共查询到7条相似文献,搜索用时 15 毫秒
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文章采用二步阳极氧化法在纯钛片上制备了TiO2纳米管阵列,并用GO溶液修饰与其形成GO/TiO2纳米复合薄膜,修饰后的复合薄膜光电化学性能增强,组装成DSSC提高其光电转换效率,短路电流密度为13.2 mA·cm-2,光电转换效率为6.22%,相对于基于TiO2纳米管的DSSC电池分别提高了53%和30%。 相似文献
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采用阳极氧化法制备了高度有序的TiO2纳米管阵列,借助XRD、TEM、SEM、EDX以及恒流充/放电方法以及循环伏安法研究了其微观结构、形貌及脱/嵌锂性能,并与锐钛矿型进行了比较研究.结果表明:阳极氧化法制备的TiO2纳米管阵列为无定形的非晶相结构,且沿垂直于钛片表面的方向定向排列;450℃热处理2h可促使TiO2纳米管由非晶相结构转变成锐钛矿型晶体,但并没有明显影响纳米管阵列的形貌;与锐钛矿型TiO2纳米管阵列电极相比,非晶态电极表现出了较高的脱/嵌锂容量,因为非晶态电极中的无序结构和缺陷为Li+脱/嵌提供了更多的空间和空位. 相似文献
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Dharani Sabba Shweta Agarwala Stevin S Pramana Subodh Mhaisalkar 《Nanoscale research letters》2014,9(1):14
TiO2 hierarchical nanostructures with secondary growth have been successfully synthesized on electrospun nanofibers via surfactant-free hydrothermal route. The effect of hydrothermal reaction time on the secondary nanostructures has been studied. The synthesized nanostructures comprise electrospun nanofibers which are polycrystalline with anatase phase and have single crystalline, rutile TiO2 nanorod-like structures growing on them. These secondary nanostructures have a preferential growth direction [110]. UV–vis spectroscopy measurements point to better dye loading capability and incident photon to current conversion efficiency spectra show enhanced light harvesting of the synthesized hierarchical structures. Concomitantly, the dye molecules act as spacers between the conduction band electrons of TiO2 and holes in the hole transporting medium, i.e., spiro-OMeTAD and thus enhance open circuit voltage. The charge transport and recombination effects are characterized by electrochemical impedance spectroscopy measurements. As a result of improved light harvesting, dye loading, and reduced recombination losses, the hierarchical nanofibers yield 2.14% electrochemical conversion efficiency which is 50% higher than the efficiency obtained by plain nanofibers. 相似文献
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Hatameh Asgari Moghaddam Mohammad Reza Mohammadi 《Journal of the American Ceramic Society》2017,100(5):2144-2153
Different compositions of TiO2–BaTiO3 nanocomposites are synthesized with various weight ratios for dye‐sensitized solar cell (DSSC) applications. TiO2 and BaTiO3 nanoparticles (NPs) are synthesized by sol‐gel and solvothermal methods, respectively and are employed as the photoanode electrodes. BaTiO3 NPs have pure cubic perovskite crystal structure with an average size of 20‐40 nm, while TiO2 NPs show pure anatase phase with 15‐30 nm size. The power conversion efficiency (PCE) enhancement of the cells is first attained by controlling the thickness of the films for light harvesting improvement. The fabricated DSSC composed of pure BaTiO3 NPs with an optimal thickness of 25 μm shows efficiency of 6.83%, whereas that made of pure TiO2 NPs with 14 μm thickness has cell efficiency of 7.24%. Further improvement of cell efficiency is achieved by preparation of binary oxide nanocomposites using TiO2 and BaTiO3 NPs with various weight ratios. The highest PCE of 9.40% is obtained for the nanocomposite with TiO2:BaTiO3=85:15 (wt%). The enhancement is assigned to less recombination of photo‐generated electrons and higher incident photon to current conversion yield as a result of rapid charge collection and higher dye sensitization. 相似文献
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M.M. Rashad A.E. Shalan Mónica Lira-Cantú M.S.A. Abdel-Mottaleb 《Journal of Industrial and Engineering Chemistry》2013,19(6):2052-2059
Titania (TiO2) nanoparticles have been synthesized using organic precursor technique. The titania nanoparticles were characterized. The results indicated that the prepared titanium oxalate and citrate precursors were transformed to anatase TiO2 phase at temperature 400 °C for 2 h. Dye-sensitized solar cells were assembled using the prepared nanocrystalline TiO2 with large surface area. The specific surface area SBET was 80.9 and 78.6 m2/g using oxalic and citric acids, respectively. The power efficiency was 3.5 and 2.4%. A brief discussion on the possible reasons behind the low power conversion efficiency observed for these type of solar cells was reported. 相似文献