Bacterial cellulose as source for activated nanosized carbon for electric double layer capacitors |
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Authors: | Koon-Yang Lee Hui Qian Feng H. Tay Jonny J. Blaker Sergei G. Kazarian Alexander Bismarck |
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Affiliation: | 1. Polymer and Composite Engineering (PaCE) Group, Department of Chemical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ, London, UK 2. Vibrational Spectroscopy and Chemical Imaging Group, Department of Chemical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ, London, UK
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Abstract: | A nanosized carbonaceous material was derived from bacterial cellulose (BC). BC, which is produced by bacteria as nanosized material, possesses high degree of crystallinity of 90 %, was pyrolysed at 950 °C and physically activated with CO2 to produce a nanosized activated carbon material. The pyrolysis of BC yielded a carbonaceous material (carbon yield of between 2 and 20 %) with a relatively low D- to G-band ratio (between 2.2 and 2.8), indicating that the carbonaceous material possesses a graphitic structure. Two different BC materials were pyrolysed—a loose fibrous (freeze-dried) and dense paper form. It was observed that a carbon nanofibre-like material was produced by the pyrolysis of the loose fibrous form of BC. The electric double layer (EDL) capacitance and the area-normalised specific capacitance in K2SO4 solution were as high as 42 F g?1 and 1,617 F cm?2, respectively. The EDL capacitance was also compared to commercially available activated carbon (YP-50F). |
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