摘要： Dye-sensitized solar cells (DSCs) are a promising PV device to solve global energy-related problems because it is clean, inexhaustible and readily available. In order to improve the stability and reliability of the DSCs, ionic liquid (IL) electrolyte is a good choice for replacement of volatile solvent electrolyte systems (e.g. acetonitrile). However, the high viscosity of ionic liquids leads to mass-transport limitations on the photocurrents in the DSCs. In this report, a new porous photoanode made by tetrapod-like ZnO (T-ZnO) nanopowders provides not only a fast electron transport path in ZnO but also an efficient ionic diffusion pathway in the photoanode pore, comparing to the spherical commercial ZnO (C-ZnO) nanopowders. In addition, the ionic diffusion dynamics of T-ZnO and C-ZnO devices are characterized by electrochemical impedance analysis (EIS), photocurrent transient dynamics. We observed the presence of a tetrapod-like framework, which allowed the photoanode to provide a more efficient ionic diffusion pathway than conventional one made of commercial spherical nanopowders provided. [Display omitted] ► The tetrapod-like ZnO nanopowder provides fast electron transport in ZnO and efficient ionic diffusion pathway in the photoanode pore. ► The recombination rate of T-ZnO-based DSC is lower than that of C-ZnO one. ► The ion diffusion ability in tetrapod-like ZnO is about two times improvement, which enables the regeneration ability of dye molecular by redox couples. 出版者： Amsterdam: Elsevier B.V 出版日期： 2012-10-15 出處： Journal of power sources, 2012-10, Vol.216, p.330-336 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2012 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0378-7753 識別號： EISSN: 1873-2755 識別號： DOI: 10.1016/j.jpowsour.2012.05.079 識別號： CODEN: JPSODZ
