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首页> 外文期刊>Optical Materials >Synergistic effect of sodium and yeast in improving the efficiency of DSSC sensitized with extract from petals of Kigelia Africana
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Synergistic effect of sodium and yeast in improving the efficiency of DSSC sensitized with extract from petals of Kigelia Africana

机译：钠和酵母的协同作用，可提高非洲菊花瓣提取物敏化的DSSC的效率

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摘要

TiO2 nanostructures with two different dopants, sodium and yeast have been successfully synthesized by hydrothermal method. Doping sodium is found to extend the absorbance of TiO2 into the visible region as well as it acts as mordant in fixing and improving the absorption of dye. Yeast, as a dopant, can help in absorption of more anthocyanins from the natural dye extract by TiO2 and also aids in retaining the colour of the dye and increases the stability of the dye at varying pH. Anthocyanins are the major class of pigment present in the newly addressed maroon, velvety and trumpet shaped flower "Kigelia Africana". X-ray diffraction analysis revealed the formation of rutile phase for all the samples. Field Emission Scanning Electron microscopy images revealed the formation of nanorods and nanoflowers with change in dopant as well as their concentration. The photoelectric conversion efficiency of DSSC with undoped TiO2 photoelectrode is 0.87% and DSSC with 6% Na doped TiO2 photoelectrode is 1.56%. The efficiency of DSSC with 6% Na + 6% yeast doped TiO2 photoelectrode is found to increase from 2.09% (DSSC with 6% Na + 4% yeast doped TiO2 photoelectrode) to 2.31% on varying the dopant concentration. Doping is also found to increase the dye absorption and superior charge transport efficiency which in turn helps to improve the performance of DSSC.
机译：通过水热法成功地合成了具有钠和酵母两种不同掺杂剂的TiO2纳米结构。发现掺杂钠可将TiO2的吸收性扩展到可见光区域，并且在固定和改善染料吸收方面起着重要的作用。酵母作为掺杂剂，可以帮助天然染料提取物中TiO2吸收更多的花色苷，还有助于保留染料的颜色并提高染料在不同pH值下的稳定性。花色苷是新近出现的栗色，天鹅绒般和喇叭形花“非洲非洲菊”中的主要色素。 X射线衍射分析表明所有样品均形成金红石相。场发射扫描电子显微镜图像显示，随着掺杂剂及其浓度的变化，纳米棒和纳米花的形成。未掺杂的TiO2光电电极的DSSC的光电转换效率为0.87％，而6％的Na掺杂的TiO2光电电极的DSSC的光电转换效率为1.56％。发现在掺杂剂浓度不同的情况下，含6％Na + 6％酵母的TiO2光电极的DSSC效率从2.09％（含6％Na + 4％的酵母的TiO2光电极的DSSC）提高到2.31％。还发现掺杂可以提高染料吸收率和优异的电荷传输效率，进而有助于改善DSSC的性能。

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