摘要
纯聚偏氟乙烯-六氟丙烯共聚物(PVDF-HFP)基凝胶电解质常常受制于低离子电导率,阻碍了其在染料敏化太阳电池(dye-sensitized solar cells,DSSCs)中的应用。而利用纳米填充可提高凝胶电解质离子电导率及凝胶电解质DSSCs的性能。本文使用功能化的多壁碳纳米管(f-MWCNT)作为PVDF-HFP凝胶电解质的纳米填充物,通过改变f-MWCNT的质量分数来研究其对电解质的离子电导率和离子扩散的影响,进而研究其对DSSCs的转化效率和长期稳定性的增强作用。研究发现:质量分数0.5%的f-MWCNT明显提高了 PVDF-HFP 凝胶电解质的离子电导率和离子扩散系数。并且,该凝胶电解质基DSSCs的光转换效率可达5.28%,相比于未填充的PVDF-HFP凝胶电解质基DSSCs(4.01%),其效率提高了31.7%。 42 d后,该电池依然可以保持最初转化效率的86.5%。实验结果证实了f-MWCNT在纳米填充方面的巨大潜能,为采用纳米填充物提高凝胶电解质DSSCs的性能提供参考。
Gel electrolyte based on pure polyvinylidene fluoride-six fluoropropene copolymer(PVDF-HFP) often suffers from low ionic conductivity, which hinders its application in dye-sensitized solar cells(DSSCs). However, the ionic conductivity of gel electrolyte and the conversion efficiency of the DSSCs can be enhanced by nanofillers. In this paper, we employed functionalized multi-walled carbon nanotube(f-MWCNT) as the nanofiller in the gel electrolyte based on PVDF-HFP. We studied its effect on ionic conductivity and ionic diffusion of electrolytes via changing the mass fraction of f-MWCNT, and investigated its improvement on the conversion efficiency and long-term stability of DSSCs. It was found that the PVDF-HFP gel electrolyte with 0.5% f-MWCNT significantly increased the ionic conductivity and ionic diffusion coefficient of the electrolyte. Moreover, the optimal conversion efficiency of the DSSCs with gel electrolyte reaches to 5.28%, which is 31.7% higher than that of the DSSCs with unfilled gel electrolyte(4.01%). After 42 days, the DSSCs still maintained 86.5% of the original conversion efficiency. The experiment confirms the great potential of f-MWCNT as the nanofiller, providing a reference for the study to improve the performance of the gel electrolyte DSSCs by nanofillers.
作者
盛磊
李廷鱼
郭丽芳
李刚
张文栋
SHENG Lei;LI Tingyu;GUO Lifang;LI Gang;ZHANG Wendong(MicroNano System Research Center & Key Laboratory of Advanced Transducers and Intelligent Control System(Ministry of Education),College of Information and Computer,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《应用化学》
CAS
CSCD
北大核心
2019年第7期815-822,共8页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(61674113,51622507,61471255)
山西省自然科学基金(2016011040)
山西省高等学校科技创新计划(2016138)资助项目~~