本論文旨在研究氮摻雜(N-dope)石墨烯氣凝膠/碳纖維複合材料之電化學特性與電容去離子淨水技術(capacitive deionization, CDI)之開發，利用冷凍乾燥技術製備之氮原子摻雜石墨烯氣凝膠，石墨烯氣凝膠是一種三維結構材料，有良好的比表面積，其三維的立體結構可以降低層與層的堆疊效應進而提高電吸附容量，且藉由添加Polydopamine(PDA)與Polyethylenimine (PEI)摻雜氮原子提高碳材料電化學性能和表面性能並改善材料本身的疏水性與結構，本研究製備之氮原子摻雜(N-dope)石墨烯氣凝膠通過掃描式電子顯微鏡和X射線光電子能譜分析樣品的型貌結構及表面特性；另一方面將本研究所製備之氣凝膠複合材料塗佈在以回收複合材料中之碳纖維再製之碳紙作為電極，應用於電容去離子技術，藉由向電極施加低電壓產生正負極，使離子吸附於具相反電性的多孔電極的孔洞中，形成電雙層去除水中的鹽分，利用循環伏安法(cyclic voltammetry, CV)與交流阻抗分析法（Electrochemical impedance spectroscopy, EIS）評估複合材料的電化學性能，並研究不同樣品在電容去除離子過程中的脫鹽性能，結果表明燒結後之氮摻雜石墨烯氣凝膠(Anneal Gp@PEI/PDA)與其他樣品相比擁有較高的比電容特性60.44 F/g與脫鹽性能。

Capacitive deionization (CDI) is one of promising sea water desalination technology that attract more attention in recent years. In this research, we used carbon fiber nonwoven as substrate and coating with nitrogen-doped (N-dope) graphene aerogel composites. Graphene aerogels which obtain via freeze-drying provide good specific surface area due to its three-dimensional structure. The three-dimensional structure can reduce the layer-to-layer stacking effect and improve the electrical adsorption capacity. To enhance the electrochemical properties and structure stability of graphene aerogels, we introduce polydopamine (PDA) and polyethyleneimine (PEI) as nitrogen source to improve the conductivity, hydrophobicity and structure. The N-dope graphene aerogel prepared in this study that scanned by the scanning method electron microscopy and x-ray photoelectron spectroscopy used to analyze the morphology, structure and surface characteristics of the samples. Moreover, the recycled Carbon Fiber Reinforced Polymer of carbon paper was used as the substrate and coated by N-dope graphene aerogel to act as the electrode in capacitive deionization technology. We apply a low voltage to the electrode to generate positive and negative electrodes, so ions could be adsorbed in the oppositely charged porous electrode. An electric double layer would form, and ions could be removed from the salt solution. We use cyclic voltammetry (CV) and AC impedance analysis (Electrochemical impedance spectroscopy, EIS) to evaluate the electrochemical performance of the material, and study the desalination performance. The results show that the annealed nitrogen-doped graphene aerogel (Anneal Gp@PEI/PDA) has highest specific capacitance characteristics of 60.44 F/g and desalination performance.

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