摘要
采用循环伏安法(CV)研究了凝胶电解质中I- 3/I-氧化还原行为, 凝胶电解质中I- 3/I-的表观扩散系数和相应的稳态扩散电流明显低于液体电解质. 通过对阴/阳离子的结合能和孔穴阻塞作用的研究解释了凝胶电解质电导率较液体电解质发生变化的原因. 制备的凝胶电解质电池具有较高的光电转换效率(6.6%), 其短路电流密度( J sc )仅比液体电解质电池低0.3～0.4 mA/cm2, 电池效率也仅低约0.6%.
The I3^-/I^- redox behavior for gel electrolytes and liquid electrolyte was studied by cyclic voltammetry. It is found that the apparent diffusion coefficient（D） values of triiodide and iodide ions in gel electrolytes were apparently lower than those in liquid electrolyte, the former were about third of the latter. The conductivity measurement of the gel electrolyte containing different sum of P（VDF-HFP） shows that the conductivity decreases with increasing the sum of P（VDF-HFP） in gel electrolyte. It may be due to that the pore is not well connected and the ionic transport is hindered by the pore blockage. We fabricated quasi-solid state dye-sensitized nano-thin membrane solar cells using gel electrolyte containing poly （vinylidenefluoride-cohexafluoropropylene） （PVDF-HFP） which showed an comparable photo-electric conversion efficiency to the liquid cell. The quasi-solid state solar cell with 5% P（VDF-HFP） showed the values of 0.70 V for open-circuit voltage, 15.52 mA/cm^2 for short-circuit photocurrent density, 0.62 and 6.61% for Fill Factor and photoelectric conversion efficiency under the illustration of AM 1.5（ 100 mW/cm） , respectively.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第10期1934-1937,共4页
Chemical Journal of Chinese Universities
基金
国家重点基础研究发展规划项目(批准号:G2000028200)资助.
