World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanakgu, Seoul 151-742, Korea.
ACS Appl Mater Interfaces. 2012 Oct 24;4(10):5287-92. doi: 10.1021/am301245s. Epub 2012 Sep 27.
Multiscale porous (MSP) TiO(2) nanofibers (NFs) were fabricated using a simple electrospinning and etching process with TiO(2)/SiO(2) composite NFs for high-efficiency dye-sensitized solar cells (DSSCs). TiO(2) NFs with different pore sizes (small, large, and multiscale) were prepared using SiO(2) nanoparticles of various sizes. The surface area of the MSP TiO(2) NFs was nine times higher than that of pristine TiO(2) NFs, providing sufficient dye adsorption for light harvesting as well as efficient paths for electrolyte contact. Moreover, the one-dimensional structure provides efficient light scattering and fast electron transport. As a result, DSSCs exhibited an enhanced current density (J(sc)) of 16.3 mA cm(-2) and a high photoconversion efficiency (η) of 8.5%, greater than those of conventional photoelectrodes made of TiO(2) nanoparticles (J(sc) of 12.0 mA cm(-2) and η of 6.0 %).
采用简单的静电纺丝和刻蚀工艺制备了多尺度多孔（MSP）TiO2 纳米纤维（NFs），并使用 TiO2/SiO2 复合 NFs 为高效染料敏化太阳能电池（DSSCs）。使用不同尺寸的 SiO2 纳米颗粒制备了具有不同孔径（小、大、多尺度）的 TiO2 NFs。MSP TiO2 NFs 的比表面积比原始 TiO2 NFs 高九倍，为光捕获提供了足够的染料吸附以及与电解质接触的有效途径。此外，一维结构提供了有效的光散射和快速的电子传输。结果，DSSC 表现出增强的电流密度（J(sc)）为 16.3 mA cm(-2)和高光电转换效率（η）为 8.5%，大于由 TiO2 纳米颗粒制成的传统光电管（J(sc)为 12.0 mA cm(-2)和 η 为 6.0%）。
