▎ 摘　　要

Attributed to facile fabrication, low production costs and outstanding photoelectric properties, dye-sensitized solar cells (DSCs) have attracted widespread attention in recent years. In order to achieve better photoelectric conversion efficiency of the DSCs, a series of TiO2 nanocomposite photoanodes co-doped with different amounts of hybrid SiO2@Au nanostructures and certain amount of graphene are prepared by a mechanical ball milling method. The influence of SiO2@Au nanostructures and graphene on the performance of the photoanodes and their DSCs were investigated. The Au nanoparticles can remarkably enhance the shortcircuit current density (J(sc)) due to the local surface plasmon resonance effect of the noble metal nanoparticles. As a unique two-dimensional material, graphene has several amazing characteristics, such as high specific surface area and excellent conductivity. Studies showed that by introducing both SiO2@Au nanostructures and graphene, the light-absorbing, electron mobility and dye loading of the photoanodes were remarkably increased. Experimental results indicated that in comparison with those DSCs based with pure TiO2 photoanode, the DSCs with photoanodes incorporated with SiO2@Au nanostructures and graphene showed the optimal performance with short-circuit current density (J(sc)) of 15.59 mA/cm(2) and photoelectric conversion efficiency (PCE) of 6.68%, increasing significantly by 15.67% and 8.8%, respectively. This significant enhancement in J(sc) and PCE of DSCs are mainly attributed to the increase in light-absorption and dye-loading of the photoanodes due to the hybrid SiO2@Au nanostructures and graphene.