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以共聚物F127为软模板,酚醛树脂为碳源,引入硅藻土充当暂态支架,在不同硅藻土与酚醛树脂质量比下,用蒸发自组装法合成有序介孔碳材料.利用XRD,TEM,N2吸附-脱附对其结构进行表征,结果显示,与单一软模板相比,在硅藻土辅助下获得的介孔碳材料不仅具有高度有序的孔道,还具有更大的比表面积(717～773 m2 g-1)和孔径(3.9～11.3 nm).依据原料比例与介孔碳结构两者间的变化规律,初步探讨了硅藻土在制备中所起的辅助作用.采用微波多元醇还原法制备介孔碳载Pt电催化剂,在甲醇溶液中进行循环伏安测试,发现比表面积的增大有利于碳材料的电催化性能提高,当硅藻土与酚醛树脂的比例为0.5时,制备出的有序介孔碳比表面积最大,载Pt后呈现的正向氧化峰电流也最大.
Using the copolymer F127 as soft template and phenolic resin as carbon source, diatomite was introduced as a transient support to synthesize ordered mesoporous carbon materials by evaporation and self-assembly at different mass ratios of diatomite and phenolic resin.Using XRD TEM and N2 adsorption-desorption. The results showed that the mesoporous carbon materials obtained with the help of diatomaceous earth not only have highly ordered pores but also have a larger ratio Surface area (717 ~ 773 m2 g-1) and pore diameter (3.9 ~ 11.3 nm) .According to the variation of the ratio of raw materials and the structure of mesoporous carbon, the auxiliary role of diatomite in the preparation was preliminarily discussed. The preparation of mesoporous carbon supported Pt electrocatalysts by microwave polyol reduction method was carried out in cyclic voltammetry in methanol solution. It was found that the increase of specific surface area was beneficial to improve the electrocatalytic performance of carbon materials. When the ratio of diatomite to phenolic resin was 0.5, the prepared mesoporous carbon has the largest specific surface area and the peak forward oxidation peak current after Pt loading.