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標題: | 探討高分子離子液體於電致色變元件及聚紫精衍生物應用於自驅動光電致變色元件 On the Use of Polymeric Ionic Liquid for Electrochromic Devices and the Use of Poly(Viologen) Derivative for Self-powered Photovoltachromic Devices |
作者: | 林韋佑 Wei-You Lin |
指導教授: | 何國川 Kuo-Chuan Ho |
關鍵字: | 電致色變元件,電化學石英晶體微天平,離子累積,高分子離子液體,聚(紫精),紫精,半透明蓋態礦太陽能電池,獨立驅動智能窗, electrochromic devices,EQCM,ion-accumulation,poly(ionic liquid),poly(viologen),viologen,semi-transparent perovskite solar cell,self-powered smart windows, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 近年來,由於人們意識到全球暖化的危害,具有良好長期穩定性及多功能的電致變色元件(ECD)受到高度的關注。紫精衍生物被認為是有前途的電致變色材料(ECM)因為有高光學對比度和低能耗的特性。為了最大化地發揮ECD的性能,首先我們研究了電化學反應在電極表面的影響,並使用PIL提高了膠態電解質ECD的穩定性和光學性能;由於利用混合型的ECD可以減少電極表面的離子積累,我們進一步結合半透明太陽能電池製造整合型的獨立驅動ECD,從而實現零能耗智能窗的應用。
在第 3 章裡,我們研究了離子液體 (IL)電解質在電極表面上陽離子 [BMIM]+ 的累積效應。 此研究表明了電致變色元件中的表面電化學反應和光學特性受到 IL的陽離子在電極表面的吸附,導致電荷轉移電阻增加,進而造成電化學反應不良。在此,我們試圖透過烷基紫精的衍伸物組成一體式膠態電解質來解決這個問題,該電解質包含高分子離子液體 poly(vinylidene fluoride-co-difluorovinylidene aminooxoethyl-1-butylimidazolium-co-vinylidene aminooxoethyl-1-butylimidazolium tetrafluoroborate)(表示為 PIL)。基於 PIL 的 ECD 表現出顯著改善的性能,這是由於高分子聚合物主鏈上固定的 IL 陽離子防止了電極表面上的積累並提供電解質中更好的功能化結構。特別是ECD (5PIL-BrBzV/Fc)的性能提升是透過高導離度(21.45 mS/cm)、增加的穿透度變化(605 nm 處的 ΔT = 74.0%)和出色的長期穩定性(在20,000 圈循環後維持98.0%的ΔT)。這些研究的發現表明了當使用PIL於 ECD 配置時可以提供改進的電化學和光學特性。 在第 4 章中,使用半透明鈣鈦礦 (ST-PVSK) 太陽能電池收集近紫外線 (near-UV) 和紫外線 (UV)的光子,用以提供足夠的能量來驅動整合式配置的電致變色系統是新世代的策略。與傳統並排配置的設備不同在於不透明的太陽能電池限制了空間的使用,因此不適合應用在智能窗戶。在此,具有不同鹵化物比例的全無機鈣鈦礦層提供了 70.0% 以上的高平均可見光穿透度(AVT),並且還優化了聚(紫精)的薄膜厚度作為陰極著色材料,以實現獨立驅動電致色變元件的反應機制。結果表明,以 ST-PVSK3 作為太陽能電池並搭配混合型電致變色系統的獨立驅動光伏變色元件(PVCD)在波長為567 nm的穿透度變化為 53.1%,最大ΔAVT 為32.6%,以及快速的著去色時間。ST-PVSK和ECD的結合了通過陽光的驅動來降低能耗的應用中發揮了相當大的作用。 In recent years, electrochromic devices (ECDs) with good long-term stability and multi-function have great attention since people are aware of the dangers of global warming. Viologen-derivates are regarded as promising electrochromic materials (ECMs) due to their high optical contrast and low energy consumption characteristics. To maximize improvement of the performance of the utilized ECDs, in the beginning, we investigate the effect of electrochemical reaction on the electrode surface and use PIL to improve the stability and optical property in gel electrolyte ECD; Since utilized the hybrid type ECD could reduce the ion accumulation on the electrode surface, we further incorporate the semi-transparent solar cells to fabricate the monolithic integrated self-powered ECDs thereby realizing the application of zero-energy consumption smart windows. In Chapter 3, these studies have revealed that the surface electrochemical reaction and optical properties in ECDs suffer from the adsorption of the ionic liquid’s (IL’s) cations on the electrode surface which causes an increase in the charge transfer resistance, thus leading to a poor electrochemical reaction at the electrode surface. Herein, we attempt to address this issue through an alkyl viologen based all-in-one gel electrolyte containing a poly(ionic liquid) (PIL, poly(vinylidene fluoride-co-difluorovinylidene aminooxoethyl-1-butylimidazolium-co-vinylidene aminooxoethyl-1-butylimidazolium tetrafluoroborate). The PIL-based ECD exhibited the greatly improved performance due to the immobilized IL’s cations [BMIM]+ on the polymer backbone, thus preventing their accumulation on the electrode’s active area and facilitating better functional architecture in the electrolyte matrix. The flagship improvement in a particular PIL-based ECD (5PIL-BrBzV/Fc) was realized through high ionic conductivity (21.45 mS/cm), increased transmittance change (ΔT = 74.0% at 605 nm) and remarkable long-term stability (98% ΔT-retention after 20,000 cycles). The obtained findings of this work suggest that the replacement of conventional IL’s with PIL could deliver greatly improved electrochemical and optical properties in gel electrolyte-based ECD. In Chapter 4, harvesting ultraviolet (UV) and near-UV photons using semi-transparent perovskite (ST-PVSK) solar cells to provide enough energy to drive electrochromic systems in monolithically integrated configurations is a new generation strategy. Unlike traditional devices that providing side-by-side configuration, they limited the use of space due to opaque solar cells unsuitable for innovative window applications. Here, the all-inorganic perovskite layers with different ratio of halides provide highly average visible transmittance (AVT) above 70.0% and present the optimization of thickness of poly(viologen) as a thin-film playing cathodic coloring material to realize the self-powered ECD working mechanism during the electrochemical reaction. The results show that the self-powered photovoltachromic device (PVCD) with ST-PVSK3 as a solar cell integrated with a hybrid electrochromic system leads to a transmittance change of 53.1% at 567 nm, the highest ΔAVT of 32.6% (from AVTb of 60.3% to AVTc of 27.7%), and the fast response time toward the coloring and bleaching process. The combination of ST-PVSK and ECD plays a considerable role in reducing energy consumption applications driven by sunlight. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88707 |
DOI: | 10.6342/NTU202302665 |
全文授權: | 未授權 |
顯示於系所單位: | 化學工程學系 |
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