本文選題：纖維素納米纖維 + 層層自組裝��； 參考：《北京理工大學(xué)》2014年碩士論文

【摘要】：纖維素納米纖維（CNFs）具有優(yōu)良的透明性，良好的柔性以及很低的熱膨脹系數(shù)，這使其成為潛在的可以用于制備柔性超級(jí)電容器電極的材料，本論文論證了以CNFs膜為基材，以聚3，4-乙烯二氧噻吩：聚苯乙烯磺酸鈉（PEDOT:PSS）或還原氧化石墨烯（RGO）為導(dǎo)電層，以聚苯胺（PANI）為電致變色層，采用層層自組裝法和原位聚合法制備柔性透明薄膜電極的可行性，免去了傳統(tǒng)柔性基體在進(jìn)行層層自組裝時(shí)要進(jìn)行表面處理的復(fù)雜過(guò)程。通過(guò)對(duì)薄膜電極及使用這些電極制備的超級(jí)電容器的表征，分析了不同電極及柔性電致變色超級(jí)電容器的性能特征，闡述了電極微觀結(jié)構(gòu)對(duì)電解質(zhì)離子的擴(kuò)散乃至超級(jí)電容器的電性能的影響規(guī)律。 以CNFs膜、PANI、PEDOT:PSS分散液為原料，采用層層自組裝方法制備的CPP-n電極光學(xué)透明度高，表面均勻，但是薄膜結(jié)構(gòu)致密，不利于電解質(zhì)離子的傳輸。利用CPP-8電極制備的超級(jí)電容器S-PP-8雖然整體的電化學(xué)性能并不十分理想，但是其光學(xué)透明度高，在550nm處透光率達(dá)到47.1%，可以發(fā)生明顯的電致變色現(xiàn)象。 以CNFs膜、PANI、氧化石墨烯（GO）分散液為原料，采用層層自組裝方法制備的CPG-n復(fù)合膜，經(jīng)過(guò)HI處理后，得到CPRG-n復(fù)合膜，其表面均勻，結(jié)構(gòu)疏松，有利于電解質(zhì)離子的傳輸。利用CPRG-8電極制備的超級(jí)電容器S-PG-8受到RGO的影響，其透明度不理想，在550nm處的透光率為30.6%，難以直接觀察到電致變色現(xiàn)象，但是其兼有雙電層和贗電容超級(jí)電容器的優(yōu)點(diǎn)，性能穩(wěn)定且單位面積電容較大。 研究還采用層層自組裝法制備CNFs/RGO5薄膜，然后利用原位聚合法制備CRGP薄膜電極，結(jié)果表明，，薄膜表面不均勻，但是疏松多孔，有利于電解質(zhì)離子的傳輸。利用CRGP電極制備的超級(jí)電容器S-RGP在2mV·s-1的掃描速率下單位面積電容達(dá)到19.76mF·cm-2，但其透明性低，在550nm處的透光率只有16.8%。 進(jìn)一步利用層層自組裝法制備CNFs/[Cu2+-GO]5/[PANI-PEDOT:PSS]10復(fù)合膜，并采用HI將其還原后得到CRGPP-10薄膜電極，其表面均勻，但是結(jié)構(gòu)致密，不利于電解質(zhì)離子的傳輸。由于RGO的存在，利用CRGPP-10電極制備的超級(jí)電容器S-RGPP的電化學(xué)性能明顯優(yōu)于S-PP-8，其透明性較好，在550nm處的透光率為37.8%。
[Abstract]:Cellulose nanofiber (CNFs) has excellent transparency, good flexibility and low thermal expansion coefficient, which makes it a potential material for the preparation of flexible supercapacitor electrodes. The feasibility of preparing flexible transparent thin film electrode by layer self-assembly and in-situ polymerization using poly (3-triethylenedioxythiophene): sodium polystyrene sulfonate (PEDOT: PSS) or reduced graphene oxide (RGOO) as conductive layer and Polyaniline (pan) as electrochromic layer was studied. It eliminates the complex process of surface treatment for conventional flexible matrix during layer by layer self-assembly. The characteristics of different electrodes and flexible electrochromic supercapacitors were analyzed by the characterization of thin film electrodes and supercapacitors prepared with these electrodes. The effect of electrode microstructure on the diffusion of electrolyte ions and the electrical properties of supercapacitors is described. The CPP-n electrode prepared by layer self-assembly method has high optical transparency and uniform surface, but the structure of the CPP-n electrode is dense, which is not conducive to the transport of electrolyte ions. Although the overall electrochemical performance of the supercapacitor S-PP-8 prepared by CPP-8 electrode is not very ideal, its optical transparency is high, the transmittance reaches 47.1 at 550nm, and obvious electrochromic phenomenon occurs. CPG-n composite membrane was prepared by layer self-assembly method from the dispersion of CNFs (PANIO). After HI treatment, CPRG-n composite film was prepared. The CPRG-n composite film was obtained with uniform surface and loose structure, which was beneficial to the transport of electrolyte ions. The S-PG-8 supercapacitor prepared by CPRG-8 electrode is affected by RGO, and its transparency is not ideal. The transmittance at 550nm is 30.6. it is difficult to observe electrochromic phenomenon directly, but it has the advantages of double electric layer and pseudo-capacitor supercapacitor. Stable performance and larger capacitance per unit area. CNFs / RGO5 thin films were prepared by layer-by-layer self-assembly method, and CRGP thin film electrodes were prepared by in-situ polymerization. The results show that the surface of the films is uneven, but porous, which is conducive to the transport of electrolyte ions. The supercapacitor S-RGP prepared by using CRGP-electrode has a unit area capacitance of 19.76mF cm-2 at the scanning rate of 2mV s-1, but its transparency is low, and the transmittance at 550nm is only 16.8%. Furthermore, CNFs / [Cu2-GO] 5 / [PANI-PEDOT: PSS] 10 composite films were prepared by layer-by-layer self-assembly method. CRGPP-10 thin film electrode was prepared by HI reduction. The CRGPP-10 thin film electrode was uniform in surface, but compact in structure, which was not conducive to the transport of electrolyte ions. Because of the existence of RGO, the electrochemical performance of supercapacitor S-RGPP prepared by CRGPP-10 electrode is obviously better than that of S-PP-8, and the transparency of S-RGPP is better than that of S-PP-8. The transmittance of S-RGPP at 550nm is 37.8%.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM53;TB383.2

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本文編號(hào)：2047823