A low cost mesoporous carbon/SnO2/TiO2 nanocomposite counter electrode for dye-sensitized solar cells
A low cost mesoporous carbon/SnO2/TiO2 nanocomposite counter electrode for dye-sensitized solar cells
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DOI：
10.1016/j.jpowsour.2011.10.097
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发表时间：
2012-03
影响因子：
9.2
通讯作者：
Weiwei Sun;Xiaohua Sun;T. Peng;Yumin Liu;Hongwei Zhu;Shishang Guo;Xingzhong Zhao
中科院分区：
文献类型：
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作者：
Weiwei Sun;Xiaohua Sun;T. Peng;Yumin Liu;Hongwei Zhu;Shishang Guo;Xingzhong Zhao
通过在掺氟氧化锡导电玻璃上涂覆均匀、粘稠的碳糊，制备了多孔性良好的碳/SnO 2/TiO 2纳米复合薄膜，可用作染料敏化太阳能电池（DSSC）的对电极。该碳浆通过在有机溶液中球磨碳、SnO 2粉末和TiO 2水溶胶的混合物来制备。用X射线衍射仪、扫描电镜、透射电镜、Brunauer-Emmett-Teller和Form Talysruf Profiler对复合膜进行了表征。结果表明，复合DSSC的光伏性能受SnO 2含量的影响。当含量增加到30%时，SnO 2不仅作为“骨架”增强了复合膜的机械稳定性，而且增加了比表面积和均方根粗糙度，从而提高了填充因子和短路电流，最终将功率转换效率从5.12%提高到6.15%。循环伏安分析和电子阻抗谱的优化复合膜显示更高的催化活性I3−/I−氧化还原反应和更低的电荷转移电阻相比，分别与Pt。基于该纳米复合材料对电极的染料敏化太阳能电池的效率高达6.15%，这与在类似条件下使用溅射Pt作为对电极的电池的效率相当。
Highly porous carbon/SnO2/TiO2nanocomposite films that can be used as counter electrodes in dye-sensitized solar cells (DSSCs) are fabricated by coating a homogeneous and viscous carbon paste on F-doped tin oxide conducting glass. The carbon paste is prepared by ball-milling a mixture of carbon, SnO2powder and TiO2hydrosol in an organic solution. The composite films are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscope, Brunauer–Emmett–Teller and Form Talysruf Profiler. The results indicate that the photovoltaic performances of the composite DSSCs are influenced by the content of SnO2. When the content is increased to 30%, SnO2not only acts as “framework” to strengthen the mechanical stability of the composite film but also increases the specific surface area and root-mean-square roughness, which improve fill factor and short-circuit current, finally increasing power conversion efficiency from 5.12% to 6.15%. Cyclic voltammetry analysis and electronic impedance spectroscopy of the optimum composite film display higher catalytic activity for I3−/I−redox reactions and much lower charge-transfer resistance compared with Pt, respectively. Dye-sensitized solar cells based on this nanocomposite counter electrode achieve efficiency as high as 6.15% which is comparable to that of the cells using sputtering Pt as counter electrode at similar conditions.