Engineering pore ratio in hierarchical porous carbons towards high-rate and large-volumetric performances.

Hierarchical yet densely packed porous carbon electrodes are vital for achieving high-performance capacitive energy storage. However, hierarchical porous carbons (HPCs) suffer from a trade-off in terms of meso- and macroporosity ratio related to the pore size dependent diffusive ion mobility versus the material density dominating the volumetric performance. Here we report an interesting insight into a balanced effect of meso- and macroporosity ratio and the material density with a practical high mass loading by designing HPCs with controlled meso- and macroporosity ratio. This is achieved via a hypercrosslinking strategy of polystyrene without the assistant of any templates or activation. It is found that ion transport rates increase along with increasing the meso- and macropore content to 26% and then gradually level off even further increasing the amount to 73%. An appropriate meso- and macropore content without sacrificing the ion diffusivity is beneficial for achieving effective material densities up to 0.76 g cm−3, leading to superior volumetric capacitances, as compared with those showing either lower or higher meso- and macropore content. This study clearly highlights the need for fine-tuning the pore ratios at different scales in hierarchical structures to achieve high-performance applications for practical applications. Image 1 Well-balanced pore hierarchy ratio is engineered in hierarchical porous carbons to achieve simultaneously high rate and large volumetric performances in supercapacitors. • Hierarchical porous carbons with controlled meso- and macroporosity content are prepared via a hypercrossliking strategy. • Ion transport rates increase along with increasing the meso- and macropore content to 26% and then gradually level off. • Well-balanced pore hierarchy and material density is clarified for achieving high rate and large volumetric performances. [ABSTRACT FROM AUTHOR]