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Photoelectrochemical properties of MWCNT-TiO2 hybrid materials as a counter electrode for dye-sensitized solar cells
Authors:Yu-Qiao wang  Xue-Ling Gao  Bo Song  Yun-Liang Gu  Yue-Ming Sun
Affiliation:a School of Chemistry & Chemical Engineering, Southeast University, Nanjing 211189, China;b Jiangsu Optoelectronic Functional Materials & Engineering Laboratory, Nanjing 211189, China
Abstract:The MWCNT-TiO_2 hybrid materials were prepared by a simply mixing method and used as a counter electrode(CE) for dye-sensitized solar cells.Compared with the platinum CE,MWCNT-TiO_2 CE has the similar redox voltage and current response in the cyclic voltammetry.The electrochemical catalytic activity was characterized by the electrochemical impedance spectroscopy and Tafel curve,including the equivalent circuit,the exchange current density,the limiting diffusion current density,and the diffusion coefficient of triiodide/iodide redox species.The results indicate that the reduction process from triiodide to iodide is determined by the kinetic-controlled and diffusion-limited processes.The device performance is optimal based on the MWCNT-TiO_2(mass ratio of 2:1) CE,such as the open-circuit voltage of 0.72 V,the short-circuit photocurrent density of 15.71 mA/cm~2,the fill factor of 0.68,and the photon-to-electron conversion efficiency of 7.69%.
Keywords:Photoelectrochemistry Counter electrode Hybrid material Solar cell
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