College of Material Science and Engineering, Northeast Forestry University, Harbin, PR China; Research Center of Wood Intelligent Science, Northeast Forestry University, Harbin, PR China.
College of Material Science and Engineering, Northeast Forestry University, Harbin, PR China; Research Center of Wood Intelligent Science, Northeast Forestry University, Harbin, PR China.
Int J Biol Macromol. 2018 Aug;115:185-193. doi: 10.1016/j.ijbiomac.2018.04.012. Epub 2018 Apr 6.
Nitrogen-doped carbon aerogels derived from sodium carboxymethyl cellulose were prepared via a multistep approach involving sol-gel, freeze-drying, carbonization, and KOH activation processes; ferric trichloride and collagen were used as cross-linking agent and nitrogen source, respectively. The carbon aerogels exhibited well-developed porous three-dimensional morphologies, high specific surface areas, and excellent magnetic properties. When applied as electrode material, the CA-N0.5 showed a specific capacitance of 185.3F/g at the current density of 0.5A/g in a 6M KOH electrolyte. The specific capacitance retention was 90.2% after 5000 charge/discharge cycles, indicating excellent cycling stability. In addition, the carbon aerogels showed excellent adsorption capacities of 238.2 and 230.4mg/g for malachite green and methylene blue, respectively. These results suggest that N-doped carbon aerogels may be utilized as electrodes in supercapacitors as well as highly efficient contaminant adsorbents in aqueous solutions.
由羧甲基纤维素钠衍生的氮掺杂碳气凝胶是通过溶胶-凝胶、冷冻干燥、碳化和 KOH 活化等多步过程制备的；三氯化铁和胶原蛋白分别用作交联剂和氮源。碳气凝胶具有发达的多孔三维形态、高比表面积和优异的磁性。将其用作电极材料时，在 6M KOH 电解质中，CA-N0.5 在 0.5A/g 的电流密度下表现出 185.3F/g 的比电容。经过 5000 次充放电循环后，比电容保持率为 90.2%，表现出优异的循环稳定性。此外，碳气凝胶对孔雀石绿和亚甲基蓝的吸附容量分别达到 238.2 和 230.4mg/g。这些结果表明，氮掺杂碳气凝胶可用作超级电容器中的电极以及水溶液中高效的污染物吸附剂。
