Engineering pore ratio in hierarchical porous carbons towards high-rate and large-volumetric performances
Xu F, Han H, Ding B, Qiu Y, Zhang E, Li H, Kaskel S (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 282
Pages Range: 205-210
DOI: 10.1016/j.micromeso.2019.03.038
Abstract
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.
Involved external institutions
Northwestern Polytechnical University / 西北工业大学 (NPU/NWPU)
China (CN)
Technische Universität Dresden
Germany (DE)
China (CN)
Technische Universität Dresden
Germany (DE)
How to cite
APA:
Xu, F., Han, H., Ding, B., Qiu, Y., Zhang, E., Li, H., & Kaskel, S. (2019). Engineering pore ratio in hierarchical porous carbons towards high-rate and large-volumetric performances. Microporous and Mesoporous Materials, 282, 205-210. https://doi.org/10.1016/j.micromeso.2019.03.038
MLA:
Xu, Fei, et al. "Engineering pore ratio in hierarchical porous carbons towards high-rate and large-volumetric performances." Microporous and Mesoporous Materials 282 (2019): 205-210.
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