Lee, K-Y; Qian, H; Tay, FH; Blaker, JJ; Kazarian, SG; Bismarck, A; (2013) Bacterial cellulose as source for activated nanosized carbon for electric double layer capacitors. Journal of Materials Science , 48 (1) 367 - 376. 10.1007/s10853-012-6754-y.

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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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