通过溶胶-凝胶法和低温煅烧法,成功制备了二氧化钌/石墨烯纳米复合材料,并用XPS、TEM和XRD检测了产物形貌、粒径及晶型。实验表明,在复合材料中,水合二氧化钌颗粒呈球形,粒径约为5 nm,并均匀分散在石墨烯表面。该材料用于超级电容器中,表现出了良好的电容性质。当二氧化钌的质量分数为38%时,二氧化钌在复合材料中的比电容为546.6 F.g-1。较之二氧化钌,二氧化钌/石墨烯复合材料还表现出了更快的倍率性能、更出色的电化学稳定性(循环1 000圈后大约保持93%)以及更高的能量密度(26.5 W.h.kg-1)和功率密度(5 000 W.kg-1)。该复合材料不仅具备了石墨烯双电层电容的优点,而且还具备了二氧化钌赝电容的性质,是一种良好的储能材料。 The ruthenium dioxide / graphene nanocomposite was successfully prepared by sol-gel method and low temperature calcination method. The morphology, particle size and crystal form of the product were characterized by XPS, TEM and XRD. Experiments show that in the composite material, the hydrated ruthenium dioxide particles spherical shape, a particle size of about 5 nm, and uniformly dispersed in the graphene surface. This material is used in supercapacitors and shows good capacitive properties. When the mass fraction of ruthenium dioxide is 38%, the specific capacitance of ruthenium dioxide in the composite is 546.6 F.g-1. Ruthenium dioxide / graphene composites also exhibited faster rate performance, better electrochemical stability (approximately 93% after 1 000 cycles) and higher energy densities (26.5%) than ruthenium dioxide Whkg-1) and power density (5000 Wkg-1). The composite material not only possesses the advantages of the electric double layer capacitor of graphene, but also possesses the property of pseudo-capacitance of ruthenium dioxide and is a good energy storage material.