Wang Haiyang, Zhou Chuan, Zhu Hongzhe, Li Yixuan, Wang Shoukai, Shen Kaihua
The State Key Laboratory of Fine Chemicals, Dalian University of Technology Dalian 116012 China
Sinosteel Anshan Research Institute of Thermo-energy Company Limited Anshan 114044 China.
RSC Adv. 2020 Jan 7;10(2):1095-1103. doi: 10.1039/c9ra09141f. eCollection 2020 Jan 2.
A gel carbonization strategy for the synthesis of hierarchical porous carbons (HPCs) from carboxylated coal-tar pitches (CCP) functional poly(acrylic acid) (PAA) hydrogel networks for advanced supercapacitor electrodes was reported. The amphiphilic CCP and PAA polymer could be easily self-assembled to gel by the major driving force of hydrogen bonding and π-π stacking. The HPCs containing interconnected macro-/meso-/micropores were fabricated by direct carbonization of the dried hydrogels. The resultant HPCs with a high specific surface area and total pore volume of 1294.6 m g and 1.34 cm g respectively, as a supercapacitor electrode exhibit a high specific capacitance of 292 F g at 1.0 A g in two-electrode system. The electrode also exhibits ultra-long cycle life with a capacitance retention as high as 94.2% after 10 000 cycles, indicating the good electrochemical stability. Furthermore, the concept of such hierarchical architecture and synthesis strategy would expand to other materials for advanced energy storage systems, such as Na-ion batteries and metal oxides for supercapacitors.
报道了一种凝胶碳化策略，用于从羧化煤焦油沥青（CCP）和功能化聚（丙烯酸）（PAA）水凝胶网络合成分级多孔碳（HPC），用于先进的超级电容器电极。两亲性的CCP和PAA聚合物可通过氢键和π-π堆积的主要驱动力轻松自组装成凝胶。通过对干燥水凝胶进行直接碳化制备了含有相互连接的大孔/中孔/微孔的HPC。所得HPC作为超级电容器电极，具有分别为1294.6 m²/g和1.34 cm³/g的高比表面积和总孔体积，在两电极系统中，在1.0 A/g电流密度下展现出292 F/g的高比电容。该电极还具有超长的循环寿命，在10000次循环后电容保持率高达94.2%，表明其具有良好的电化学稳定性。此外，这种分级结构和合成策略的概念将扩展到其他用于先进储能系统的材料，如钠离子电池和超级电容器用金属氧化物。
