Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 155, Issue -, Pages 131-141Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.03.202
Keywords
Chitosan; Carbon aerogels; Hierarchical porous; Pseudocapacitance; Supercapacitor
Funding
- National Natural Science Foundation of China [31700517]
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University)
- Ministry of Education of China [SWZ-MS201901]
- Qingdao Applied Basic Research Program [18-2-2-4-jch]
- China Postdoctoral Science Foundation [2019M652504]
- Talent Fund of Shandong Collaborative Innovation Center of Eco-Chemical Engineering [XTCXQN10]
- Taishan Scholar Project of Shandong Province [ts201511033]
- Special Fund from Postdoctoral Innovation Project of Shandong Province [201902039]
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Carbon aerogel with various morphology and structural characteristics were prepared from chitosan by freeze drying-carbonization/activation process. The carbon aerogel obtained without activation (CNS-800) exhibited sheet structure and disordered micropores, N mostly existing in the forms of N-5 and N-6 groups. After phosphoric acid activation (CNSP-800), a 3D-honeycomb structure with long-range ordered pore channels was presented, with N-X being themain nitrogen-containing groups, some P-O/P=O and P=C groups were also detected. KOH activation of CNS (CNSK-800) led to the formation of incomplete 3D-mesh structure and some graphite-like structure, which is the most unordered structure attributed to the high intense of KOH activation. All the samples showed micro-mesoporous structure, the specific surface area of CNS-800, CNSk-800 and CNSP-800 were 421, 1215 and 1475m(2)/g, respectively. When used as electrode in the three-electrode supercapacitor, the capacitance values of 171, 318 and 416 F/g were obtained at 1 A/g in 1M H2SO4 electrolyte for CNS-800, CNSK-800 and CNSP-800, with the pseudo capacitance contribution rates of 25.4%, 31.6% and 37.6% respectively. Additionally, the capacitance values were 98, 126 and 168 F/g in the two-electrode system respectively, and their energy densities reached 3.35, 4.69 and 6.36Wh/kg at a power density of 25 W/kg accordingly. (C) 2020 Elsevier B.V. All rights reserved.
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