Fabrication of three-dimensional microtubular kapok fiber carbon aerogel/RuO2 composites for supercapacitors
Fabrication of three-dimensional microtubular kapok fiber carbon aerogel/RuO2 composites for supercapacitors
复制标题
超级电容器用三维微管木棉纤维碳气凝胶/RuO2复合材料的制备
DOI：
10.1016/j.electacta.2019.01.095
复制
发表时间：
2019-03-20
影响因子：
6.6
通讯作者：
Liu, Shouxin
中科院分区：
文献类型：
--
作者：
Sun, Jiaming;E, Lei;Liu, Shouxin
以可再生天然木棉纤维为原料，采用NaClO2预处理、CO2活化和RuO2纳米粒子负载相结合的方法，制备了含三维微管的碳气凝胶/RuO2复合材料。通过调整碳化温度，优化了材料的电化学性能。800℃焙烧2 h，CO2活化30 min的复合材料具有完整的管状结构和中等的孔径分布。在3M KOH溶液中，当电流密度为1Ag(-1)时，该复合材料的比电容为433Fg(-1)，循环2000次，容量保持率为91.5%。在对称装置中，当电池电压为1V时，在3.0M KOH水溶液中，当电池电压为1V时，最大能量密度为8.92Wh·kg(-1)、558.12 wk·kg(-1)。我们将所获得的生物衍生碳气凝胶/RuO2复合材料的可逆容量归因于独特的中空管状结构中电解液的高速流动、合适的孔径分布以及RuO2的高容量和炭材料的良好稳定性的协同作用。(C)2019爱思唯尔有限公司。保留所有权利。
We prepared carbon aerogel/RuO2 composites with three-dimensional microtubes based on renewable natural kapok fibers by combining a NaClO2 pretreatment, CO2 activation and loading of RuO2 nano-particles. The electrochemical performance of the material was optimized by tuning the carbonization temperature. The composite calcined at 800 degrees C for 2 h and activated by CO2 for 30 min possessed an integrated tubular structure and moderate pore size distribution. This composite material also showed highest specific capacitance of 433 F g(-1) at a current density of 1 A g(-1) with a capacitance retention of 91.5% for 2000 cycles in 3M KOH solution in three-electrode system. The maximum energy density was 8.92 Wh kg(-1) at 558.12 Wkg(-1) at a cell voltage of 1 V in 3.0M KOH aqueous electrolyte in a symmetric device. We attribute the reversible capacity of the obtained bio-derived carbon aerogel/RuO2 composites to the high-speed flow of the electrolyte in the unique hollow tubular structure, the appropriate pore size distribution and the synergetic effect of the high capacitance of RuO2 and good stability of the carbon material. (C) 2019 Elsevier Ltd. All rights reserved.