本研究是著眼於發展高能量密度參雜氮之石墨烯超級電容器，且經過比電容以及電位窗的參數最佳化。利用簡易且有效率的微波輔助水熱法，來達到石墨烯的參雜與還原同步化。關於材料結構分析上，以下就化學分析以及電容行為做詳細探討。我們希望氮參雜進入石墨烯的晶格裡，藉由調整微波輔助水熱法中的溫度與時間來進行調控。關於氮參雜以及含氧官能基團方面之表現，也確實增強在雙層結構的電容器上，也比石墨烯氧化物還原態要來的優秀許多。因此氮參雜之石墨烯之Csp 值比石墨烯氧化物還原態高上大約兩倍。參雜氮之石墨烯在超級電容器的表現上是相當優秀的，可以藉由儀器分析的結果窺知一二，從電化學阻抗頻譜中得到相當小的等價串連電阻、高電子傳導率、離子擴散性佳、以及電荷遷移率高。因此，本研究闡明一個非對稱性的超級電容器，利用參雜氮之石墨烯當作陽極，利用SnO2-RGO 當作陰極，並且在濃度2M 的硫酸溶液裡。一般來說，非對稱性的超級電容跟對稱性超級電容相互比較，前者會有較高的能量密度。

This study has been focused on the development of high energy density of nitrogen-doped graphene (NDG)-based supercapacitor via optimizing the specific capacitance and potential window. Doping and reduction of graphene have been done simultaneously by facile and efficient method, microwave-assisted hydrothermal (MHT). The structural analysis, chemical analysis and capacitive behavior have been discussed in detailed. The desirable N-dopant within graphene lattice could be tuned by controlling the temperature and time of MHT. The presence of the N-dopant and remaining of oxygen-functional groups could be enhanced the double layer capacitance higher than reduced graphene oxide (RGO). Therefore, the Csp value from NDG is around two times larger than RGO. NDG also has excellent performance of supercapacitor by showing the high electrical conductivity that was shown from EIS analysis with small value of equivalent series resistance (ESR), good ionic diffusion, and good charge transfer (small contact resistance). This study also demonstrated an asymmetric supercapacitor by utilizing the NDG as anode and SnO2-RGO as cathode in 2 M H2SO4 aqueous electrolyte. Generally, the asymmetric supercapacitor showed higher energy density compares with symmetric supercapacitor.

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