石墨烯/铂复合材料的制备及电化学性能研究

采用Hummers法制备氧化石墨,再超声分散于去离子水中形成稳定的氧化石墨分散液。分散液与氯铂酸溶液混合后,氧化石墨烯还原氯铂酸产生大量铂纳米粒子,铂粒子被牢固地锚在氧化石墨烯片上,最后将所得到的氧化石墨烯/铂复合物置于管式炉中在Ar/H2气氛中于800℃下热裂解制备出石墨烯/铂复合材料。形貌与纳米结构分析表明,氧化石墨已被彻底还原成石墨烯,铂纳米粒子均匀分散在褶皱的石墨烯纳米片间。电化学阻抗研究进一步揭示复合材料的电子转移阻抗明显小于石墨烯,呈示铂纳米粒子掺入石墨烯片层大大改善了导电性。石墨烯/铂复合材料应用于对苯二酚的电化学检测,检出限达1.6×10-7mol.L-1,这说明该材料具有优异的电催化性能。

Synthesis and Electrochemical Property of the Graphene/Pt Composites

Graphite oxide was prepared by Hummers′ method and was dispersed in the deionized water with the help of ultrasonic wave to form stable graphene oxide dispersion.After above dispersion was mixed with chloroplatinic acid solution,the graphene oxide rapidly reduced chloroplatinic acid and produce great deal of platinum nanoparticles,which were tightly anchored in the graphene oxide nanosheets.Finally,the obtained graphene oxide/platinum composite was placed in a tube furnace and further reduced in an atmosphere of Ar/H2 under 800 ℃ to graphene/platinum composite.The characterization of morphology and nanostructure shows that the graphite oxide has been thoroughly reduced to graphene and platinum nanoparticles were well dispersed in between draped graphene nanosheets.The electrochemical impedance spectroscopy analysis further revealed the electron transfer impedance of the composite is obviously lower than sole graphene,indicating that the introduction of platinum particles remarkably improve the electrical conductivity.Moreover,the obtained graphene/platinum composite was also applied to electrochemical determination of hydroquinone.The detection limit was found to be 1.6×10-7 mol·L-1.This demonstrated the composite is of excellent electrocatalytic property.