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One-pot synthesis of MnO<sub>2</sub>/reduced graphene oxide composites for supercapacitor electrodes
변상철,김석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Manganese Dioxide (MnO<sub>2</sub>)/Reduced graphene oxide(RGO) composites were prepared by a facile solvothermal synthesis. The improved electrochemical performance is obtained by both the MnO<sub>2</sub> nanoparticles (100~200nm) that offer large accessible surface area and the hydrous functional groups on reduced graphene oxide that facilitate transport of electrolyte ion and electron. These MnO<sub>2</sub>/RGO composites with high specific capacitance are promising electrode materials for supercapacitors. Electrochemical behaviors were characterized by cyclic voltammetry (CV) and Galvanostatic charge-discharge Test in 1M Na<sub>2</sub>SO<sub>4</sub> aqueous electrolyte. The MnO<sub>2</sub>/RGO composites exhibited higher specific capacitance than the original component. The structure, morphology of the composites was examined by Scanning electron microscopy (FE-SEM) and FT-IR spectroscopy.
Electrochemical behavior of manganese oxide/graphene composites using various reducing agents
변상철,김석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Manganese Dioxide (MnO<sub>2</sub>)/Graphene composites were prepared by using variety of reducing agent Such as DMF(dimethyl formamide), Ethanol, Ethylene glycol was used to reducing potassium permanganate. According to reducing agent, MnO<sub>2</sub>/graphene composites exhibited different electrochemical characteristics. MnO<sub>2</sub>/graphene composite Prepared by ethanol showed higher specific capacitance than other composites. These properties are resulted from both their various structure and morphology of manganese oxide. The structure and morphology of the composites were examined by Field-emission Scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy(FT-IR). Electrochemical properties were characterized by cyclic voltammetry (CV) and Charge-Discharge Test in 1M Na<sub>2</sub>SO<sub>4</sub> aqueous electrolyte of 3-electrode system.
변상철,김회승,김석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Carbon nanotubes(CNTs) are materials with excellent flexibility, mechanical strength, and thermal conductivity. we prepared Polypyrrole (PPy) was coated on the surface of graphene nanosheets (GNS) and carbon nanotubes(CNTs) through in situ chemical oxidation polymerization of pyrrole monomers in the presence of graphene suspension in HCl solution. Enhanced electrochemical performance of the PPy-GNS-CNTs electrode could be due to increasing active sites for the deposition of polypyrrole provided by large surface areas of graphene nanosheets and the synergistic effect between polypyrrole and graphene oxide and multi-walled carbon nanotube. The morphology, structure and crystallinity of the composites were examined by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM). Electrochemical properties were characterized by cyclic voltammetry (CV) in 1M NaNO<sub>3</sub> electrolyte.