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聚乙烯醇缩醛基准固态电解质及其在染料敏化太阳能电池中的应用
Polyvinyl Acetal-based Quasi-Solid-Sate Electrolytes and Their Application in Dye-sensitized Solar Cells

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文摘 采用聚乙烯醇缩甲醛(PVF)与聚乙烯醇缩丁醛(PVB)2种聚乙烯醇缩醛类聚合物制作了准固态电解质并应用在了染料敏化太阳能电池上.利用红外光谱,热力学及电化学的方法对聚合物及聚合物电解质进行了表征,结果表明聚合物中C O及O—C—O基团可以通过氧原子与锂离子相互作用促进Li I的电离.PVB中丙基侧链对其热力学及电化学性能有显著的影响.通过对电解质组成进行优化,PVF和PVB基电解质的电导率分别达到2.5 m S·cm~(-1)及4.2 m S·cm~(-1),极限扩散电流分别为10.05 m A·cm~(-2)(扩散系数为1.84×10-6cm~2·s~(-1))和17.89 m A·cm~(-2)(扩散系数为3.23×10~(-6)cm~2·s~(-1)).PVF及PVB基准固态染料敏化太阳能电池分别达到了4.18%和6.06%的光电转化效率,并展现了良好的稳定性.
其他语种文摘 Polyvinyl formal (PVF) and polyvinyl butyral (PVB) as polymer frameworks are used to prepare quasi-solid-state electrolytes loaded with I2 and LiI,which are further applied in dye-sensitized solar cells(DSCs) to improve the stability of DSCs. FTIR spectra, thermodynamic and electrochemical methods are used to characterize the functional group of the polymers and the conductivity of the quasi-solid-state electrolytes. These results show that the oxygen atoms of C= O and O—C—O in the polymers (PVF and PVB) can interact with Li + of LiI by coordination effect,promoting the ionization of LiI and facilitating the charge transport. Through the comparison between PVF and PVB, it can be also found that the propyl side chain of PVB has positive influence on the thermodynamic and electrochemical performance,where the DSCs with PVB exhibit better photovoltaic performance. By optimizing the composition of electrolytes, the ionic conductivity of PVF and PVB-based quasi-solid-state electrolytes can reach the maximum ionic conductivity of 2.5 mS·cm~(- 1)(PVF) and 4.2 mS·cm~(- 1) (PVB),with the concentration of LiI at 0.7 mol·L~(-1). Under this condition, the diffusion-limiting current density of PVF and PVB-based quasi-solid-state electrolytes can achieve 10.05 mA·cm~(-2) (triiodide ionic diffusion constant = 1.84 × 10~(-6) cm~2·s~(- 1)) and 17.89 mA·cm~(- 2) (triiodide ionic diffusion constant = 3.23 × 10 - 6 cm2·s - 1), respectively. Impedance plots of the quasi-solid-state DSCs reflect that the PVB-based DSCs have a higher charge-transport resistance (R_(ct) = 118.9 Ω) than that of PVF-based DSCs (R_(ct) = 49.57 Ω) and effectively suppress the dark reaction due to the steric hindrance of the propyl side chain. Eventually, the dye-sensitized solar cells based on these two electrolytes attain satisfactory energy conversion efficiency of 4.18% (PVF) and 6.06% (PVB) and excellent long-term stability,which renders only a tiny decline of the efficiency of DSCs and maintain the efficiency of DSCs at above 90% of the original values.
来源 高分子学报 ,2016(12):1735-1742 【核心库】
DOI 10.11777/j.issn1000-3304.2016.16188
关键词 聚乙烯醇缩甲醛 ; 聚乙烯醇缩丁醛 ; 电解质 ; 电导率 ; 染料敏化太阳能电池
地址

中国科学院广州能源研究所, 中国科学院可再生能源与天然气水合物重点实验室;;广东省新能源与可再生能源重点实验室, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 1000-3304
学科 化学
基金 太阳能光热先端材料工程技术中心项目 ;  广东省特支计划项目 ;  粤港联合创新项目 ;  国家自然科学基金 ;  广东省科技计划项目
文献收藏号 CSCD:5853973

参考文献 共 33 共2页

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引证文献 1

1 郑旭莹 聚乙烯醇链接二苯并18冠6构筑燃料电池用阴离子导电膜的研究 现代化工,2018,38(12):109-113
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