電聚合聚(3,4-乙烯基二氧噻吩)(PEDOT)/絲網印刷還原氧化石墨烯-殼聚醣(rGO-CS)雙層軟性超級電容

Electropolymerized poly(3,4-ethylenedioxythiophene) (PEDOT)/screen-printed reduced graphene oxide-chitosan (rGO-CS) bilayer flexible supercapacitors

曾家暉(Chia-Hui Tseng)

指導教授 ： 陳建彰

國立臺灣大學/工學院/應用力學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202101609

摘要

本研究利用電化學聚合導電聚合物聚(3,4-乙烯基二氧噻吩)(PEDOT)與絲網印刷還原氧化石墨烯(rGO)-殼聚醣(CS)複合材料於碳纖維布上作為超級電容之電極材料，並應用於軟性超級電容之製造。在實驗中，通過掃描式電子顯微鏡(SEM)觀察到不同聚合條件下聚(3,4-乙烯基二氧噻吩)之形貌變化，並藉由X射線光電子能譜儀(XPS)分析電極表面聚(3,4-乙烯基二氧噻吩)的化學鍵結組成。然後透過比表面積分析儀與水接觸角量測可發現在沉積聚(3,4-乙烯基二氧噻吩)後的碳纖維布具有高比表面積與親水性。此特性有助於超級電容之擬電容(PC)和電雙層電容(EDLC)的貢獻，並可以改善凝膠電解質與電極之間的接觸，進而提升了電容性能。PEDOT/rGO-CS軟性超級電容在掃描速率為2 mV/s之循環伏安法量測，所得到的最大面積比電容值為536.84 mF/cm2。此外，在不同曲率的彎曲狀態下，PEDOT/rGO-CS軟性超級電容之面積比電容值保持相似的水準，呈現優異的可撓性與機械穩定性；而軟性超級電容經10000次循環伏安法充放電量測後，電容保持率為102%，表示此軟性超級電容具有良好的電化學穩定性。

關鍵字

電化學聚合 ； 聚(3,4-乙烯基二氧噻吩) ； 還原氧化石墨烯 ； 殼聚醣 ； 碳纖維布 ； 軟性超級電容

並列摘要

In this study, electrochemically polymerized conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) and screen printing reduced graphene oxide (rGO) -chitosan (CS) composites on carbon fiber cloth were used as the electrode material of flexible supercapacitors. The morphologies of poly(3,4-ethylenedioxythiophene) under different polymerization conditions were observed by scanning electron microscope (SEM), and the chemical bonding composition of poly(3,4-ethylenedioxythiophene) on the electrode surface was analyzed by X-ray photoelectron spectroscopy (XPS). In addition, the surface area analyzer and water contact angle measurements showed that the carbon fiber cloth deposited with poly(3,4-ethylenedioxythiophene) had high specific surface area and hydrophilicity. This property was conducive to the contribution of pseudocapacitance (PC) and electrochemical double layer capacitance (EDLC) of supercapacitor, and could improve the contact quality between the gel-electrolyte and the electrode, thereby enhancing the capacitive performance. Cyclic voltammetry (CV) under a potential scan rate of 2 mV/s revealed that a maximum areal capacitance of 536.84 mF/cm2 was achieved. In the bending state of different curvature, the areal capacitance of PEDOT/rGO-CS flexible supercapacitor kept similar level, showing excellent flexibility and mechanical stability. A 10000-cycle CV test showed a capacitance retention rate of 102% under a potential scan rate of 200 mV/s, indicating good electrochemical stability.

並列關鍵字

electropolymerization ； PEDOT ； reduced graphene oxide ； chitosan ； carbon cloth ； flexible supercapacitor

參考文獻

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