Fan Xueying, Zhang Wen, Xu Yongsheng, Zheng Jie, Li Yang, Fan Xiaobin, Zhang Fengbao, Ji Junyi, Peng Wenchao
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, P. R. China.
School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China.
J Colloid Interface Sci. 2022 Oct 15;624:51-59. doi: 10.1016/j.jcis.2022.05.128. Epub 2022 May 25.
Tailoring the porous structure of carbon materials is one essential approach to improve the energy storage performance of carbon-based electrode materials. Herein, hierarchical porous carbons (HPCs) with different meso-structure are synthesized via a one-pot pyrolysis process with SiO and ZnCl as template and activator, respectively. The energy storage capacities of the obtained HPC samples are investigated as bi-functional electrode both for supercapacitor and LIBs. The results show that different meso-structure of HPCs can effectively affect the energy storage performance. In the range of 15 ∼ 50 nm, smaller size of mesopore can result better electrochemical performance of HPCs. And the optimized HPC sample (HPC-15) manifests high specific capacitance of 432F g and good cyclic stability in the supercapacitor application. When used as anode of LIBs, the HPC-15 presents a high capacity of 820 mAh g. In addition, COMSOL simulation is employed to study the effect of pore structure on mass transfer during electrochemical process. The HPC-15 is calculated to have the highest total porosity (ε) and effective diffusivity of K (D = 6.776 × 10 m s), thus leading to its best electrochemical performance.
定制碳材料的多孔结构是提高碳基电极材料储能性能的一种重要方法。在此，分别以SiO和ZnCl作为模板和活化剂，通过一锅热解工艺合成了具有不同介观结构的分级多孔碳（HPC）。研究了所得HPC样品作为超级电容器和锂离子电池双功能电极的储能容量。结果表明，HPC不同的介观结构能有效影响其储能性能。在15至50纳米范围内，较小尺寸的中孔可使HPC具有更好的电化学性能。优化后的HPC样品（HPC-15）在超级电容器应用中表现出432F/g的高比电容和良好的循环稳定性。当用作锂离子电池的负极时，HPC-15具有820 mAh/g的高容量。此外，采用COMSOL模拟研究了孔结构对电化学过程中传质的影响。计算得出HPC-15具有最高的总孔隙率（ε）和K的有效扩散率（D = 6.776×10 m²/s），因此其电化学性能最佳。
