title: Hierarchical titania mesoporous sphere/graphene composite, synthesis and application as photoanode in dye sensitized solar cells.
abstract: Hierarchical TiO(2) mesoporous sphere/graphene composites (HTMS/Gs) were prepared by incorporation proper amounts of graphene oxide (GO) into the reaction system toward hierarchical TiO(2) mesoporous spheres (HTMSs). The HTMS/Gs inherit the merits of high specific surface area derived from both HTMS and graphene, as well as the well conductivity of graphene. Power conversion efficiencies (PCEs) of dye sensitized solar cells (DSSCs) using HTMS/Gs as photoanode materials were also investigated. The graphene content in HTMS/G exhibited great influence on PCE. Lower graphene content in HTMS/G showed superior dye adsorption capacity, lower charge recombination and thus higher photocurrent density over bare HTMS. However, excessive graphene promoted the recombination of photo-generated electrons, which deteriorated the PCE. Due to the high dye adsorption capacity and the prolonged electron recombination lifetime, the HTMS/G contains 5.68 wt.% graphene, denoted as HTMS/G(5.68), boosted up the short circuit current density (J(sc)) to 16.17 mA/cm(2), and a PCE of 7.19% was achieved, which is 21.8% higher than that of bare HTMS.
authors: College of Chemistry and Chemical Engineering, Henan Normal University, Henan, Xinxiang 453007, PR China.
authors: Jiuli
authors: J
authors: Chang
authors: Jiangli
authors: J
authors: Yang
authors: Pengfei
authors: P
authors: Ma
authors: Dapeng
authors: D
authors: Wu
authors: Li
authors: L
authors: Tian
authors: Zhiyong
authors: Z
authors: Gao
authors: Kai
authors: K
authors: Jiang
authors: Lin
authors: L
authors: Yang