Ionic Covalent Organic Frameworks with Spiroborate Linkage

被引:575
作者
Du, Ya [1 ]
Yang, Haishen [1 ]
Whiteley, Justin Michael [2 ]
Wan, Shun [3 ]
Jin, Yinghua [1 ]
Lee, Se-Hee [2 ]
Zhang, Wei [1 ]
机构
[1] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA
[2] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA
[3] Storagenergy Technol Inc, Salt Lake City, UT 84120 USA
基金
美国国家科学基金会;
关键词
covalent organic frameworks; gas adsorption; ionic polymers; lithium-ion conductivity; spiroborates; BORON COMPLEX; TWIN BOWLS; B-11; NMR; LITHIUM; STABILITY; CRYSTALLINE; POLYMERS; ESTERS; BORATE; ELECTROLYTES;
D O I
10.1002/anie.201509014
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel type of ionic covalent organic framework (ICOF), which contains sp(3) hybridized boron anionic centers and tunable countercations, was constructed by formation of spiroborate linkages. These ICOFs exhibit high BET surface areas up to 1259 m(2) g(-1) and adsorb a significant amount of H-2 (up to 3.11 wt%, 77 K, 1 bar) and CH4 (up to 4.62 wt%, 273 K, 1 bar). Importantly, the materials show good thermal stabilities and excellent resistance to hydrolysis, remaining nearly intact when immersed in water or basic solution for two days. The presence of permanently immobilized ion centers in ICOFs enables the transportation of lithium ions with room-temperature lithium-ion conductivity of 3.05 x 10(-5) S cm(-1) and an average Li+ transference number value of 0.80 +/- 0.02. Our approach thus provides a convenient route to highly stable COFs with ionic linkages, which can potentially serve as absorbents for alternative energy sources such as H-2, CH4, and also as solid lithium electrolytes/separators for the next-generation lithium batteries.
引用
收藏
页码:1737 / 1741
页数:5
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