采用Hummers法液相氧化合成了氧化石墨(GO),通过高真空低温热膨胀法制备得到了高比表面积的石墨烯(GNS)材料。采用X射线衍射(XRD)、傅里叶变换红外(FT-IR)光谱、X射线光电子能谱(XPS)、拉曼光谱(RS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等分析手段对石墨烯样品进行了表征。结果表明,石墨烯还原彻底,呈褶皱的片层状结构,缺陷少;BET测试及氢气高压吸附实验结果表明,通过高真空低温热剥离法制备的石墨烯材料比表面积高达908.3m2/g,并且拥有丰富的孔道结构;在温度为25、40和55℃,压力2500kPa条件下,氢气的吸附量分别达到了1.81%、0.995%和0.44%(质量分数),表明了石墨烯在储氢领域拥有着广阔的应用前景。
Graphite oxide(GO) was prepared by hummers liquid oxidation method and the graphene with high surface area was then prepared by a high-vacuum and low-temperature chemical exfoliation method.The as-prepared GNS was characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),Raman spectra(RS),scanning electron microscopy(SEM) and transmission electron microscopy(TEM),respectively.The results indicate that graphite oxide is completely reduced to graphene and the graphene possesses a plicated layer structure with few defects.BET measurement and hydrogen adsorption experiment results show that the BET specific surface area of the graphene was about 908.3m2/g with rich pore structure and that hydrogen storage capacity of H2 on graphene reached up to 1.81%,0.995% and 0.44wt% at 25,40,55℃ respectively,GNS was one of promising materials in the field of hydrogen storage.