This study developed an innovative composite material using graphene oxide (GO) and macrocyclic Mn complex, which can be used as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). Varying weight ratios of GO and macrocyclic Mn complex were used, and the GO/Mn composite materials were comprehensively analyzed with scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and cyclic voltammetry. The results indicate that the reaction between the GO and the macrocyclic Mn complex can be used to evenly graft the latter onto the surface of graphene. Furthermore, the redox capacity of the macrocyclic Mn complex, along with the high surface area and highly conductive graphene, can enhance the conductivity and electrochemical catalytic capacity of the CE. This study used several GO/Mn CEs for the DSSC, and the current density-voltage, incident photo-to-current conversion efficiency, and electrochemical impedance spectroscopy results all suggest that the CE made of GO and macrocyclic Mn complex with a weight ratio of 1:10 (GO/Mn (1:10)) has the greatest redox capacity and the highest device efficiency of 7.47%, which is even higher than a DSSC using platinum CE. Evidently, the GO/Mn composite material is successful as a CE for the DSSC, and because of its low cost and excellent performance, it is an ideal substitute for the expensive Platinum CE.

这项研究开发了一种创新的复合材料，该材料使用氧化石墨烯（GO）和大环Mn配合物，可用作染料敏化太阳能电池（DSSC）中的对电极（CE）。使用GO和大环Mn配合物的不同重量比，并通过扫描电子显微镜，透射电子显微镜，傅立叶变换红外光谱，能量色散X射线光谱，拉曼光谱，X射线光电子对GO / Mn复合材料进行了综合分析。光谱，X射线衍射和循环伏安法。结果表明，GO和大环Mn配合物之间的反应可以用来将后者均匀地接枝到石墨烯的表面上。此外，大环锰配合物的氧化还原能力，以及高表面积和高导电石墨烯，可以增强CE的电导率和电化学催化能力。这项研究使用了几种GO / Mn CEs作为DSSC，电流密度-电压，入射光电流转换效率和电化学阻抗谱结果均表明，GO和大环Mn配合物制成的CE的重量比为1:10（GO / Mn（1:10））的氧化还原容量最大，器件效率最高，为7.47％，甚至比使用铂金CE的DSSC还要高。显然，GO / Mn复合材料已成功用作DSSC的CE，并且由于其低成本和出色的性能，它是昂贵的Platinum CE的理想替代品。入射光电流转换效率和电化学阻抗谱结果均表明，GO和重量比为1:10（GO / Mn（1:10））的大环Mn配合物制成的CE具有最大的氧化还原能力，并且最高器件效率为7.47％，甚至高于使用铂金CE的DSSC。显然，GO / Mn复合材料已成功用作DSSC的CE，并且由于其低成本和出色的性能，它是昂贵的Platinum CE的理想替代品。入射光电流转换效率和电化学阻抗谱结果均表明，GO和重量比为1:10（GO / Mn（1:10））的大环Mn配合物制成的CE具有最大的氧化还原能力，并且最高器件效率为7.47％，甚至高于使用铂金CE的DSSC。显然，GO / Mn复合材料已成功用作DSSC的CE，并且由于其低成本和出色的性能，它是昂贵的Platinum CE的理想替代品。