酚醛树脂基泡沫炭的制备工艺改进及在光谱电化学中的应用

以聚氨酯泡沫为模板,利用酚醛树脂制备过程中的碱催化剂对模板进行原位开孔,经酚醛树脂浸渍-固化-炭化过程制备了网状泡沫炭.该工艺省去了传统方法中聚氨酯模板预开孔的过程,简化了实验步骤,得到了高开孔率的泡沫炭.所得泡沫炭展现了典型的三维立体网状大孔结构,孔径范围约为400～600μm,具有较高的抗氧化温度和较低的石墨化程度.研究了泡沫炭作为电极测量铁-邻二氮菲配合物的电化学行为,发现泡沫炭电极在铁-邻二氮菲配合物溶液中出现了氧化还原峰,在510nm波长处的吸光度随着工作电位的提高而降低,且电极具有一定的透光性,表明所得泡沫炭有望发展为良好的光透电极材料.

Improved synthesis of carbon foams and their application in spectroelectrochemistry

An improved process for the preparation of carbon foams with high open porosity has been reported using polyurethane foam as templates and phenol-formaldehyde resin as carbon sources by impregnation, solidification and carbonization process. Alkali solution is used as both the catalyst of resin and the open-cell agent of the polyurethane foam,which saves the pretreatment of the template by alkali. The results have shown that the as-obtained carbon foams have 3D foam structures, and their pore size distributions center at 400-600 μm with the poor graphitization. The carbon foam is used to measure the electrochemistry behaviors. It is found that the carbon foam electrode shows ob- vious redox peaks when impregnated into the iron-phenanthroline complex solution and the absor- bance value at the wavelengths of 510 nm decreases with the increase of the working potential. Those show that the carbon foam can be used as optically transparent electrode materials.