本研究內容為合成與鑑定三維結構之石墨烯/奈米碳管複合材，並應用於燃料電池觸媒載體。合成方法為將石墨經氧化開層製備氧化石墨烯，再以含浸法製備鐵觸媒於氧化石墨烯上，經熱處理還原氧化石墨烯及鐵觸媒後，以石墨烯(TRGO)當作基板，藉由化學氣相沉積法並以乙炔當作碳源於石墨烯上直接成長奈米碳管，製備出三維結構石墨烯/奈米碳管之新穎複合碳材(TRGOCNT-X，X表示成長碳管的時間)，並控制不同成長碳管之時間，進一步探討與鑑定其特性與效能。
結果顯示，TRGOCNT-X的導電度達89.2~144.4 S/cm，與未成長碳管之TRGO (9.1 S/cm)相比，上升高達10~16倍，另外以TRGOCNT-X與石墨烯物理混摻(physical blending)奈米碳管(TRGOCNT-phy)相比，導電度均以TRGOCNT-X較高。觸媒方面，Pt/TRGOCNT-20具有最高之電化學活性表面積(77.39 m2/g Pt)，為商用品E-TEK(58.06 m2/g Pt)的1.3倍，更為Pt/TRGO的2.8倍，以及Pt/TRGOCNT-phy的2.1倍。在甲醇氧化反應方面，Pt/TRGOCNT-20之質量活性(Mass Activity)為E-TEK的1.2倍，更為Pt/TRGO的2.6倍，以及Pt/TRGOCNT-phy的1.9倍。在直接甲醇燃料電池(Single Cell Test)測試，Pt/TRGOCNT-20之最大功率高出E-TEK 26 %，也比Pt/TRGO與Pt/TRGOCNT-phy分別高出74 %與65 %。

The purpose of this research was to synthesize and analyze the three dimensional structure of graphene/carbon nanotubes(CNTs) composite, and this material will be used in fuel cell carbon support. Graphene oxide was synthesized by oxidation of graphite. Graphene oxide was then coated with Fe-catalyst with the method of impregnation. The graphene oxide was reduced with thermally, called thermally reduced graphene oxide(TRGO). Using the method of chemical vapor deposition(CVD), CNTs was grew between the layer in TRGO forming Graphene/CNTs composite. By controlling the time of the growth of CNT, different characteristics and performance will be further discussed and analyzed.
The conductivity of TRGOCNT-X approached to 89.2~144.4 S/cm, which is 10~16 times higher than TRGO, and higher than TRGO physical blending with CNTs (TRGOCNT-phy). We also prepare Pt catalyst by EG reduction method. Pt/TRGOCNT-20 showed the highest electrochemical active surface area (77.39 m2/g Pt), which is 30 % higher than E-TEK (58.06 m2/g Pt), and higher than TRGO (28.05 m2/g Pt) and TRGOCNT-phy (36.81 m2/g Pt). In single cell test, Pt/TRGOCNT-20 had the maximum power density (32.0 mW/cm2), which is 26 % higher than E-TEK (25.4 mW/cm2), and higher than TRGO (18.4 mW/cm2) and TRGOCNT-phy (19.4 mW/cm2). Compared with all electrochemical property, Pt/TRGOCNT-20 showed more potential for application of DMFCs.

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