School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore.
Nanoscale. 2011 Nov;3(11):4752-8. doi: 10.1039/c1nr10879d. Epub 2011 Oct 11.
Reduced graphene oxide (rGO) supported highly porous polycrystalline V(2)O(5) spheres (V(2)O(5)/rGO) were prepared by using a solvothermal approach followed by an annealing process. Initially, reduced vanadium oxide (rVO) nanoparticles with sizes in the range of 10-50 nm were formed through heterogeneous nucleation on rGO sheets during the solvothermal process. These rVO nanoparticles were oxidized to V(2)O(5) after the annealing process in air at 350 °C and assembled into polycrystalline porous spheres with sizes of 200-800 nm. The weight ratio between the rGO and V(2)O(5) is tunable by changing the weight ratio of the precursors, which in turn affects the morphology of V(2)O(5)/rGO composites. The V(2)O(5)/rGO composites display superior cathode performances with highly reversible specific capacities, good cycling stabilities and excellent rate capabilities (e.g. 102 mA h g(-1) at 19 C).
采用溶剂热法和退火处理制备了还原氧化石墨烯（rGO）负载的高多孔多晶 V(2)O(5) 球（V(2)O(5)/rGO）。最初，在溶剂热过程中，rGO 片上通过异质成核形成了尺寸在 10-50nm 范围内的还原氧化钒（rVO）纳米颗粒。这些 rVO 纳米颗粒在 350°C 空气中退火后被氧化为 V(2)O(5)，并组装成尺寸为 200-800nm 的多晶多孔球。通过改变前体的重量比可以调节 rGO 和 V(2)O(5)之间的重量比，从而影响 V(2)O(5)/rGO 复合材料的形态。V(2)O(5)/rGO 复合材料表现出优异的阴极性能，具有高可逆比容量、良好的循环稳定性和优异的倍率性能（例如，在 19C 时为 102mAh g(-1)）。
