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- 저자 : Hansika, P.A.D. (검색결과 3 건)
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Hansika, P.A.D.,Perera, K.S.,Vidanapathirana, K.P.,Zainudeen, U.L. Techno-Press 2019 Advances in materials research Vol.8 No.1
Electrochemical double layer capacitors (EDLCs) which are fabricated using carbon based electrodes have been emerging at an alarming rate to fulfill the energy demand in the present day world. Activated charcoal has been accepted as a very suitable candidate for electrodes but its cost is higher than natural graphite. Present study is about fabrication of EDLCs using composite electrodes with activated charcoal and Sri Lankan natural graphite as well as a gel polymer electrolyte which is identified as a suitable substitute for liquid electrolytes. Electrochemical Impedance Spectroscopy, Cyclic Voltammetry and Galvanostatic Charge Discharge test were done to evaluate the performance of the fabricated EDLCs. Amount of activated charcoal and natural graphite plays a noticeable role on the capacity. 50 graphite : 40 AC : 10 PVdF showed the optimum single electrode specific capacity value of 15 F/g. Capacity is determined by the cycling rate as well as the potential window within which cycling is being done. Continuous cycling resulted an average single electrode specific capacity variation of 48 F/g - 16 F/g. Capacity fading was higher at the beginning. Later, it dropped noticeably. Initial discharge capacity drop under Galvanostatic Charge Discharge test was slightly fast but reached near stable upon continuous charge discharge process. It can be concluded that initially some agitation is required to reach the maturity. However, the results can be considered as encouraging to initiate studies on EDLCs using Sri Lankan natural graphite.
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Long-Term Investigation of Marine-Derived Aspergillus Diversity in the Republic of Korea
Jun Won Lee,Wonjun Lee,Rekhani Hansika Perera,Young Woon Lim 한국균학회 2023 Mycobiology Vol.51 No.6
Aspergillus species play a crucial role in terrestrial environments as degraders and are wellknown for producing various secondary metabolites. Recently, Aspergillus species have beendiscovered in marine environments, exhibiting adaptability to high salinity and producingdiverse secondary metabolites with valuable properties. However, limited research hasfocused on their marine diversity, leading to inaccurate species identification. The currentstudy addresses this gap by investigating diverse marine habitats in the Republic of Korea,including sediment, seawater, seaweed, and marine animals. From three coasts of theKorean Peninsula, 472 Aspergillus strains were isolated from the various marine habitats. Atotal of 41 species were accurately identified using multigenetic markers: internal transcribedspacer, calmodulin, and b-tubulin. The findings underscore the importance of accurate identificationand provide a basis for elucidating the functional role of marine-derived Aspergillusspecies in marine ecosystems.
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