对电极性能对染料敏化太阳电池动力学过程的影响

Investigation of the Dynamic Processes in Dye-sensitized Solar Cells Based on Capability of Counter Electrode

借助电化学阻抗谱(EIS)和强度调制光电流谱(IMPS)/强度调制光电压谱(IMVS)技术,采用不同纳米TiO2多孔薄膜对电极研究了染料敏化太阳电池(DSC)内部2个主要电荷输运过程的内在联系,并探讨了载Pt材料对DSC界面动力学过程及电池宏观性能的影响机理.借助等效电路模型分析了基于不同对电极材料电池的填充因子变化原因.结果表明,对电极材料的电极电荷交换过程制约光阳极膜内电子传输,进而影响电池光伏性能;同时对电极催化反应速率主要与催化剂活性、载Pt材料电导率和催化反应面积有关.

The charge transfer dynamic processes in dye-sensitized solar cells （DSC） with a TiO2 porous counter electrode was investigated by electrochemistry impedance spectrum （EIS） and intensity-modulated pho- tocurrent spectroscopy （IMPS）/intensity-modulated photovoltage spectroscopy （IMVS）. The relationship be- tween several dominating charge transfer processes in DSC was discussed. The effect mechanism of different counter electrode materials on short-circuit current density （Jsc） and fill factors （FF） were analysed by equiv- alent circuit. It is found that, the electron transport process in TiO2 anode is seriously limited by a bad counter electrode material. The capability of counter electrode is mainly determined by the activity of catalyzer, the conductance of the carrier material and the effective contact area.