การพัฒนาเคาน์เตอร์อิเล็กโทรดประเภทกราฟีนในเซลล์แสงอาทิตย์ชนิดสีย้อมไวแสง เพื่อใช้ทดแทนแพลทินัม

บทคัดย่อ

This research studied the synthesis of graphene or reduced graphene oxide by chemical method using glucose and flame as non-toxic and environmental-friendly reducing agents. The processes started with the oxidation of commercial graphite to obtain graphite oxide, using the modified Hummer’s method. The effects of the ratio of graphite and potassium permanganate (1:2, 1:3 and 1:4) on the properties of obtained products were investigated. After that, ultrasonication was used in a water solvent to exfoliate graphene oxide layer, followed by the reduction approach to obtain graphene or reduced graphene oxide. The as-prepared products were then characterized by TGA, FTIR, UV-Vis spectroscopy, XRD, Raman spectroscopy, SEM, TEM, Four point probe and Cyclic voltammetry. The results indicate that graphite oxide using 1:3 ratio had a good oxidation reaction. After reduced with glucose, its oxygen functional groups could be effectively eliminated. As a result, it had both a good electrical conductivity property and the possessed a good catalytic activity towards iodide/triiodide redox reactions. The fabrication of free-standing reduced graphene oxide papers was also studied. By using flame-induced reduction method, it was observed that asprepared reduced graphene oxide exhibited a smaller amount of oxygen functional groups and had a better electrical conductivity than that reduced by glucose. However, there were no redox peak observed in the cyclic voltammetry measurement, which indicated that the redox reactions of iodide/triiodide were not active.

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