Journal
CARBOHYDRATE POLYMERS
Volume 200, Issue -, Pages 381-390Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.08.016
Keywords
Monolith; Phase-separation; Activated carbon; Network structure; Electrode; Capacitance
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Funding
- Japan Society for the Promotion of Science [16K14081, 17H03114]
- Hundred Talents Program, Shaanxi Province, PR China
- Department of Science and Technology-Science and Engineering Research Board (DST-SERB), New Delhi, India [SB/FT/CS-004/2014]
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Bacterial cellulose (BC) gel is synthesized by static culture process at the interface between air and medium. The solvent-exchanged BC gel is incorporated into polyacrylonitrile (PAN) copolymer solution under heating at 90 degrees C and subsequent cooling gives bacterial cellulose-polyacrylonitrile composite (BC-PAN) monolith. The BC-PAN monolith is carbonized at 1000 degrees C with physical activation in the presence of CO2 to obtain the activated carbon monolith, BC-PAN-AC, with large surface area and high microporosity. Unique morphologies are observed for BC gel which is propagated to the BC-PAN monolith and restored in BC-PAN-AC. The BC nanofibers remain entwined throughout the porous skeleton of the PAN backbone and the entangled structure helps in retaining the continuity of the matrix of BC-PAN-AC and reduce the grain boundary impedance for electrical conduction. Cyclic voltammetry shows that these activated carbons are good electrode materials in electric double layer capacitors (EDLC) with capability of high-speed charging and discharging.
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