National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China.
Bioresour Technol. 2013 Dec;149:31-7. doi: 10.1016/j.biortech.2013.09.026. Epub 2013 Sep 14.
Activated carbon hollow fibers (ACHFs) with high surface area were prepared from inexpensive, renewable ramie fibers (RFs) by a single-step activation method under lower temperature than that of other reports. The effects of activation conditions on the pore structure and turbostratic structure of ACHFs were investigated systematically. The results show that ACHFs surface area decreased but micropore volume and conductivity increased as the increase of activation temperature and activation time. The electrochemical measurements of supercapacitors fabricated from these ACHFs electrodes reveal that the electrochemical properties improved with the enhancing of activation degree. However, too high activation temperature can make the ion diffusion resistance increase. It suggests that pore structure and conductivity are as important as surface area to decide the electrochemical performances of ACHFs electrode materials. A maximum capacity of 287 F g(-1) at 50 mA g(-1) was obtained for the ACHFs electrode prepared under suitable conditions.
活性炭中空纤维（ACHFs）具有高比表面积，是由廉价可再生的苎麻纤维（RFs）通过一步法在比其他报道更低的温度下制备而成。系统研究了活化条件对ACHFs 孔结构和乱层石墨结构的影响。结果表明，随着活化温度和时间的增加，ACHFs 的比表面积减小，而微孔体积和电导率增加。由这些 ACHFs 电极制成的超级电容器的电化学测量表明，随着活化程度的提高，电化学性能得到改善。然而，过高的活化温度会使离子扩散阻力增加。这表明，孔结构和电导率与比表面积一样，对决定 ACHFs 电极材料的电化学性能至关重要。在合适的条件下制备的 ACHFs 电极，在 50 mA g(-1)的电流密度下获得了 287 F g(-1)的最大容量。
