Facile regulation of carbon framework from the microporous to low-porous via molecular crosslinker design and enhanced Na storage
Facile regulation of carbon framework from the microporous to low-porous via molecular crosslinker design and enhanced Na storage
复制标题
通过分子交联剂设计和增强的钠储存轻松调节碳骨架从微孔到低孔
DOI:
10.1016/j.carbon.2020.05.081
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发表时间:
2020-10
期刊:
影响因子:
10.9
通讯作者:
Stefan Kaskel
中科院分区:
文献类型:
--
作者:
Fei Xu;Haojie Han;Yuqian Qiu;En Zhang;Hlib Repich;Changzhen Qu;Huiwu Yu;Hongqiang Wang;Stefan Kaskel
Rational manipulation of the carbon framework from the microporous to nonporous via a molecular design approach is interesting but challenging. Herein, we report a versatile strategy for transforming the microporous carbon framework to the low porous one by an elaborate molecular crosslinker design in the polystyrene (PS) precursor. Direct coupling of benzene rings in PS via Scholl reaction yields hypercrosslinked PS-derived carbon with low porous framework, while insertion of methylene crosslinker into PS via a solvent knitting strategy leads to microporous carbon framework. The results show that methylene crosslinker functions as molecular-scale soft templates for facilitating micropores, whereas direct linking PS chains promotes aromatization and mitigates micropore formation during the pyrolysis. The distinct carbon frameworks derived from similar precursor and pyrolysis condition provide an intriguing platform for structure-property relationship study, as preliminarily exemplified by the application in Na ion storage. The low-porosity carbon shows higher initial Coulombic efficiency and superior capacity thanks to its low surface area and enhanced Na insertion into pseudo-graphitic microcrystal structure. The present protocol opens up new avenues towards flexible carbon framework porosity manipulation at molecular level and would trigger further efforts for low-porosity carbons in energy storage.
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影响因子:
29.4
作者:
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通讯作者:
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影响因子:
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DOI:
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