Polymer-dispersed MWCNT gel electrolytes for high performance of dye-sensitized solar cells
Polymer-dispersed MWCNT gel electrolytes for high performance of dye-sensitized solar cells
复制标题
DOI：
10.1039/c2jm16131a
复制
发表时间：
2012-03
影响因子：
--
通讯作者：
Ying-Chiao Wang;Kuan-Chieh Huang;R. Dong;Chung-Te Liu;Chunchun Wang;K. Ho;Jiang-Jen Lin
中科院分区：
文献类型：
--
作者：
Ying-Chiao Wang;Kuan-Chieh Huang;R. Dong;Chung-Te Liu;Chunchun Wang;K. Ho;Jiang-Jen Lin
利用聚合物分散的多壁碳纳米管（MWCNT）的混合物与染料敏化太阳能电池（DSSC）中的凝胶电解质的常规组合物联网以有目的地提高电池效率。作为分散剂的必要聚合物在结构上针对其由聚（氧杂环丁烷）-嵌段酰胺和酰亚胺组成的官能度而定制。分散剂的存在是多功能的，用于首先解束最初聚集的MWCNT，随后与常规凝胶电解质聚（偏二氟乙烯-共-六氟丙烯）（PVDF-HFP）/LiI系统联网。将仅由0.25wt%的处于精细分散状态的MWCNT/POEM组成的凝胶电解质制成准固态DSSC，其在100 mW cm-2照射的测试中显示出6.86%的高功率转换效率（η）和15.3 mA cm-2的短路电流密度（JSC）。DSSC效率从具有JSC = 9.6mA cm-2和η = 4.63%的值的未改性凝胶电解质的使用显著提高。通过电化学阻抗谱分析，对最低的瓦尔堡电阻（Rw）进一步证实了这种增强。采用UV-Vis、TEM、FT-IR和DSC等手段对MWCNT在聚合物分散剂中的分散性进行了表征。这一发现表明MWCNT在无定形PVDF-HFP中的作用，并促进了I−/I3−离子对在该电解质体系中的扩散状态。
A hybrid of polymer-dispersed multi-walled carbon nanotubes (MWCNT) was utilized in networking with the conventional composition of gel electrolyte in dye-sensitized solar cells (DSSCs) to purposely enhance the cell efficiency. The requisite polymer as the dispersant is structurally tailored for its functionalities consisting of poly(oxyethylene)-segmented amides and imides. The existence of the dispersant is multi-functional for first de-bundling the originally aggregated MWCNT and subsequently networking with the conventional gel electrolyte, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF–HFP)/LiI system. The gel electrolyte comprised of only 0.25 wt% MWCNT/POEM in the finely dispersed state was fabricated into a quasi-solid-state DSSC which showed high power-conversion efficiency (η) of 6.86% and short-circuit current density (JSC) of 15.3 mA cm−2 at the test of 100 mW cm−2 irradiation. The DSSC efficiency was significantly improved from the use of the unmodified gel electrolyte having the values of JSC = 9.6 mA cm−2 and η = 4.63%. The enhancement was further confirmed by the electrochemical impedance spectra analyses for the lowest Warburg resistance (Rw). The fine dispersion of MWCNT in the polymeric dispersant was characterized by UV-Vis, TEM, FT-IR and DSC. The finding indicates the role of MWCNT for homogenizing the amorphous PVDF–HFP and facilitating the diffusion state of I−/I3− ion pairs in this electrolyte system.