一步水热法合成MnO_2/RGO纳米复合材料（英文）

Synthesis of MnO_2/RGO by a One-Step Hydrothermal Method

采用一步水热法合成二氧化锰/氧化石墨烯(部分还原)纳米复合材料。实验中,以高锰酸钾、硫酸锰和氧化石墨烯溶液分别作为氧化剂、还原剂以及复合剂。对样品进行了透射电子显微镜、X射线衍射、拉曼光谱等表征。结果表明,与其他合成工艺相比,该方法不仅工艺简单,而且还可以极大地提高二氧化锰纳米颗粒的电化学性能。由于没有碳源的消耗,该方法制得的纳米复合材料可以极大地增加二氧化锰和氧化石墨烯之间的活性接触位点和提高二氧化锰的利用率。此种方法对于提高金属氧化物电容性能是一种非常有效的手段,并且有望应用于大规模制备超级电容器金属氧化物复合电极材料。

Manganese dioxide(MnO_2)/reduced graphene oxide(RGO) nanocomposites were fabricated by a novel one-step hydrothermal method. Potassium permanganate, manganese sulfate and graphene oxide(GO) were used as oxygenant, reductant and complex agent, respectively. The morphology and microstructure of the as-synthesized sample were characterized by transmission electron microscopy(TEM), Raman spectroscopy, and X-ray diffraction(XRD). The synthetic method can avoid some complicated procedures and remarkably enhance the electrochemical behaviors of manganese dioxide compared with other methods. Without consumption of carbon source in the synthesis of the nanocomposites, it can dramatically enlarge active-sites between manganese dioxide and graphene oxide; at the same time, it can also greatly increase the utilization of manganese dioxide. Therefore, it is a promising potential method to prepare the compounds which can be used as an effective electrode material for ultracapacitor.