Photoelectrochemical properties of MWCNT-TiO_2 hybrid materials as a counter electrode for dye-sensitized solar cells  

作　　者：Yu-Qiao Wang Xue-Ling Gao Bo Song Yun-Liang Gu Yue-Ming Sun 

机构地区：[1]School of Chemistry & Chemical Engineering,Southeast University [2]Jiangsu Optoelectronic Functional Materials & Engineering Laboratory

出　　处：《Chinese Chemical Letters》2014年第4期491-495,共5页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(No.21173042);National Basic Research Program of China(No.2013CB932902);Fundamental Research Funds for the Central Universities(No.3207043401);Science&Technology Support Project of Jiangsu(No.BE2013118);Jiangsu Key Laboratory of Environmental Material&Environmental Engineering(No.JHCG201012)

摘　　要：The MWCNT-Ti02 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-TiO2 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-TiO2 （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/cm2, the fill factor of 0.68, and the photon-to-electron conversion efficiency of 7.69%.The MWCNT-Ti02 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-TiO2 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-TiO2 （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/cm2, the fill factor of 0.68, and the photon-to-electron conversion efficiency of 7.69%.

关 键 词：Photoelectrochemistry Counter electrode Hybrid material Solar cell 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383[一般工业技术—材料科学与工程]