大麻杆生物质碳负载Pt用于电催化氧化甲醇

Hemp rod biomass carbon-loaded nano-Pt for methanol electro-oxidation

首先以大麻杆为前驱体,利用化学活化法,在氮气保护下高温炭化制备多孔结构碳材料。利用扫描电镜、X射线粉末衍射、氮吸脱附实验等探究温度和碱碳比对碳材料结构和孔径分布的影响。结果表明:当温度一定时,随着碱碳比增大比表面积呈抛物线上升。在碱碳比一定的情况下,温度升高,比表面积明显增大,比表面积可达1622.10 m^2·g^-1。然后,利用光还原法,以大麻杆碳材料为载体,磷钨酸为光催化还原剂、稳定剂和包覆剂,异丙醇作供电子体,在紫外光的照射下一步合成多酸基@Pt大麻杆碳复合材料并考察其电化学性能。研究表明此复合材料电催化氧化甲醇得到峰电流密度为4.87 mA·cm^-2,表现出了较好的催化活性和稳定性。

The porous carbon was prepared using the hemp rod as the precursor by chemical activation method under high temperature and N2 atmosphere.The effects of temperature and alkali-carbon ratio on the structure and pore size distribution of carbon materials were investigated by SEM,XRD and nitrogen adsorption and desorption experiments.The results show that the area increases with the increase of alkali-carbon ratio at the same temperature.When the ratio of alkali to carbon is the same,the temperature increases and the specific surface area increases significantly,the specific surface area can reach 1622.10 m^2·g^-1.Then,using the photo-reduction method,the hemp rod carbon is worked as the carrier,PW12 is the photocatalytic reducing agent,stabilizing agent and coating agent and the isopropanol is acted as the electron donor.The PW12@Pt hemp rod carbon nanocomposites are synthesized under the irradiation of UV light.Electrochemical studies indicate that the as-prepared nanocomposites exhibit apparent electrocatalytic activity(peak current density:4.87 mA·cm^-2)and stability towards methanol electrooxidation.