期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 282, 期 -, 页码 205-210出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2019.03.038
关键词
Hierarchical porous carbons; Hypercrosslinked polystyrene; Ion transport rate; Volumetric capacitance; Supercapacitors
类别
资金
- National Natural Science Foundation of China [51702262, 21603175, 51672225]
- China Postdoctoral Science Foundation [2018T111094, 2018M643734]
- Fundamental Research Funds for the Central Universities [3102017OQD057]
- Key Lab Laboratory of Polymeric Composite & Functional Materials of Ministry of Education [PCFM201602]
- DFG [KA 1698/27-1]
- Alexander von Humboldt Foundation
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.
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