染料敏化太阳电池多级孔炭对电极的制备及性能研究

Preparation and Property of Hierarchical Porous Carbon Counter Electrode for Dye-sensitized Solar Cells

以F127为模板剂,采用自组装与后活化相结合制备了具有微孔—介孔结构的多级孔炭.N2吸附等温线分析表明后活化可在介孔炭孔壁上生成大量微孔.电化学阻抗谱测量表明多级孔炭电极对I3-还原反应的催化活性明显高于介孔炭电极,电荷迁跃电阻为0.3—.cm2.多级孔炭电极催化活性高是由于它具有较高的比表面和特殊的多级孔结构,有效比表面积较高.以多级孔炭电极为对电极组装染料敏化太阳电池,电池的短路电流密度、开路电压和填充因子分别为0.624V、15.44 mA/cm2和0.67,相应的光电转换效率为6.48%,比介孔炭对电极电池的光电转换效率提高了11.5%.

Hierarchical porous carbon（HPC） was prepared by the combination of self-assembly and post activation.The analysis of N2 adsorption isotherm for carbon samples indicated that large quantities of micropores were gener-ated within the mesopore wall of mesoporous carbon.HPC electrode exhibited high electrocatalytic activity for I3-reduction due to its high surface area and unique hierarchical porous structure.Electrochemical impedance spec-troscopy measurement indicated that the charge-transfer resistance of HPC electrode was 0.3 ？.cm2.The short-circuit current density,the open-circuit voltage and the fill factor of dye-sensitized solar cell with HPC counter electrode were 0.624 V,15.44 mA/cm2 and 0.67,respectively.The overall conversion efficiency of the dye-sensitized solar cell with HPC counter electrode is 6.48%,which is 11.5% higher than that of the cell with mesoporous carbon counter electrode.