石墨烯和铂/石墨烯的合成及其表征

Preparation and Characterization of Graphene and Platinum/Graphene

以天然鳞状石墨为原料,采用化学氧化法合成氧化石墨,在此基础上采用低温热解膨胀结合微波加热乙二醇还原法合成石墨烯(Gr)以及铂/石墨烯(Pt/Gr)复合材料。SEM和TEM显示所制备的石墨烯为层状结构的半透明薄膜。采用X射线光电子能谱(XPS)和傅立叶转换红外光谱(FTIR)分别确定氧化石墨、膨胀石墨及石墨烯表面含氧官能团的数量和性质。以所制备的碳氧原子比5.94的石墨烯作为载体制备出可用于质子交换膜燃料电池的高负载量的Pt/Gr催化剂,在铂载量高达60%时,表面铂粒子依然具有高分散性,平均粒径为3.8 nm。

Graphite oxide was prepared from natural flake graphite by chemical oxidation method and subsequently thermal expansion method was applied to produce the expanded graphite（EG）.On the basis of this,we employed the microwave-heating ethylene glycol method to synthesize graphene and platinum/graphene（Pt/Gr） composite.The SEM and TEM images revealed that the graphene we produced by our method was subtransparent thin film with layer structures.FT-IR and XPS were used to characterize the amount and property of carbon materials.We found that grapheme（nC/nO=5.94） can be used as the carrier of high platinum loading PEMFC catalyst.When the mass fraction of platinum increased to 60%,the platinum particles can still uniformly scattered on the surface of graphene without aggregation seriously.The particle size of platinum was 3.8 nm on average.