| Summary: | 碩士 === 逢甲大學 === 材料科學與工程學系 === 102 === The goal of this study is to develop a nanocomposite consisting of thermally reduced graphene oxide (rGO) with highly dispersed manganese oxide (Mn3O4) as electrodes for supercapacitor applications. Firstly the high purity graphene oxide (GO) nanoparticles was produced by Hummers’ method. Then rGO powder with high specific surface area was achieved by thermal reduction route in nitrogen atmosphere. The optimized specific surface area of rGO powder, which was enlarged by increasing the thermal reduction temperature, was 658.55 m2/g at 1,100oC to be used as matrix by doping Mn3O4 nanopowders. The results of SEM and TEM analyses on rGO/Mn3O4 nanocomposite containing 58 wt% Mn3O4 additive showed that Mn3O4 particles were uniformly and dispersed on the surfaces of the interlayers of rGO matrix. The scanning rate of 25 mV/s was performed in the cyclic voltammetry (CV) for both rGO (thermally reduced at 1100oC) and rGO/Mn3O4 submerged in a Na2SO4 (1 M) electrolyte, respectively. The specific capacitance of rGO sample was 78.18 F/g, as opposed to 133.95 F/g for rGO/Mn3O4 (58 wt%) sample. It was confirmed that addition of Mn3O4 in rGO matrix does increase specific surface area of rGO/Mn3O4 composite and subsequently the performance of rGO/Mn3O4 supercapacitor was improved.
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