System on Chip Chemical Process Research Center, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea.
ACS Appl Mater Interfaces. 2011 Mar;3(3):857-62. doi: 10.1021/am101204f. Epub 2011 Feb 25.
Sub-micrometer-sized colloidal graphite (CG) was tested as a conducting electrode to replace transparent conducting oxide (TCO) electrodes and as a catalytic material to replace platinum (Pt) for I(3)(-) reduction in dye-sensitized solar cell (DSSC). CG paste was used to make a film via the doctor-blade process. The 9 μm thick CG film showed a lower resistivity (7 Ω/◻) than the widely used fluorine-doped tin oxide TCO (8-15 Ω/◻). The catalytic activity of this graphite film was measured and compared with the corresponding properties of Pt. Cyclic voltammetry and electrochemical impedance spectroscopy studies clearly showed a decrease in the charge transfer resistance with the increase in the thickness of the graphite layer from 3 to 9 μm. Under 1 sun illumination (100 mW cm(-2), AM 1.5), DSSCs with submicrometer-sized graphite as a catalyst on fluorine-doped tin oxide TCO showed an energy conversion efficiency greater than 6.0%, comparable to the conversion efficiency of Pt. DSSCs with a graphite counter electrode (CE) on TCO-free bare glass showed an energy conversion efficiency greater than 5.0%, which demonstrated that the graphite layer could be used both as a conducting layer and as a catalytic layer.
亚微米级胶体石墨 (CG) 被测试作为导电电极替代透明导电氧化物 (TCO) 电极，并作为催化材料替代铂 (Pt) 用于染料敏化太阳能电池 (DSSC) 中碘三离子 (I(3)(-)) 的还原。CG 浆料通过刮刀工艺制成薄膜。9 μm 厚的 CG 薄膜表现出比广泛使用的掺氟氧化锡 TCO（8-15 Ω/◻）更低的电阻率（7 Ω/◻）。测量了该石墨薄膜的催化活性，并与 Pt 的相应性质进行了比较。循环伏安法和电化学阻抗谱研究清楚地表明，随着石墨层厚度从 3 μm 增加到 9 μm，电荷转移电阻减小。在 1 个太阳光照射下（100 mW cm(-2)，AM 1.5），在掺氟氧化锡 TCO 上使用亚微米级石墨作为催化剂的 DSSC 的能量转换效率大于 6.0%，与 Pt 的转换效率相当。在无 TCO 的裸玻璃上使用石墨对电极 (CE) 的 DSSC 的能量转换效率大于 5.0%，这表明石墨层可以同时用作导电层和催化层。
