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阴极修饰对染料敏化TiO_2太阳能电池性能的改进 总被引:13,自引:0,他引:13
通过对染料敏化TiO2纳米晶太阳能电池中阴极进行修饰来提高电池的光电性能。结果表明:在阴极表面镀上具有催化性能的白金、镍或石墨均可提高电池的光电转化效率(IPCE)、短路电流、开路电压和填充因子等性能。其中白金修饰阴极后,电池的性能较好,IPCE从7.59%升至48.32%,短路电流从0.91 mA升至7.23 mA,开路电压从478 mV升至571 mV以及填充因子从0.09升至0.47。并给出用UV—3100型紫外可见分光光度计测定染料RuL2(SCN)2溶液的吸收光谱。 相似文献
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以2-巯基吡啶(PySH)为氧化还原活性介质,以聚乙烯醇(PVA)为聚合物基体,采用溶液共混法制备了PVA-H2SO4-PySH凝胶电解质,研究了PySH添加量对凝胶电解质离子电导率的影响,并组装了活性炭电极超级电容器,利用循环伏安、恒流充放电、交流阻抗谱和自放电等测试对超级电容器电化学性能进行了表征。结果表明,PySH的引入提高了凝胶电解质的离子电导率,同时也改善了超级电容器的电化学性能,在相同电流密度下,超级电容器电极比电容由137F/g提高为394F/g,能量密度由3.6Wh/kg提高到12.4Wh/kg,经过3000次充放电循环后比电容保持率为89%。 相似文献
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Novel, three-dimensional, flower-like Bi2O3/BiVO4 heterojunction photocatalysts have been prepared by the combination of homogeneous precipitation and two-step solvothermal method followed by thermal solution
of NaOH etching process. The as-obtained samples were fully characterized by X-ray diffraction, scanning
electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller surface area, and UV-vis diffusereflectance spectroscopy in detail. The crystallinity, microstructure, specific surface area, optical property and
photocatalytic activity of samples greatly changed depending on solvothermal reaction time. The photocatalytic
activities of samples were evaluated on the degradation of methyl orange (MO) under visible-light irradiation. The
Bi2O3/BiVO4 exhibited much higher photocatalytic activities than pure BiVO4 and conventional TiO2 (P25). The
result revealed that the three-dimensional heterojunction played a critical role in the separation of the electron and
hole pairs and enhancement of the interfacial charge transfer efficiency, which was responsible for the enhanced
photocatalytic activity. 相似文献
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通过低温液相法制备了二氧化锰-双壁碳纳米管(MnO2-DWCNTs)复合材料;通过溶胶-凝胶法制备了纳米二氧化钛-双壁碳纳米管(TiO2-DWCNTs)复合材料。将MnO2-DWCNTs作为正极,TiO2-DWCNTs作为负极并组装成不对称超级电容器,其性能比对称的MnO2-DWCNTs和TiO2-DWCNTs电容器的性能好,当正负极质量比为1:1时,不对称超级电容器的质量比电容最高,达到250.71F/g,能量密度达到了17.36 Wh/kg。 相似文献
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Hl-xSr2Nb3-xMox01o photocatalysts were synthesized using a microwave-irradiation-assisted ion- exchange reaction. The physicochemical properties of the photocatalysts were analyzed by field-emission scan- ning electron microscopy (FE-SEM), X-ray diffraction (XRD) and ultraviolet-visible spectroscopy (UV-vis). The photocatalytic activity of the Hl-xSr2Nb3-xMox01o was evaluated by degrading methyl orange (MO) dye under light irradiation from a 40-W mercury lamp. The results proved that the Mo doping amount had an important effect on the photocatalytic activity of the catalysts. The highest photoeatalytic activity was obtained when the doping amount was 15 mol%. Furthermore, the complex preparation process and lengthy time was simplified and shortened greatly. 相似文献