一步溶剂热法快速制备超细CoSn2纳米晶/石墨烯复合材料及其改进的电化学性能

In this work, we succeeded in the synthesis of CoSn2-nanocrystals/graphene-nanosheets (CoSn2/G) hybrid by a facile in situ one-pot solvothermal route. X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectra results revealed the formation of CoSn2 and the reduction of graphite oxide (GO) to graphene during the one-pot process. Transmission electron microscopy observation indicated that the spheric CoSn2 nanocrystals with a uniform size of 2?4 nm are anchored on graphene. The electrochemical tests showed that the CoSn2/G hybrid exhibits obviously improved electrochemical properties compared to bare Co-Sn alloy. The enhancement in the electrochemical properties could be attributed to the introduction of graphene that not only constructs two-dimensional conductive networks but also disperses and confines the CoSn2 nanocrystals, besides the buffering effect for the large volume changes.