSC and H-adsorption electrochemistry, and its catalytic activity for electro-oxidation of methanol was estimated by cyclic voltammogram and potentialstatic steady-state polarization. The results indicate that Pt/C catalyst prepared by the new method is with high activity for electro-oxidation of methanol which possesses about two-fold mass activity at 0.5 V (SCE) compared with Pt/C prepared by sulfurous route. The stannous method can produce a composite carbon-supported catalyst with Pt metal and Pt oxides co-exiting within nanometer dimension. The oxo composite catalyst could enhance the harmony of the hi-function of Pt during electro-oxidation of methanol.
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Key words:
- fuel cell /
- Pt/C catalyst /
- methanol-oxidation /
- stannous method
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