Pei Tong, Sun Fei, Gao Jihui, Wang Lijie, Pi Xinxin, Qie Zhipeng, Zhao Guangbo
School of Energy Science and Engineering, Harbin Institute of Technology Harbin 150001 Heilongjiang China
RSC Adv. 2018 Nov 12;8(66):37880-37889. doi: 10.1039/c8ra07308b. eCollection 2018 Nov 7.
Focusing on engineering the pore structure of porous carbons for enhanced supercapacitive performances, a new type of coal derived hierarchically porous carbon which is synthesized by introducing a catalytic gasification mechanism into an often-utilized chemical activation process is demonstrated. Such a strategy skillfully employs the catalytic effects of the minerals in natural coal on the etching reaction between CO molecules and carbon framework, which easily widen the pore size of well-developed micropores, thereby yielding a hierarchical pore configuration with simultaneously high surface area, large pore volume as well as broadened pore size distribution. The enhanced pore development mechanism is elucidated by a series of control experiments and thermogravimetric analysis. Evaluated as supercapacitor electrode materials, the resulting HPC exhibits state-of-the-art supercapacitive performances in both aqueous and non-aqueous electrolytes, particularly the superior rate capabilities, which highlights the favorable role of broadened pore configuration in facilitating electrolyte ion transfer and storage. Combining with the naturally abundant carbon resource and easily-implemented preparation craft, the as-obtained coal transferred hierarchically porous carbons hold great potentials for industrial production and supercapacitor applications.
聚焦于通过工程设计多孔碳的孔隙结构来提升超级电容性能，展示了一种新型的由煤衍生的分级多孔碳，它是通过在常用的化学活化过程中引入催化气化机制合成的。这种策略巧妙地利用了天然煤中矿物质对CO分子与碳骨架之间蚀刻反应的催化作用，这很容易扩大发育良好的微孔的孔径，从而产生具有高比表面积、大孔体积以及宽孔径分布的分级孔隙结构。通过一系列对照实验和热重分析阐明了增强的孔隙发育机制。作为超级电容器电极材料进行评估时，所得的分级多孔碳（HPC）在水性和非水性电解质中均展现出一流的超级电容性能，尤其是卓越的倍率性能，这突出了拓宽的孔隙结构在促进电解质离子转移和存储方面的有利作用。结合天然丰富的碳资源和易于实施的制备工艺，所获得的由煤转化的分级多孔碳在工业生产和超级电容器应用方面具有巨大潜力。
