| Summary: | 碩士 === 逢甲大學 === 綠色能源科技碩士學位學程 === 100 === There are five research aspects in this study including (a) prepration of graphene oxide (GO) by Hummer’s method, (b) prepration of thermally reduced graphene oxide (TRGO)with raising the thermal decomposition temperature for GO, (c) surface mofication of multiwall carbon nanotubes (MWCNTs) by mixture of sulfuric acid and nitric acid (3:1 volume ratio) to form carboxylated multiwall carbon nanotubes (MWCNTs-COOH), (d) producing the a hybrid structure of TRGO intercalated with MWCNTs-COOH in the interlayer spacing via ultrasonic agitation, (e) manufacturing and characterization of a supercapacitor electrode using the prepared TRGO-MWCNT hybrid structure. The specific surface area of TRGO increased as an increase of temperature during thermal decomposition for GO, where carbon dioxide gas was generated and released. At decomposition temperature of 1100oC, the TRGO nanopowder contains the maximized specific surface area (568.1 m2/g) with average pore size of 17.5 nm, which is beneficial to fabricate better electrical double-layer capacitor (EDLC) by using mesopore structured TRGO. Under the same electrochemical testing conditions (1M H2SO4 electrolyte and scan rate of 100 mV/s), the optimized specific capacitance of EDLC using TRGO nanopowder was 41.95 F/g, as compared to 119.67 F/g using hybrid structured TRGO-MWCNT nanopowder, which clearly demonstrated a substantial improvement of increasing specific capacitinace. In sum, a straightforward, low-cost manufacturing process of graphene-based nanopowders was proposed, which has great application pontential for the developments and commercialization of next-generation supercapacitors.
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