▎ 摘　　要

A simple and efficient synthesis of Co2C using graphene oxide (GO) as a carbon source has been established. The procedure consists of two steps: (I) formation of a GO/Co3O4 nanocomposite via the ammonia-evaporation-induced method and (2) conversion of Co3O4 to Co2C under a H-2/N-2 mixture at a low temperature (200 degrees C). Transmission electron microscopy (TEM) analysis showed that Co2C has a crystallite size of around 5 nm and a mesoporous structure with a pore size of ca. 3-5 nm. The amphiphilic behavior of GO contributes to the high porosity, large specific surface area, and narrow pore size distribution of the Co2C. Tungsten carbide has also been successfully obtained using GO as a carbon source at a much lower temperature than that of the traditional carbothermal synthesis. Therefore, this method could be extended to the production of other important carbides with desired mesoporous features at low temperatures.