In this study, electrochemical impedance spectroscopy of two types of photoanodes made up of TiO₂ and graphene–TiO₂ (with 6 wt% of graphene) composite are investigated in the dye-sensitized solar cells. In the first experiment, a 7-μm thickness of TiO₂ was used as a photoanode. Therefore, the short circuit current (SCC), open circuit voltage (OCV), and efficiency were obtained equal to 6.6 mA, 650 mV, and 3.4%, respectively. Also, the electron lifetime of this experiment in the anode section was obtained 13.2 ms. In the second experiment, graphene–TiO₂ composite with 7-μm thickness was used as a photoanode. Graphene, due to its small energy gap (approximately 0.1 ev), is an appropriate material to absorb more photons. Therefore, more electrons participate in generating SCC. So because of low impedance and high carrier mobility of graphene, electrons can move toward the fluorine-doped tin oxide easily, thus avoiding the recombination of electrons with highest occupied molecular orbital holes, resulting in improved efficiency of about 6.97%. The SCC, OCV, and electron lifetime obtained from the second experiment were obtained equal to 16.29 mA, and 690 mV, and 31 ms, respectively.

在这项研究中，研究了在染料敏化太阳能电池中由TiO ₂和石墨烯-TiO ₂（石墨烯含量为6 wt％）组成的两种类型的光阳极的电化学阻抗谱。在第一个实验中，使用厚度为7μm的TiO ₂作为光阳极。因此，获得的短路电流（SCC），开路电压（OCV）和效率分别等于6.6 mA，650 mV和3.4％。另外，该实验在阳极部分的电子寿命为13.2ms。在第二个实验中，石墨烯–TiO ₂厚度为7μm的复合材料用作光电阳极。石墨烯的能隙小（约0.1 ev），是吸收更多光子的合适材料。因此，更多的电子参与产生SCC。因此，由于石墨烯的低阻抗和高载流子迁移率，电子可以容易地向掺杂氟的氧化锡移动，从而避免了电子与占据最高分子轨道空穴的复合，从而使效率提高了约6.97％。从第二个实验获得的SCC，OCV和电子寿命分别等于16.29 mA，690 mV和31 ms。