期刊
CHEMICAL SCIENCE
卷 11, 期 29, 页码 7665-7671出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sc01408g
关键词
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资金
- EU Graphene Flagship [785219]
- ERC [852909]
- DFG [426572620]
- Coordination Networks: Building Blocks for Functional Systems [SPP 1928]
- H2020-MSCA-ITN (ULTIMATE) [813036]
- German Science Council
- Center of Advancing Electronics Dresden (cfaed)
- China Scholarship Council
- European Research Council (ERC) [852909] Funding Source: European Research Council (ERC)
Two-dimensional conjugated metal-organic frameworks (2D c-MOFs) have recently emerged for potential applications in (opto-)electronics, chemiresistive sensing, and energy storage and conversion, due to their excellent electrical conductivity, abundant active sites, and intrinsic porous structures. However, developing ultrathin 2D c-MOF nanosheets (NSs) for facile solution processing and integration into devices remains a great challenge, mostly due to unscalable synthesis, low yield, limited lateral size and low crystallinity. Here, we report a surfactant-assisted solution synthesis toward ultrathin 2D c-MOF NSs, including HHB-Cu (HHB = hexahydroxybenzene), HHB-Ni and HHTP-Cu (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene). For the first time, we achieve single-crystalline HHB-Cu(Ni) NSs featured with a thickness of 4-5 nm (similar to 8-10 layers) and a lateral size of 0.25-0.65 mu m(2), as well as single-crystalline HHTP-Cu NSs with a thickness of similar to 5.1 +/- 2.6 nm (similar to 10 layers) and a lateral size of 0.002-0.02 mu m(2). Benefiting from the ultrathin feature, the synthetic NSs allow fast ion diffusion and high utilization of active sites. As a proof of concept, when serving as a cathode material for Li-ion storage, HHB-Cu NSs deliver a remarkable rate capability (charge within 3 min) and long-term cycling stability (90% capacity retention after 1000 cycles), superior to the corresponding bulk materials and other reported MOF cathodes.
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