Synthesis of highly conductive graphene materials for dye-sensitized solar cells counter electrode

• Main Authors: Yung-Pin Chung, 鍾永彬
• Other Authors: Hong-Wen Wang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/75618204385612454020

碩士 === 中原大學 === 化學研究所 === 100 === In this study, preparation of graphene thin film electrode through graphite oxide was studied. First, multi-layer stacking of graphite was oxidized using sulfuric acid and potassium permanganate for 24h. After oxidation, the solids obtained were dried by freeze-drying and coating on glass substrate, then heat treatment at 650 oC was used to reduce the GO to graphene. PEG, PEO, PVP, Terpineol were used as the binder for reforming graphene into films. It shows that the PEG-made film achieves lower resistance, higher light transmittance than those of the other three binders. The efficiency of DSSC using PEG-made grahene electrode is around 85% of those using Pt-based electrode. At the beginning of this study, the thin-film resistance of graphene electrode is about 100-30 Ω/sq, The graphene was also suffered from the electrolyte, that is the film and substrate will be unstable when liquid electrolyte was present. When the glass substrate was modified using some polyelectrolytes, the resistance of graphene films go down to 5-10 Ω/sq. In the mean time, the efficiency of DSSCs using the modified graphene film electrode can achieve 90% of those using Pt-based electrode or even better. Finally, the catalytic ability of graphene, though is no better than platinum, there edges result more amount of the catalytic sites for electron transfer. Taking these results into account, the catalytic capability of graphene can be quite compatible to that of platinum, making this material a good alternative to platinum as a counter electrode for a high performance DSSC.