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Articles by Kee Suk Nahm
Total Records ( 2 ) for Kee Suk Nahm
  M.R. Jisha , Yun Ju Hwang , Jae Sun Shin , Kee Suk Nahm , Prem Kumar , K. Karthikeyan , N. Dhanikaivelu , D. Kalpana , N.G. Renganathan and A. Manuel Stephan
  Carbons derived by pyrolysis of coffee shells treated with ZnCl2 were used as electrode materials in symmetric electrochemical supercapacitors. Scanning electron microscopy showed that the carbon from the porogen-free shells show a flake-like structure, while those from the ZnCl2-treated coffee shells have a loose, disjointed structure with no definite shape. X-ray diffraction studies indicated the presence of small domains of coherent and parallel stacking of the graphene sheets. The average surface area of the carbon was 842 m2 g–1, with an average micropore area of 400 m2 g–1. Cyclic voltammetric studies suggested a specific capacitance of about 150 F g–1. Self-discharge studies on the devices showed a large retention time.
  G. Gnana Kumar , Pil kim , Ae rhan kim , Kee suk Nahm and R. Nimma Elizabeth
  Organic–inorganic hybrid membranes based on poly(vinylidene fluoride-co-hexa fluoropropylene) (PVdF-HFP)/sulfosuccinic acid were fabricated with different nanometer sizes of silica particles. Morphological images reveal the embedded ceramic filler over the membrane. Structural characterizations were made by FT-IR and XPS, ensure the inclusion of sulfosuccinic acid and silica into the PVdF-HFP polymer matrix. Sulfonic acid groups promote the IEC values and greater swelling behavior. Silica content in the hybrid membranes had a great effect on crystalline character as well as thermal properties of the membranes. Decrease in the filler size creates an effective route of polymer–filler interface and promotes the protonic conductivity of the membranes. The high conductivities in the range of 10–2 to 10–3 S cm–1 were achieved through synergistic interactions between the organic and inorganic moieties of the hybrid membranes. Due to these splendid features, the prepared hybrid membranes can be a trademark in the field of fuel cells.
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